Nonsusceptibility to the invasive or pathogenic effects of foreign microorganisms or to the toxic effect of antigenic substances.
The capacity of a normal organism to remain unaffected by microorganisms and their toxins. It results from the presence of naturally occurring ANTI-INFECTIVE AGENTS, constitutional factors such as BODY TEMPERATURE and immediate acting immune cells such as NATURAL KILLER CELLS.
Manifestations of the immune response which are mediated by antigen-sensitized T-lymphocytes via lymphokines or direct cytotoxicity. This takes place in the absence of circulating antibody or where antibody plays a subordinate role.
Protection from an infectious disease agent that is mediated by B- and T- LYMPHOCYTES following exposure to specific antigen, and characterized by IMMUNOLOGIC MEMORY. It can result from either previous infection with that agent or vaccination (IMMUNITY, ACTIVE), or transfer of antibody or lymphocytes from an immune donor (IMMUNIZATION, PASSIVE).
Nonsusceptibility to the pathogenic effects of foreign microorganisms or antigenic substances as a result of antibody secretions of the mucous membranes. Mucosal epithelia in the gastrointestinal, respiratory, and reproductive tracts produce a form of IgA (IMMUNOGLOBULIN A, SECRETORY) that serves to protect these ports of entry into the body.
Antibody-mediated immune response. Humoral immunity is brought about by ANTIBODY FORMATION, resulting from TH2 CELLS activating B-LYMPHOCYTES, followed by COMPLEMENT ACTIVATION.
The inherent or induced capacity of plants to withstand or ward off biological attack by pathogens.
Resistance to a disease-causing agent induced by the introduction of maternal immunity into the fetus by transplacental transfer or into the neonate through colostrum and milk.
The non-susceptibility to infection of a large group of individuals in a population. A variety of factors can be responsible for herd immunity and this gives rise to the different definitions used in the literature. Most commonly, herd immunity refers to the case when, if most of the population is immune, infection of a single individual will not cause an epidemic. Also, in such immunized populations, susceptible individuals are not likely to become infected. Herd immunity can also refer to the case when unprotected individuals fail to contract a disease because the infecting organism has been banished from the population.
Specialized cells of the hematopoietic system that have branch-like extensions. They are found throughout the lymphatic system, and in non-lymphoid tissues such as SKIN and the epithelia of the intestinal, respiratory, and reproductive tracts. They trap and process ANTIGENS, and present them to T-CELLS, thereby stimulating CELL-MEDIATED IMMUNITY. They are different from the non-hematopoietic FOLLICULAR DENDRITIC CELLS, which have a similar morphology and immune system function, but with respect to humoral immunity (ANTIBODY PRODUCTION).
Lymphocytes responsible for cell-mediated immunity. Two types have been identified - cytotoxic (T-LYMPHOCYTES, CYTOTOXIC) and helper T-lymphocytes (T-LYMPHOCYTES, HELPER-INDUCER). They are formed when lymphocytes circulate through the THYMUS GLAND and differentiate to thymocytes. When exposed to an antigen, they divide rapidly and produce large numbers of new T cells sensitized to that antigen.
Administration of vaccines to stimulate the host's immune response. This includes any preparation intended for active immunological prophylaxis.
The major interferon produced by mitogenically or antigenically stimulated LYMPHOCYTES. It is structurally different from TYPE I INTERFERON and its major activity is immunoregulation. It has been implicated in the expression of CLASS II HISTOCOMPATIBILITY ANTIGENS in cells that do not normally produce them, leading to AUTOIMMUNE DISEASES.
A critical subpopulation of regulatory T-lymphocytes involved in MHC Class I-restricted interactions. They include both cytotoxic T-lymphocytes (T-LYMPHOCYTES, CYTOTOXIC) and CD8+ suppressor T-lymphocytes.
The production of ANTIBODIES by proliferating and differentiated B-LYMPHOCYTES under stimulation by ANTIGENS.
Morphologic alteration of small B LYMPHOCYTES or T LYMPHOCYTES in culture into large blast-like cells able to synthesize DNA and RNA and to divide mitotically. It is induced by INTERLEUKINS; MITOGENS such as PHYTOHEMAGGLUTININS, and by specific ANTIGENS. It may also occur in vivo as in GRAFT REJECTION.
Immunoglobulins produced in response to VIRAL ANTIGENS.
A critical subpopulation of T-lymphocytes involved in the induction of most immunological functions. The HIV virus has selective tropism for the T4 cell which expresses the CD4 phenotypic marker, a receptor for HIV. In fact, the key element in the profound immunosuppression seen in HIV infection is the depletion of this subset of T-lymphocytes.
Non-antibody proteins secreted by inflammatory leukocytes and some non-leukocytic cells, that act as intercellular mediators. They differ from classical hormones in that they are produced by a number of tissue or cell types rather than by specialized glands. They generally act locally in a paracrine or autocrine rather than endocrine manner.
An encapsulated lymphatic organ through which venous blood filters.
Substances that augment, stimulate, activate, potentiate, or modulate the immune response at either the cellular or humoral level. The classical agents (Freund's adjuvant, BCG, Corynebacterium parvum, et al.) contain bacterial antigens. Some are endogenous (e.g., histamine, interferon, transfer factor, tuftsin, interleukin-1). Their mode of action is either non-specific, resulting in increased immune responsiveness to a wide variety of antigens, or antigen-specific, i.e., affecting a restricted type of immune response to a narrow group of antigens. The therapeutic efficacy of many biological response modifiers is related to their antigen-specific immunoadjuvanticity.
The major immunoglobulin isotype class in normal human serum. There are several isotype subclasses of IgG, for example, IgG1, IgG2A, and IgG2B.
Strains of mice in which certain GENES of their GENOMES have been disrupted, or "knocked-out". To produce knockouts, using RECOMBINANT DNA technology, the normal DNA sequence of the gene being studied is altered to prevent synthesis of a normal gene product. Cloned cells in which this DNA alteration is successful are then injected into mouse EMBRYOS to produce chimeric mice. The chimeric mice are then bred to yield a strain in which all the cells of the mouse contain the disrupted gene. Knockout mice are used as EXPERIMENTAL ANIMAL MODELS for diseases (DISEASE MODELS, ANIMAL) and to clarify the functions of the genes.
An increased reactivity to specific antigens mediated not by antibodies but by cells.
Recombinant DNA vectors encoding antigens administered for the prevention or treatment of disease. The host cells take up the DNA, express the antigen, and present it to the immune system in a manner similar to that which would occur during natural infection. This induces humoral and cellular immune responses against the encoded antigens. The vector is called naked DNA because there is no need for complex formulations or delivery agents; the plasmid is injected in saline or other buffers.
The altered state of immunologic responsiveness resulting from initial contact with antigen, which enables the individual to produce antibodies more rapidly and in greater quantity in response to secondary antigenic stimulus.
Vaccines or candidate vaccines designed to prevent or treat cancer. Vaccines are produced using the patient's own whole tumor cells as the source of antigens, or using tumor-specific antigens, often recombinantly produced.
Small synthetic peptides that mimic surface antigens of pathogens and are immunogenic, or vaccines manufactured with the aid of recombinant DNA techniques. The latter vaccines may also be whole viruses whose nucleic acids have been modified.
Subset of helper-inducer T-lymphocytes which synthesize and secrete interleukin-2, gamma-interferon, and interleukin-12. Due to their ability to kill antigen-presenting cells and their lymphokine-mediated effector activity, Th1 cells are associated with vigorous delayed-type hypersensitivity reactions.
Immunoglobulins produced in a response to BACTERIAL ANTIGENS.
Suspensions of attenuated or killed viruses administered for the prevention or treatment of infectious viral disease.
Immunized T-lymphocytes which can directly destroy appropriate target cells. These cytotoxic lymphocytes may be generated in vitro in mixed lymphocyte cultures (MLC), in vivo during a graft-versus-host (GVH) reaction, or after immunization with an allograft, tumor cell or virally transformed or chemically modified target cell. The lytic phenomenon is sometimes referred to as cell-mediated lympholysis (CML). These CD8-positive cells are distinct from NATURAL KILLER CELLS and NATURAL KILLER T-CELLS. There are two effector phenotypes: TC1 and TC2.
A large family of cell surface receptors that bind conserved molecular structures (PAMPS) present in pathogens. They play important roles in host defense by mediating cellular responses to pathogens.
Live vaccines prepared from microorganisms which have undergone physical adaptation (e.g., by radiation or temperature conditioning) or serial passage in laboratory animal hosts or infected tissue/cell cultures, in order to produce avirulent mutant strains capable of inducing protective immunity.
A family of pattern recognition receptors characterized by an extracellular leucine-rich domain and a cytoplasmic domain that share homology with the INTERLEUKIN 1 RECEPTOR and the DROSOPHILA toll protein. Following pathogen recognition, toll-like receptors recruit and activate a variety of SIGNAL TRANSDUCING ADAPTOR PROTEINS.
Any immunization following a primary immunization and involving exposure to the same or a closely related antigen.
Suspensions of killed or attenuated microorganisms (bacteria, viruses, fungi, protozoa), antigenic proteins, synthetic constructs, or other bio-molecular derivatives, administered for the prevention, amelioration, or treatment of infectious and other diseases.
Theoretical representations that simulate the behavior or activity of immune system, processes, or phenomena. They include the use of mathematical equations, computers, and other electrical equipment.
Delivery of medications through the nasal mucosa.
The relatively long-lived phagocytic cell of mammalian tissues that are derived from blood MONOCYTES. Main types are PERITONEAL MACROPHAGES; ALVEOLAR MACROPHAGES; HISTIOCYTES; KUPFFER CELLS of the liver; and OSTEOCLASTS. They may further differentiate within chronic inflammatory lesions to EPITHELIOID CELLS or may fuse to form FOREIGN BODY GIANT CELLS or LANGHANS GIANT CELLS. (from The Dictionary of Cell Biology, Lackie and Dow, 3rd ed.)
A heterodimeric cytokine that plays a role in innate and adaptive immune responses. Interleukin-12 is a 70 kDa protein that is composed of covalently linked 40 kDa and 35 kDa subunits. It is produced by DENDRITIC CELLS; MACROPHAGES and a variety of other immune cells and plays a role in the stimulation of INTERFERON-GAMMA production by T-LYMPHOCYTES and NATURAL KILLER CELLS.
The specific failure of a normally responsive individual to make an immune response to a known antigen. It results from previous contact with the antigen by an immunologically immature individual (fetus or neonate) or by an adult exposed to extreme high-dose or low-dose antigen, or by exposure to radiation, antimetabolites, antilymphocytic serum, etc.
The body's defense mechanism against foreign organisms or substances and deviant native cells. It includes the humoral immune response and the cell-mediated response and consists of a complex of interrelated cellular, molecular, and genetic components.
Bone marrow-derived lymphocytes that possess cytotoxic properties, classically directed against transformed and virus-infected cells. Unlike T CELLS; and B CELLS; NK CELLS are not antigen specific. The cytotoxicity of natural killer cells is determined by the collective signaling of an array of inhibitory and stimulatory CELL SURFACE RECEPTORS. A subset of T-LYMPHOCYTES referred to as NATURAL KILLER T CELLS shares some of the properties of this cell type.
Substances elaborated by bacteria that have antigenic activity.
The interactions between a host and a pathogen, usually resulting in disease.
Descriptions of specific amino acid, carbohydrate, or nucleotide sequences which have appeared in the published literature and/or are deposited in and maintained by databanks such as GENBANK, European Molecular Biology Laboratory (EMBL), National Biomedical Research Foundation (NBRF), or other sequence repositories.
The intracellular transfer of information (biological activation/inhibition) through a signal pathway. In each signal transduction system, an activation/inhibition signal from a biologically active molecule (hormone, neurotransmitter) is mediated via the coupling of a receptor/enzyme to a second messenger system or to an ion channel. Signal transduction plays an important role in activating cellular functions, cell differentiation, and cell proliferation. Examples of signal transduction systems are the GAMMA-AMINOBUTYRIC ACID-postsynaptic receptor-calcium ion channel system, the receptor-mediated T-cell activation pathway, and the receptor-mediated activation of phospholipases. Those coupled to membrane depolarization or intracellular release of calcium include the receptor-mediated activation of cytotoxic functions in granulocytes and the synaptic potentiation of protein kinase activation. Some signal transduction pathways may be part of larger signal transduction pathways; for example, protein kinase activation is part of the platelet activation signal pathway.
Infections with bacteria of the genus LISTERIA.
An immunoassay utilizing an antibody labeled with an enzyme marker such as horseradish peroxidase. While either the enzyme or the antibody is bound to an immunosorbent substrate, they both retain their biologic activity; the change in enzyme activity as a result of the enzyme-antibody-antigen reaction is proportional to the concentration of the antigen and can be measured spectrophotometrically or with the naked eye. Many variations of the method have been developed.
Substances elaborated by specific strains of bacteria that are lethal against other strains of the same or related species. They are protein or lipopolysaccharide-protein complexes used in taxonomy studies of bacteria.
Cells propagated in vitro in special media conducive to their growth. Cultured cells are used to study developmental, morphologic, metabolic, physiologic, and genetic processes, among others.
Represents 15-20% of the human serum immunoglobulins, mostly as the 4-chain polymer in humans or dimer in other mammals. Secretory IgA (IMMUNOGLOBULIN A, SECRETORY) is the main immunoglobulin in secretions.
Manipulation of the host's immune system in treatment of disease. It includes both active and passive immunization as well as immunosuppressive therapy to prevent graft rejection.
Naturally occurring or experimentally induced animal diseases with pathological processes sufficiently similar to those of human diseases. They are used as study models for human diseases.
Lymphoid cells concerned with humoral immunity. They are short-lived cells resembling bursa-derived lymphocytes of birds in their production of immunoglobulin upon appropriate stimulation.
A classification of T-lymphocytes, especially into helper/inducer, suppressor/effector, and cytotoxic subsets, based on structurally or functionally different populations of cells.
The phenomenon of target cell destruction by immunologically active effector cells. It may be brought about directly by sensitized T-lymphocytes or by lymphoid or myeloid "killer" cells, or it may be mediated by cytotoxic antibody, cytotoxic factor released by lymphoid cells, or complement.
Technique using an instrument system for making, processing, and displaying one or more measurements on individual cells obtained from a cell suspension. Cells are usually stained with one or more fluorescent dyes specific to cell components of interest, e.g., DNA, and fluorescence of each cell is measured as it rapidly transverses the excitation beam (laser or mercury arc lamp). Fluorescence provides a quantitative measure of various biochemical and biophysical properties of the cell, as well as a basis for cell sorting. Other measurable optical parameters include light absorption and light scattering, the latter being applicable to the measurement of cell size, shape, density, granularity, and stain uptake.
Subset of helper-inducer T-lymphocytes which synthesize and secrete the interleukins IL-4, IL-5, IL-6, and IL-10. These cytokines influence B-cell development and antibody production as well as augmenting humoral responses.
White blood cells formed in the body's lymphoid tissue. The nucleus is round or ovoid with coarse, irregularly clumped chromatin while the cytoplasm is typically pale blue with azurophilic (if any) granules. Most lymphocytes can be classified as either T or B (with subpopulations of each), or NATURAL KILLER CELLS.
The process by which antigen is presented to lymphocytes in a form they can recognize. This is performed by antigen presenting cells (APCs). Some antigens require processing before they can be recognized. Antigen processing consists of ingestion and partial digestion of the antigen by the APC, followed by presentation of fragments on the cell surface. (From Rosen et al., Dictionary of Immunology, 1989)
Proteins, glycoprotein, or lipoprotein moieties on surfaces of tumor cells that are usually identified by monoclonal antibodies. Many of these are of either embryonic or viral origin.
Virus diseases caused by the ORTHOMYXOVIRIDAE.
DNA molecules capable of autonomous replication within a host cell and into which other DNA sequences can be inserted and thus amplified. Many are derived from PLASMIDS; BACTERIOPHAGES; or VIRUSES. They are used for transporting foreign genes into recipient cells. Genetic vectors possess a functional replicator site and contain GENETIC MARKERS to facilitate their selective recognition.
Antigenic determinants recognized and bound by the T-cell receptor. Epitopes recognized by the T-cell receptor are often located in the inner, unexposed side of the antigen, and become accessible to the T-cell receptors after proteolytic processing of the antigen.
A general term for diseases produced by viruses.
Either of the pair of organs occupying the cavity of the thorax that effect the aeration of the blood.
Antibodies that reduce or abolish some biological activity of a soluble antigen or infectious agent, usually a virus.
The order of amino acids as they occur in a polypeptide chain. This is referred to as the primary structure of proteins. It is of fundamental importance in determining PROTEIN CONFORMATION.
Experimentally induced tumor that produces MELANIN in animals to provide a model for studying human MELANOMA.
Suspensions of attenuated or killed protozoa administered for the prevention or treatment of infectious protozoan disease.
A species of gram-positive, rod-shaped bacteria widely distributed in nature. It has been isolated from sewage, soil, silage, and from feces of healthy animals and man. Infection with this bacterium leads to encephalitis, meningitis, endocarditis, and abortion.
Form of passive immunization where previously sensitized immunologic agents (cells or serum) are transferred to non-immune recipients. When transfer of cells is used as a therapy for the treatment of neoplasms, it is called adoptive immunotherapy (IMMUNOTHERAPY, ADOPTIVE).
Immunoglobulins produced in a response to PROTOZOAN ANTIGENS.
Any part or derivative of any protozoan that elicits immunity; malaria (Plasmodium) and trypanosome antigens are presently the most frequently encountered.
A pathological process characterized by injury or destruction of tissues caused by a variety of cytologic and chemical reactions. It is usually manifested by typical signs of pain, heat, redness, swelling, and loss of function.
Laboratory mice that have been produced from a genetically manipulated EGG or EMBRYO, MAMMALIAN.
Substances that are recognized by the immune system and induce an immune reaction.
The measurement of infection-blocking titer of ANTISERA by testing a series of dilutions for a given virus-antiserum interaction end-point, which is generally the dilution at which tissue cultures inoculated with the serum-virus mixtures demonstrate cytopathology (CPE) or the dilution at which 50% of test animals injected with serum-virus mixtures show infectivity (ID50) or die (LD50).
Protection conferred on a host by inoculation with one strain or component of a microorganism that prevents infection when later challenged with a similar strain. Most commonly the microorganism is a virus.
The principle immunoglobulin in exocrine secretions such as milk, respiratory and intestinal mucin, saliva and tears. The complete molecule (around 400 kD) is composed of two four-chain units of IMMUNOGLOBULIN A, one SECRETORY COMPONENT and one J chain (IMMUNOGLOBULIN J-CHAINS).
A protozoan disease caused in humans by four species of the PLASMODIUM genus: PLASMODIUM FALCIPARUM; PLASMODIUM VIVAX; PLASMODIUM OVALE; and PLASMODIUM MALARIAE; and transmitted by the bite of an infected female mosquito of the genus ANOPHELES. Malaria is endemic in parts of Asia, Africa, Central and South America, Oceania, and certain Caribbean islands. It is characterized by extreme exhaustion associated with paroxysms of high FEVER; SWEATING; shaking CHILLS; and ANEMIA. Malaria in ANIMALS is caused by other species of plasmodia.
Serological reactions in which an antiserum against one antigen reacts with a non-identical but closely related antigen.
Phenomenon of cell-mediated immunity measured by in vitro inhibition of the migration or phagocytosis of antigen-stimulated LEUKOCYTES or MACROPHAGES. Specific CELL MIGRATION ASSAYS have been developed to estimate levels of migration inhibitory factors, immune reactivity against tumor-associated antigens, and immunosuppressive effects of infectious microorganisms.
CD4-positive T cells that inhibit immunopathology or autoimmune disease in vivo. They inhibit the immune response by influencing the activity of other cell types. Regulatory T-cells include naturally occurring CD4+CD25+ cells, IL-10 secreting Tr1 cells, and Th3 cells.
Form of adoptive transfer where cells with antitumor activity are transferred to the tumor-bearing host in order to mediate tumor regression. The lymphoid cells commonly used are lymphokine-activated killer (LAK) cells and tumor-infiltrating lymphocytes (TIL). This is usually considered a form of passive immunotherapy. (From DeVita, et al., Cancer, 1993, pp.305-7, 314)
Elements of limited time intervals, contributing to particular results or situations.
Bacteriocins elaborated by strains of Escherichia coli and related species. They are proteins or protein-lipopolysaccharide complexes lethal to other strains of the same species.
Proteins found in any species of bacterium.
Vaccines consisting of one or more antigens that stimulate a strong immune response. They are purified from microorganisms or produced by recombinant DNA techniques, or they can be chemically synthesized peptides.
Experimentally induced new abnormal growth of TISSUES in animals to provide models for studying human neoplasms.
Subpopulation of CD4+ lymphocytes that cooperate with other lymphocytes (either T or B) to initiate a variety of immune functions. For example, helper-inducer T-cells cooperate with B-cells to produce antibodies to thymus-dependent antigens and with other subpopulations of T-cells to initiate a variety of cell-mediated immune functions.
Sites on an antigen that interact with specific antibodies.
Glycoproteins found on the membrane or surface of cells.
Vaccines used to prevent infection by viruses in the family ORTHOMYXOVIRIDAE. It includes both killed and attenuated vaccines. The composition of the vaccines is changed each year in response to antigenic shifts and changes in prevalence of influenza virus strains. The vaccine is usually bivalent or trivalent, containing one or two INFLUENZAVIRUS A strains and one INFLUENZAVIRUS B strain.
Substances elaborated by viruses that have antigenic activity.
A constitution or condition of the body which makes the tissues react in special ways to certain extrinsic stimuli and thus tends to make the individual more than usually susceptible to certain diseases.
A species of gram-negative, fluorescent, phytopathogenic bacteria in the genus PSEUDOMONAS. It is differentiated into approximately 50 pathovars with different plant pathogenicities and host specificities.
Established cell cultures that have the potential to propagate indefinitely.
Vaccines in which the infectious microbial nucleic acid components have been destroyed by chemical or physical treatment (e.g., formalin, beta-propiolactone, gamma radiation) without affecting the antigenicity or immunogenicity of the viral coat or bacterial outer membrane proteins.
A specific immune response elicited by a specific dose of an immunologically active substance or cell in an organism, tissue, or cell.
Methods used by pathogenic organisms to evade a host's immune system.
An active immunizing agent and a viable avirulent attenuated strain of Mycobacterium tuberculosis, var. bovis, which confers immunity to mycobacterial infections. It is used also in immunotherapy of neoplasms due to its stimulation of antibodies and non-specific immunity.
An albumin obtained from the white of eggs. It is a member of the serpin superfamily.
Vaccines made from antigens arising from any of the four strains of Plasmodium which cause malaria in humans, or from P. berghei which causes malaria in rodents.
A soluble factor produced by activated T-LYMPHOCYTES that induces the expression of MHC CLASS II GENES and FC RECEPTORS on B-LYMPHOCYTES and causes their proliferation and differentiation. It also acts on T-lymphocytes, MAST CELLS, and several other hematopoietic lineage cells.
A cytokine produced by a variety of cell types, including T-LYMPHOCYTES; MONOCYTES; DENDRITIC CELLS; and EPITHELIAL CELLS that exerts a variety of effects on immunoregulation and INFLAMMATION. Interleukin-10 combines with itself to form a homodimeric molecule that is the biologically active form of the protein.
Vaccines or candidate vaccines containing inactivated HIV or some of its component antigens and designed to prevent or treat AIDS. Some vaccines containing antigens are recombinantly produced.
The capacity of an organism to defend itself against pathological processes or the agents of those processes. This most often involves innate immunity whereby the organism responds to pathogens in a generic way. The term disease resistance is used most frequently when referring to plants.
A heterogeneous group of immunocompetent cells that mediate the cellular immune response by processing and presenting antigens to the T-cells. Traditional antigen-presenting cells include MACROPHAGES; DENDRITIC CELLS; LANGERHANS CELLS; and B-LYMPHOCYTES. FOLLICULAR DENDRITIC CELLS are not traditional antigen-presenting cells, but because they hold antigen on their cell surface in the form of IMMUNE COMPLEXES for B-cell recognition they are considered so by some authors.
A pattern recognition receptor that interacts with LYMPHOCYTE ANTIGEN 96 and LIPOPOLYSACCHARIDES. It mediates cellular responses to GRAM-NEGATIVE BACTERIA.
A family of non-enveloped viruses infecting mammals (MASTADENOVIRUS) and birds (AVIADENOVIRUS) or both (ATADENOVIRUS). Infections may be asymptomatic or result in a variety of diseases.
The type species of ORTHOPOXVIRUS, related to COWPOX VIRUS, but whose true origin is unknown. It has been used as a live vaccine against SMALLPOX. It is also used as a vector for inserting foreign DNA into animals. Rabbitpox virus is a subspecies of VACCINIA VIRUS.
Experimental transplantation of neoplasms in laboratory animals for research purposes.
The engulfing and degradation of microorganisms; other cells that are dead, dying, or pathogenic; and foreign particles by phagocytic cells (PHAGOCYTES).
The relationship between an invertebrate and another organism (the host), one of which lives at the expense of the other. Traditionally excluded from definition of parasites are pathogenic BACTERIA; FUNGI; VIRUSES; and PLANTS; though they may live parasitically.
Genetically identical individuals developed from brother and sister matings which have been carried out for twenty or more generations, or by parent x offspring matings carried out with certain restrictions. All animals within an inbred strain trace back to a common ancestor in the twentieth generation.
The demonstration of the cytotoxic effect on a target cell of a lymphocyte, a mediator released by a sensitized lymphocyte, an antibody, or complement.
A species of gram-positive, aerobic bacteria that produces TUBERCULOSIS in humans, other primates, CATTLE; DOGS; and some other animals which have contact with humans. Growth tends to be in serpentine, cordlike masses in which the bacilli show a parallel orientation.
Differentiation antigens residing on mammalian leukocytes. CD stands for cluster of differentiation, which refers to groups of monoclonal antibodies that show similar reactivity with certain subpopulations of antigens of a particular lineage or differentiation stage. The subpopulations of antigens are also known by the same CD designation.
Immunosuppression by reduction of circulating lymphocytes or by T-cell depletion of bone marrow. The former may be accomplished in vivo by thoracic duct drainage or administration of antilymphocyte serum. The latter is performed ex vivo on bone marrow before its transplantation.
An intracellular signaling adaptor protein that plays a role in TOLL-LIKE RECEPTOR and INTERLEUKIN 1 RECEPTORS signal transduction. It forms a signaling complex with the activated cell surface receptors and members of the IRAK KINASES.
A soluble substance elaborated by antigen- or mitogen-stimulated T-LYMPHOCYTES which induces DNA synthesis in naive lymphocytes.
Lipid-containing polysaccharides which are endotoxins and important group-specific antigens. They are often derived from the cell wall of gram-negative bacteria and induce immunoglobulin secretion. The lipopolysaccharide molecule consists of three parts: LIPID A, core polysaccharide, and O-specific chains (O ANTIGENS). When derived from Escherichia coli, lipopolysaccharides serve as polyclonal B-cell mitogens commonly used in laboratory immunology. (From Dorland, 28th ed)
Active immunization where vaccine is administered for therapeutic or preventive purposes. This can include administration of immunopotentiating agents such as BCG vaccine and Corynebacterium parvum as well as biological response modifiers such as interferons, interleukins, and colony-stimulating factors in order to directly stimulate the immune system.
Mature LYMPHOCYTES and MONOCYTES transported by the blood to the body's extravascular space. They are morphologically distinguishable from mature granulocytic leukocytes by their large, non-lobed nuclei and lack of coarse, heavily stained cytoplasmic granules.
Minute infectious agents whose genomes are composed of DNA or RNA, but not both. They are characterized by a lack of independent metabolism and the inability to replicate outside living host cells.
A class of immunoglobulin bearing mu chains (IMMUNOGLOBULIN MU-CHAINS). IgM can fix COMPLEMENT. The name comes from its high molecular weight and originally being called a macroglobulin.
Diseases of plants.
Any of the processes by which nuclear, cytoplasmic, or intercellular factors influence the differential control (induction or repression) of gene action at the level of transcription or translation.
An EPITHELIUM with MUCUS-secreting cells, such as GOBLET CELLS. It forms the lining of many body cavities, such as the DIGESTIVE TRACT, the RESPIRATORY TRACT, and the reproductive tract. Mucosa, rich in blood and lymph vessels, comprises an inner epithelium, a middle layer (lamina propria) of loose CONNECTIVE TISSUE, and an outer layer (muscularis mucosae) of SMOOTH MUSCLE CELLS that separates the mucosa from submucosa.
A highly contagious infectious disease caused by MORBILLIVIRUS, common among children but also seen in the nonimmune of any age, in which the virus enters the respiratory tract via droplet nuclei and multiplies in the epithelial cells, spreading throughout the MONONUCLEAR PHAGOCYTE SYSTEM.
An acute, highly contagious, often fatal infectious disease caused by an orthopoxvirus characterized by a biphasic febrile course and distinctive progressive skin eruptions. Vaccination has succeeded in eradicating smallpox worldwide. (Dorland, 28th ed)
Soluble factors which stimulate growth-related activities of leukocytes as well as other cell types. They enhance cell proliferation and differentiation, DNA synthesis, secretion of other biologically active molecules and responses to immune and inflammatory stimuli.
The property of antibodies which enables them to react with some ANTIGENIC DETERMINANTS and not with others. Specificity is dependent on chemical composition, physical forces, and molecular structure at the binding site.
A pattern recognition receptor that forms heterodimers with other TOLL-LIKE RECEPTORS. It interacts with multiple ligands including PEPTIDOGLYCAN, bacterial LIPOPROTEINS, lipoarabinomannan, and a variety of PORINS.
Deliberate prevention or diminution of the host's immune response. It may be nonspecific as in the administration of immunosuppressive agents (drugs or radiation) or by lymphocyte depletion or may be specific as in desensitization or the simultaneous administration of antigen and immunosuppressive drugs.
New abnormal growth of tissue. Malignant neoplasms show a greater degree of anaplasia and have the properties of invasion and metastasis, compared to benign neoplasms.
Antibodies produced by a single clone of cells.
A proinflammatory cytokine produced primarily by T-LYMPHOCYTES or their precursors. Several subtypes of interleukin-17 have been identified, each of which is a product of a unique gene.
The bovine variety of the tubercle bacillus. It is called also Mycobacterium tuberculosis var. bovis.
Immunoglobulin molecules having a specific amino acid sequence by virtue of which they interact only with the ANTIGEN (or a very similar shape) that induced their synthesis in cells of the lymphoid series (especially PLASMA CELLS).
Serum glycoprotein produced by activated MACROPHAGES and other mammalian MONONUCLEAR LEUKOCYTES. It has necrotizing activity against tumor cell lines and increases ability to reject tumor transplants. Also known as TNF-alpha, it is only 30% homologous to TNF-beta (LYMPHOTOXIN), but they share TNF RECEPTORS.
Forceful administration into a muscle of liquid medication, nutrient, or other fluid through a hollow needle piercing the muscle and any tissue covering it.
A species of PLASMODIUM causing malaria in rodents.
Aluminum metal sulfate compounds used medically as astringents and for many industrial purposes. They are used in veterinary medicine for the treatment of ulcerative stomatitis, leukorrhea, conjunctivitis, pharyngitis, metritis, and minor wounds.
A disease caused by tetanospasmin, a powerful protein toxin produced by CLOSTRIDIUM TETANI. Tetanus usually occurs after an acute injury, such as a puncture wound or laceration. Generalized tetanus, the most common form, is characterized by tetanic muscular contractions and hyperreflexia. Localized tetanus presents itself as a mild condition with manifestations restricted to muscles near the wound. It may progress to the generalized form.
Suspensions of attenuated or killed fungi administered for the prevention or treatment of infectious fungal disease.
The degree of pathogenicity within a group or species of microorganisms or viruses as indicated by case fatality rates and/or the ability of the organism to invade the tissues of the host. The pathogenic capacity of an organism is determined by its VIRULENCE FACTORS.
Specialized tissues that are components of the lymphatic system. They provide fixed locations within the body where a variety of LYMPHOCYTES can form, mature and multiply. The lymphoid tissues are connected by a network of LYMPHATIC VESSELS.
Process whereby the immune system reacts against the body's own tissues. Autoimmunity may produce or be caused by AUTOIMMUNE DISEASES.
A costimulatory ligand expressed by ANTIGEN-PRESENTING CELLS that binds to CTLA-4 ANTIGEN with high specificity and to CD28 ANTIGEN with low specificity. The interaction of CD80 with CD28 ANTIGEN provides a costimulatory signal to T-LYMPHOCYTES, while its interaction with CTLA-4 ANTIGEN may play a role in inducing PERIPHERAL TOLERANCE.
A genus of protozoan parasites of the subclass COCCIDIA. Various species are parasitic in the epithelial cells of the liver and intestines of man and other animals.
Class I-restricted activation of CD8-POSITIVE LYMPHOCYTES resulting from ANTIGEN PRESENTATION of exogenous ANTIGENS (cross-presentation). This is in contrast to normal activation of these lymphocytes (direct-priming) which results from presentation of endogenous antigens.
Serum that contains antibodies. It is obtained from an animal that has been immunized either by ANTIGEN injection or infection with microorganisms containing the antigen.
Immunoglobulins produced in a response to HELMINTH ANTIGENS.
Multi-subunit proteins which function in IMMUNITY. They are produced by B LYMPHOCYTES from the IMMUNOGLOBULIN GENES. They are comprised of two heavy (IMMUNOGLOBULIN HEAVY CHAINS) and two light chains (IMMUNOGLOBULIN LIGHT CHAINS) with additional ancillary polypeptide chains depending on their isoforms. The variety of isoforms include monomeric or polymeric forms, and transmembrane forms (B-CELL ANTIGEN RECEPTORS) or secreted forms (ANTIBODIES). They are divided by the amino acid sequence of their heavy chains into five classes (IMMUNOGLOBULIN A; IMMUNOGLOBULIN D; IMMUNOGLOBULIN E; IMMUNOGLOBULIN G; IMMUNOGLOBULIN M) and various subclasses.
Any of the infectious diseases of man and other animals caused by species of MYCOBACTERIUM.
A species of protozoa that is the causal agent of falciparum malaria (MALARIA, FALCIPARUM). It is most prevalent in the tropics and subtropics.
A class of animal lectins that bind to carbohydrate in a calcium-dependent manner. They share a common carbohydrate-binding domain that is structurally distinct from other classes of lectins.
Epicutaneous or intradermal application of a sensitizer for demonstration of either delayed or immediate hypersensitivity. Used in diagnosis of hypersensitivity or as a test for cellular immunity.
Alteration of the immune system or of an immune response by agents that activate or suppress its function. This can include IMMUNIZATION or administration of immunomodulatory drugs. Immunomodulation can also encompass non-therapeutic alteration of the immune system effected by endogenous or exogenous substances.
A protozoan parasite of rodents transmitted by the mosquito Anopheles dureni.
Extrachromosomal, usually CIRCULAR DNA molecules that are self-replicating and transferable from one organism to another. They are found in a variety of bacterial, archaeal, fungal, algal, and plant species. They are used in GENETIC ENGINEERING as CLONING VECTORS.
The forcing into the skin of liquid medication, nutrient, or other fluid through a hollow needle, piercing the top skin layer.
DEFENSINS found mainly in epithelial cells.
Progressive restriction of the developmental potential and increasing specialization of function that leads to the formation of specialized cells, tissues, and organs.
The sequence of PURINES and PYRIMIDINES in nucleic acids and polynucleotides. It is also called nucleotide sequence.
Proteins found in any species of protozoan.
Forceful administration under the skin of liquid medication, nutrient, or other fluid through a hollow needle piercing the skin.
Invasion of the host organism by microorganisms that can cause pathological conditions or diseases.
Large, phagocytic mononuclear leukocytes produced in the vertebrate BONE MARROW and released into the BLOOD; contain a large, oval or somewhat indented nucleus surrounded by voluminous cytoplasm and numerous organelles.
Proteins prepared by recombinant DNA technology.
Malaria caused by PLASMODIUM FALCIPARUM. This is the severest form of malaria and is associated with the highest levels of parasites in the blood. This disease is characterized by irregularly recurring febrile paroxysms that in extreme cases occur with acute cerebral, renal, or gastrointestinal manifestations.
The type species of the genus INFLUENZAVIRUS A that causes influenza and other diseases in humans and animals. Antigenic variation occurs frequently between strains, allowing classification into subtypes and variants. Transmission is usually by aerosol (human and most non-aquatic hosts) or waterborne (ducks). Infected birds shed the virus in their saliva, nasal secretions, and feces.
Forceful administration into the peritoneal cavity of liquid medication, nutrient, or other fluid through a hollow needle piercing the abdominal wall.
A variation of the PCR technique in which cDNA is made from RNA via reverse transcription. The resultant cDNA is then amplified using standard PCR protocols.
Species of CHLAMYDIA causing pneumonitis in mice and hamsters. These isolates formerly belonged to CHLAMYDIA TRACHOMATIS.
Infections with nematodes of the order STRONGYLIDA.
A parasitic hemoflagellate of the subgenus Leishmania leishmania that infects man and animals and causes cutaneous leishmaniasis (LEISHMANIASIS, CUTANEOUS) of the Old World. Transmission is by Phlebotomus sandflies.
A genus of protozoa that comprise the malaria parasites of mammals. Four species infect humans (although occasional infections with primate malarias may occur). These are PLASMODIUM FALCIPARUM; PLASMODIUM MALARIAE; PLASMODIUM OVALE, and PLASMODIUM VIVAX. Species causing infection in vertebrates other than man include: PLASMODIUM BERGHEI; PLASMODIUM CHABAUDI; P. vinckei, and PLASMODIUM YOELII in rodents; P. brasilianum, PLASMODIUM CYNOMOLGI; and PLASMODIUM KNOWLESI in monkeys; and PLASMODIUM GALLINACEUM in chickens.
Lining of the INTESTINES, consisting of an inner EPITHELIUM, a middle LAMINA PROPRIA, and an outer MUSCULARIS MUCOSAE. In the SMALL INTESTINE, the mucosa is characterized by a series of folds and abundance of absorptive cells (ENTEROCYTES) with MICROVILLI.
Biologically active substances whose activities affect or play a role in the functioning of the immune system.
A live VACCINIA VIRUS vaccine of calf lymph or chick embryo origin, used for immunization against smallpox. It is now recommended only for laboratory workers exposed to smallpox virus. Certain countries continue to vaccinate those in the military service. Complications that result from smallpox vaccination include vaccinia, secondary bacterial infections, and encephalomyelitis. (Dorland, 28th ed)
The ability of lymphoid cells to mount a humoral or cellular immune response when challenged by antigen.
The presence of parasites (especially malarial parasites) in the blood. (Dorland, 27th ed)
A pattern recognition receptor that binds unmethylated CPG CLUSTERS. It mediates cellular responses to bacterial pathogens by distinguishing between self and bacterial DNA.
The ability of tumors to evade destruction by the IMMUNE SYSTEM. Theories concerning possible mechanisms by which this takes place involve both cellular immunity (IMMUNITY, CELLULAR) and humoral immunity (ANTIBODY FORMATION), and also costimulatory pathways related to CD28 antigens (ANTIGENS, CD28) and CD80 antigens (ANTIGENS, CD80).
A respiratory infection caused by BORDETELLA PERTUSSIS and characterized by paroxysmal coughing ending in a prolonged crowing intake of breath.
Process of classifying cells of the immune system based on structural and functional differences. The process is commonly used to analyze and sort T-lymphocytes into subsets based on CD antigens by the technique of flow cytometry.
A suspension of killed Bordetella pertussis organisms, used for immunization against pertussis (WHOOPING COUGH). It is generally used in a mixture with diphtheria and tetanus toxoids (DTP). There is an acellular pertussis vaccine prepared from the purified antigenic components of Bordetella pertussis, which causes fewer adverse reactions than whole-cell vaccine and, like the whole-cell vaccine, is generally used in a mixture with diphtheria and tetanus toxoids. (From Dorland, 28th ed)
White blood cells. These include granular leukocytes (BASOPHILS; EOSINOPHILS; and NEUTROPHILS) as well as non-granular leukocytes (LYMPHOCYTES and MONOCYTES).
Subset of helper-effector T-lymphocytes which synthesize and secrete IL-17, IL-17F, and IL-22. These cytokines are involved in host defenses and tissue inflammation in autoimmune diseases.
Mice homozygous for the mutant autosomal recessive gene "scid" which is located on the centromeric end of chromosome 16. These mice lack mature, functional lymphocytes and are thus highly susceptible to lethal opportunistic infections if not chronically treated with antibiotics. The lack of B- and T-cell immunity resembles severe combined immunodeficiency (SCID) syndrome in human infants. SCID mice are useful as animal models since they are receptive to implantation of a human immune system producing SCID-human (SCID-hu) hematochimeric mice.
A cell line derived from cultured tumor cells.
A member of the tumor necrosis factor receptor superfamily with specificity for CD40 LIGAND. It is found on mature B-LYMPHOCYTES and some EPITHELIAL CELLS, lymphoid DENDRITIC CELLS. Evidence suggests that CD40-dependent activation of B-cells is important for generation of memory B-cells within the germinal centers. Mutations of the gene for CD40 antigen result in HYPER-IGM IMMUNODEFICIENCY SYNDROME, TYPE 3. Signaling of the receptor occurs through its association with TNF RECEPTOR-ASSOCIATED FACTORS.
The number of LYMPHOCYTES per unit volume of BLOOD.

Gene silencing: plants and viruses fight it out. (1/11788)

Plants can become 'immune' to attack by viruses by degrading specific viral RNA, but some plant viruses have evolved the general capacity to suppress this resistance mechanism.  (+info)

Constitutive activation of Stat3 signaling confers resistance to apoptosis in human U266 myeloma cells. (2/11788)

Interleukin 6 (IL-6) is the major survival factor for myeloma tumor cells and induces signaling through the STAT proteins. We report that one STAT family member, Stat3, is constitutively activated in bone marrow mononuclear cells from patients with multiple myeloma and in the IL-6-dependent human myeloma cell line U266. Moreover, U266 cells are inherently resistant to Fas-mediated apoptosis and express high levels of the antiapoptotic protein Bcl-xL. Blocking IL-6 receptor signaling from Janus kinases to the Stat3 protein inhibits Bcl-xL expression and induces apoptosis, demonstrating that Stat3 signaling is essential for the survival of myeloma tumor cells. These findings provide evidence that constitutively activated Stat3 signaling contributes to the pathogenesis of multiple myeloma by preventing apoptosis.  (+info)

Rapid autologous marrow recovery and eradication of infectious mononucleosis despite severe immunosuppression following second transplantation for aplastic anemia. (3/11788)

A patient with aplastic anemia failed to respond to immunosuppressive therapy and first marrow transplantation (BMT). Recovery of autologous hematopoiesis was rapid following a second stem cell transplant with a non-myeloablative preparatory regimen. The autologous immune response to infectious mononucleosis (IM) 4 weeks post-transplant was normal despite recent and ongoing severe immunosuppression.  (+info)

Innate and acquired humoral immunities to influenza virus are mediated by distinct arms of the immune system. (4/11788)

"Natural" Igs, mainly IgM, comprise part of the innate immune system present in healthy individuals, including antigen-free mice. These Igs are thought to delay pathogenicity of infecting agents until antigen-induced high affinity Igs of all isotypes are produced. Previous studies suggested that the acquired humoral response arises directly from the innate response, i.e., that B cells expressing natural IgM, upon antigen encounter, differentiate to give rise both to cells that secrete high amounts of IgM and to cells that undergo affinity maturation and isotype switching. However, by using a murine model of influenza virus infection, we demonstrate here that the B cells that produce natural antiviral IgM neither increase their IgM production nor undergo isotype switching to IgG2a in response to the infection. These cells are distinct from the B cells that produce the antiviral response after encounter with the pathogen. Our data therefore demonstrate that the innate and the acquired humoral immunities to influenza virus are separate effector arms of the immune system and that antigen exposure per se is not sufficient to increase natural antibody production.  (+info)

Poly(ADP-ribose) polymerase gene disruption conferred mice resistant to streptozotocin-induced diabetes. (5/11788)

Streptozotocin (STZ), a glucose analogue known to induce diabetes in experimental animals, causes DNA strand breaks and subsequent activation of poly(ADPribose) polymerase (Parp). Because Parp uses NAD as a substrate, extensive DNA damage will result in reduction of cellular NAD level. In fact, STZ induces NAD depletion and cell death in isolated pancreatic islets in vitro. Activation of Parp therefore is thought to play an important role in STZ-induced diabetes. In the present study, we established Parp-deficient (Parp-/-) mice by disrupting Parp exon 1 by using the homologous recombination technique. These mice were used to examine the possible involvement of Parp in STZ-induced beta-cell damage in vivo. The wild-type (Parp+/+) mice showed significant increases in blood glucose concentration from 129 mg/dl to 218, 370, 477, and 452 mg/dl on experimental days 1, 7, 21, and 60, respectively, after a single injection of 180 mg STZ/kg body weight. In contrast, the concentration of blood glucose in Parp-/- mice remained normal up to day 7, slightly increased on day 21, but returned to normal levels on day 60. STZ injection caused extensive necrosis in the islets of Parp+/+ mice on day 1, with subsequent progressive islet atrophy and loss of functional beta cells from day 7. In contrast, the extent of islet beta-cell death and dysfunction was markedly less in Parp-/- mice. Our findings clearly implicate Parp activation in islet beta-cell damage and glucose intolerance induced by STZ in vivo.  (+info)

Identification of regions in alleles of the flax rust resistance gene L that determine differences in gene-for-gene specificity. (6/11788)

Thirteen alleles (L, L1 to L11, and LH) from the flax L locus, which encode Toll/interleukin-1 receptor homology-nucleotide binding site-leucine-rich repeat (TIR-NBS-LRR) rust resistance proteins, were sequenced and compared to provide insight into their evolution and into the determinants of gene-for-gene resistance specificity. The predicted L6 and L11 proteins differ solely in the LRR region, whereas L6 and L7 differ solely in the TIR region. Thus, specificity differences between alleles can be determined by both the LRR and TIR regions. Functional analysis in transgenic plants of recombinant alleles constructed in vitro provided further information: L10-L2 and L6-L2 recombinants, encoding the LRR of L2, conferred L2 resistance specificity, and an L2-L10 recombinant, encoding the LRR of L10, conferred a novel specificity. The sequence comparisons also indicate that the evolution of L alleles has probably involved reassortment of variation, resulting from accumulated point mutations, by intragenic recombination. In addition, large deletion events have occurred in the LRR-encoding regions of L1 and L8, and duplication events have occurred in the LRR-encoding region of L2.  (+info)

Cyclophilin C-associated protein: a normal secreted glycoprotein that down-modulates endotoxin and proinflammatory responses in vivo. (7/11788)

Mouse cyclophilin C-associated protein (CyCAP) is a member of the scavenger-receptor cysteine-rich domain superfamily and is 69% identical to the human Mac-2 binding protein. Here, we show that CyCAP is a widely expressed secreted glycoprotein that modulates the host response to endotoxin. Gene-targeted CyCAP-deficient mice are more sensitive to the lethal effects of endotoxin. In response to endotoxin, CyCAP-deficient mice overproduced interleukin 12 and interferon-gamma systemically and tumor necrosis factor alpha locally; these are proinflammatory molecules that also promote T helper 1 responses. Furthermore, macrophages stimulated in vitro with endotoxin in serum deficient in CyCAP secreted more tumor necrosis factor alpha, supporting the proposal that CyCAP specifically down-modulates endotoxin signaling.  (+info)

Comparative genomics and host resistance against infectious diseases. (8/11788)

The large size and complexity of the human genome have limited the identification and functional characterization of components of the innate immune system that play a critical role in front-line defense against invading microorganisms. However, advances in genome analysis (including the development of comprehensive sets of informative genetic markers, improved physical mapping methods, and novel techniques for transcript identification) have reduced the obstacles to discovery of novel host resistance genes. Study of the genomic organization and content of widely divergent vertebrate species has shown a remarkable degree of evolutionary conservation and enables meaningful cross-species comparison and analysis of newly discovered genes. Application of comparative genomics to host resistance will rapidly expand our understanding of human immune defense by facilitating the translation of knowledge acquired through the study of model organisms. We review the rationale and resources for comparative genomic analysis and describe three examples of host resistance genes successfully identified by this approach.  (+info)

TY - JOUR. T1 - Genetic polymorphisms in host innate immune sensor genes and the risk of nasopharyngeal carcinoma in North Africa. AU - Moumad, K.. AU - Lascorz, J.. AU - Bevier, M.. AU - Khyatti, M.. AU - Ennaji, M.M.. AU - Benider, A.. AU - Huhn, S.. AU - Lu, S.. AU - Chouchane, L.. AU - Corbex, M.. AU - Hemminki, K.. AU - Forsti, A.. N1 - ITG-H10B; DPH; U-MRH; JIF; DOI; PDF; E-only; Abstract; DSPACE56. PY - 2013. Y1 - 2013. N2 - Nasopharyngeal carcinoma (NPC) is a rare malignancy in most parts of the world. It is an Epstein-Barr virus-associated malignancy with an unusual racial and geographical distribution. The host innate immune sensor genes play an important role in infection recognition and immune response against viruses. Therefore, we examined the association between polymorphisms in genes within a group of pattern recognition receptors (including families of toll-like receptors, C-type lectin receptors, and RIG-I-like receptors) and NPC susceptibility. Twenty six single nucleotide ...
IG-I is a major innate immune sensor for viral infection, triggering an interferon-mediated antiviral response upon cytosolic detection of viral RNA. Double-strandedness and 5-terminal triphosphates were identified as motifs required to elicit optimal immunological signaling. However, very little is known about the response dynamics of the RIG-I pathway, which is crucial for the cells ability to react to diverse classes of viral RNA, while maintaining self-tolerance. In the present study, we addressed the molecular mechanism of RIG-I signal detection and its translation into pathway activation. By employing highly quantitative methods, we could establish the length of the double-stranded RNA (dsRNA) to be the most critical determinant of response strength. Size exclusion chromatography and direct visualization in scanning force microscopy suggested, that this was due to cooperative oligomerization of RIG-I along dsRNA. Initiation efficiency of this oligomerization process was critically ...
Route of Infection Determines the Impact of Type I Interferons on Innate Immunity to Listeria monocytogenes. . Biblioteca virtual para leer y descargar libros, documentos, trabajos y tesis universitarias en PDF. Material universiario, documentación y tareas realizadas por universitarios en nuestra biblioteca. Para descargar gratis y para leer online.
The innate immune system plays a critical role in both the initial response to an invading pathogen, which frequently limits or contains pathogen replication and dissemination, and the induction of an effective adaptive immune response, which is most often the primary mechanism for pathogen clearance. The characteristics of the innate immune response are determined in part by the pathogen initiating the response but can also be influenced by the type of cell in which the response is generated. In this report, we examined the functional PRR-mediated pathways present in human neuronal cells and differentiated primary rat neurons, with a particular focus on those pathways previously identified as being important for antiviral innate immune responses in other cell types. We drew four main conclusions. First, human neuronal cells possess functional TLR3-, TLR4-, RIG-I-, and MDA5-mediated PRR pathways whose activity was maturation-dependent. Second, both extracellular and transfected poly(I-C) induced ...
Detection of pathogens by all living organisms is the primary step needed to implement a coherent and efficient immune response. This implies a mediation by different soluble and/or membrane-anchored proteins related to innate immune receptors called PRRs (pattern recognition receptors) to trigger immune signaling pathways. In most invertebrates, their roles have been inferred by analogy to those already characterized in vertebrate homologues. Despite the induction of their gene expression upon challenge and the presence of structural domains associated with the detection of pathogen-associated molecular patterns (PAMPs) in their sequence, their exact role in the induction of immune response and their binding capacity still remain to be demonstrated. To this purpose, we developed a fast interactome approach, usable on any host-pathogen couple, to identify soluble proteins capable of directly or indirectly detecting the presence of pathogens. To investigate the molecular basis of immune recognition
TY - JOUR. T1 - An essential role of macrophage inflammatory protein 1α/CCL3 on the expression of hosts innate immunities against infectious complications. AU - Takahashi, Hitoshi. AU - Tashiro, Tsuguhiko. AU - Miyazaki, Masaru. AU - Kobayashi, Makiko. AU - Pollard, Richard B.. AU - Suzuki, Fujio. PY - 2002/12/1. Y1 - 2002/12/1. N2 - Sepsis was induced by well-controlled cecal ligation and puncture (CLP) in macrophage inflammatory protein 1α (MIP-1α)/CCL3 knock-out (CCL3-/-) and severe combined immunodeficiency (SCID) mice. CCL3-/- mice and their littermates (CCL3+/+ mice) treated with anti-CCL3 monoclonal antibodies were susceptible (0-20% survival) to CLP-induced sepsis, and CCL3-/- mice supplemented with recombinant (r)CCL3 (250 ng/mouse) and CCL3+/+ mice were resistant (70-80% survival). The resistance of SCID mice to CLP was markedly improved by the rCCL3 administration (88% survival), and SCID mice treated with saline were shown to be middling resistant to the same CLP (45% survival). ...
Herpes simplex virus type 1 (HSV-1) infection triggers a rapid induction of host innate immune responses. The type I interferon (IFN) signal pathway is a central aspect of host defense which induces a wide range of antiviral proteins to control infection of incoming pathogens. In some cases, viral invasion also induces DNA damage response, autophagy, endoplasmic reticulum stress, cytoplasmic stress granules and other innate immune responses, which in turn affect viral infection. However, HSV-1 has evolved multiple strategies to evade host innate responses and facilitate its infection. In this review, we summarize the most recent findings on the molecular mechanisms utilized by HSV-1 to counteract host antiviral innate immune responses with specific focus on the type I IFN signal pathway.
The detection of intracellular microbial DNA is critical to appropriate innate immune responses; however, knowledge of how such DNA is sensed is limited. Here we identify IFI16, a PYHIN protein, as an intracellular DNA sensor that mediates the induction of interferon-beta (IFN-beta). IFI16 directly associated with IFN-beta-inducing viral DNA motifs. STING, a critical mediator of IFN-beta responses to DNA, was recruited to IFI16 after DNA stimulation. Lowering the expression of IFI16 or its mouse ortholog p204 by RNA-mediated interference inhibited gene induction and activation of the transcription factors IRF3 and NF-kappa B induced by DNA and herpes simplex virus type 1 (HSV-1). IFI16 (p204) is the first PYHIN protein to our knowledge shown to be involved in IFN-beta induction. Thus, the PYHIN proteins IFI16 and AIM2 form a new family of innate DNA sensors we call AIM2-like receptors (ALRs ...
Innate immunity is the inborn immunity of the person. Innate immunity is non-specific in nature. The response of innate immune depends on the recognition o..
Patterns of selection acting on immune defence genes have recently been the focus of considerable interest. Yet, when it comes to vertebrates, studies have mainly focused on the acquired branch of the immune system. Consequently, the direction and strength of selection acting on genes of the vertebrate innate immune defence remain poorly understood. Here, we present a molecular analysis of selection on an important receptor of the innate immune system of vertebrates, the Toll-like receptor 2 (TLR2), across 17 rodent species. Although purifying selection was the prevalent evolutionary force acting on most parts of the rodent TLR2, we found that codons in close proximity to pathogen- binding and TLR2-TLR1 heterodimerization sites have been subject to positive selection. This indicates that parasite-mediated selection is not restricted to acquired immune system genes like the major histocompatibility complex, but also affects innate defence genes. To obtain a comprehensive understanding of ...
TY - JOUR. T1 - NONO Detects the Nuclear HIV Capsid to Promote cGAS-Mediated Innate Immune Activation. AU - Lahaye, Xavier. AU - Gentili, Matteo. AU - Silvin, Aymeric. AU - Conrad, Cécile. AU - Picard, Léa. AU - Jouve, Mabel. AU - Zueva, Elina. AU - Maurin, Mathieu. AU - Nadalin, Francesca. AU - Knott, Gavin J.. AU - Zhao, Baoyu. AU - Du, Fenglei. AU - Rio, Marlène. AU - Amiel, Jeanne. AU - Fox, Archa H.. AU - Li, Pingwei. AU - Etienne, Lucie. AU - Bond, Charles S.. AU - Colleaux, Laurence. AU - Manel, Nicolas. PY - 2018/10/4. Y1 - 2018/10/4. N2 - Detection of viruses by innate immune sensors induces protective antiviral immunity. The viral DNA sensor cyclic GMP-AMP synthase (cGAS) is necessary for detection of HIV by human dendritic cells and macrophages. However, synthesis of HIV DNA during infection is not sufficient for immune activation. The capsid protein, which associates with viral DNA, has a pivotal role in enabling cGAS-mediated immune activation. We now find that NONO is an ...
RIG-I is a cytoplasmic surveillance protein that contributes to the earliest stages of the vertebrate innate immune response. The protein specifically recognizes 5-triphosphorylated RNA structures that are released into the cell by viruses, such as influenza and hepatitis C. To understand the energ …
In this study, we aimed to define the established associations between MHC genes and viral outcomes in the context of the IFNL3-linked polymorphisms. We were in a unique position to address this, as we were able to investigate these relationships in a cohort of women who had been infected with HCV from a single source. We wished to address whether the observed MHC associations would remain significant in the context of the profound innate immune effect.. We first considered whether there might be a differential effect according to the characteristics of the innate immune response, by analysing the impact of carriage of either the protective or deleterious IFNL3 genotype with respect to the HLA effect on viral outcomes. In our HLA Class I analysis, we did, to an extent, observe this effect. The presence of the protective alleles HLA-B*27 and -C*01 was significantly enriched in those with viral clearance if the unfavourable IFNL3 genotype was present. In this cohort, the HLA-B*27 and C*01 alleles ...
Lien vers Pubmed [PMID] - 21512573. Nature 2011 Apr;472(7343):361-5. TRIM5 is a RING domain-E3 ubiquitin ligase that restricts infection by human immunodeficiency virus (HIV)-1 and other retroviruses immediately following virus invasion of the target cell cytoplasm. Antiviral potency correlates with TRIM5 avidity for the retrovirion capsid lattice and several reports indicate that TRIM5 has a role in signal transduction, but the precise mechanism of restriction is unknown. Here we demonstrate that TRIM5 promotes innate immune signalling and that this activity is amplified by retroviral infection and interaction with the capsid lattice. Acting with the heterodimeric, ubiquitin-conjugating enzyme UBC13-UEV1A (also known as UBE2N-UBE2V1), TRIM5 catalyses the synthesis of unattached K63-linked ubiquitin chains that activate the TAK1 (also known as MAP3K7) kinase complex and stimulate AP-1 and NFκB signalling. Interaction with the HIV-1 capsid lattice greatly enhances the UBC13-UEV1A-dependent E3 ...
My prior studies focused on the pathogenesis of cigarette-smoke (CS) -induced lung diseases such as chronic obstructive pulmonary disease (COPD), wherein we demonstrated that the IL-18 system plays an important role in the pathogenesis of CS-induced emphysematous lung destruction. These studies led me to question the effect of CS on innate immunity on the interaction between the host and microorganisms and, for this purpose, I had established a murine cigarette smoke and virus co-exposure model. These studies revealed important insight into the interaction between CS and the innate immunity resulting in a publication in the Journal of Clinical Investigation. In that study, we identified that CS smoke selectively augments respiratory antiviral innate immune responses via a MAVS-RLHs antiviral signaling pathway. To gain better understanding of the mechanisms, my laboratory is focusing on the role(s) of mitochondrial dysfunction and immune dysregulation in the setting of smoking exposure. By ...
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Oral manifestations of HIV have been documented since the initial presentation of the HIV/AIDS epidemic of the 80s. The most common oral complication was candi...
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Immunity System. Discuss about Immunity System, Two Divisions of Mammal Immune System, INNATE IMMUNITY (NON-SPECIFIC), ACQUIRED IMMUNITY....
Mycobacterial infection induces a specific human innate immune response John D Blischak , Ludovic Tailleux , Amy Mitrano , Luis B Barreiro , Yoav Gilad doi: http://dx.doi.org/10.1101/017483 The innate immune system provides the first response to pathogen infection and orchestrates the activation of the adaptive immune system. Though a large component of the innate immune…
Innate immunity represents the foremost barrier to viral infection. In order to infect a cell efficiently, viruses need to evade innate immune effectors such as interferons and inflammatory cytokines. Pattern recognition receptors can detect viral components or pathogen-associated molecular patterns. These receptors then elicit innate immune responses that result in the generation of type I interferons and proinflammatory cytokines. Organized by the Society for General Microbiology, one session of this conference focused on the current state-of-the-art knowledge on innate barriers to infection of different RNA and DNA viruses. Experts working on innate immunity in the context of viral infection provided insight into different aspects of innate immune recognition and also discussed areas for future research. Here, we provide an overview of the session on innate barriers to infection.. ...
The innate immune system is the first line of response to pathogens and tissue injury. Specialized cells have evolved mechanisms to detect microbial and distress signals and translate these into effector mechanisms that fight infections, amplify inflammation, initiate acquired immunity and eventually resolve. Although the innate immune response is usually associated with infectious disease, it has been implicated in a broad range of diseases, including cancer, autoimmunity, degenerative and vascular diseases. This conference provides multidisciplinary perspectives on innate immunity, from fundamental science to clinical aspects of disease, as well as therapeutic approaches to immune modulation. The conference program will focus on recent advances in this rapidly developing field. Presentations will provide new insights into mechanisms of microbial and distress sensing and the effector mechanisms of innate immune cells including macrophages, neutrophils, dendritic cells and innate lymphoid cells. ...
Clipped females, with an increased heat loss rate, fed their offspring less frequently (Figs 1 and 2), and had higher innate immune function (Table 2, Fig. 3), than unclipped females. Males fed their offspring at similar rates regardless of treatment (Figs 1 and 2), and their immune function indices were unaffected by the experiment (Fig. 3). Despite reduced effort and increased investment in self-maintenance in females, body mass and size were not compromised in nestlings of clipped parents (Table S1). Thus, reduced constraints of overheating allowed for increased constitutive innate immune function, but only in females. A relatively higher level of constitutive innate immune function is supposed to be beneficial for survival. For example, levels of complement activity have been shown to correlate positively with survival (Hegemann et al., 2015), and high BKA correlated positively with survival probability upon an epidemic outbreak (Wilcoxen et al., 2010).. These benefits possibly occur because ...
Microbial DNA induces the expression of type I IFNs and proinflammatory cytokines, leading to the potent induction of innate immunity (Stetson and Medzhitov, 2006a; Kawai and Akira, 2009). Furthermore, synthesized DNA stimulates the innate immune system and acts as a good adjuvant to induce the efficient induction of acquired immune responses (Ishii et al., 2008a). Indeed, TLR9, the receptor for single-stranded DNAs containing unmethylated CpG motifs, is involved in the protection of hosts suffering DNA virus infection, and the ligands for TLR9 efficiently induce acquired immune responses upon vaccination. However, dsDNA derived from bacteria and DNA viruses, as well as host genomic DNA from dying cells, could induce the expression of both type I IFNs and IFN-inducible genes via a TLR-independent pathway (Okabe et al., 2005; Ishii et al., 2006; Stetson and Medzhitov, 2006b; Stetson et al., 2008). Although the specific sensors involved in dsDNA-induced innate immune responses are still unclear, ...
The rapid detection of microbial agents is essential for the effective initiation of host defence mechanisms against infection. Understanding how cells detect cytosolic DNA to trigger innate immune gene transcription has important implications - not only for comprehending the immune response to path …
Fights any foreign invader and thus is non-specific. Innate immunity and adaptive immunity are the two categories of the immune system of animals. There are both similarity and difference between innate and adaptive immunity. Memory usage: 1408.09KB, Persistent Low Grade Fever: Causes and Remedies, Humoral immunity, consisting of B cells and plasma cells, Cell mediated immunity, consisting of T cells, which further matures into helper T cells, suppressor T cells and cytotoxic T cells. Innate immunity includes all the defence elements with which an individual is born. Innate immunity is also known as genetic immunity or familial immunity. Innate immunity means the non-specific immunity.it is present at the time of birth. Difference Between Adaptive Immunity and Innate Immunity: Innate Immunity. Humans have a high degree of resistance to foot-and-mouth disease, for example, while the cattle and sheep with which they may be in close contact suffer in the thousands from it.Rats are highly resistant ...
Kanazawa, Japan - Although the innate immune system is the front line of defense against microbial infections, the complex mechanisms of innate immunity are incompletely understood. In a new study, researchers from Kanazawa University synthesized and characterized the bacterial toxin Monalysin to enable the study of how the innate immune system and toxin-producing bacteria interact with each other.. The innate immune system detects microbial infections through sensing either microbial molecules (pathogen-associated molecular patterns, or PAMPs) or host signaling molecules that are released from damaged host cells (damage-associated molecular patterns, or DAMPs). The bacterium Pseudomonas entomophila has been utilized as a tool to study the mechanisms of DAMPs in the gut. P. entomophila infects insects and damages intestinal cells using a pore-forming toxin called Monalysin. Monalysin is secreted as an inactive pro-toxin, which is then activated by certain proteins called proteases. Although the ...
The HIV Immune Networks Team (HINT) is a multidisciplinary group comprised of thirteen investigators located in seven different institutions across the United States. Our aim is to understand the early immune response to HIV-1 infection using a systems biology approach. To accomplish this goal, we have assembled a team of world experts in the areas of systems biology, virology, immunology, human genetics, and computational biology. We aim to develop rigorously-validated computational models that reflect, as well as predict, the early innate immune response to HIV-1 exposure. These models will provide valuable new insights into how our innate immune system responds to HIV-1 infection, and ultimately dictate course of infection and disease progression. A mathematical understanding of these dynamic molecular circuits will aid in the development of HIV-1 vaccines and antiviral therapeutics.. ...
Numerous human genetic and acquired diseases could be corrected or ameliorated if viruses are harnessed to safely and effectively deliver therapeutic genes to diseased cells and tissues in vivo. Innate immune and inflammatory response represents one of the key stumbling blocks during the development of viral-based therapies. In this review, current data on the early innate immune responses to viruses and to the most commonly used gene therapy vectors (using adenovirus and adeno-associated virus) will be discussed. Recent findings in the field may help develop new approaches to moderate these innate immune anti-viral responses and thus improve the safety of viral vectors for human gene therapy applications.
Multicellular organisms, in order to survive, have developed a wide range of defense mechanisms that have the ability to rapidly recognize pathogens and mount an early effective antimicrobial response by preventing infection, destroying the invading pathogens or neutralizing their virulence factors. These functions are the domain of innate immune cells such as macrophages, dendritic cells (DCs), neutrophils, natural killer (NK) cells and NKT cells. Although the innate immune system was described by Metchnikoff over a century ago, there are still at least three fascinating problems in host innate defense against microbial invasion. First, how does the host innate defense recognize and destroy many different pathogens? Second, how does the host discriminate between constituents of the external world, microbial non-self, and the constituents of self? And third, how does the innate immune system direct and dictate the type and magnitude of the adaptive immune responses. The main focus of our ...
Toll-like receptors (TLRs) are major receptors of the host innate immune system that recognize conserved pathogen-associated molecular patterns (PAMPs) of invading microbes. Activation of TLR signaling culminates in the expression of multiple genes in a coordinate and kinetically defined manner. In this review, we summarize the current studies describing the chromatin landscape of TLR-responsive inflammatory genes and how changes to this chromatin landscape govern cell type-specific and temporal gene expression. We further elaborate classical endotoxin tolerance and epigenetic mechanisms controlling tolerance and interferon priming effects on inflammatory promoters.
The cellular localisation of many innate signalling events following viral infection has yet to be elucidated, however there has been a few cases in which membranes of certain cellular organelles have acted as platforms to these events. Of these, lipid droplets (LDs) have recently been identified as signalling platforms for innate TLR7 and 9 signalling. Despite their wide range of similar roles in various metabolic pathways, LDs have been overlooked as potential platforms for antiviral innate signalling events. This study established an in vitro model to evaluate the efficiency of the early innate immune response in cells with reduced LD content to the viral mimics, dsDNA and dsRNA, and Sendai viral infection. Using RT-qPCR, the expression of IFN- and IFN-λ was quantified following stimulation along with the expression of specific ISGs. Luciferase based assays evaluated the combined expression of ISRE-promoter driven ISGs under IFN- stimulation. Cellular LD content did not alter the entry of ...
Dr. Marzena Pazgier is an Assistant Professor at the Institute of Human Virology and the Department of Biochemistry and Molecular Biology of the University of Maryland School of Medicine. She obtained her doctoral degree in Technical Chemistry of Sciences at the Technical University of Lodz, Poland, in 2001. In 2002 she joined the Macromolecular Crystallography Laboratory at NCI-Frederick, NIH, as postdoctoral fellow to study structures and function proteins engaged in early innate immune responses, such as defensins. At the Institute of Human Virology Dr. Pazgier continued studies on defensins, but also expanded her research to explore role of Fc-mediated effector functions such as antibody-dependent cellular cytotoxicity (ADCC) in preventing or modulating HIV-1 infection. Her research program combines structural biology by X-Ray crystallography and contemporary biophysical and protein engineering techniques.. Currently Dr. Pazgier is the Project Leader within the Lewis CAVD Consortium where ...
The purpose of the program project grant is to evaluate the placental, decidual and maternal immune interactions from a new perspective, that a positive interaction between placental and maternal components exist together to support and protect pregnancy and does not represent the classic graft/rejection interaction. Trophoblast cells, decidual (stromal and endothelial) cells, as well as cells of the innate immune system, communicate with each other throughout a network of cytokines and chemokines. Such crosstalk occurs through the expression of innate immune sensors, known as Toll-like Receptors (TLRs) that are expressed at the maternal-fetal interface and serve as sensors for the recognition and response to the environment throughout implantation and gestation. Our studies focus on the expression, regulation and function of TLRs in each of the cellular components of the maternal-fetal interface, and to evaluate their role in pregnancy success providing a complete picture of molecular ...
In this study we focused on the signaling of V antigen-induced innate immunity responses. For the first time we demonstrate that a bacterial nonlipidated protein associated with virulence and derived synthetic oligopeptides are capable to induce IL-10 production via TLR2/CD14 signaling. In contrast to the pseudomonas rPcrV, rLcrV (range of activity: 10-100 nM) transmits signaling via TLR2 in a CD14-dependent manner leading to IL-10 induction which finally causes TNF-α suppression thus probably enabling yersiniae to evade the host innate immune system. Several lines of evidence obtained in vitro both in murine and human cell systems support this conclusion: (a) Only CD14-TLR2-cotransfected HEK 293 cells, but not cells transfected with TLR2 alone responded with NF-κB-dependent ELAM-1 promoter luciferase activity upon rLcrV stimulation. (b) Blocking anti-CD14 monoclonal antibodies, but not nonblocking isotype anti-CD14 antibodies completely abolished TNF-α suppression in LcrV-treated MonoMac-6 ...
Studencka, M.; Konzer, A.; Moneron, G.; Wenzel, D.; Opitz, L.; Salinas-Riester, G.; Bedet, C.; Krüger, M.; Hell, S. W.; Wisniewski, J. R. et al.; Schmidt, H.; Palladino, F.; Schulze, E.; Jedrusik-Bode, M. A.: Novel roles of Caenorhabditis elegans heterochromatin protein HP1 and linker histone in the regulation of innate immune gene expression. Molecular and Cellular Biology 32 (2), pp. 251 - 265 (2012 ...
Studencka, M.; Konzer, A.; Moneron, G.; Wenzel, D.; Opitz, L.; Salinas-Riester, G.; Bedet, C.; Krüger, M.; Hell, S. W.; Wisniewski, J. R. et al.; Schmidt, H.; Palladino, F.; Schulze, E.; Jedrusik-Bode, M. A.: Novel roles of Caenorhabditis elegans heterochromatin protein HP1 and linker histone in the regulation of innate immune gene expression. Molecular and Cellular Biology 32 (2), pp. 251 - 265 (2012 ...
The Toll/interleukin-1 receptor/resistance protein (TIR) domain is a protein-protein interaction domain consisting of 125-200 residues, widely distributed in animals, plants and bacteria but absent from fungi, archea and viruses. In plants and animals, these domains are found in proteins with functions in innate immune pathways, while in bacteria, some TIR domain-containing proteins interfere with the innate immune pathways in the host. TIR domains function as protein scaffolds, mostly involving self-association and homotypic interactions with other TIR domains. In the last 15 years, the three-dimensional structures of TIR domains from several mammalian, plant and bacterial proteins have been reported. These structures, jointly with functional data including the identification of interacting proteins, have started to provide insight into the molecular basis of the assembly of animal and plant immune signaling complexes, and for host immunosuppression by bacterial pathogens. This review focuses ...
Dr. Darveau received his Ph.D. in bacteriology from Washington State University and did his postdoctoral research in the Department of Microbiology at the University of British Columbia studying structure/function relationships in the outer membrane of Pseudomonas aeruginosa. He is a Research Professor in the Department of Periodontics.. Our research is centered on the innate host response to microbial colonization and infection. We are keenly interested in the inflammatory component of the innate host response. Our laboratory studies both the microbial components that elicit inflammation and the activation pathways employed by the host in response to different microbial components. We study responses to both commensal and pathogenic bacteria. We employ biochemical isolation and analytical techniques to characterize the microbial components. Examples of microbial components that we have studied are lipopolysaccharide form gram negative bacteria and lipoteichoic acid from gram positive bacteria. ...
Product Description specificalInvolved in autophagic vesicle formation. Conjugation with ATG12, through a ubiquitin-like conjugating system involving ATG7 as an E1-like activating enzyme and ATG10 as an E2-like conjugating enzyme, is essential for its function. The ATG12-ATG5 conjugate acts as an E3-like enzyme which is required for lipidation of ATG8 family proteins and their association to the vesicle membranes. Involved in mitochondrial quality control after oxidative damage, and in subsequent cellular longevity. The ATG12- ATG5 conjugate also negatively regulates the innate antiviral immune response by blocking the type I IFN production pathway through direct association with RARRES3 and MAVS. Also plays a role in translation or delivery of incoming viral RNA to the translation apparatus. Plays a critical role in multiple aspects of lymphocyte development and is essential for both B and T lymphocyte survival and proliferation. Required for optimal processing and presentation of antigens for ...
Chronic kidney disease is widespread in the western world with bacterial infection and sepsis as common complication. It has been shown that innate immune defence, represented by dysfunction of neutrophil granulocytes, is impaired in chronic kidney disease. Another impact of chronic kidney disease on innate immunity is the chronic activation of neutrophils leading to high levels of inflammatory cytokines, thus contributing to protein oxidation. Oxidation of human serum albumin (HSA), the major plasma protein, occurs in chronic kidney disease and leads to further activation of neutrophils. Another important impact of HSA oxidation is the decrease of its binding capacity leading to impaired detoxification ability of albumin. This includes reduced clearance of endotoxin, a major component of the gram negative bacterial cell wall. Circulating endotoxin is recognized by complex formation with lipopolysaccharide binding protein (LBP) followed by binding to CD14 and toll-like receptor (TLR) 4. High ...
1 Functions of the innate and adaptive arms of the immune system. Innate Immune Cells Adaptive Immune Cells Immune recognition Immune effector mechanisms Immune regulation Immunological memory response - particularly the adaptive arm of the immune response - occurs in the secondary lymphoid organs draining the site of infection. The immune system has evolved a number of effector mechanisms capable of destroying pathogenic organisms. 1). The innate arm of the immune system recognises pathogens non-specifically and generates immediate generic mechanisms of pathogen clearance. Many cytokine receptors are dimeric, and the chains making up some of the cytokine receptors are promiscuous. For example, the common ␥ chain (CD132) is shared by a number of cytokine receptors (notably the receptors for interleukin (IL)-2, IL-4, IL-7, IL-9, IL-15 and IL-21), and the IL-4R chain (IL-4R␣) pairs with IL-␣13R to convey signals in response to IL-13. 8 Adaptive immunity The adaptive immune response differs ...
To differentiate between the contribution of mammary epithelial cells (MEC) and infiltrating immune cells to gene expression profiles of mammary tissue during early stage mastitis, we investigated in goats the in vivo transcriptional response of MEC to an experimental intra mammary infection (IMI) with Staphylococcus aureus, using a non-invasive RNA sampling method from milk fat globules (MFG). Microarrays were used to record gene expression patterns during the first 24 hours post-infection (hpi). This approach was combined with laser capture microdissection of MEC from frozen slides of mammary tissue to analyze some relevant genes at 30 hpi. During the early stages post-inoculation, MEC play an important role in the recruitment and activation of inflammatory cells through the IL-8 signalling pathway and initiate a sharp induction of innate immune genes predominantly associated with the pro-inflammatory response. At 30 hpi, MEC express genes encoding different acute phase proteins, including ...
The consequences of altered ADAR1 function are severe, from embryonic lethality in mice to debilitating neurological disease and systemic interferonopathy in humans with loss-of-function alleles [22, 52], to putative oncogenic roles when overexpressed [31, 53, 54], so it is critical to clearly define the key function(s) of ADAR1. In contrast to the physiologically essential role of transcript recoding by ADAR2, the importance of recoding to the biology of ADAR1 was unknown. In addition to protein recoding, ADAR1 can edit dsRNA substrates resulting in changes in multiple aspects of miRNA biogenesis or function, affect mRNA stability, 3-UTR length and translation, and modify splice site usage in addition to altering dsRNA secondary structures, which have been proposed to interface with the innate immune sensing system [19, 55]. We now demonstrate that the absence of ADAR1-mediated editing is surprisingly well tolerated, once the innate immune sensor MDA5 is deleted. Adar1 E861A/E861A Ifih1 -/- ...
The research group on innate immunity and bacterial infections not only consist of postdocs, PhD students, and technicians. We also offer bachelor and master students the opportunity to follow a trainee internship and to participate in the different research projects. Regardless of the specific subject, being the complement system, phage display, bacterial glycobiology, or phagocyte biology, many techniques and experimental setups are common in the research group. These techniques are both in the field of microbiology and the host defence employing molecular biology (bacterial protein expression, mutagenesis, gene regulation, knock-outs, eukaryotic receptor expression and mutagenesis), protein and carbohydrate chromatography and analysis (including purification of host defence proteins), functional assays using flow cytometry, confocal and electron microscopy, and some in-vivo infection models. The students become a full member of the participating research group with daily supervision. ...
The innate immune mechanism described here clears bacteria and protects against pneumonia. We show that in response to infection, pleural B cells relocate to the lung and produce abundant natural IgM, which is known to protect against infection (Boes et al., 1998; Baumgarth et al., 2000; Fabrizio et al., 2007; Choi and Baumgarth, 2008; Litvack et al., 2011; Schwartz et al., 2012). B cell-derived GM-CSF is the autocrine instructor required for emergency IgM production. Recently identified IRA B cells, which differentiate from B1a B cells in the mouse via direct TLR-dependent pathogen recognition, are key to this process and therefore to early innate immune defense.. GM-CSF was identified in the 1960s as a colony stimulator of granulocytes and mononuclear cells, though not erythrocytes (Bradley and Metcalf, 1966). GM-CSF-deficient mice, which were independently generated by two groups in 1994 (Dranoff et al., 1994; Stanley et al., 1994), show no striking perturbations of hematopoiesis in the ...
Immune sensor proteins are critical to the function of the human innate immune system. The full repertoire of cognate triggers for human immune sensors is not fully understood. Here, Robinson, Zhong, Reversade and team report that the human NLR, NLRP1, is activated by 3C proteases (3Cpros) of enteroviruses. Their findings establish 3Cpros as a pathogen-derived trigger for the human NLRP1 inflammasome and suggest that NLRP1 may contribute to inflammatory diseases of the airway. ...
TY - JOUR. T1 - Effects of tobacco smoking on innate immunity. T2 - A study based on neutrophil phagocytic index. AU - Thakur, Tanu. AU - Bhide, Arpana. AU - Chaudhury, Abhijit. AU - Thota, Asha. AU - Kasala, Latheef. AU - Hulikal, Narendra. PY - 2018/4/1. Y1 - 2018/4/1. N2 - The present study was undertaken to find out the effects of tobacco smoking on innate immune mechanism of the body. A total of 60 adult consenting men in the age group of 30 to 50 years were recruited of which 30 were chronic smokers and the rest were non smoking controls. 5ml of venous blood was drawn from each of the subjects and the following parameters were assessed: phagocytic index of neutrophils (which is an index of neutrophil function and is defined as number of neutrophils positive for ingested microbes per 100 neutrophils), total leucocyte count (TLC), differential count of neutrophils. The values from smokers were compared with those from non-smokers. There was a statistically significant decrease in the ...
Overwhelming inflammatory responses leading to neutrophil invasion are hypothesised to be the main cause of mortality in influenza virus induced acute respiratory distress syndrome (ARDS). Previously, pulmonary surfactant has been shown to modulate inflammatory responses to bacterial agents. The aim of the present study was to investigate the effect of pulmonary surfactant on innate immune responses in an in vitro model of influenza virus infected human airway epithelial cells. Human lung type II alveolar epithelial cells A549 and BEAS-2B human bronchial epithelial cells were infected with influenza A virus H1N1 strains A/Swine/1976/31, A/WSN/33 and A/PR/8/34. Poly I:C, Escherichia coli Ol 11 :B4 LPS and measles virus strain Edmonston were used as cytokine stimulation controls. The effect of pulmonary surfactant was compared to that of dexamethasone. This in vitro study showed that physiological concentrations (up to 500 ug/ml) of clinically approved SP-A and SP-D depleted surfactant ...
Genetic variations in innate immunity genes affect response to Coxiella burnetii and are associated with susceptibility to chronic Q ...
Hepatitis C virus (HCV) infection and alcoholic liver disease synergistically promote the progression of advanced liver disease and non-response to interferon (IFN)-based antiviral therapy. The purpose of this study is to explore how ethanol (EtOH) establishes a favorable environment for HCV replication by deregulating antiviral innate immunity in the hepatocyte. ❧ Results show that not all of the known anti-HCV interferon (IFN) stimulated genes (ISGs), which are the effectors of intracellular innate immunity, are inducible in the hepatocyte. In addition, the mRNA induction of selected anti-HCV hepatocyte-inducible ISGs by IFN is impaired in the presence of EtOH in vitro, though mRNA induction by IFN and impairment by EtOH in vivo can vary from in vitro results. Furthermore, the induction of a potent ISG IRF1 is heterogeneous among hepatocytes in EtOH-fed mice. ❧ In conclusion, EtOH attenuates the ISG response, and this defect in antiviral immunity may be partially attributable to suppressed ...
The innate immune response is critical for host defense and must be tightly controlled, but the molecular mechanisms responsible for its negative regulation are not yet completely understood. In this study, we report that transporter 1, ATP-binding cassette, subfamily B (TAP1), a virus-inducible endoplasmic reticulum-associated protein, negatively regulated the virus-triggered immune response. In this study, we observed upregulated expression of TAP1 following virus infection in human lung epithelial cells (A549), THP-1 monocytes, HeLa cells, and Vero cells. The overexpression of TAP1 enhanced virus replication by inhibiting the virus-triggered activation of NF-κB signaling and the production of IFNs, IFN-stimulated genes, and proinflammatory cytokines. TAP1 depletion had the opposite effect. In response to virus infection, TAP1 interacted with the TGF-β-activated kinase (TAK)1 complex and impaired the phosphorylation of TAK1, subsequently suppressing the phosphorylation of the IκB kinase ...
Innate immune genes tend to be highly conserved in metazoans, even in early divergent lineages such as Cnidaria (jellyfish, corals, hydroids and sea anemones) and Porifera (sponges). However, constant and diverse selection pressures on the immune system have driven the expansion and diversification of different immune gene families in a lineage-specific manner. To investigate how the innate immune system has evolved in a subset of sea anemone species (Order: Actiniaria), we performed a comprehensive and comparative study using 10 newly sequenced transcriptomes, as well as three publically available transcriptomes, to identify the origins, expansions and contractions of candidate and novel immune gene families. We characterised five conserved genes and gene families, as well as multiple novel innate immune genes, including the newly recognised putative pattern recognition receptor CniFL. Single copies of TLR, MyD88 and NF-κB were found in most species, and several copies of IL-1R-like, NLR and CniFL
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Innate immunity is characterized by production of type I interferon which is necessary for the stimulation of effective anti-viral host defense. Upon recognition of cytosol viral dsRNA species, RIG-I-Like Receptors (RLRs), as well as many co-regulators, are recruited to adaptor protein IPS-1 and trigger innate immune responses. FADD (Fas associated with death domain) and RIP1 (receptor-interacting protein 1), have been reported to be recruited to this IPS-1 complex during viral infection and essential for optimal RLR signaling. Here we reported a novel type I interferon inducible DExD/H family helicase DDX24, which was found and confirmed to specifically associate with FADD through yeast two hybrid system and co-immunoprecipitation. Overexpression of DDX24 negatively regulates dsRNA induced type I IFNs signaling, while knockdown of DDX24 by siRNA has the opposite effect. Moreover, Plaque assays of virus titer consistently demonstrate that DDX24 also negatively regulates the cellular antiviral response.
TY - JOUR. T1 - Lgt processing is an essential step in Streptococcus suis lipoprotein mediated innate immune activation. AU - Wichgers, P.J.. AU - Rebel, J.M.J.. AU - Smits, M.A.. AU - van Putten, J.P.. AU - Smith, H.E.. PY - 2011. Y1 - 2011. N2 - Background Streptococcus suis causes invasive infections in pigs and occasionally in humans. The host innate immune system plays a major role in counteracting S. suis infections. The main components of S. suis able to activate the innate immune system likely include cell wall constituents that may be released during growth or after cell wall integrity loss, however characterization of these components is still limited. Methology/Principal Findings A concentrated very potent innate immunity activating supernatant of penicillin-treated S. suis was SDS-PAGE fractionated and tested for porcine peripheral blood mononucleated cell (PBMC) stimulating activity using cytokine gene transcript analysis. More than half of the 24 tested fractions increased IL-1ß ...
The á2â1 integrin is expressed on many cell types throughout the immune system. Expression of the á2â1 integrin on mast cells is required for the early innate immune response to Listeria monocytogenes. Interaction between the á2â1 integrin and Listeria occurs through C1q within a Listeria immune complex, but is not sufficient for activation suggesting an additional co-receptor is required for activation. We demonstrate that Listeria immune complex activation of mast cells occurs through crosstalk between the á2â1 integrin and c-met. The best described mechanism of mast cell activation is IgE-mediated degranulation. We examined the mechanism of mediator release by mast cells following activation by Listeria immune complex. Activation by Listeria immune complex results in á2â1 integrin-dependent release of IL-6 from a granule pool that is distinct from known mast cell granules, identifying a novel population of mast cell granules. The á2â1 integrin-dependent early innate immune ...
Toda la información sobre las últimas publicaciones científicas de la Clínica Universidad de Navarra. Surfactant protein d, a marker of lung innate immunity, is positively associated with insulin sensitivity
Looking for online definition of innate immunity in the Medical Dictionary? innate immunity explanation free. What is innate immunity? Meaning of innate immunity medical term. What does innate immunity mean?
Innate immunity is the first-line, non-specific response to any breach of our bodies. Conclusion Cells of both the innate and adaptive immune systems are false. Besides their contribution to host defence via innate mechanisms, MC also promote adaptive immune responses through physical interactions with CD4 and CD8 T cells (Fig. Innate and adaptive immunity is a very complex biological process. 5. The ratio of T cells to B cells is. Humoral adaptive immunity vs. cell-mediated adaptive immunity. ... they are on the cell surface and help the immune system determine self not self Adaptive immunity refers to antigen-specific immune response. Humoral adaptive immunity vs. cell-mediated adaptive immunity. If youre seeing this message, it means were having trouble loading external resources on our website. 3: Innate immunity is orchestrated through phagocytes (Macrophages, and Neutrophils) and Natural Killer cells. Cell mediated immunity, consisting of T cells, which further matures into helper T ...
Upon viral infection, the major defense mounted by the host innate immune system is activation of the IFN- and apoptosis-mediated antiviral pathway. In order to complete their life cycle, viruses that are obligatory intracellular parasites must modulate these host immune responses. We have previously shown that the γHV68 latency-associated M2 protein effectively downregulates STAT1 and STAT2, resulting in the inhibition of type I and II IFN-mediated transcriptional activation. Here, we demonstrate that M2 interacts with ATM, a DNA damage signal transducer, and the DDB1/COP9/cullin DNA damage effector complex. This interaction blocked DNA damage-sensing activity as well as DNA damage repair activity, thereby rendering cells resistant to DNA damage-induced apoptosis. These results indicate that γHV68 encodes M2, a latency-associated gene, to antagonize both IFN- and apoptosis-mediated host innate immunities and thus is important in establishing and maintaining viral latency in infected ...
Acute lower respiratory tract infections cause a terrible public health burden at present, with potential for worse in the coming years. The outcome of these infections is determined by innate immune responses (such as neutrophil recruitment and activation), necessary for host defense but also contributing to lung injury. Innate immune responses in the lungs require the coordinated expression of diverse mediators including adhesion molecules, chemokines, colony stimulating factors, and cytokines that are absent or present only at low levels in uninfected lungs, but are expressed at high levels during infection. Similar mediators are induced during most lung infections, although individual mediators can have different roles during different infections. The coordinated expression suggests programs of gene regulation. NF-kappaB transcription factors are critical to the gene expression program directing innate immunity in the lungs, with RelA inducing innate immunity genes mediating host defense and ...
BACKGROUND: Nucleotide binding oligomerisation domain 2 (NOD2; also known as CARD15) mutations are associated with Crohns disease but how mutations cause disease is poorly understood. Innate immune responses are reportedly enhanced by combined NOD2 ligand (muramyl dipeptide, MDP) and Toll-like receptor 4 ligand (TLR4, lipopolysaccharide) stimulation. Intestinal TLR signalling has a dual role-maintaining intestinal homeostasis and protection from injury as well as initiating inflammatory responses. TLR9 is functional in the intestinal epithelium where it is most strongly expressed in Paneth cells. AIMS: To study possible interactions between CpG DNA (TLR9 ligand) and MDP using primary human cells of differing NOD2 genotypes. SUBJECTS: NOD2 wild-type healthy controls (n = 7) and NOD2 homozygous Crohns disease patients (n = 19), age and sex matched. METHODS: Peripheral blood mononuclear cells were stimulated with CpG DNA and MDP. Cytokines were measured by enzyme linked immunosorbent assay. RESULTS:
Viral recognition by the host innate immune system has become an exciting and growing area of research focus in recent years. It is now apparent that multiple pattern recognition receptor (PRR) families, including Toll-like receptors (TLRs), RIG-I-like receptors (RLRs) and NOD-like receptors (NLRs), contribute significantly to viral detection by sensing viral proteins and nucleic acids, leading to induction of cytokines and type I interferons (IFNs). Of particular current interest is the sensing of viral DNA within infected cells, since the PRRs responsible for this are only partially defined. Recently RNA polymerase III (Pol III) was shown to transcribe some viral DNAs into RNA for detection by RIG-I, leading to IFN induction. Another novel mechanism of viral DNA recognition unveiled, leading to proinflammatory cytokine production, involves the PYHIN family member AIM2 ...
Systemic autoimmunity is thought to result from a mix of genetics, environmental factors and stochastic events [6]. Given the multitude of susceptibility genes, symptoms and immunological abnormalities, it is clear that numerous pathogenic pathways contribute to systemic autoimmune disease [5, 11, 12]. A major thrust of systemic autoimmunity research has centered on elucidation of abnormalities in the adaptive immune response [13, 14]. However more recent research has identified the innate immune response as a major player in the initiation and expansion of systemic autoimmune pathology [4, 5, 9, 15, 16].. The current paradigm for the disease process of idiopathic systemic lupus-like autoimmunity argues for a central role of type I IFN [15, 17, 18]. This is based on the early observation of increased expression of IFN-α inducible genes (or IFN signature) in the peripheral blood cells of patients with SLE [17]. The type I IFN signature is found in 60% to 70% of patients with SLE, ...
Matrix Metalloproteinase (MMP)-12 activity has been attributed to cleavage of cytokines, and digestion of extracellular matrix components related to the pathogenesis of diverse conditions, including atherosclerosis and aortic aneurysms. We hypothesise that a major role for MMP-12 is its regulation of gene expression during the innate antiviral immune response, controlling the secretion of alpha interferon (IFN-α) during enterovirus induced myocarditis. We employed an MMP-12 knockout mouse model of enteroviral myocarditis to determine the role of MMP-12 during the antiviral response. Electromobility shift assay (EMSA), Chromatin immunoprecipitation PCR (ChIP) and ChIP combined with Illumina-Solexa sequencing (ChIP-seq) were used to analyse the regions of the human genome bound by MMP-12 under control and virus infected conditions. Traditional immunofluorescence microscopy and molecular biology approaches were also used to confirm the results of the genomic ChIP studies. Coxsackievirus type-B3 ...
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Full Text PA-97-079 INNATE IMMUNITY NIH GUIDE, Volume 26, Number 24, July 25, 1997 PA NUMBER: PA-97-079 P.T. 34 Keywords: Immunology National Institute of Allergy and Infectious Diseases National Institute of Dental Research PURPOSE The National Institute of Allergy and Infectious Diseases (NIAID) and the National Institute of Dental Research (NIDR), National Institutes of Health (NIH), invite applications for research studies of the innate immune system. Two general systems of immune recognition have been selected through evolution: innate immunity and acquired immunity. The innate immune system provides broad, but relatively nonspecific host defenses that lack the properties of antigenic specificity and immunologic memory that characterize acquired immunity. However, recent discoveries point to many robust mechanisms of innate immunity and have highlighted important functional links between the innate and acquired immune responses. The purpose of the PA is to support basic and preclinical ...
Abstract: Infection by human papillomavirus (HPV) alters the microenvironment of keratinocytes as a mechanism to evade the immune system. A-to-I editing by ADAR1 has been reported to regulate innate immunity in response to viral infections. Here, we evaluated the role of ADAR1 in HPV infection in vitro and in vivo. Innate immune activation was characterized in human keratinocyte cell lines constitutively infected or not with HPV. ADAR1 knockdown induced an innate immune response through enhanced expression of RIG-I-like receptors (RLR) signaling cascade, over-production of type-I IFNs and pro-inflammatory cytokines. ADAR1 knockdown enhanced expression of HPV proteins, a process dependent on innate immune function as no A-to-I editing could be identified in HPV transcripts. A genetic association study was performed in a cohort of HPV/HIV infected individuals followed for a median of 6 years (range 0.1-24). We identified the low frequency haplotype AACCAT significantly associated with recurrent ...
The NF-kappaB pathway has been shown to play a critical role in both adaptive and innate immunity and has been implicated as a focal point for induction of lung inflammation by a variety of inflammatory stimuli; however, the role of NF-kappaB in specific lung cell types remains unclear. We hypothesized that individual cell types in the lungs make important and unique contributions to the NF-kappaB dependent innate immune response. To determine the temporal and cell specific activation of NF-kappaB in vivo, an NF-kappaB reporter mouse in which expression of an enhanced green fluorescent protein (eGFP)/luciferase fusion protein cDNA driven by an NF-kappaB inducible promoter (NGL mouse) was generated. NF-kappaB activity was detected in intact, anesthetized animals by bioluminescence imaging and at the cellular level by detection of GFP on lung tissue sections. Using Eschericia coli lipopolysaccharide (LPS) and Pseudomonas aeruginosa models of lung inflammation, the timing and duration of NF-kappaB ...
Learn about increasing the immunity system of the body with different techniques for various conditions. Immunity can also be improved naturally or by consuming immunity boosting foods
BACKGROUND/AIMS: Type I interferon (IFN-1) production and IFN-1 signaling play critical roles in the host antiviral innate immune responses. Although transcription factor Yin Yang 1 (YY1) has been reported to have a dual activator/repressor role during the regulation of interferon beta (IFN-β) promoter activity, the roles of YY1 in the regulation of upstream signaling pathways leading to IFN-1 induction and IFN-1 signaling during viral infection remain to be elucidated. METHODS: The roles of YY1 in IFN-1 production and IFN-1 signaling were investigated using immunoblotting, real-time PCR, small interfering RNA (siRNA)-mediated YY1 knockdown, YY1 overexpression by transient transfection, and co-immunoprecipitation, using mouse cells ...
Advancing knowledge regarding the biology of Crohns Disease (CD) has identified that the hosts innate immunity may impact on the development of intestinal inflammation. Pattern recognition receptors and the Toll-like receptors are able to detect both gram positive and gram negative bacteria, yeasts and flagellin and respond by activation of the innate immune system. By identification of the unmethylated CpG dinucleotide sequences found in bacteria, lymphocytes are stimulated, proinflammatory cytokines like interleukin (IL)-12 and the interferons are induced, and both the mucosal and host defences against the invading pathogens are increased.. A body of evidence from clinical and experimental observations indicates a role for endogenous digestive microflora in the pathogenesis of inflammatory bowel disease (IBD). The distal ileum and the colon are the areas with highest luminal bacterial concentrations and represent the sites of inflammation in IBD. Probiotics have been shown to reduce ...
Professor Paul Hertzog is a NHMRC Senior Principal Research Fellow, Head of the Centre for Innate Immunity and Infectious Diseases, Associate Director of the Hudson Institute of Medical Research, Professor at Monash University and an Adjunct Professor of the Chinese Academy of Sciences. He obtained his PhD from the University of Melbourne and undertook postdoctoral positions in the USA at the Eppley Institute of Cancer Research and at the University of York in the UK. He has an established record of research on innate immune responses in infection, inflammation and cancer, particularly regulation by interferons. His groups work has been published in eminent journals including Cell, Science, Nature Immunology, Nature Medicine, Immunity, and the Journal of Clinical Investigation, etc. This work resulted in Professor Hertzog being awarded the international 2013 Milstein Award for Excellence in Interferon and Cytokine Research. Professor Hertzog is co-founder of the Victorian Infection and Immunity ...
Pathogen recognition receptor signaling induces p38 kinase-dependent priming phosphorylation of IFNAR1.(A) KR-2 cells were treated with CpG (10 µM for 30 min)
CIIID is a scientific research center based at the University of Washington School of Medicine in Seattle, where researchers from diverse scientific backgrounds work together and focus their expertise to discover how innate immunity dictates the bodys response to infectious disease or impacts autoimmune disease. CIIID scientists have access to four world class service cores with specific expertise in innate immunity: Human Cell Signaling, Transgenic Mouse Core, Immuno-informatics & Computational Modeling Core, and Translation Core. The CIIID also features an Education Core that hosts multiple programs for middle and high school students to conduct research in innate immunity. For additional information about The Center for Innate Immunity and Immune Disease, visit CIIID website at https://ciiid.washington.edu/. ...
By virtue of its direct contact with the environment, the lung is constantly challenged by infectious and non-infectious stimuli that necessitate a robust yet highly controlled host response coordinated by the innate and adaptive arms of the immune system. Mammalian Toll-like receptors (TLRs) function as crucial sentinels of microbial and non-infectious antigens throughout the respiratory tract and mediate host innate immunity. Selective induction of inflammatory responses to harmful environmental exposures and tolerance to innocuous antigens are required to maintain tissue homeostasis and integrity. Conversely, dysregulated innate immune responses manifest as sustained and self-perpetuating tissue damage rather than controlled tissue repair. In this article we review aspects of Toll-like receptor function that are relevant to the development of acute lung injury and chronic obstructive lung diseases as well as resistance to frequently associated microbial infections.
Three different families of pattern recognition receptors, toll-like (TLRs), Nod-like (NLRs), and RIG-I-like, initiate innate immunity, the inborn host response to common pathogens such as viruses, bacteria, and fungi. These receptors recognize and bind pathogen-associated molecular patterns (PAMPs) such as viral DNA and RNA, or bacterial and fungal cell wall components. PAMP-receptor binding activates the innate immune response, initiates downstream signaling, and induces expression of inflammatory cytokines as well as the type-I interferon response. The innate immune system attracts immune cells to the site of infection, and activates the adaptive immune response. This initial immune response is essential to combat a novel foreign pathogen. Dysregulation of innate immune processes can lead to widespread infection, sepsis, and immunodeficiencies ...
Three different families of pattern recognition receptors, toll-like (TLRs), Nod-like (NLRs), and RIG-I-like, initiate innate immunity, the inborn host response to common pathogens such as viruses, bacteria, and fungi. These receptors recognize and bind pathogen-associated molecular patterns (PAMPs) such as viral DNA and RNA, or bacterial and fungal cell wall components. PAMP-receptor binding activates the innate immune response, initiates downstream signaling, and induces expression of inflammatory cytokines as well as the type-I interferon response. The innate immune system attracts immune cells to the site of infection, and activates the adaptive immune response. This initial immune response is essential to combat a novel foreign pathogen. Dysregulation of innate immune processes can lead to widespread infection, sepsis, and immunodeficiencies ...
Toll-like receptors are pattern recognition receptors that play a vital role in innate immunity pathways as they detect pathogen-associated molecular patterns on bacteria, fungi, protozoa, and viruses. Many TLRs are expressed on the plasma membrane while TLR7, TLR8, and TLR9 are expressed within the cell on the endosome. Upon activation, TLRs dimerize and bind to TIR-containing adaptor proteins including TRIF, TIRAP, TRAM, and MyD88. Downstream signaling through IKKs and the NFκB pathway results in the production of inflammatory cytokines and interferons.. Click on the poster below to view the interactive version.. ...
QUIET PRIMING BY NEXT GENERATION VACCINE ADJUVANTS. Dr. Mitchell is dedicated to discovering how the immune system can be safely stimulated to fight disease. His work is most relevant to development of vaccine adjuvants, which are used in modern vaccines to boost their effectiveness without causing harm or unnecessary discomfort.. Modern immunology is guided by the paradigm that innate immunity against microbes is necessary for adaptive immunity to be generated in individuals for long term protection against re-infection. Dr. Mitchells research to advance safe immunostimulation is based on the idea that partial signaling through receptors of the innate immune system can achieve sufficient priming of the adaptive immune response so as to be protective while minimizing counterproductive effector responses by innate immune cells such as neutrophils and macrophages. TLR4-MD2, the innate receptor for bacterial LPS, is currently a focus of research for the Mitchell lab because it is targeted by a ...
Terada T, Nii T, Isobe N, Yoshimura Y (2018) Changes in the expression of avian β-defensin (AvBDs) and proinflammatory cytokines and localization of AvBD2 in the intestine of broiler embryos and chicks during their growth. Journal of Poultry Science (in press). Kang Y , Nii T, Isobe N, Yoshimura Y (2018) Effects of TLR ligands on the expression of cytokines and possible role of NFκB in its process in the theca of chicken follicles. Journal of Poultry Science (in press). Matsukawa S, Ueno K, Sugino T, Yoshimura Y, Isobe N (2018) Effects of colostrum whey on immune function in the digestive tract of goats. Animal Science Journal (in press). Elgawish RA, Ogata Y, Hidaka T, Nii T, Yoshimura Y, Isobe N (2018) Changes in plasma concentrations of S100A7 and S100A8 in dairy cows during pregnancy. Reproduction in Domestic Animals (in press). Elhamouly M, Terada T, Nii T, Isobe N, Yoshimura Y (2018) Innate antiviral immune response against infectious bronchitis virus and involvement of prostaglandin E2 ...
Recognition and degradation of viral RNA are essential for antiviral innate immune responses. Zinc-finger proteins (ZFPs) are gaining intensive concern because they are a..
Nitric oxide (NO) is a major mediator of host innate immunity with antimicrobial activity against a broad range of pathogens. Specific targeting of protein metal centers, thiols, and other radicals can disrupt microbial metabolism and limit pathogen growth during infection. The opportunistic pathogen Staphylococcus aureus is relatively resistant to NO-mediated growth inhibition, yet NO remains important to control infection. A possible mechanism by which host NO is protective, beyond growth inhibition, may be through the direct targeting of systems that regulate the production of virulence factors, such as toxins. In Staphylococcus aureus, cell-to-cell communication known as quorum sensing regulates virulence and determines whether interactions with a mammalian host are commensal or pathogenic. Despite the importance of quorum sensing to infection, little is known about how host immunity affects inter-bacterial communication. In this thesis, I show that NO, a bacteriostatic effector of innate ...
Lgt processing is an essential step in Streptococcus suis lipoprotein mediated innate immune activation. PLoS One. 2011;6(7):e22299 ...
Previous observations in this laboratory showed that injection of culture-derived trypomastigotes (CT), in CBA/J mice, induced an early increased resistance that was detected 24-72 hr after antigen injection and permitted mice to survive a challenge of 105 blood trypomastigotes (BT) corresponding to 2000 LD50%. Present experiments were conducted to determine the optimal conditions for inducing this early resistance and to investigate the early morphological changes which occurred in blood and lymphoid organs of mice infected with either BT or CT. Among nine antigens tested, only living CT showed a protective effect permiting most of mice to survive 30 days after BT challenge, while control mice injected with PBS or other antigens died at 10 ± 1 days. A dose-response relationship was seen when different doses of CT were tested, higher doses of CT inducing higher survival and lower parasitemia. Injection of CT by either an im or ip route induced similar degrees of resistance but significantly ...
Adaptive- B and T cells - slow to respond- … Innate and adaptive immunity is a very complex biological process. Although, as a group, pattern-recognition receptors (PRRs) can recognize many pathogens, the innate … Antigen receptors are genetically rearranged clonal receptors that bind to antigen displayed in. Innate immunity is always present in the body while adaptive immunity only occurs in response to exposure to an external factor. The potency of adaptive immunity is very high. Test your knowledge and determine where to start. Over the last week, she had been feeling tired and found it difficult to stay awake in class. First, lets start with innate immunity… The adaptive immune response is meant to attack non-self pathogens but can sometimes make errors and attack itself. This way the defense respon… Innate vs. adaptive immunity. If youre seeing this message, it means were having trouble loading external resources on our website. Types of Immunity and the Immune System. The early ...
Dr. Viswanathans research efforts over the past 12 years have focused on the mechanisms of pathogenesis of the diarrheal disease pathogens enteropathogenic and enterohemorrhagic Escherichia coli (EPEC and EHEC). His laboratory characterized EPEC and EHEC virulence factors (specifically those secreted into host cells) and evaluates their effect on host cell physiology including barrier function, cell death pathways, and effects on innate immune responses. His specialization is innate immune signaling by intestinal epithelial cells in vitro and in vivo, and includes the use of cutting-edge technologies such as in vivo phosphoproteomics, and single-cell manipulation during bacterial infection. He also offers a very popular upper-division course in pathogenic bacteriology, and actively mentors undergraduate and graduate students, and post-doctoral fellows at the UA. Keywords: Pathogenic E. coli, Clostridium difficile, infection, host-pathogen interactions ...
Specific families of pattern recognition receptors are responsible for detecting microbial pathogens and generating innate immune responses. Toll-like receptors (TLRs) are membrane-bound receptors identified as homologs of Toll in Drosophila. Mammalian TLRs are expressed on innate immune cells, such as macrophages and dendritic cells, and respond to the membrane components of Gram-positive or Gram-negative bacteria. Pathogen recognition by TLRs provokes rapid activation of innate immunity by inducing production of proinflammatory cytokines and upregulation of costimulatory molecules. TLR signaling pathways are separated into two groups: a MyD88-dependent pathway that leads to the production of proinflammatory cytokines with quick activation of NF-{kappa}B and MAPK, and a MyD88-independent pathway associated with the induction of IFN-beta and IFN-inducible genes, and maturation of dendritic cells with slow activation of NF-{kappa}B and MAPK ...
Innate immunity employs Toll-like receptors (TLRs) and Nod-like receptors (NLRs), both families of so-called pattern recognition receptors (PRRs), to detect a variety of different exogenous and endogenous insults. Exogenous insults include bacteria, viruses and fungi.. Upon engagement of their cognate microbe-derived molecular ligands, PRRs initiate distinct intracellular signalling pathways via receptor-proximal adaptor molecules, and subsequent NF-kB- and IRF-mediated gene transcription activates immediate innate immune responses and primes adaptive immunity. Since the discovery of human TLRs in 1997, other families of mainly cytosolic pattern recognition receptors (PRRs) have been described, for example, the RIG-I-like receptors (RLRs), Nod/NACHT-LRR-like receptors (NLRs) and AIM2-like receptors (ALRs). Together with TLRs, these PRR fulfill the important function of immune surveillance in the innate immune system and mark the first line of immune detection for most microbes. Apart from their ...
Adaptive immunity towards tuberculosis (TB) has been extensively studied for many years. In addition, in recent years the profound contribution of innate immunity to host defence against this disease has become evident. The discovery of pattern recognition receptors, which allow innate immunity to tailor its response to different infectious agents, has challenged the view that this arm of immunity is nonspecific. Evidence is now accumulating that innate immunity can remember a previous exposure to a microorganism and respond differently during a second exposure. Although the specificity and memory of innate immunity cannot compete with the highly sophisticated adaptive immune response, its contribution to host defence against infection and to vaccine-induced immunity should not be underestimated and needs to be explored. Here, we present the concept of trained immunity and discuss how this may contribute to new avenues for control of TB.. ...
Adipose tissue of an organism plays a major role in regulating physiologic and pathologic processes such as metabolism and immunity by producing and secreting a variety of bioactive molecules termed adipokines. One highly conserved family of adipokines is adiponectin/ACRP30 and its structural and functional paralogs, the C1q/tumor necrosis factor-alpha-related proteins (CTRPs) 1-7. Unlike adiponectin, which is expressed exclusively by differentiated adipocytes, the CTRPs are expressed in a wide variety of tissues. These proteins are thought to act mainly on liver and muscle tissue to control glucose and lipid metabolism. An analysis of the crystal structure of adiponectin revealed a structural and evolutionary link between TNF and C1q-containing proteins, suggesting that these proteins arose from a common ancestral innate immunity gene. CTRP5 has been suggested to be involved in age-related macular degeneration.
Natural killer (NK) cells are innate immune system lymphocytes with an integral role in host defense against HIV infection. and promote the cytotoxic features that Rabbit polyclonal to JAK1.Janus kinase 1 (JAK1), is a member of a new class of protein-tyrosine kinases (PTK) characterized by the presence of a second phosphotransferase-related domain immediately N-terminal to the PTK domain.The second phosphotransferase domain bears all the hallmarks of a protein kinase, although its structure differs significantly from that of the PTK and threonine/serine kinase family members. kill focus CBR 5884 on cells. Once older, NK cells circulate in the tissue and bloodstream even though surveying for contaminated or malignant cells. Although NK cells are formidable players in the immune system response against infections, genetically modifying NK cells expressing CARs could improve NK cell targeting of malignant and infected cells. Within this review, the function is certainly talked about by us of NK ...
Innate Immunity is a peer-reviewed scientific journal covering innate immunity in humans, animals, and plants. It is published ... "Innate Immunity". 2012 Journal Citation Reports. Web of Science (Science ed.). Thomson Reuters. 2013. Official website ... Innate Immunity Society and the editor-in-chief is Otto Holst (Research Centre Borstel, Germany). The journal was established ... Innate Immunity Society (Articles with short description, Short description is different from Wikidata, Bimonthly journals ( ...
"IL-22 increases the innate immunity of tissues". Immunity. 21 (2): 241-54. doi:10.1016/j.immuni.2004.07.007. PMID 15308104. ... "The aryl hydrocarbon receptor regulates gut immunity through modulation of innate lymphoid cells". Immunity. 36 (1): 92-104. ... Pavlova A, Sharafutdinov I (September 2020). "Recognition of Candida albicans and Role of Innate Type 17 Immunity in Oral ... Type 3 innate lymphoid cells (ILC3) are immune cells from the lymphoid lineage that are part of the innate immune system. These ...
"Prostitutes lose HIV immunity". BBC News. 1999. Retrieved 20 January 2015. Ruiz-Mateos E, Tarancon-Diez L, Alvarez-Rios AI, ... A small proportion of humans show partial or apparently complete innate resistance to HIV, the virus that causes AIDS. The main ... also causes innate resistance to HIV-1. The gene TNP03 was known to be involved into virus transportation into the infected ... Prostitutes lose HIV immunity". 2021-10-03. Archived from the original on 2021-10-03. Retrieved 2022-08-02. " ...
Many different cells of the innate immune system express a myriad of CLRs which shape innate immunity by virtue of their ... December 2015). "Targeting Innate Immunity for Antiviral Therapy through Small Molecule Agonists of the RLR Pathway". Journal ... Alberts B, Johnson A, Lewis J, Raff M, Roberts K, Walter P (2002). Innate Immunity. Schroder K, Tschopp J (March 2010). "The ... Dommett RM, Klein N, Turner MW (September 2006). "Mannose-binding lectin in innate immunity: past, present and future". Tissue ...
Chahin AB, Opal JM, Opal SM (November 2018). "Whatever happened to the Shwartzman phenomenon?". Innate Immunity. 24 (8): 466- ...
Chahin, Abdullah B; Opal, Jason M; Opal, Steven M (2018). "Whatever happened to the Shwartzman phenomenon?". Innate Immunity. ...
Innate Immunity. 22 (3): 238-244. doi:10.1177/1753425916632305. PMID 26888964. Shima T, Okumura N, Takao T, Satomi Y, Yagi T, ... Sharma N, Akhade AS, Qadri A (April 2016). "Src kinases central to T-cell receptor signaling regulate TLR-activated innate ...
Both innate and adaptive immunity promote efficient recovery from SeV infection. Using the mechanisms outlined below the virus ... SeV can attenuate cell defense mechanisms and allow itself to escape from host innate immunity by inhibiting the interferon ... October 2018). "Sendai virus C protein limits NO production in infected RAW264.7 macrophages". Innate Immunity. 24 (7): 430-438 ... Journal of Innate Immunity. 3 (2): 200-7. doi:10.1159/000321194. PMID 21051868. S2CID 6699971. Johansson E, Domeika K, Berg M, ...
In addition to natural killer cells being effectors of innate immunity, both activating and inhibitory NK cell receptors play ... so are part of innate immunity, i.e. able to react immediately with no prior exposure to the pathogen. In both mice and humans ... "Innate or adaptive immunity? The example of natural killer cells". Science. 331 (6013): 44-9. Bibcode:2011Sci...331...44V. doi: ... Innate Immunity. 27 (3): 212-229. doi:10.1177/17534259211001512. ISSN 1753-4259. PMC 8054151. PMID 33761782. Vivier E, Raulet ...
Innate Immunity. 22 (3): 238-244. doi:10.1177/1753425916632305. PMID 26888964. Duan H, Jing L, Jiang X, Ma Y, Wang D, Xiang J, ... Sharma N, Akhade AS, Qadri A (April 2016). "Src kinases central to T-cell receptor signaling regulate TLR-activated innate ...
Innate Immunity. 24 (1): 24-39. doi:10.1177/1753425917740727. PMC 6830765. PMID 29145791. Shityakov S, Förster C (2014-09-02 ...
Innate Immunity. 20 (2): 115-125. doi:10.1177/1753425913484374. ISSN 1753-4259. PMID 23676582. S2CID 206787156. Creagh, Emma M ... Caspase-1 therefore plays a fundamental role in the innate immune system. The enzyme is responsible for processing cytokines ... Immunity. 44 (2): 221-231. doi:10.1016/j.immuni.2016.01.020. ISSN 1074-7613. PMID 26885855. Jänicke, Reiner U.; Sohn, Dennis; ... December 2014). "Caspase crosstalk: integration of apoptotic and innate immune signalling pathways". Trends in Immunology. 35 ( ...
Innate Immunity. 23 (7): 592-605. doi:10.1177/1753425917727838. PMID 28853313. S2CID 206788250.{{cite journal}}: CS1 maint: ... antigen-presenting cells that serve as a bridge linking the adaptive and innate immune system), can detect mycobacterial ...
Innate immunity, also known as native immunity, is a semi-specific and widely distributed form of immunity. It is defined as ... Innate immunity is present in all metazoans, while adaptive immunity only occurs in vertebrates. The innate component of the ... Antiserum Antivenin Cell-mediated immunity Herd immunity Heterosubtypic immunity Hoskins effect Humoral immunity Immunology ... Active immunity often involves both the cell-mediated and humoral aspects of immunity as well as input from the innate immune ...
... has been proposed to affect innate immunity to viruses by interfering with the mitochondrial antiviral signaling protein ... O'Neill LA (Apr 2008). "Innate immunity: squelching anti-viral signalling with NLRX1". Current Biology. 18 (7): R302-4. doi: ... Innate Immunity. 19 (4): 438-48. doi:10.1177/1753425912467383. PMID 23212541. S2CID 20642957. Castaño-Rodríguez N, Kaakoush NO ... NLRX1 also plays a role in host immunity during bacterial infections, such as Chlamydia trachomatis and Helicobacter pylori, by ...
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Innate Immunity. 27 (3): 212-229. doi:10.1177/17534259211001512. ISSN 1753-4259. PMC 8054151. PMID 33761782. Peng H, Tian Z ( ... Immunity. 42 (3): 443-56. doi:10.1016/j.immuni.2015.02.008. PMC 4612277. PMID 25786176. Béziat V, Liu LL, Malmberg JA, Ivarsson ... Immunity. 47 (5): 820-833. doi:10.1016/j.immuni.2017.10.008. PMC 5728700. PMID 29166586. Hammer Q, Romagnani C (Nov 30, 2016 ... Immunity. 42 (3): 431-42. doi:10.1016/j.immuni.2015.02.013. PMC 4537797. PMID 25786175. Perera Molligoda Arachchige, Arosh ...
Innate Immunity. 15 (5): 261-312. doi:10.1177/1753425909106436. PMID 19710102. (All articles with dead external links, Articles ...
Innate Immunity. 25 (1): 34-45. doi:10.1177/1753425918819754. PMC 6830888. PMID 30782041. "Experimental human endotoxemia as a ... Infection and Immunity. 86 (6): e00004-18. doi:10.1128/IAI.00004-18. PMC 5964521. PMID 29581192. "List Biological Laboratories ...
... and thus innate immunity. Antibodies bind to antigens on the pathogen surface, enabling adaptive immunity. Opsonins that ... Innate Immunity. 16 (3): 191-200. doi:10.1177/1753425910369271. PMID 20529971. S2CID 8344490. Zhang Y, Hoppe AD, Swanson JA ( ... A pivotal role for innate immunity in the clearance of apoptotic cells". European Journal of Immunology. 34 (4): 921-9. doi: ... Opsonins are related to the two types of immune systems: the adaptive immune system and the innate immune system. Antibodies ...
Innate Immunity. 7 (1): 63-68. doi:10.1177/09680519010070011101. PMID 11521085. Type strain of Bordetella trematum at BacDive ...
TLR4 is required for activation of innate immunity upon recognition of LPS of Gram-negative bacteria. The ability of TLR4/MD-2 ... Innate Immunity. 15 (5): 261-312. doi:10.1177/1753425909106436. PMID 19710102. S2CID 23755382. Opal, Steven M.; Laterre, Pierre ... and its role in innate immunity". Drug Metabolism and Disposition. 29 (4 Pt 2): 474-478. ISSN 0090-9556. PMID 11259335. ... "Modulating the innate immune response by combinatorial engineering of endotoxin". Proceedings of the National Academy of ...
"Innate immunity in the horseshoe crab". In R. Alan B. Ezekowitz & Jules Hoffmann (eds.). Innate Immunity. Humana Press. pp. 109 ...
... dual function cytokines mediating antiviral immunity and damage control". Current Opinion in Immunology. Innate immunity. 56: ... Stiff A, Carson W (2015). "Investigations of interferon-lambda for the treatment of cancer". Journal of Innate Immunity. 7 (3 ... Egli A, Santer DM, O'Shea D, Tyrrell DL, Houghton M (July 2014). "The impact of the interferon-lambda family on the innate and ...
L.J.C. van Loon (2009). Plant Innate Immunity. Academic Press. ISBN 978-0-08-088879-8. MycoBank Straininfo of Penicillium ...
... diversity and priming in innate antiviral immunity". Cytokine & Growth Factor Reviews. Special Issue: Innate Sensing and ... Mossman, Karen (2017). Innate Antiviral Immunity. ISBN 978-1-4939-7237-1. Kepp, Oliver; Senovilla, Laura; Vitale, Ilio; ...
... (MAVS) is a protein that is essential for antiviral innate immunity. MAVS is located ... Vazquez C, Horner SM (July 2015). "MAVS Coordination of Antiviral Innate Immunity". Journal of Virology. 89 (14): 6974-6977. ... Mohanty A, Tiwari-Pandey R, Pandey NR (September 2019). "Mitochondria: the indispensable players in innate immunity and ... Vazquez C, Beachboard DC, Horner SM (2017). "Methods to Visualize MAVS Subcellular Localization". Innate Antiviral Immunity. ...
Non-specific immunity, or innate immunity, is the immune system with which you were born, made up of phagocytes and barriers. ... "Innate (Non-specific) Immunity". Microbiology and Immunology Online. Mosser DM, Edwards JP (2008). "Exploring the full spectrum ... The innate immune system is always present at the site of infection and ready to fight the bacteria; it can also be referred to ... Innate Immunity. Available from: https://www.ncbi.nlm.nih.gov/books/NBK26846/ Lien, Egil; Ingalls, Robin (January 2002). "Toll- ...
Vercammen E, Staal J, Beyaert R (January 2008). "Sensing of viral infection and activation of innate immunity by toll-like ... Kumar A, Srivastava P, Sirisena P, Dubey SK, Kumar R, Shrinet J, Sunil S (August 2018). "Mosquito Innate Immunity". Insects. 9 ... That immunity is present in the populations because of other diseases caused by related viruses (for example, dengue). That the ... As it was endemic in Africa, local populations had developed some immunity to it. When an outbreak of yellow fever would occur ...
Zibelman M, Borghaei H, Olszanski AJ (2014). "Harnessing Innate Immunity". In Dubel S, Reichert JM (eds.). Handbook of ...
"Innate Immunity and Asthma Risk in Amish and Hutterite Farm Children". New England Journal of Medicine. 375 (5): 411-421. doi: ...
Payne DC, Parashar UD, Lopman BA (February 2015). "Developments in understanding acquired immunity and innate susceptibility to ... This immunity does not fully protect against infection with the other diverse genotypes of the virus. In Canada, norovirus is a ... After infection, immunity to the same strain of the virus - the genotype - protects against reinfection for between 6 months to ... Leon, Juan (2008). "Chapter 9". In Vajdy, Michael (ed.). Immunity Against Mucosal Pathogens. Springer. p. 232. ISBN 978-1-4020- ...
Possessed of innate beauty and easy gracefulness, they are viewed as both wondrous and haughty by other races; however, their ... ISBN 978-0-7869-4725-6. Ever wonder why elves are immune to paralysis? As far as we can figure out, that immunity came from a ...
... although the precise mechanism of how this confers immunity is unclear. Coronaviruses evade innate immunity during the first ... Journal of Innate Immunity. 6 (5): 563-74. doi:10.1159/000360084. PMC 6741612. PMID 24751921. Espinosa V, Dutta O, McElrath C, ... "Type III interferon is a critical regulator of innate antifungal immunity". Science Immunology. 2 (16): eaan5357. doi:10.1126/ ... "Innate Immune Antagonism of Mosquito-Borne Flaviviruses in Humans and Mosquitoes". Viruses. 13 (11): 2116. doi:10.3390/ ...
... a protein complex associated with activation of innate immunity which, when overactive, can cause disease symptoms. The human ...
Immunity. 50 (2): 288-301. doi:10.1016/j.immuni.2019.01.019. ISSN 1074-7613. PMID 30784577. Junqueira, Carneiro. Basic ... and dendritic cells of the innate immune system. The granulocytes, also called polymorphonuclear leukocytes because of their ...
... family which plays a fundamental role in pathogen recognition and activation of innate immunity. TLRs are highly conserved from ... Olson JK, Miller SD (September 2004). "Microglia initiate central nervous system innate and adaptive immune responses through ... December 2009). "Recognition of lipopeptide patterns by Toll-like receptor 2-Toll-like receptor 6 heterodimer". Immunity. 31 (6 ... Genes and Immunity. 14 (7): 420-6. doi:10.1038/gene.2013.34. PMC 3791179. PMID 23823019. Lien E, Ingalls RR (January 2002). " ...
Responding to Volgin's innate overriding desire for revenge, the two broke out, with Volgin as the Man on Fire. The boy and the ... and Ocelot reveals that her immunity to bullets was simply the result of an electromagnetic force field surrounding her body, ...
"Types of Immunity to a Disease , CDC". www.cdc.gov. 6 April 2022. Retrieved 24 April 2022. Watts S (1997). Epidemics and ... The 2'-5'-oligoadenylate synthase (OAS) component of the innate immune response has been shown to be particularly important in ... This demonstrates that immunity does not decrease with time. The World Health Organization recommends the vaccine between the ... Most people begin to develop immunity within ten days of vaccination and 99 percent are protected within one month, and this ...
Phagocytes are an essential component of the host's innate immune system with various antimicrobial defense mechanisms to clear ... Wilson, G. S. (1955). Topley and Wilson's principles of bacteriology and immunity. London, England: Edward Arnold Publishers ... Infection and Immunity. 67 (8): 4041-7. doi:10.1128/IAI.67.8.4041-4047.1999. PMC 96697. PMID 10417172. Boschiroli, ML; Ouahrani ... Infectious immunity 69 (2001): 4528-4535. Kemp, Jeffrey M. and Miller, Lowell A. "Oral vaccination and immunocontraception of ...
In order to evade detection by the host, YopE uses a number of different eukaryotic signalling pathways to counteract innate ... YopE GAP activity inhibits two common methods of host immunity - phagocytosis and reactive oxygen species generation. ...
Pathogen Recognition by Innate Immunity and its Signaling Masaaki Sugiyama - The Mongol Empire and Dai-ön Ulus Asahiko Taira - ...
... covering both humoral immunity and cell-mediated immunity. McKenzie's research investigates how the innate immune system and ... "Nuocytes represent a new innate effector leukocyte that mediates type-2 immunity". Nature. 464 (7293): 1367-1370. doi:10.1038/ ... "Type-2 innate lymphoid cells control the development of atherosclerosis in mice". Nature Communications. 8: 15781. doi:10.1038/ ... "Innate lymphoid cells - a proposal for uniform nomenclature". Nature Reviews Immunology. 13 (2): 145-149. doi:10.1038/nri3365. ...
Proponents of the concept have argued that the French defeat of 1940 was caused by what they regard as the innate decadence and ... Kennedy, Sean (2008). "The End of Immunity? Recent Work on the Far Right in Interwar France". Historical Reflections. 34 (2): ...
... a component of the inorganic armamentarium of innate immunity". Journal of Burns and Wounds. 6: e5. PMC 1853323. PMID 17492050 ...
In innate immunity, the MyD88 plays a pivotal role in immune cell activation through Toll-like receptors (TLRs), which belong ... Deguine J, Barton GM (2014-11-04). "MyD88: a central player in innate immune signaling". F1000Prime Reports. 6: 97. doi: ... and Immunity. 61: 326-339. doi:10.1016/j.bbi.2016.12.012. PMC 5453178. PMID 28007523. Wesche H, Gao X, Li X, Kirschning CJ, ... Infection and Immunity. 70 (3): 1272-8. doi:10.1128/IAI.70.3.1272-1278.2002. PMC 127773. PMID 11854210. Radons J, Gabler S, ...
"Nuocytes represent a new innate effector leukocyte that mediates type-2 immunity". Nature. 464 (7293): 1367-70. Bibcode: ... This cytokine is an important molecule controlling immunity of the gut and has been implicated in chronic inflammation ... Immunity. 42 (4): 692-703. doi:10.1016/j.immuni.2015.03.008. PMC 5811222. PMID 25888259. Iwakura Y, Ishigame H, Saijo S, Nakae ... Infection and Immunity. 84 (12): 3328-3337. doi:10.1128/IAI.00180-16. PMC 5116711. PMID 27620722. N.J., Fallon, Padraic G. ...
January 2007). "Aberrant innate immune response in lethal infection of macaques with the 1918 influenza virus". Nature. 445 ( ... most adults had substantial immunity. Later analysis found that the re-emergent strain had been circulating for approximately ...
... innate immunity Lorne Babiuk (1946-) Mike Belosevic (1951-) Kiril Bratanov (1911-1986), pioneer in the area of immunology of ... "for their discoveries concerning the activation of innate immunity" and Ralph Marvin Steinman (1943-2011)"for his discovery of ... organ-specific auto-immunity Eva Engvall (1940-), one of the scientists who invented ELISA in 1971. Anthony Fauci (1940-) ... the dendritic cell and its role in adaptive immunity" 2018 James P. Allison (1948-) and Tasuku Honjo (1942-), "for their ...
... the cells that produce cytokine IL-17 are extremely important in maintaining innate immunity. A comprehensive comparison of ... Th1-type cell-mediated immunity (CMI) is required for clearance of a fungal infection. Candida albicans is a kind of diploid ... Brown GD, Drummond RA, Gaffen SL, Hise AG (2015). "Innate Defense against Fungal Pathogens". Cold Spring Harb Perspect Med. 5 ( ... have been known to occasionally cause moderate-to-severe disease in human patients with compromised immunity. Cryptococcus ...
1] The 3 major types of innate and adaptive cell-mediated effector immunity [2] Innate lymphocytes-lineage, localization and ... Immune system Humoral immunity (vs. cell-mediated immunity) Immunity Janeway, Charles; Travers, Paul; Walport, Mark; Shlomchik ... Cellular immunity protects the body through: T-cell mediated immunity or T-cell immunity: activating antigen-specific cytotoxic ... Cell-mediated immunity is an immune response that does not involve antibodies. Rather, cell-mediated immunity is the activation ...
curehunter.com > beta-lysine Retrieved on April 18, 2010 IMMUNOLOGY - CHAPTER ONE > INNATE (NON-SPECIFIC) IMMUNITY Gene Mayer, ...
Santaolalla R, Abreu MT (2012). "Innate immunity in the small intestine". Curr Opin Gastroenterol. 28 (2): 124-9. doi:10.1097/ ... Cario, E (2010). "Heads up! How the intestinal epithelium safeguards mucosal barrier immunity through the inflammasome and ... The intestinal epithelium serves several crucial functions, exhibiting both innate and adaptive immune features. It closely ...
They have been shown to play significant roles in immunity and infection. Viral glycoproteins, a new class of cellular ... "Enveloped Viruses Disable Innate Immune Responses in Dendritic Cells by Direct Activation of TAM Receptors". Cell Host & ... inhibits the expression of cell surface proteins implicated in adaptive immunity. Being made up mostly of host membrane, the ...
... the prevailing of innate immunity, the failing of clonotypic immunity, and the filling of immunological space". Vaccine. 18 (16 ... Humoral immunity declines, caused by a reduction in the population of antibody producing B-cells along with a smaller ... Weng NP (May 2006). "Aging of the immune system: how much can the adaptive immune system adapt?". Immunity. 24 (5): 495-499. ... A 2020 review concluded that the adaptive immune system is affected more than the innate immune system. Immunosenescence ...
Infectious immunity in the central nervous system and brain function. Klein RS, Garber C, Howard N. Nature Immunology. 2017 Feb ... She found that microglia, the brain's innate immune cells, accumulate around neurons at the site of infection and complement ...
... tyrosine kinase 2 deficiency reveals its requisite roles in multiple cytokine signals involved in innate and acquired immunity ... Syndromes affecting immunity, Pediatrics, Transcription factor deficiencies, IUIS-PID table 3 immunodeficiencies, Noninfectious ... ". Immunity. 25 (5): 745-55. doi:10.1016/j.immuni.2006.09.009. PMID 17088085. Kreins AY, Ciancanelli MJ, Okada S, Kong XF, ...
Part I Stabilized hypochlorous acid: a component of the inorganic armamentarium of innate immunity". J Burns and Wounds 2007; ... Infection and Immunity. 66 (6): 2655-9. doi:10.1128/IAI.66.6.2655-2659.1998. PMC 108252. PMID 9596730. Winter, J.; Ilbert, M.; ... Infection and Immunity. 55 (10): 2518-25. doi:10.1128/IAI.55.10.2518-2525.1987. PMC 260739. PMID 2820883. Camper, AK; McFeters ...
Innate and adaptive immune responses of the central nervous system. Critical Reviews in Immunology. 26, 149-188. Hauser S.L.; ... Depression and Immunity: Inflammation and Depressive Symptoms in Multiple Sclerosis. 29, 309. Gaikwad, Sagar; Agrawal-Rajput, ... Other evidence has shown that development and deployment of the innate and acquired immune systems in response to stressors on ... The nervous system is under constant monitoring from both the adaptive and innate immune system. Throughout development and ...
Box 1. Antimicrobial peptides involved in vaginal innate immunity. Major antimicrobial peptides found in the vagina *. α- ... Box 2. Cellular components of the vaginal innate immune system. Cellular components of the vaginal innate immune system *. ... Vaginal immunity depends greatly on the maintenance of homeostasis among all components in the innate immune system. ... Vaginal Innate Immunity. Alteration During Pregnancy and its Impact on Pregnancy Outcomes. ...
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Sebaceous immunobiology - skin homeostasis, pathophysiology, coordination of innate immunity and inflammatory response and ... Sebocytes behave as potent immune regulators, integrating into the innate immune responses of the skin. Expressing inflammatory ... 5 Laboratory for Innate Immune Systems, RIKEN Center for Integrative Medical Sciences (IMS), Yokohama, Kanagawa, Japan. ... are markedly involved in the skin barrier function and perifollicular and dermal innate immune processes, leading to ...
"When we look at innate immunity, both markers lead to an increased risk of stroke," Fani said. "As the markers increase over ... Cite this: Overactive Innate Immunity Tied to Higher Stroke Risk - Medscape - Jun 18, 2019. ... MILAN - Higher levels of components of innate immunity, such as granulocytes and platelets, and larger ratios of these markers ... "We saw that in younger individuals, the risk was slightly higher for incident stroke when the innate immunity components ...
Innate Immunity and Paediatric Gastroenterology - A Special Issue published by Hindawi ... Innate immunity also seems to be involved in other maternal and gestational concerns with a great impact on birth outcomes. ... Innate immunity represents a current research trend in a wide spectrum of medical fields. Paediatric gastroenterological ... Innate immunity responses are involved in the development of both gastroenterological infectious disorders, such Helicobacter ...
... innate immunity, innate sensor, interferon gamma, MDA5, memory T cells, neutrophil, RIG-I, SARS-CoV-2 ... Filed Under: Basic virology, Information Tagged With: dsRNA, IFN, innate immunity, interferon, lncRNA, long non-coding RNA, RIG ... Filed Under: Basic virology, Gertrud Rey, Information Tagged With: animal model, dengue virus, innate immunity, interferon, ... Filed Under: Basic virology, Information Tagged With: dsRNA, innate immunity, interferon, interferonopathy, MDA5, mitochondria ...
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A broader role for the microbiota as a major modulator of systemic immunity has been proposed; however, evidence and a ... Recognition of peptidoglycan from the microbiota by Nod1 enhances systemic innate immunity Nat Med. 2010 Feb;16(2):228-31. doi ... A broader role for the microbiota as a major modulator of systemic immunity has been proposed; however, evidence and a ... We show that the microbiota are a source of peptidoglycan that systemically primes the innate immune system, enhancing killing ...
Recognition of cytosolic DNA activates an IRF3-dependent innate immune response.. Immunity. 2006; 24: 93-103. View in Article * ... DNA damage and innate immunity: links and trade-offs. *. Georgia Chatzinikolaou. Georgia Chatzinikolaou ... Toll-like receptors and their crosstalk with other innate receptors in infection and immunity. ... DNA-PK is a DNA sensor for IRF-3-dependent innate immunity. ... Previous ArticleAntiviral innate immunity and stress granule ...
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... in the regulation of host innate immunity and have revealed mechanisms by which FMDV proteins mediate host innate immunity. In ... In this review, the advance in mechanisms of interaction be-tween FMDV proteins and hosts innate immunity are summarized to ... advances in studies on the mechanisms of interaction between FMDV proteins and host innate immunity are summarized to provide a ... In addition, studies have shown that many FMDV proteins are involved in the regulation of host innate immunity and re-vealed ...
Natural defense mechanism of the body (innate immunity) plays a key role in the fight against COVID-19 and other viral ... CSIR to repurpose Sepsivac drug to enhance innate immunity against COVID-19. By ... to enhance innate immunity of the body to limit the spread of COVID-19 and fasten the recovery of the patients of COVID-19, ... COVID-19 or other viruses either do not get the disease or get a milder form of the self-limiting disease as Innate immunity is ...
Innate Immunity MOOC. This MOOC describes the players and the whole orchestra involved in innate immunity against pathogens. ... What was called "non-specific immunity" was renamed "innate immunity", and the understanding of the sensing of the exogenous or ... Present links between innate immunity and the central nervous system and adaptive immunity.. ... Define the cellular and molecular players of innate immunity.. *Describe the mechanisms that lead to the elimination of ...
Jonathan Ewbank on Antifungal innate immunity in C. elegans, part of a collection of multimedia lectures. ... An introduction to veterinary immunology: innate immunity An introduction to veterinary immunology: innate immunity ... Ewbank, J. (2018, February 28). Antifungal innate immunity in C. elegans [Video file]. In The Biomedical & Life Sciences ... explored and so is complementary to other models used to investigate innate immunity. ...
View the Joseph Sun Lab page for Harnessing Innate Immunity in Cancer Therapies: The Example of Natural Killer Cell Engagers. ... Harnessing Innate Immunity in Cancer Therapies: The Example of Natural Killer Cell Engagers Share * ...
Human T-bet deficiency thus underlies mycobacterial disease by preventing the development of innate (NK) and innate-like ... immunity underlie mycobacterial disease. We report a patient with mycobacterial disease due to inherited deficiency of the ... Human T-bet Governs Innate and Innate-like Adaptive IFN-γ Immunity against Mycobacteria Rui Yang 1 Federico Mele 2 Lisa Worley ... Human T-bet Governs Innate and Innate-like Adaptive IFN-γ Immunity against Mycobacteria. Cell, 2020, 183 (7), pp.1826-1847.e31 ...
Protein recognition of small RNAs in innate immunity. *Williams, Bryan (Primary Chief Investigator (PCI)) ...
Modulation of innate immunity by the cGMP signalling pathway in the drosophila malpighian tubule ... The Drosophila innate immune system is one of the most widely characterised of all metozoan defense systems, and shares many ... of choice for many researchers with regards to the study of the general mechanisms and regulatory elements of innate immunity. ... similar characteristics to the innate immune systems of higher organisms. As such, Drosophila has become the model organism ...
Data from: Rapid seasonal evolution in innate immunity of wild Drosophila melanogaster. Behrman, Emily L., University of ... 2018), Data from: Rapid seasonal evolution in innate immunity of wild Drosophila melanogaster, Dryad, Dataset, https://doi.org/ ...
16:00 Innate immunity and the host response Mihai Netea, Nijmegen. 16:25 Consequences and infectious complications Eric Bow, ... U bent hier: Home / Congressen / Mucosal barrier injury, innate immunity and infection ...
Downloading a figure as powerpoint requires a browser with javascript support. Enable javascript and try again For help please contact [email protected] ...
Training Innate Respiratory Immunity to protect against pandemic viral infection. *Zimmermann, Julie (PhD Student) ...
To be clear, these are two selected examples of many by which SARS-CoV-2 disrupts the host machinery to evade innate immunity ... USP18 positively regulates innate antiviral immunity by promoting K63-linked polyubiquitination of MAVS. Nat Commun. 2021;12(1 ... Innate immunity utilizes pattern recognition receptors to recognize pathogen-associated molecular proteins (PAMPs) of the ... Interestingly, several key innate immunity signaling cascades utilize post-translational modifications as regulatory mechanisms ...
STAT3-mediated upregulation of the AIM2 DNA sensor links innate immunity with cell migration to promote epithelial ... STAT3-mediated upregulation of the AIM2 DNA sensor links innate immunity with cell migration to promote epithelial ...
Role of Toll-like receptor-driven innate immunity in thoracic organ transplantation. ... these studies demonstrate that innate immunity is important for alloimmunity. Future therapeutic modalities that target innate ... Innate immunity represents the first line of defense against microbial invasion. Recent studies have determined that a group of ... Role of Toll-like receptor-driven innate immunity in thoracic organ transplantation. Journal Article (Journal Article;Review) ...
Self-killing of melanoma cells by cytosolic delivery of dsRNA: Wiring innate immunity for a coordinated mobilization of ...
View the Joseph Sun Lab page for Innate Immunity Receptors: Crosstalk with Adaptive Immunity, Cancer and Microbiota. ...
Innate Immunity, Porphyromonas gingivalis". 0-9. A. B. C. D. E. F. G. H. I. J. K. L. M. N. O. P. Q. R. S. T. U. V. W. X. Y. Z. ...
Transcriptome analyses reveal SR45 to be a neutral splicing regulator and a suppressor of innate immunity in Arabidopsis ...
Exosomes secreted by nematode parasites transfer small RNAs to mammalian cells and modulate innate immunity. ...
  • Neutrophils are an essential part of the innate immune system because they accumulate quickly at a site of infection, where they ingest pathogens and recruit and activate other immune cells. (virology.ws)
  • Sentinel cells of the innate immune system recognize invading pathogens by sensing structurally conserved molecular motifs in infectious microbes. (virology.ws)
  • We show that the microbiota are a source of peptidoglycan that systemically primes the innate immune system, enhancing killing by bone marrow-derived neutrophils of two major pathogens: Streptococcus pneumoniae and Staphylococcus aureus. (nih.gov)
  • Adaptive and innate immune mechanisms are often directed outward, protecting self against pathogens. (cell.com)
  • The innate immune system is the first line of defense against pathogens and plays a crucial role in controlling pathogen infection ( Yoneyama and Fujita, 2010 ). (frontiersin.org)
  • This MOOC describes the players and the whole orchestra involved in innate immunity against pathogens. (pasteur.fr)
  • What was called "non-specific immunity" was renamed "innate immunity", and the understanding of the sensing of the exogenous or endogenous dangers signals, and their identification revolutionized our understanding of the early mechanism aimed to defend the integrity of the host against any type of attacks including pathogens. (pasteur.fr)
  • Innate immunity is critical for all organisms against microbial pathogens. (uwyo.edu)
  • The high burden of infectious diseases and the extensive vaccination campaigns previously conducted in Africa could have induced specific and non-specific protective immunity to infectious pathogens in Africans. (bvsalud.org)
  • The vaginal innate immune system represents the first line of defense against foreign organisms and pathogenic microbes. (medscape.com)
  • The vaginal innate immune system plays a critical role in defense against all sexually transmitted diseases including HIV. (medscape.com)
  • These data establish a mechanism for systemic immunomodulation by the microbiota and highlight potential adverse consequences of microbiota disruption by broad-spectrum antibiotics on innate immune defense to infection. (nih.gov)
  • Natural defense mechanism of the body (innate immunity) plays a key role in the fight against COVID-19 and other viral infections. (tehelka.com)
  • The Drosophila innate immune system is one of the most widely characterised of all metozoan defense systems, and shares many similar characteristics to the innate immune systems of higher organisms. (bl.uk)
  • Proper activation of the innate immune system functions as the first line of defense for host cells and can lead to suppression of viral replication. (cytoskeleton.com)
  • Innate immunity represents the first line of defense against microbial invasion. (duke.edu)
  • Innate, or nonspecific, immunity is the defense system with which you were born. (medlineplus.gov)
  • As the name implies, innate immunity is something people are born with and the first line of defense they have when encountering a new virus. (cdc.gov)
  • Natural killer (NK) cells function as early effector cells in the innate immune defense against viral infections and also participate in the regulation of normal and malignant hematopoiesis. (researchmap.jp)
  • Granulocytes are a key component of the innate immune system (ie, nonspecific immune defense system). (medscape.com)
  • However, during most of the XXth century, adaptive immunity (also known as specific immunity) focused most of the interest of the researchers, until Charles Janeway and Polly Matzinger revisited the definition of immunology. (pasteur.fr)
  • This review provides an insight into the benefits of fever and its role in prevention of cancer, the significance of common infections in cancer regression, the dual nature of our immune system and the role of the often overlooked primary innate immunity in tumor immunology and spontaneous regression of cancer. (who.int)
  • Passive immunity is due to antibodies that are produced in a body other than your own. (medlineplus.gov)
  • Infants have passive immunity because they are born with antibodies that are transferred through the placenta from their mother. (medlineplus.gov)
  • This could be due to antibodies that were made against some other immunogen but cross-reacted with Ebola virus, by innate immunity proteins in their blood, or both. (cdc.gov)
  • Immune cells like the natural killer cells, macrophages and dendritic cells have taken greater precedence in cancer immunity than ever before. (who.int)
  • Other cellular components of the innate immune system include mononuclear phagocytes, dendritic cells, and NK cells. (medscape.com)
  • Moreover, it has been found that the maternal microbiota might be involved in shaping postnatal immunity. (hindawi.com)
  • Postnatal immunity responses seem to be influenced by other environmental factors including gastrointestinal microbiota. (hindawi.com)
  • The main aim of this Special Issue is to define an integrative mechanistic model for a clearer understanding of the relationship between innate immunity and paediatric gastroenterological diseases, along with other factors, such as maternal microbiota or gestational pathologies. (hindawi.com)
  • Innate immunity and intestinal microbiota in the development of Type 1 diabetes. (ifh-homehygiene.org)
  • Although recent progress, a proper characterization of mucosal innate immune response and microbiota is still missing, and further studies are needed to understand how they can be helpful for the formulation of an effective vaccine . (bvsalud.org)
  • This type of innate immune response seems to be delayed in older adults, and in an effort to "catch up," may result in excessive inflammation, thereby ultimately causing more severe damage. (virology.ws)
  • Conversely, lack of chronic innate inflammation at baseline may predict improved treatment outcome, as suggested by good overall prognosis. (unina.it)
  • 12-Lipoxygenase governs the innate immune pathogenesis of islet inflammation and autoimmune diabetes. (uchicago.edu)
  • Surfactant proteins (SP) reduce alveolar surface tension and modulate innate immune responses to control lung inflammation. (cdc.gov)
  • Binding of complement to a foreign substance, or antigen, amplifies and augments the body's innate immune system by means of its role as an opsonin (a factor that enhances phagocytosis of unwanted particles) and as a chemoattractant (a factor that recruits cells to areas of inflammation). (medscape.com)
  • The increased numbers of innate immune cells and increased expression of pattern recognition receptor genes in the upper airways of children may facilitate a more efficient innate response to SARS-CoV-2 infection, leading to reduced viral replication and faster clearance of virus. (virology.ws)
  • Nod1(-/-) mice are more susceptible than wild-type mice to early pneumococcal sepsis, demonstrating a role for Nod1 in priming innate defenses facilitating a rapid response to infection. (nih.gov)
  • The haptoglobin-haemoglobin receptor (HpHbR) of African trypanosomes allows acquisition of haem and provides an uptake route for trypanolytic factor-1, a mediator of innate immunity against trypanosome infection. (ox.ac.uk)
  • Repeated exposures occur from birth to old age, but natural and/or vaccine-induced immunity renders the majority of infections mild or asymptomatic following natural infection or vaccination. (cdc.gov)
  • Human Immunodeficiency Virus ( HIV ) is still one of the major global health issues, and despite significant efforts that have been put into studying the pathogenesis of HIV infection , several aspects need to be clarified, including how innate immunity acts in different anatomical compartments. (bvsalud.org)
  • Given this scenario, we focused our attention on the interplay between HIV and mucosal innate response the different mucosae act as a physical barrier , whose integrity can be compromised by the infection , and the virus - cell interaction induces the innate immune response . (bvsalud.org)
  • The outcome of the ensuing battle will determine whether the infection will remain locally limited within the engulfing cells of the innate immune system, or will continue to spread, causing the individual to become a clinically active TB patient [ 1 , 6 , 7 , 8 ]. (intechopen.com)
  • One explanation is that a child's innate immune system mounts a more vigorous attack at the onset of infection. (forbes.com)
  • To provide insight into the possible reasons for the presumed immune sufficiency to coronavirus disease 2019 (COVID-19) in Africa, this review critically examines literature published from 2020 onwards on the dynamics of COVID-19 infection and immunity and how other prevalent infectious diseases in Africa might have influenced the outcome of COVID-19. (bvsalud.org)
  • Along this line and based on the critical role of innate immunity in all immune responses, targeting innate immunity in cancer opens the possibility to mount a multilayered immune response culminating in long-lasting antitumor immunity. (perkinelmer.com)
  • Researchers at The University of Texas MD Anderson Cancer Center have developed an ultrasound-guided cancer immunotherapy platform that generates systemic antitumor immunity and improves the therapeutic efficacy of immune checkpoint blockade. (mdanderson.org)
  • My research focuses on understanding the balance between protective antitumor immunity and immunotherapy toxicities. (harvard.edu)
  • In addition, studies have shown that many FMDV proteins are involved in the regulation of host innate immunity and have revealed mechanisms by which FMDV proteins mediate host innate immunity. (frontiersin.org)
  • In this review, advances in studies on the mechanisms of interaction between FMDV proteins and host innate immunity are summarized to provide a comprehensive understanding of FMDV pathogenesis and the theoretical basis for FMD prevention and control. (frontiersin.org)
  • Tara Hurst and Gkikas Magiorkinis have written a review in the Journal of General Virology discussing how ERVs activate innate immune sensing pathways and the potential implications for human disease. (applevir.org)
  • This session will be focusing on the dissection of the role of innate immune cells and their clinical manipulation in cancer. (perkinelmer.com)
  • Acute activation of myeloid cells induced itaconate synthesis, which subsequently mediated innate immune tolerance in human monocytes. (diagenode.com)
  • Malik A, Jabri B. Innate riddle of CD4+ T cells and the control of enteric infections. (uchicago.edu)
  • As the first-of-its-kind platform, the Microbubble-assisted UltraSound-guided Immunotherapy of Cancer (MUSIC) approach employs nanocomplexes combined with microbubbles to effectively deliver cyclic guanosine monophosphate-adenosine monophosphate (cGAMP), an immunotransmitter involved in anticancer immunity, into antigen-presenting cells (APCs). (mdanderson.org)
  • Innate immunity consists of cells and molecules that offer a level of protection against a variety of viruses by recognizing structures these viruses have in common. (cdc.gov)
  • We have previously shown that NK cells function as major cytotoxic effector cells in vaccine-induced immune protection against Friend virus (FV)-induced leukemia, and NK cell depletion totally abrogates the above protective immunity. (researchmap.jp)
  • Mast cells in innate immunity. (bvsalud.org)
  • Innate immunity resides in the skin, mucous membranes, polymorphonuclear (PMN) cells, complement system, and a select group of cells that possess cytotoxic capabilities. (medscape.com)
  • Natural-killer (NK) cells are specialized lymphocytes that have cytotoxic properties in addition to their ability to produce cytokines that assist in the orchestration of adaptive immunity. (medscape.com)
  • NK cells are specialized effectors of the innate immune system that destroy their targets by antibody-dependent cell-mediated cytotoxicity, have prominent antitumor effects, and are potent killers of virally infected cells. (medscape.com)
  • The existence of a relationship between innate immunity mechanisms (e.g. toll-like receptors) and the onset of certain gastroenterological pathologies is undoubtable, but a more thorough approach in this topic would be extremely useful to understand clearly the mechanistic pathways and to create a solid basis for potential prevention or treatment strategies. (hindawi.com)
  • As such, Drosophila has become the model organism of choice for many researchers with regards to the study of the general mechanisms and regulatory elements of innate immunity. (bl.uk)
  • Interestingly, several key innate immunity signaling cascades utilize post-translational modifications as regulatory mechanisms and are often hijacked by viruses to evade immune detection (3) . (cytoskeleton.com)
  • Future therapeutic modalities that target innate rather than adaptive immune mechanisms represent a promising avenue for future studies in thoracic organ transplantation. (duke.edu)
  • Genomic and Transcriptional Mechanisms Governing Innate-like T Lymphocyte Development. (uchicago.edu)
  • To cite this article: Martin SF, Esser PR, Weber FC, Jakob T, Freudenberg MA, Schmidt M, Goebeler M. Mechanisms of chemical-induced innate immunity in allergic contact dermatitis. (cdc.gov)
  • By investigating the mechanisms of action in producing a robust STING activation, we identified a new strategy to activate both the innate and adaptive antitumor immune responses," said Wen Jiang, M.D., Ph.D. , assistant professor of Radiation Oncology and the study's co-senior author. (mdanderson.org)
  • The initial interplay between HIV and mucosal innate immunity. (bvsalud.org)
  • Given the nature of HIV as a sexually transmitted disease , one of the aspects that demands particular attention is the mucosal innate immune response . (bvsalud.org)
  • The innate immune system - the nonspecific portion of the immune response - is well represented within this environment. (medscape.com)
  • Innate immunity is relatively nonspecific. (medscape.com)
  • Innate immunity also comes in a protein chemical form, called innate humoral immunity. (medlineplus.gov)
  • As a consequence, research focused on understanding the molecular and cellular basis of antifungal immunity has expanded tremendously in the last few years. (elsevier.com)
  • This review will provide an overview of the most exciting recent advances in innate antifungal immunity, discoveries that are helping to pave the way for the development of new strategies that are desperately needed to combat these devastating diseases. (elsevier.com)
  • Salazar, F & Brown, GD 2018, ' Antifungal innate immunity: a perspective from last 10 years ', Journal of Innate Immunity , vol. 10, pp. 373-397. (elsevier.com)
  • Although the majority of cancer immunotherapies have focused on boosting the adaptive branch of the body's immune system, there has been a growing realization that both the innate and adaptive branches of the body's immune system need to be engaged to generate optimal antitumoral immunity," Jiang said. (mdanderson.org)
  • Immunity refers to our body's defences. (imunobran.lu)
  • Interferon (IFN) production plays a pivotal role in the host antiviral innate immune response, which can suppress viral replication especially in the early stage of the immune response. (frontiersin.org)
  • This finding can possibly be attributed to the "trained" immunity resulting from more frequent respiratory infections in children, which increases the baseline or standard innate activity in children. (forbes.com)
  • Role of eosinophils, neutrophils and macrophages in innate and adaptive immunity to nematode infections. (jefferson.edu)
  • A rare genetic primary immunodeficiency due to a defect in innate immunity disorder with characteristics of impaired intracellular signaling from both type I and type II interferons, leading to early-onset, severe, life-threatening intracellular bacterial (typically mycobacteria) and viral (mainly herpes viruses) infections. (cdc.gov)
  • Innate immunity responses are involved in the development of both gastroenterological infectious disorders, such Helicobacter pylori-induced gastritis, and autoimmune disorders, such as celiac disease or inflammatory bowel disorders. (hindawi.com)
  • E-mail: [email protected] involved in anti-infectious immunity. (cdc.gov)
  • What is natural immunity and how does it work? (imunobran.lu)
  • Many pathways have been identified as being key to innate immunity regulation. (uwyo.edu)
  • Recently a G protein coupled receptor, FSHR-1, was identified as being important to the function of innate immunity of the nematode Caenorhabditis elegans. (uwyo.edu)
  • The majority of persons coming in contact with COVID-19 or other viruses either do not get the disease or get a milder form of the self-limiting disease as Innate immunity is adequate. (tehelka.com)
  • Immunity against viruses (and bacteria) has two principal components: innate and adaptive. (cdc.gov)
  • However, the study of immunity, particularly in the elderly, can no longer be limited to efficacy of vaccination, given the emergence of new viral strains of common viruses, such as avian influenza, and the threat of using viruses to which there are no current vaccines as agents of bioterrorism. (msu.edu)
  • Role of Toll-like receptor-driven innate immunity in thoracic organ transplantation. (duke.edu)
  • Structural basis for ligand and innate immunity factor uptake by the trypanosome haptoglobin-haemoglobin receptor. (ox.ac.uk)
  • The conference "Novel Concepts in Innate Immunity" was first held 2015 in Tübingen in commemoration of the 30th anniversary of the discovery of the Toll receptor gene in Tübingen and now takes place every two years. (immunology-tuebingen.de)
  • Learn about PathHunter® checkpoint receptor assays (cell lines and bioassays) for innate and adaptive immunity. (discoverx.com)
  • Recent studies have determined that a group of germline-encoded receptors, termed Toll-like receptors (TLRs), are critical for recognizing foreign motifs on microbial organisms and initiating innate responses. (duke.edu)
  • Innate immune recognition sensing by these receptors are not non-specific. (applevir.org)
  • Fcγ-receptors play a critical role in triggering the adapted immune system, and a lower activation provides a less robust cell immunity response. (forbes.com)
  • RAF1 & Immunity: A Future Model For Cancer Research? (bellbrooklabs.com)
  • Methods: To identify genetic markers for meningioma in genes involved with innate immunity, we conducted an exploratory association study of 101 meningioma cases and 330 frequency-matched controls of European ancestry using subjects from a hospital-based study conducted by the National Cancer Institute. (elsevier.com)
  • IMSEAR at SEARO: The role of innate immunity in spontaneous regression of cancer. (who.int)
  • Thomas J A, Badini M. The role of innate immunity in spontaneous regression of cancer. (who.int)
  • New techniques involving DNA analysis have also expanded understanding of the complex vaginal flora and its intricate role in local immunity. (medscape.com)
  • Unlike the cardiology field, where multiple trials point to the involvement of innate immunity in the inflammatory hypothesis of atherosclerosis, "the role of innate immunity for developing stroke remains unknown," Fani and colleagues note. (medscape.com)
  • While symptoms vary widely throughout the population there is growing evidence that the innate immune response plays a crucial role in determining the severity of COVID-19 (1, 2) . (cytoskeleton.com)
  • The role of itaconate was further validated by IRG1 and SDH polymorphisms that modulate induction of tolerance and trained immunity in human monocytes. (diagenode.com)
  • DNA damage sensors and the DDR are coupled to innate immune activation. (cell.com)
  • Collectively, these data suggest that activation of several functions of the innate immunity before treatment is associated with inferior survival in patients treated with oncolytic adenovirus. (unina.it)
  • Aged mice also exhibit altered innate immunity, including a decrease in inducible natural killer (NK) cell activity, although such changes have not been consistent in humans. (msu.edu)
  • MILAN - Higher levels of components of innate immunity, such as granulocytes and platelets, and larger ratios of these markers to lymphocytes were associated with greater stroke risk over time in a large prospective cohort study. (medscape.com)
  • This understanding has led to the development of new immunotherapies that target the regulators of innate immune systems, including the cGAS-STING pathway. (mdanderson.org)
  • In either case, innate immune signaling via TLRs leads to a productive adaptive immune response. (duke.edu)
  • Sebocytes behave as potent immune regulators, integrating into the innate immune responses of the skin. (nih.gov)
  • Most studies have shown that TLR-dependent immune function leads to T-helper 1 (TH1) immunity, although evidence also supports that TH2 immune responses may be initiated by TLR signaling in certain contexts. (duke.edu)
  • Cannabidiol inhibits SARS-CoV-2 replication through induction of the host ER stress and innate immune responses. (uchicago.edu)
  • reviewed antiviral immune responses in bats and suggested the possibility that bats might be able to control viral replication through innate immunity. (cdc.gov)
  • As expected, adaptive immunity has a more protective effect on stroke risk," Fani said. (medscape.com)
  • Adaptive immunity, on the other hand, can learn to recognize and remember the exact invading virus and in doing so, become a strong protective force to stop it from causing disease. (cdc.gov)
  • Microbial invaders often have distinct molecular patterns (referred to as pathogen associated molecular patterns, or PAMPs) that are quickly recognised by host innate immune defences. (applevir.org)
  • In contrast, induction of trained immunity by b-glucan counteracted tolerance induced in a model of human endotoxemia by inhibiting the expression of immune-responsive gene 1 (IRG1), the enzyme that controls itaconate synthesis. (diagenode.com)
  • Contact allergen-induced innate immunity contrast to irritant contact dermatitis (ICD), which evolves emollients may help reduce irritancy and stabilize the barrier as a consequence of direct toxic effects of physical or chemi- function of the skin avoiding the penetration of contact aller- cal agents resulting in keratinocyte damage and local inflam- gens. (cdc.gov)
  • In contrast to basic innate immunity, adaptive immunity is specific and depends on antigenic stimulation. (medscape.com)
  • Acquired immunity is immunity that develops with exposure to various antigens. (medlineplus.gov)
  • Conclusions and Impact: Our results indicate that common genetic polymorphisms in innate immunity genes may be associated with risk of meningioma. (elsevier.com)
  • These genetic findings provide additional evidence that the microglia-mediated innate immune response contributes directly to the development of Alzheimer's disease. (ntu.ac.uk)
  • found that flight evolved in tandem with concomitant genetic changes to their innate immune systems. (cdc.gov)
  • The 2019 conference featured several exciting sessions on various aspects of Innate Immunity, presented by internationally acclaimed speakers. (immunology-tuebingen.de)