Coated pits cell membrane. Medical search

Lining of the STOMACH, consisting of an inner EPITHELIUM, a middle LAMINA PROPRIA, and an outer MUSCULARIS MUCOSAE. The surface cells produce MUCUS that protects the stomach from attack by digestive acid and enzymes. When the epithelium invaginates into the LAMINA PROPRIA at various region of the stomach (CARDIA; GASTRIC FUNDUS; and PYLORUS), different tubular gastric glands are formed. These glands consist of cells that secrete mucus, enzymes, HYDROCHLORIC ACID, or hormones.

Specialized regions of the cell membrane composed of pits coated with a bristle covering made of the protein CLATHRIN. These pits are the entry route for macromolecules bound by cell surface receptors. The pits are then internalized into the cytoplasm to form the COATED VESICLES.

The lipid- and protein-containing, selectively permeable membrane that surrounds the cytoplasm in prokaryotic and eukaryotic cells.

The main structural coat protein of COATED VESICLES which play a key role in the intracellular transport between membranous organelles. Each molecule of clathrin consists of three light chains (CLATHRIN LIGHT CHAINS) and three heavy chains (CLATHRIN HEAVY CHAINS) that form a structure called a triskelion. Clathrin also interacts with cytoskeletal proteins.

Cellular uptake of extracellular materials within membrane-limited vacuoles or microvesicles. ENDOSOMES play a central role in endocytosis.

Thin layers of tissue which cover parts of the body, separate adjacent cavities, or connect adjacent structures.

Lipids, predominantly phospholipids, cholesterol and small amounts of glycolipids found in membranes including cellular and intracellular membranes. These lipids may be arranged in bilayers in the membranes with integral proteins between the layers and peripheral proteins attached to the outside. Membrane lipids are required for active transport, several enzymatic activities and membrane formation.

Thin structures that encapsulate subcellular structures or ORGANELLES in EUKARYOTIC CELLS. They include a variety of membranes associated with the CELL NUCLEUS; the MITOCHONDRIA; the GOLGI APPARATUS; the ENDOPLASMIC RETICULUM; LYSOSOMES; PLASTIDS; and VACUOLES.

The motion of phospholipid molecules within the lipid bilayer, dependent on the classes of phospholipids present, their fatty acid composition and degree of unsaturation of the acyl chains, the cholesterol concentration, and temperature.

The voltage differences across a membrane. For cellular membranes they are computed by subtracting the voltage measured outside the membrane from the voltage measured inside the membrane. They result from differences of inside versus outside concentration of potassium, sodium, chloride, and other ions across cells' or ORGANELLES membranes. For excitable cells, the resting membrane potentials range between -30 and -100 millivolts. Physical, chemical, or electrical stimuli can make a membrane potential more negative (hyperpolarization), or less negative (depolarization).

Cytoplasmic vesicles formed when COATED VESICLES shed their CLATHRIN coat. Endosomes internalize macromolecules bound by receptors on the cell surface.

Microscopy using an electron beam, instead of light, to visualize the sample, thereby allowing much greater magnification. The interactions of ELECTRONS with specimens are used to provide information about the fine structure of that specimen. In TRANSMISSION ELECTRON MICROSCOPY the reactions of the electrons that are transmitted through the specimen are imaged. In SCANNING ELECTRON MICROSCOPY an electron beam falls at a non-normal angle on the specimen and the image is derived from the reactions occurring above the plane of the specimen.

The semi-permeable outer structure of a red blood cell. It is known as a red cell 'ghost' after HEMOLYSIS.

A quality of cell membranes which permits the passage of solvents and solutes into and out of cells.

Artificially produced membranes, such as semipermeable membranes used in artificial kidney dialysis (RENAL DIALYSIS), monomolecular and bimolecular membranes used as models to simulate biological CELL MEMBRANES. These membranes are also used in the process of GUIDED TISSUE REGENERATION.

A family of large adaptin protein subunits of approximately 100 kDa in size. They have been primarily found as components of ADAPTOR PROTEIN COMPLEX 2.

Vesicles formed when cell-membrane coated pits (COATED PITS, CELL-MEMBRANE) invaginate and pinch off. The outer surface of these vesicles is covered with a lattice-like network of the protein CLATHRIN. Shortly after formation, however, the clathrin coat is removed and the vesicles are referred to as ENDOSOMES.

An adaptor protein complex primarily involved in the formation of clathrin-related endocytotic vesicles (ENDOSOMES) at the CELL MEMBRANE.

Established cell cultures that have the potential to propagate indefinitely.

A family of high molecular weight GTP phosphohydrolases that play a direct role in vesicle transport. They associate with microtubule bundles (MICROTUBULES) and are believed to produce mechanical force via a process linked to GTP hydrolysis. This enzyme was formerly listed as EC 3.6.1.50.

A darkly stained mat-like EXTRACELLULAR MATRIX (ECM) that separates cell layers, such as EPITHELIUM from ENDOTHELIUM or a layer of CONNECTIVE TISSUE. The ECM layer that supports an overlying EPITHELIUM or ENDOTHELIUM is called basal lamina. Basement membrane (BM) can be formed by the fusion of either two adjacent basal laminae or a basal lamina with an adjacent reticular lamina of connective tissue. BM, composed mainly of TYPE IV COLLAGEN; glycoprotein LAMININ; and PROTEOGLYCAN, provides barriers as well as channels between interacting cell layers.

An iron-binding beta1-globulin that is synthesized in the LIVER and secreted into the blood. It plays a central role in the transport of IRON throughout the circulation. A variety of transferrin isoforms exist in humans, including some that are considered markers for specific disease states.

Microscopy in which the samples are first stained immunocytochemically and then examined using an electron microscope. Immunoelectron microscopy is used extensively in diagnostic virology as part of very sensitive immunoassays.

Preparation for electron microscopy of minute replicas of exposed surfaces of the cell which have been ruptured in the frozen state. The specimen is frozen, then cleaved under high vacuum at the same temperature. The exposed surface is shadowed with carbon and platinum and coated with carbon to obtain a carbon replica.

Glycoproteins found on the membrane or surface of cells.

The engulfing of liquids by cells by a process of invagination and closure of the cell membrane to form fluid-filled vacuoles.

Cell surface proteins that bind signalling molecules external to the cell with high affinity and convert this extracellular event into one or more intracellular signals that alter the behavior of the target cell (From Alberts, Molecular Biology of the Cell, 2nd ed, pp693-5). Cell surface receptors, unlike enzymes, do not chemically alter their ligands.

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.

The process in which substances, either endogenous or exogenous, bind to proteins, peptides, enzymes, protein precursors, or allied compounds. Specific protein-binding measures are often used as assays in diagnostic assessments.

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 process of moving proteins from one cellular compartment (including extracellular) to another by various sorting and transport mechanisms such as gated transport, protein translocation, and vesicular transport.

A complex of polyene antibiotics obtained from Streptomyces filipinensis. Filipin III alters membrane function by interfering with membrane sterols, inhibits mitochondrial respiration, and is proposed as an antifungal agent. Filipins I, II, and IV are less important.

Theoretical representations that simulate the behavior or activity of biological processes or diseases. For disease models in living animals, DISEASE MODELS, ANIMAL is available. Biological models include the use of mathematical equations, computers, and other electronic equipment.

Microscopy of specimens stained with fluorescent dye (usually fluorescein isothiocyanate) or of naturally fluorescent materials, which emit light when exposed to ultraviolet or blue light. Immunofluorescence microscopy utilizes antibodies that are labeled with fluorescent dye.

Minute projections of cell membranes which greatly increase the surface area of the cell.

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.

A replica technique in which cells are frozen to a very low temperature and cracked with a knife blade to expose the interior surfaces of the cells or cell membranes. The cracked cell surfaces are then freeze-dried to expose their constituents. The surfaces are now ready for shadowing to be viewed using an electron microscope. This method differs from freeze-fracturing in that no cryoprotectant is used and, thus, allows for the sublimation of water during the freeze-drying process to etch the surfaces.

The rate dynamics in chemical or physical systems.

Layers of lipid molecules which are two molecules thick. Bilayer systems are frequently studied as models of biological membranes.

Membrane glycoproteins found in high concentrations on iron-utilizing cells. They specifically bind iron-bearing transferrin, are endocytosed with its ligand and then returned to the cell surface where transferrin without its iron is released.

The tendency of a gas or solute to pass from a point of higher pressure or concentration to a point of lower pressure or concentration and to distribute itself throughout the available space. Diffusion, especially FACILITATED DIFFUSION, is a major mechanism of BIOLOGICAL TRANSPORT.

Membrane proteins whose primary function is to facilitate the transport of molecules across a biological membrane. Included in this broad category are proteins involved in active transport (BIOLOGICAL TRANSPORT, ACTIVE), facilitated transport and ION CHANNELS.

Test for tissue antigen using either a direct method, by conjugation of antibody with fluorescent dye (FLUORESCENT ANTIBODY TECHNIQUE, DIRECT) or an indirect method, by formation of antigen-antibody complex which is then labeled with fluorescein-conjugated anti-immunoglobulin antibody (FLUORESCENT ANTIBODY TECHNIQUE, INDIRECT). The tissue is then examined by fluorescence microscopy.

A complex of antigenic proteins obtained from the brush border of kidney tubules. It contains two principal components LOW DENSITY LIPOPROTEIN RECEPTOR-RELATED PROTEIN-2 and LDL-RECEPTOR RELATED PROTEIN-ASSOCIATED PROTEIN. The name of this complex is derived from researcher, Dr. Walter Heymann, who developed an experimental model of membranous glomerulonephritis (GLOMERULONEPHRITIS) by injecting this antigenic complex into rats to induce an autoimmune response.

An organization of cells into an organ-like structure. Organoids can be generated in culture. They are also found in certain neoplasms.

The part of a cell that contains the CYTOSOL and small structures excluding the CELL NUCLEUS; MITOCHONDRIA; and large VACUOLES. (Glick, Glossary of Biochemistry and Molecular Biology, 1990)

Receptors on the plasma membrane of nonhepatic cells that specifically bind LDL. The receptors are localized in specialized regions called coated pits. Hypercholesteremia is caused by an allelic genetic defect of three types: 1, receptors do not bind to LDL; 2, there is reduced binding of LDL; and 3, there is normal binding but no internalization of LDL. In consequence, entry of cholesterol esters into the cell is impaired and the intracellular feedback by cholesterol on 3-hydroxy-3-methylglutaryl CoA reductase is lacking.

The property of objects that determines the direction of heat flow when they are placed in direct thermal contact. The temperature is the energy of microscopic motions (vibrational and translational) of the particles of atoms.

Recombinant proteins produced by the GENETIC TRANSLATION of fused genes formed by the combination of NUCLEIC ACID REGULATORY SEQUENCES of one or more genes with the protein coding sequences of one or more genes.

A class of morphologically heterogeneous cytoplasmic particles in animal and plant tissues characterized by their content of hydrolytic enzymes and the structure-linked latency of these enzymes. The intracellular functions of lysosomes depend on their lytic potential. The single unit membrane of the lysosome acts as a barrier between the enzymes enclosed in the lysosome and the external substrate. The activity of the enzymes contained in lysosomes is limited or nil unless the vesicle in which they are enclosed is ruptured. Such rupture is supposed to be under metabolic (hormonal) control. (From Rieger et al., Glossary of Genetics: Classical and Molecular, 5th ed)

Any detectable and heritable change in the genetic material that causes a change in the GENOTYPE and which is transmitted to daughter cells and to succeeding generations.

The level of protein structure in which combinations of secondary protein structures (alpha helices, beta sheets, loop regions, and motifs) pack together to form folded shapes called domains. Disulfide bridges between cysteines in two different parts of the polypeptide chain along with other interactions between the chains play a role in the formation and stabilization of tertiary structure. Small proteins usually consist of only one domain but larger proteins may contain a number of domains connected by segments of polypeptide chain which lack regular secondary structure.

An element in the alkali group of metals with an atomic symbol K, atomic number 19, and atomic weight 39.10. It is the chief cation in the intracellular fluid of muscle and other cells. Potassium ion is a strong electrolyte that plays a significant role in the regulation of fluid volume and maintenance of the WATER-ELECTROLYTE BALANCE.

Proteins which are found in membranes including cellular and intracellular membranes. They consist of two types, peripheral and integral proteins. They include most membrane-associated enzymes, antigenic proteins, transport proteins, and drug, hormone, and lectin receptors.

A stack of flattened vesicles that functions in posttranslational processing and sorting of proteins, receiving them from the rough ENDOPLASMIC RETICULUM and directing them to secretory vesicles, LYSOSOMES, or the CELL MEMBRANE. The movement of proteins takes place by transfer vesicles that bud off from the rough endoplasmic reticulum or Golgi apparatus and fuse with the Golgi, lysosomes or cell membrane. (From Glick, Glossary of Biochemistry and Molecular Biology, 1990)

A protein phytotoxin from the seeds of Ricinus communis, the castor oil plant. It agglutinates cells, is proteolytic, and causes lethal inflammation and hemorrhage if taken internally.

An enzyme isolated from horseradish which is able to act as an antigen. It is frequently used as a histochemical tracer for light and electron microscopy. Its antigenicity has permitted its use as a combined antigen and marker in experimental immunology.

A C-type lectin that is a cell surface receptor for ASIALOGLYCOPROTEINS. It is found primarily in the LIVER where it mediates the endocytosis of serum glycoproteins.

The uptake of naked or purified DNA by CELLS, usually meaning the process as it occurs in eukaryotic cells. It is analogous to bacterial transformation (TRANSFORMATION, BACTERIAL) and both are routinely employed in GENE TRANSFER TECHNIQUES.

Artificial, single or multilaminar vesicles (made from lecithins or other lipids) that are used for the delivery of a variety of biological molecules or molecular complexes to cells, for example, drug delivery and gene transfer. They are also used to study membranes and membrane proteins.

A basic element found in nearly all organized tissues. It is a member of the alkaline earth family of metals with the atomic symbol Ca, atomic number 20, and atomic weight 40. Calcium is the most abundant mineral in the body and combines with phosphorus to form calcium phosphate in the bones and teeth. It is essential for the normal functioning of nerves and muscles and plays a role in blood coagulation (as factor IV) and in many enzymatic processes.

A subfamily in the family MURIDAE, comprising the hamsters. Four of the more common genera are Cricetus, CRICETULUS; MESOCRICETUS; and PHODOPUS.

Red blood cells. Mature erythrocytes are non-nucleated, biconcave disks containing HEMOGLOBIN whose function is to transport OXYGEN.

A family of large adaptin protein complex subunits of approximately 90-130 kDa in size.

The two lipoprotein layers in the MITOCHONDRION. The outer membrane encloses the entire mitochondrion and contains channels with TRANSPORT PROTEINS to move molecules and ions in and out of the organelle. The inner membrane folds into cristae and contains many ENZYMES important to cell METABOLISM and energy production (MITOCHONDRIAL ATP SYNTHASE).

Protein of the annexin family with a probable role in exocytotic and endocytotic membrane events.

Vesicles formed when cell-membrane coated pits (COATED PITS, CELL-MEMBRANE) invaginate and pinch off. The outer surface of these vesicles are covered with a lattice-like network of coat proteins, such as CLATHRIN, coat protein complex proteins, or CAVEOLINS.

The parts of a macromolecule that directly participate in its specific combination with another molecule.

The first continuously cultured human malignant CELL LINE, derived from the cervical carcinoma of Henrietta Lacks. These cells are used for VIRUS CULTIVATION and antitumor drug screening assays.

The sum of the weight of all the atoms in a molecule.

Cell membranes associated with synapses. Both presynaptic and postsynaptic membranes are included along with their integral or tightly associated specializations for the release or reception of transmitters.

The normality of a solution with respect to HYDROGEN ions; H+. It is related to acidity measurements in most cases by pH = log 1/2[1/(H+)], where (H+) is the hydrogen ion concentration in gram equivalents per liter of solution. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)

Intracellular fluid from the cytoplasm after removal of ORGANELLES and other insoluble cytoplasmic components.

A family of proteins that play a role as cofactors in the process of CLATHRIN recycling in cells.

Transport proteins that carry specific substances in the blood or across cell membranes.

Enzymes that hydrolyze GTP to GDP. EC 3.6.1.-.

Connective tissue cells which secrete an extracellular matrix rich in collagen and other macromolecules.

Techniques to partition various components of the cell into SUBCELLULAR FRACTIONS.

The movement of materials (including biochemical substances and drugs) through a biological system at the cellular level. The transport can be across cell membranes and epithelial layers. It also can occur within intracellular compartments and extracellular compartments.

CELL LINE derived from the ovary of the Chinese hamster, Cricetulus griseus (CRICETULUS). The species is a favorite for cytogenetic studies because of its small chromosome number. The cell line has provided model systems for the study of genetic alterations in cultured mammalian cells.

Domesticated bovine animals of the genus Bos, usually kept on a farm or ranch and used for the production of meat or dairy products or for heavy labor.

Agents used to occlude dental enamel pits and fissures in the prevention of dental caries.

Proteins prepared by recombinant DNA technology.

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.

One or more layers of EPITHELIAL CELLS, supported by the basal lamina, which covers the inner or outer surfaces of the body.

Structures which are part of the CELL MEMBRANE or have cell membrane as a major part of their structure.

Solutions that have a greater osmotic pressure than a reference solution such as blood, plasma, or interstitial fluid.

Electrophoresis in which a polyacrylamide gel is used as the diffusion medium.

Purifying or cleansing agents, usually salts of long-chain aliphatic bases or acids, that exert cleansing (oil-dissolving) and antimicrobial effects through a surface action that depends on possessing both hydrophilic and hydrophobic properties.

Derivatives of phosphatidic acids in which the phosphoric acid is bound in ester linkage to a choline moiety. Complete hydrolysis yields 1 mole of glycerol, phosphoric acid and choline and 2 moles of fatty acids.

The network of filaments, tubules, and interconnecting filamentous bridges which give shape, structure, and organization to the cytoplasm.

A species of gram-negative, facultatively anaerobic, rod-shaped bacteria (GRAM-NEGATIVE FACULTATIVELY ANAEROBIC RODS) commonly found in the lower part of the intestine of warm-blooded animals. It is usually nonpathogenic, but some strains are known to produce DIARRHEA and pyogenic infections. Pathogenic strains (virotypes) are classified by their specific pathogenic mechanisms such as toxins (ENTEROTOXIGENIC ESCHERICHIA COLI), etc.

A light microscopic technique in which only a small spot is illuminated and observed at a time. An image is constructed through point-by-point scanning of the field in this manner. Light sources may be conventional or laser, and fluorescence or transmitted observations are possible.

A subclass of clathrin assembly proteins that occur as monomers.

Proteins found in any species of bacterium.

Antibodies produced by a single clone of cells.

The sequence of PURINES and PYRIMIDINES in nucleic acids and polynucleotides. It is also called nucleotide sequence.

The movement of materials across cell membranes and epithelial layers against an electrochemical gradient, requiring the expenditure of metabolic energy.

Histochemical localization of immunoreactive substances using labeled antibodies as reagents.

A subtype of dynamin found primarily in the NEURONS of the brain.

Filamentous proteins that are the main constituent of the thin filaments of muscle fibers. The filaments (known also as filamentous or F-actin) can be dissociated into their globular subunits; each subunit is composed of a single polypeptide 375 amino acids long. This is known as globular or G-actin. In conjunction with MYOSINS, actin is responsible for the contraction and relaxation of muscle.

A species of CERCOPITHECUS containing three subspecies: C. tantalus, C. pygerythrus, and C. sabeus. They are found in the forests and savannah of Africa. The African green monkey (C. pygerythrus) is the natural host of SIMIAN IMMUNODEFICIENCY VIRUS and is used in AIDS research.

A class of lipoproteins of small size (18-25 nm) and light (1.019-1.063 g/ml) particles with a core composed mainly of CHOLESTEROL ESTERS and smaller amounts of TRIGLYCERIDES. The surface monolayer consists mostly of PHOSPHOLIPIDS, a single copy of APOLIPOPROTEIN B-100, and free cholesterol molecules. The main LDL function is to transport cholesterol and cholesterol esters to extrahepatic tissues.

Elements of limited time intervals, contributing to particular results or situations.

A member of the alkali group of metals. It has the atomic symbol Na, atomic number 11, and atomic weight 23.

The species Oryctolagus cuniculus, in the family Leporidae, order LAGOMORPHA. Rabbits are born in burrows, furless, and with eyes and ears closed. In contrast with HARES, rabbits have 22 chromosome pairs.

The prototypical phenothiazine antipsychotic drug. Like the other drugs in this class chlorpromazine's antipsychotic actions are thought to be due to long-term adaptation by the brain to blocking DOPAMINE RECEPTORS. Chlorpromazine has several other actions and therapeutic uses, including as an antiemetic and in the treatment of intractable hiccup.

Iron-containing proteins that are widely distributed in animals, plants, and microorganisms. Their major function is to store IRON in a nontoxic bioavailable form. Each ferritin molecule consists of ferric iron in a hollow protein shell (APOFERRITINS) made of 24 subunits of various sequences depending on the species and tissue types.

A system of cisternae in the CYTOPLASM of many cells. In places the endoplasmic reticulum is continuous with the plasma membrane (CELL MEMBRANE) or outer membrane of the nuclear envelope. If the outer surfaces of the endoplasmic reticulum membranes are coated with ribosomes, the endoplasmic reticulum is said to be rough-surfaced (ENDOPLASMIC RETICULUM, ROUGH); otherwise it is said to be smooth-surfaced (ENDOPLASMIC RETICULUM, SMOOTH). (King & Stansfield, A Dictionary of Genetics, 4th ed)

The insertion of recombinant DNA molecules from prokaryotic and/or eukaryotic sources into a replicating vehicle, such as a plasmid or virus vector, and the introduction of the resultant hybrid molecules into recipient cells without altering the viability of those cells.

Agents that emit light after excitation by light. The wave length of the emitted light is usually longer than that of the incident light. Fluorochromes are substances that cause fluorescence in other substances, i.e., dyes used to mark or label other compounds with fluorescent tags.

Components of a cell produced by various separation techniques which, though they disrupt the delicate anatomy of a cell, preserve the structure and physiology of its functioning constituents for biochemical and ultrastructural analysis. (From Alberts et al., Molecular Biology of the Cell, 2d ed, p163)

A yellow metallic element with the atomic symbol Au, atomic number 79, and atomic weight 197. It is used in jewelry, goldplating of other metals, as currency, and in dental restoration. Many of its clinical applications, such as ANTIRHEUMATIC AGENTS, are in the form of its salts.

The thin layers of tissue that surround the developing embryo. There are four extra-embryonic membranes commonly found in VERTEBRATES, such as REPTILES; BIRDS; and MAMMALS. They are the YOLK SAC, the ALLANTOIS, the AMNION, and the CHORION. These membranes provide protection and means to transport nutrients and wastes.

Models used experimentally or theoretically to study molecular shape, electronic properties, or interactions; includes analogous molecules, computer-generated graphics, and mechanical structures.

A clathrin adaptor protein complex primarily involved in clathrin-related transport at the TRANS-GOLGI NETWORK.

Gated, ion-selective glycoproteins that traverse membranes. The stimulus for ION CHANNEL GATING can be due to a variety of stimuli such as LIGANDS, a TRANSMEMBRANE POTENTIAL DIFFERENCE, mechanical deformation or through INTRACELLULAR SIGNALING PEPTIDES AND PROTEINS.

Endogenous glycoproteins from which SIALIC ACID has been removed by the action of sialidases. They bind tightly to the ASIALOGLYCOPROTEIN RECEPTOR which is located on hepatocyte plasma membranes. After internalization by adsorptive ENDOCYTOSIS they are delivered to LYSOSOMES for degradation. Therefore receptor-mediated clearance of asialoglycoproteins is an important aspect of the turnover of plasma glycoproteins. They are elevated in serum of patients with HEPATIC CIRRHOSIS or HEPATITIS.

The relationship between the chemical structure of a compound and its biological or pharmacological activity. Compounds are often classed together because they have structural characteristics in common including shape, size, stereochemical arrangement, and distribution of functional groups.

Cells grown in vitro from neoplastic tissue. If they can be established as a TUMOR CELL LINE, they can be propagated in cell culture indefinitely.

The principal sterol of all higher animals, distributed in body tissues, especially the brain and spinal cord, and in animal fats and oils.

Microscopy in which the object is examined directly by an electron beam scanning the specimen point-by-point. The image is constructed by detecting the products of specimen interactions that are projected above the plane of the sample, such as backscattered electrons. Although SCANNING TRANSMISSION ELECTRON MICROSCOPY also scans the specimen point by point with the electron beam, the image is constructed by detecting the electrons, or their interaction products that are transmitted through the sample plane, so that is a form of TRANSMISSION ELECTRON MICROSCOPY.

The ability of a substrate to allow the passage of ELECTRONS.

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. This also includes animals with a long history of closed colony breeding.

Genetically engineered MUTAGENESIS at a specific site in the DNA molecule that introduces a base substitution, or an insertion or deletion.

The characteristic 3-dimensional shape of a protein, including the secondary, supersecondary (motifs), tertiary (domains) and quaternary structure of the peptide chain. PROTEIN STRUCTURE, QUATERNARY describes the conformation assumed by multimeric proteins (aggregates of more than one polypeptide chain).

Membrane glycoproteins from influenza viruses which are involved in hemagglutination, virus attachment, and envelope fusion. Fourteen distinct subtypes of HA glycoproteins and nine of NA glycoproteins have been identified from INFLUENZA A VIRUS; no subtypes have been identified for Influenza B or Influenza C viruses.

Body organ that filters blood for the secretion of URINE and that regulates ion concentrations.

The ability of a substance to be dissolved, i.e. to form a solution with another substance. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)

Antigens on surfaces of cells, including infectious or foreign cells or viruses. They are usually protein-containing groups on cell membranes or walls and may be isolated.

The deductive study of shape, quantity, and dependence. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)

Members of the class of compounds composed of AMINO ACIDS joined together by peptide bonds between adjacent amino acids into linear, branched or cyclical structures. OLIGOPEPTIDES are composed of approximately 2-12 amino acids. Polypeptides are composed of approximately 13 or more amino acids. PROTEINS are linear polypeptides that are normally synthesized on RIBOSOMES.

A 6-kDa polypeptide growth factor initially discovered in mouse submaxillary glands. Human epidermal growth factor was originally isolated from urine based on its ability to inhibit gastric secretion and called urogastrone. Epidermal growth factor exerts a wide variety of biological effects including the promotion of proliferation and differentiation of mesenchymal and EPITHELIAL CELLS. It is synthesized as a transmembrane protein which can be cleaved to release a soluble active form.

Identification of proteins or peptides that have been electrophoretically separated by blot transferring from the electrophoresis gel to strips of nitrocellulose paper, followed by labeling with antibody probes.

Cell surface molecules on cells of the immune system that specifically bind surface molecules or messenger molecules and trigger changes in the behavior of cells. Although these receptors were first identified in the immune system, many have important functions elsewhere.

Specific hemagglutinin subtypes encoded by VIRUSES.

A family of DNA binding proteins that regulate expression of a variety of GENES during CELL DIFFERENTIATION and APOPTOSIS. Family members contain a highly conserved carboxy-terminal basic HELIX-TURN-HELIX MOTIF involved in dimerization and sequence-specific DNA binding.

A large lobed glandular organ in the abdomen of vertebrates that is responsible for detoxification, metabolism, synthesis and storage of various substances.

A non-essential amino acid. In animals it is synthesized from PHENYLALANINE. It is also the precursor of EPINEPHRINE; THYROID HORMONES; and melanin.

An acidifying agent that has expectorant and diuretic effects. Also used in etching and batteries and as a flux in electroplating.

Semiautonomous, self-reproducing organelles that occur in the cytoplasm of all cells of most, but not all, eukaryotes. Each mitochondrion is surrounded by a double limiting membrane. The inner membrane is highly invaginated, and its projections are called cristae. Mitochondria are the sites of the reactions of oxidative phosphorylation, which result in the formation of ATP. They contain distinctive RIBOSOMES, transfer RNAs (RNA, TRANSFER); AMINO ACYL T RNA SYNTHETASES; and elongation and termination factors. Mitochondria depend upon genes within the nucleus of the cells in which they reside for many essential messenger RNAs (RNA, MESSENGER). Mitochondria are believed to have arisen from aerobic bacteria that established a symbiotic relationship with primitive protoeukaryotes. (King & Stansfield, A Dictionary of Genetics, 4th ed)

Nonionic surfactant mixtures varying in the number of repeating ethoxy (oxy-1,2-ethanediyl) groups. They are used as detergents, emulsifiers, wetting agents, defoaming agents, etc. Octoxynol-9, the compound with 9 repeating ethoxy groups, is a spermatocide.

A cultured line of C3H mouse FIBROBLASTS that do not adhere to one another and do not express CADHERINS.

The degree of similarity between sequences of amino acids. This information is useful for the analyzing genetic relatedness of proteins and species.

Inorganic compounds derived from hydrochloric acid that contain the Cl- ion.

Property of membranes and other structures to permit passage of light, heat, gases, liquids, metabolites, and mineral ions.

Derivatives of phosphatidic acids in which the phosphoric acid is bound in ester linkage to a serine moiety. Complete hydrolysis yields 1 mole of glycerol, phosphoric acid and serine and 2 moles of fatty acids.

Cellular release of material within membrane-limited vesicles by fusion of the vesicles with the CELL MEMBRANE.

Cell lines whose original growing procedure consisted being transferred (T) every 3 days and plated at 300,000 cells per plate (J Cell Biol 17:299-313, 1963). Lines have been developed using several different strains of mice. Tissues are usually fibroblasts derived from mouse embryos but other types and sources have been developed as well. The 3T3 lines are valuable in vitro host systems for oncogenic virus transformation studies, since 3T3 cells possess a high sensitivity to CONTACT INHIBITION.

Derivatives of phosphatidic acids in which the phosphoric acid is bound in ester linkage to an ethanolamine moiety. Complete hydrolysis yields 1 mole of glycerol, phosphoric acid and ethanolamine and 2 moles of fatty acids.

The complex formed by the binding of antigen and antibody molecules. The deposition of large antigen-antibody complexes leading to tissue damage causes IMMUNE COMPLEX DISEASES.

The level of protein structure in which regular hydrogen-bond interactions within contiguous stretches of polypeptide chain give rise to alpha helices, beta strands (which align to form beta sheets) or other types of coils. This is the first folding level of protein conformation.

Protein analogs and derivatives of the Aequorea victoria green fluorescent protein that emit light (FLUORESCENCE) when excited with ULTRAVIOLET RAYS. They are used in REPORTER GENES in doing GENETIC TECHNIQUES. Numerous mutants have been made to emit other colors or be sensitive to pH.

A family of highly conserved and widely expressed sodium-phosphate cotransporter proteins. They are electrogenic sodium-dependent transporters of phosphate that were originally identified as retroviral receptors in HUMANS and have been described in yeast and many other organisms.

A molecule that binds to another molecule, used especially to refer to a small molecule that binds specifically to a larger molecule, e.g., an antigen binding to an antibody, a hormone or neurotransmitter binding to a receptor, or a substrate or allosteric effector binding to an enzyme. Ligands are also molecules that donate or accept a pair of electrons to form a coordinate covalent bond with the central metal atom of a coordination complex. (From Dorland, 27th ed)

CELL LINES derived from the CV-1 cell line by transformation with a replication origin defective mutant of SV40 VIRUS, which codes for wild type large T antigen (ANTIGENS, POLYOMAVIRUS TRANSFORMING). They are used for transfection and cloning. (The CV-1 cell line was derived from the kidney of an adult male African green monkey (CERCOPITHECUS AETHIOPS).)

Unstable isotopes of iodine that decay or disintegrate emitting radiation. I atoms with atomic weights 117-139, except I 127, are radioactive iodine isotopes.

The destruction of ERYTHROCYTES by many different causal agents such as antibodies, bacteria, chemicals, temperature, and changes in tonicity.

A high molecular weight (220-250 kDa) water-soluble protein which can be extracted from erythrocyte ghosts in low ionic strength buffers. The protein contains no lipids or carbohydrates, is the predominant species of peripheral erythrocyte membrane proteins, and exists as a fibrous coating on the inner, cytoplasmic surface of the membrane.

The voltage difference, normally maintained at approximately -180mV, across the INNER MITOCHONDRIAL MEMBRANE, by a net movement of positive charge across the membrane. It is a major component of the PROTON MOTIVE FORCE in MITOCHONDRIA used to drive the synthesis of ATP.

A major integral transmembrane protein of the ERYTHROCYTE MEMBRANE. It is the anion exchanger responsible for electroneutral transporting in CHLORIDE IONS in exchange of BICARBONATE IONS allowing CO2 uptake and transport from tissues to lungs by the red blood cells. Genetic mutations that result in a loss of the protein function have been associated with type 4 HEREDITARY SPHEROCYTOSIS.

A clear, odorless, tasteless liquid that is essential for most animal and plant life and is an excellent solvent for many substances. The chemical formula is hydrogen oxide (H2O). (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)

Proteins to which calcium ions are bound. They can act as transport proteins, regulator proteins, or activator proteins. They typically contain EF HAND MOTIFS.

The domestic dog, Canis familiaris, comprising about 400 breeds, of the carnivore family CANIDAE. They are worldwide in distribution and live in association with people. (Walker's Mammals of the World, 5th ed, p1065)

A layer of epithelium that lines the heart, blood vessels (ENDOTHELIUM, VASCULAR), lymph vessels (ENDOTHELIUM, LYMPHATIC), and the serous cavities of the body.

A broad category of carrier proteins that play a role in SIGNAL TRANSDUCTION. They generally contain several modular domains, each of which having its own binding activity, and act by forming complexes with other intracellular-signaling molecules. Signal-transducing adaptor proteins lack enzyme activity, however their activity can be modulated by other signal-transducing enzymes

Immunologic method used for detecting or quantifying immunoreactive substances. The substance is identified by first immobilizing it by blotting onto a membrane and then tagging it with labeled antibodies.

Any spaces or cavities within a cell. They may function in digestion, storage, secretion, or excretion.

The study of the generation and behavior of electrical charges in living organisms particularly the nervous system and the effects of electricity on living organisms.

Functionally and structurally differentiated, purple-pigmented regions of the cytoplasmic membrane of some strains of Halobacterium halobium. The membrane develops under anaerobic conditions and is made almost entirely of the purple pigment BACTERIORHODOPSINS. (From Singleton & Sainsbury Dictionary of Microbiology and Molecular Biology, 2d ed)

Cyclic GLUCANS consisting of seven (7) glucopyranose units linked by 1,4-glycosidic bonds.

Cells that line the inner and outer surfaces of the body by forming cellular layers (EPITHELIUM) or masses. Epithelial cells lining the SKIN; the MOUTH; the NOSE; and the ANAL CANAL derive from ectoderm; those lining the RESPIRATORY SYSTEM and the DIGESTIVE SYSTEM derive from endoderm; others (CARDIOVASCULAR SYSTEM and LYMPHATIC SYSTEM) derive from mesoderm. Epithelial cells can be classified mainly by cell shape and function into squamous, glandular and transitional epithelial cells.

Single membrane vesicles, generally made of PHOSPHOLIPIDS.

Measurement of the intensity and quality of fluorescence.

Conjugated protein-carbohydrate compounds including mucins, mucoid, and amyloid glycoproteins.

Electron microscopy in which the ELECTRONS or their reaction products that pass down through the specimen are imaged below the plane of the specimen.

Proteins obtained from ESCHERICHIA COLI.

The relationship between the dose of an administered drug and the response of the organism to the drug.

Regulatory proteins that act as molecular switches. They control a wide range of biological processes including: receptor signaling, intracellular signal transduction pathways, and protein synthesis. Their activity is regulated by factors that control their ability to bind to and hydrolyze GTP to GDP. EC 3.6.1.-.

A generic term for fats and lipoids, the alcohol-ether-soluble constituents of protoplasm, which are insoluble in water. They comprise the fats, fatty oils, essential oils, waxes, phospholipids, glycolipids, sulfolipids, aminolipids, chromolipids (lipochromes), and fatty acids. (Grant & Hackh's Chemical Dictionary, 5th ed)

A cell surface receptor involved in regulation of cell growth and differentiation. It is specific for EPIDERMAL GROWTH FACTOR and EGF-related peptides including TRANSFORMING GROWTH FACTOR ALPHA; AMPHIREGULIN; and HEPARIN-BINDING EGF-LIKE GROWTH FACTOR. The binding of ligand to the receptor causes activation of its intrinsic tyrosine kinase activity and rapid internalization of the receptor-ligand complex into the cell.

Conversion of an inactive form of an enzyme to one possessing metabolic activity. It includes 1, activation by ions (activators); 2, activation by cofactors (coenzymes); and 3, conversion of an enzyme precursor (proenzyme or zymogen) to an active enzyme.

A fold of the mucous membrane of the CONJUNCTIVA in many animals. At rest, it is hidden in the medial canthus. It can extend to cover part or all of the cornea to help clean the CORNEA.

The inner layer of CHOROID, also called the lamina basalis choroideae, located adjacent to the RETINAL PIGMENT EPITHELIUM; (RPE) of the EYE. It is a membrane composed of the basement membranes of the choriocapillaris ENDOTHELIUM and that of the RPE. The membrane stops at the OPTIC NERVE, as does the RPE.

The interaction of two or more substrates or ligands with the same binding site. The displacement of one by the other is used in quantitative and selective affinity measurements.

An enzyme that catalyzes the active transport system of sodium and potassium ions across the cell wall. Sodium and potassium ions are closely coupled with membrane ATPase which undergoes phosphorylation and dephosphorylation, thereby providing energy for transport of these ions against concentration gradients.

An electrophysiologic technique for studying cells, cell membranes, and occasionally isolated organelles. All patch-clamp methods rely on a very high-resistance seal between a micropipette and a membrane; the seal is usually attained by gentle suction. The four most common variants include on-cell patch, inside-out patch, outside-out patch, and whole-cell clamp. Patch-clamp methods are commonly used to voltage clamp, that is control the voltage across the membrane and measure current flow, but current-clamp methods, in which the current is controlled and the voltage is measured, are also used.

Orientation of intracellular structures especially with respect to the apical and basolateral domains of the plasma membrane. Polarized cells must direct proteins from the Golgi apparatus to the appropriate domain since tight junctions prevent proteins from diffusing between the two domains.

A common name used for the genus Cavia. The most common species is Cavia porcellus which is the domesticated guinea pig used for pets and biomedical research.

Partial proteins formed by partial hydrolysis of complete proteins or generated through PROTEIN ENGINEERING techniques.

A strain of albino rat used widely for experimental purposes because of its calmness and ease of handling. It was developed by the Sprague-Dawley Animal Company.

A class of sphingolipids found largely in the brain and other nervous tissue. They contain phosphocholine or phosphoethanolamine as their polar head group so therefore are the only sphingolipids classified as PHOSPHOLIPIDS.

Vesicles that are involved in shuttling cargo from the interior of the cell to the cell surface, from the cell surface to the interior, across the cell or around the cell to various locations.

A partitioning within cells due to the selectively permeable membranes which enclose each of the separate parts, e.g., mitochondria, lysosomes, etc.

A receptor that is specific for IGF-II and mannose-6-phosphate. The receptor is a 250-kDa single chain polypeptide which is unrelated in structure to the type 1 IGF receptor (RECEPTOR, IGF TYPE 1) and does not have a tyrosine kinase domain.

Compounds containing carbohydrate or glycosyl groups linked to phosphatidylinositols. They anchor GPI-LINKED PROTEINS or polysaccharides to cell membranes.

Tendency of fluids (e.g., water) to move from the less concentrated to the more concentrated side of a semipermeable membrane.

RNA sequences that serve as templates for protein synthesis. Bacterial mRNAs are generally primary transcripts in that they do not require post-transcriptional processing. Eukaryotic mRNA is synthesized in the nucleus and must be exported to the cytoplasm for translation. Most eukaryotic mRNAs have a sequence of polyadenylic acid at the 3' end, referred to as the poly(A) tail. The function of this tail is not known for certain, but it may play a role in the export of mature mRNA from the nucleus as well as in helping stabilize some mRNA molecules by retarding their degradation in the cytoplasm.

A product of COMPLEMENT ACTIVATION cascade, regardless of the pathways, that forms transmembrane channels causing disruption of the target CELL MEMBRANE and cell lysis. It is formed by the sequential assembly of terminal complement components (COMPLEMENT C5B; COMPLEMENT C6; COMPLEMENT C7; COMPLEMENT C8; and COMPLEMENT C9) into the target membrane. The resultant C5b-8-poly-C9 is the "membrane attack complex" or MAC.

Enhancement of endocytosis due to aminophospholipid transport across the plasma membrane of living cells. (1/613)

Formation of intracellular vesicles is initiated by membrane budding. Here we test the hypothesis that the plasma membrane surface area asymmetry could be a driving force for vesicle formation during endocytosis. The inner layer phospholipid number was therefore increased by adding exogenous aminophospholipids to living cells, which were then translocated from the outer to the inner layer of the membrane by the ubiquitous flippase. Addition of either phosphatidylserine or phosphatidylethanolamine led to an enhancement of endocytosis, showing that the observed acceleration does not depend on the lipid polar head group. Conversely, a closely related aminophospholipid that is not recognized by the flippase, lyso-alpha-phosphatidylserine, inhibited endocytosis, and similar results were obtained with a cholesterol derivative that also remains in the plasma membrane outer layer. Thus an increase of lipid concentration in the inner layer enhanced internalization, whereas an increase of the lipid concentration in the outer layer inhibited internalization. These experiments suggest that transient asymmetries in lipid concentration might contribute to the formation of endocytic vesicles. (+info)

Inhibition of clathrin-coated pit assembly by an Eps15 mutant. (2/613)

Recent data have shown that Eps15, a newly identified component of clathrin-coated pits constitutively associated with the AP-2 complex, is required for receptor-mediated endocytosis. However, its precise function remains unknown. Interestingly, Eps15 contains three EH (Eps15-Homology) domains also found in proteins required for the internalization step of endocytosis in yeast. Results presented here show that EH domains are required for correct coated pit targeting of Eps15. Furthermore, when cells expressed an Eps15 mutant lacking EH domains, the plasma membrane punctate distribution of both AP-2 and clathrin was lost, implying the absence of coated pits. This was further confirmed by the fact that dynamin, a GTPase found in coated pits, was homogeneously redistributed on the plasma membrane and that endocytosis of transferrin, a specific marker of clathrin-dependent endocytosis, was strongly inhibited. Altogether, these results strongly suggest a role for Eps15 in coated pit assembly and more precisely a role for Eps15 in the docking of AP-2 onto the plasma membrane. This hypothesis is supported by the fact that a GFP fusion protein encoding the ear domain of (alpha)-adaptin, the AP-2 binding site for Eps15, was efficiently targeted to plasma membrane coated pits. (+info)

Direct demonstration of the endocytic function of caveolae by a cell-free assay. (3/613)

The endocytic function of caveolae was challenged by taking advantage of a cell-free assay directly measuring the detachment of receptor-containing vesicles from isolated plasma membranes. Plasma membranes from cultured cells surface-labeled with 125I-cholera toxin (segregating in caveolae) were isolated as described previously. Following incubation of these labeled membranes in the presence of nucleotide(s) and cytosol, a significant proportion of the initially membrane-associated radioactivity was released into the incubation medium in sedimentable form (14*10(6 )g). Results of biochemical, morphological, and fractionation analysis of the material containing the released radioactivity directly demonstrated that caveolae are plasma membrane domains involved in an endocytic process and resulting in the formation of caveolae-derived vesicles. In addition, these studies allowed a direct comparison of caveolae- and clathrin-coated pit-mediated endocytosis and reveal that these two processes diverge in terms of kinetics, cytosol and nucleotide requirements as well as in terms of the density and size of the endocytic vesicles formed. (+info)

Characterization of the internalization pathways for the cystic fibrosis transmembrane conductance regulator. (4/613)

Mutations in the gene encoding the cystic fibrosis (CF) transmembrane conductance regulator (CFTR) chloride channel give rise to the most common lethal genetic disease of Caucasian populations, CF. Although the function of CFTR is primarily related to the regulation of apical membrane chloride permeability, biochemical, immunocytochemical, and functional studies indicate that CFTR is also present in endosomal and trans Golgi compartments. The molecular pathways by which CFTR is internalized into intracellular compartments are not fully understood. To define the pathways for CFTR internalization, we investigated the association of CFTR with two specialized domains of the plasma membrane, clathrin-coated pits and caveolae. Internalization of CFTR was monitored after cell surface biotinylation and quantitation of cell surface CFTR levels after elution of cell lysates from a monomeric avidin column. Cell surface levels of CFTR were determined after disruption of caveolae or clathrin-coated vesicle formation. Biochemical assays revealed that disrupting the formation of clathrin-coated vesicles inhibited the internalization of CFTR from the plasma membrane, resulting in a threefold increase in the steady-state levels of cell surface CFTR. In contrast, the levels of cell surface CFTR after disruption of caveolae were not different from those in control cells. In addition, although our studies show the presence of caveolin at the apical membrane domain of human airway epithelial cells, we were unable to detect CFTR in purified caveolae. These results suggest that CFTR is constitutively internalized from the apical plasma membrane via clathrin-coated pits and that CFTR is excluded from caveolae. (+info)

Cutting edge: receptor-mediated endocytosis of heat shock proteins by professional antigen-presenting cells. (5/613)

Immunization with heat shock proteins (HSPs) induces Ag-specific CTL responses. The specificity of the immune response is based on peptides associated with HSPs. To investigate how exogenous HSP/peptide complexes gain access to the MHC class I-restricted Ag presentation pathway, we incubated the monocytic cell line P388D1 and the dendritic cell line D2SC/1 with gold-labeled HSPs gp96 and HSC70. We show that HSPs bind specifically to the surface of these APCs and are internalized spontaneously by receptor-mediated endocytosis, demonstrating the existence of specific receptors for HSPs on these cells. In addition, we observe colocalization of internalized HSPs and surface MHC class I molecules in early and late endosomal structures. These findings provide possible explanations for the immunogenicity of HSP/peptide complexes and for the transfer of HSP-associated peptides onto MHC class I molecules. (+info)

Bradykinin-induced internalization of the human B2 receptor requires phosphorylation of three serine and two threonine residues at its carboxyl tail. (6/613)

The binding of bradykinin (BK) to B2 receptor triggers the internalization of the agonist-receptor complex. To investigate the mechanisms and the receptor structures involved in this fundamental process of receptor regulation, the human B2 receptor was mutated within its cytoplasmic tail by complementary strategies of truncation, deletion, and amino acid substitution. Ligand binding, signal transduction, internalization as well as phosphorylation were studied for the mutated receptors expressed in COS, CHO, and HEK 293 cells. Truncation of 44 out of 55 amino acid residues of the receptor's cytoplasmic tail corresponding to positions 321-364 did not alter the kinetics of BK binding and the receptor coupling to phospholipase C and phospholipase A2. By contrast, truncations after positions 320 and 334, deletions within the segment covering positions 335-351, as well as alanine substitution of serine and threonine residues within segment 335-351 diminished the internalization capacity of the mutant receptors. Mutants with a markedly reduced internalization potential failed to produce BK-induced receptor phosphorylation suggesting that phosphorylation may be involved in receptor internalization. The mutagenesis approaches converged at the conclusion that three serines in positions 339, 346, and 348 and two threonines in positions 342 and 345, contained in a sequence segment that is highly conserved between species, have a critical role in the ligand-dependent internalization and phosphorylation of kinin receptors and can intervene in these processes in an alternative manner. However, mutants lacking these residues were still sensitive to dominant-negative forms of beta-arrestin and dynamin, suggesting the existence of additional receptor structure(s) involved in the receptor sequestration through clathrin-coated vesicles. (+info)

Inhibition of the receptor-binding function of clathrin adaptor protein AP-2 by dominant-negative mutant mu2 subunit and its effects on endocytosis. (7/613)

Although interactions between the mu2 subunit of the clathrin adaptor protein complex AP-2 and tyrosine-based internalization motifs have been implicated in the selective recruitment of cargo molecules into coated pits, the functional significance of this interaction for endocytosis of many types of membrane proteins remains unclear. To analyze the function of mu2-receptor interactions, we constructed an epitope-tagged mu2 that incorporates into AP-2 and is targeted to coated pits. Mutational analysis revealed that Asp176 and Trp421 of mu2 are involved in the interaction with internalization motifs of TGN38 and epidermal growth factor (EGF) receptor. Inducible overexpression of mutant mu2, in which these two residues were changed to alanines, resulted in metabolic replacement of endogenous mu2 in AP-2 complexes and complete abrogation of AP-2 interaction with the tyrosine-based internalization motifs. As a consequence, endocytosis of the transferrin receptor was severely impaired. In contrast, internalization of the EGF receptor was not affected. These results demonstrate the potential usefulness of the dominant-interfering approach for functional analysis of the adaptor protein family, and indicate that clathrin-mediated endocytosis may proceed in both a mu2-dependent and -independent manner. (+info)

Functional properties of leptin receptor isoforms: internalization and degradation of leptin and ligand-induced receptor downregulation. (8/613)

Long (ObRb) and short (ObRa) leptin receptor isoforms are thought to play essential roles in mediating leptin signaling and the transport and degradation of leptin, respectively. Although the capacity of these cloned receptor species to mediate signal transduction has been reported, there is no information on the ability of individual receptor species to mediate leptin internalization and degradation or to undergo ligand-induced downregulation. We therefore studied these parameters in Chinese hamster ovary (CHO) cells stably expressing either ObRa or ObRb isoforms of the leptin receptor. We determined that both ObRa and ObRb mediated internalization of 125I-labeled leptin by a temperature- and coated pit-dependent mechanism. Both ObRa and ObRb also mediated degradation of 125I-leptin by a lysosomal mechanism, and this was more efficiently mediated by ObRa in these cells. Neither leptin internalization nor degradation by ObRa was affected by mutation of the conserved Box 1 motif. By studying deletion mutants of ObRa, we found that efficient internalization was dependent on a motif located between amino acids 8 and 29 of the intracellular domain of ObRa. Exposure of cells expressing ObRa or ObRb to unlabeled leptin for 90 min at 37 degrees C produced downregulation of available surface receptors, and this effect was of greater magnitude in cells expressing ObRb. Whereas CHO cells expressing the growth hormone receptor showed marked downregulation of ligand binding after exposure to dexamethasone (DEX) or phorbol myristic acid (PMA), PMA had no effect on expression of ObRa or ObRb, and DEX reduced binding to cells expressing ObRb by 15%. Thus, the two leptin receptor isoforms, ObRa and ObRb, mediate leptin internalization by a coated pit-dependent mechanism, leptin degradation by a lysosomal pathway, and ligand-induced receptor downregulation. The differential capacity of the two receptor isoforms may relate to the different roles of the receptor isoforms in the biology of leptin. (+info)

... s secrete and maintain the basement membrane. There are numerous coated vesicles and coated pits along the basolateral ... Podocytes are cells in the Bowman's capsule in the kidneys that wrap around capillaries of the glomerulus. Podocytes make up ... List of human cell types derived from the germ layers "Podocyte" at Dorland's Medical Dictionary Lote, Christopher J. ... Cell. Biol. 23 (10): 3575-82. doi:10.1128/mcb.23.10.3575-3582.2003. PMC 164754. PMID 12724416. Ciani L; Massella L; Ruggiero B ...

https://en.wikipedia.org/wiki/Podocyte

... many LDL receptors concentrate in clathrin-coated pits. Both LDL and its receptor form vesicles within a cell via endocytosis. ... which both alters membrane fluidity and maintains membrane integrity so that animal cells do not need to build cell walls (like ... of all animal cell membranes. It is required to build and maintain membranes and modulates membrane fluidity over the range of ... Cholesterol is biosynthesized by all animal cells and is an essential structural component of animal cell membranes. It is a ...

https://en.wikipedia.org/wiki/Cholesterol

He and Hopkins showed that the specific membrane endocytosed by coated pits on motile cells is returned by exocytosis to the ... This led him to propose that, as a cell moves, membrane from internal stores is added at the front of the cell-enabling the ... Bretscher, MS (1996). "Getting Membrane Flow and the Cytoskeleton to Cooperate in Moving Cells". Cell. 87 (4): 601-606. doi: ... 1996). "Actin-Based Cell Motility and Cell Locomotion". Cell. 84 (3): 371-379. doi:10.1016/S0092-8674(00)81281-7. PMID 8608590 ...

https://en.wikipedia.org/wiki/Cap_formation

Budding of the plasma membrane then occurs, forming a clathrin coated pit.[1] Other receptors can nucleate a clathrin-coated ... The cargo ligand and receptor will then recruit adaptor proteins and clathrin triskelions to the outside membrane of the cell ... A mature pit will be cleaved from the plasma membrane through the use of membrane binding and fission proteins such as dynamin ... "Cell. 166 (4): 907-919. doi:10.1016/j.cell.2016.07.004. PMC 5418658. PMID 27499021.. ...

https://en.wikipedia.org/wiki/Receptor-mediated_endocytosis

1), and contain twice as many clathrin-coated pits per membrane unit, compared with two other major liver cells, Kupffer cells ... The name scavenger endothelial cells (SECs) has been coined to denote the endothelial cells in vertebrates that are geared to ... these specialized endothelial cells are located either in the heart endocardium or in endothelial cells of the kidney ... endothelial and Kupffer cells". Cell and Tissue Research. 304 (2): 221-30. doi:10.1007/s004410100348. PMID 11396716. Sørensen, ...

https://en.wikipedia.org/wiki/Liver_sinusoidal_endothelial_cell

Cell. 1978 Nov; 15 (3) :919-33. [11] Coated pits, coated vesicles, and receptor-mediated endocytosis. Nature. 1979 Jun 21; 279 ... Cell. 1994 Apr 8; 77 (1) :53-62 [48] Sterol-regulated release of SREBP-2 from cell membranes requires two sequential cleavages ... Cell. 1977 Nov; 12 (3) :629-41. [9] A mutation that impairs the ability of lipoprotein receptors to localise in coated pits on ... Cell. 1983 Mar; 32 (3) :941-51. [19] Depletion of intracellular potassium arrests coated pit formation and receptor-mediated ...

https://uk.wikipedia.org/wiki/Майкл_Стюарт_Браун

Peripheral membrane protein/Lipid-anchored protein. Other. *Caveolae/Coated pits. *Cell junctions ... plasmatic membrane (Pfeffer, 1900),[13] plasma membrane, cytoplasmic membrane, cell envelope and cell membrane.[14][15] Some ... Intracellular membranes. The content of the cell, inside the cell membrane, is composed of numerous membrane-bound organelles, ... The basic function of the cell membrane is to protect the cell from its surroundings. The cell membrane controls the movement ...

https://en.wikipedia.org/wiki/Basolateral

Endocytosis is initiated via low pH levels and coated pits that are made up of clathrin. The virus is then able to fuse with ... Virus entry into the host cell occurs when viral G glycoproteins attach to host cell surface receptors, initiating endocytosis ... Once the virus fuses to the hosts membrane, replication occurs. The five proteins in SCV are transcribed from their (-)RNA by ... RNA viruses, such as SCV, are not able to be translated by the host because cells do not have the machinery to copy it, ...

https://en.wikipedia.org/wiki/Strawberry_crinkle_cytorhabdovirus

"The first five seconds in the life of a clathrin-coated pit". Cell. 150 (3): 495-507. doi:10.1016/j.cell.2012.05.047. PMC ... is thought to help curve the membrane as the clathrin coated pit forms. The muniscins are early arriving proteins involved in ... "Intersectin 1 forms complexes with SGIP1 and Reps1 in clathrin-coated pits". Biochemical and Biophysical Research ... Robinson MS (2015). "Forty Years of Clathrin-coated Vesicles". Traffic. 16 (12): 1210-38. doi:10.1111/tra.12335. PMID 26403691 ...

https://en.wikipedia.org/wiki/Muniscins

... allowing the clathrin pit to excise itself from the cell membrane and become a cytoplasmic vesicle.[63] Once the clathrin coat ... consisting of a clathrin-coated pit underneath a section of AMPAR-containing plasma membrane and interacting proteins, is the ... The Ca2+ that enters the cell triggers the upregulation of AMPARs to the membrane, which results in a long-lasting increase in ... "Cell. 135 (3): 535-48. doi:10.1016/j.cell.2008.09.057. PMC 2585749 . PMID 18984164.. ...

https://en.wikipedia.org/wiki/AMPAR

The cleaved glycoproteins are incorporated into the virion envelope when the virus buds and release from the cell membrane.[23] ... Unlike most enveloped viruses which use clathrin coated pits for cellular entry and bind to their receptors in a pH dependent ... The main targets of the virus are antigen-presenting cells, mainly dendritic cells) and endothelial cells.[25][26][27] In 2012 ... The Lassa virus gains entry into the host cell by means of the cell-surface receptor the alpha-dystroglycan (alpha-DG),[18] a ...

https://en.wikipedia.org/wiki/Lassa_virus

Caveolae/Coated pits. *پیوند میان‌یاخته‌ای. *گلیکوکالیکس. *Lipid raft/microdomains. *Membrane contact sites ... Membranes *proteins. *cell adhesions. *Membrane transport *ion channels. *vesicular transport. *solute carrier ...

https://fa.wikipedia.org/wiki/غشاء_دولایه_لیپیدی

Low-density lipoproteins are taken into the cell by LDL receptor-mediated endocytosis in clathrin-coated pits, and then ... Cholesterol is required to build and maintain cell membranes; it regulates membrane fluidity over a wide range of temperatures ... It plays a central role in many biochemical processes, such as the building of cell membranes and the synthesis of steroid ... By serving as ligands for specific receptors on cell membranes, the apolipoproteins that reside on the surface of a given ...

https://si.wikipedia.org/wiki/කොලෙස්ටරෝල්

clathrin-coated pit. • secretory granule lumen. • endosome membrane. • extracellular exosome. • extracellular space. • clathrin ... basal part of cell. • endocytic vesicle. • extracellular region. • cell surface. • basal plasma membrane. • extrinsic component ... membrane organization. • ferrous iron import across plasma membrane. • post-translational protein modification. • cellular ... coated vesicle membrane. • cytoplasmic vesicle. • endoplasmic reticulum lumen. Biological process. • positive regulation of ...

https://en.wikipedia.org/wiki/Transferrin

integral component of membrane. • endosome. • membrane. • integral component of plasma membrane. • cell membrane. ... A pinched-off coated pit is internalized and degraded by lysosomes. Proteins may be metabolized or the receptor can be recycled ... The LHCGR is present on granulosa cells, theca cells, luteal cells, and interstitial cells[6] The LCGR is restimulated by ... The bound LCGR complex is brought by lateral migration to a coated pit, where such units are concentrated and then stabilized ...

https://en.wikipedia.org/wiki/Luteinizing_hormone/choriogonadotropin_receptor

Most animal epithelial cells have a fuzz-like coating on the external surface of their plasma membranes. This coating consists ... and other cells. In 1970, Martinez and Palomo discovered the cell coat in animal cells, which is known as the glycocalyx. ... Peripheral membrane protein/Lipid-anchored protein. Other. *Caveolae/Coated pits. *Cell junctions ... diseased cells, or invading organisms. Included in the glycocalyx are cell-adhesion molecules that enable cells to adhere to ...

https://en.wikipedia.org/wiki/Glycocalyx

Peripheral membrane protein/Lipid-anchored protein. Other. *Caveolae/Coated pits. *Cell junctions ... This membrane stretches and spirally wraps itself over and over as the in-folding of the Schwann cell surface continues. As a ... An action potential is a spike of both positive and negative ionic discharge that travels along the membrane of a cell.[9] The ... This process is sequenced by the in-folding of the Schwann cell surface so that a double membrane of the opposing faces of the ...

https://en.wikipedia.org/wiki/Node_of_Ranvier

Peripheral membrane protein/Lipid-anchored protein. Other. *Caveolae/Coated pits. *Cell junctions ... A transmembrane protein (TP) is a type of integral membrane protein that spans the entirety of the cell membrane. Many ... Alpha-helical proteins are present in the inner membranes of bacterial cells or the plasma membrane of eukaryotes, and ... Membrane Proteins of known 3D Structure *^ Elofsson, A.; Heijne, G. V. (2007). "Membrane Protein Structure: Prediction versus ...

https://en.wikipedia.org/wiki/Transmembrane_protein

Peripheral membrane protein/Lipid-anchored protein. Other. *Caveolae/Coated pits. *Cell junctions ... Protein: cell membrane proteins (other than Cell surface receptor, enzymes, and cytoskeleton) ... by glial cells called Schwann cells. In the CNS, axons carry electrical signals from one nerve cell body to another. In the PNS ... In the CNS, cells called oligodendrocyte precursor cells (OPCs; the precursors of oligodendrocytes) differentiate into mature ...

https://en.wikipedia.org/wiki/Myelinated

Electron microscopy experiments show IFNAR receptors concentrated in clathrin-coated pits, and inhibition of clathrin-mediated ... doi:10.1016/j.cell.2015.12.027. PMC 4733246. PMID 26824652.. *^ a b c d e Owens T, Khorooshi R, Wlodarczyk A, Asgari N (March ... thereby reducing membrane expression,[15] or it can result in recycling of the receptor without an extended impact on membrane ... Additionally, IFNs largely impact cell health and viability, with effects on apoptosis, autophagy, cell differentiation, and ...

https://en.wikipedia.org/wiki/Interferon-alpha/beta_receptor

Although some mucins are membrane-bound due to the presence of a hydrophobic membrane-spanning domain that favors retention in ... The dense "sugar coating" of mucins gives them considerable water-holding capacity and also makes them resistant to proteolysis ... Abnormal deposits of mucin are responsible for the non-pitting facial edema seen in untreated hypothyroidism. This edema is ... Perez-Vilar J (February 2007). "Mucin granule intraluminal organization". American Journal of Respiratory Cell and Molecular ...

https://en.wikipedia.org/wiki/Mucin

... -coated vesicles (CCV) selectively sort cargo at the cell membrane, trans-Golgi network, and endosomal compartments for ... Role of the Clathrin Terminal Domain in Regulating Coated Pit Dynamics Revealed by Small Molecule Inhibition,Cell, Volume 146, ... In non-dividing cells, the formation of clathrin-coated vesicles occurs continuously. Formation of clathrin-coated vesicles is ... and can help deform the membrane, and thus clathrin-coated vesicles can bud. In a cell, a triskelion floating in the cytoplasm ...

https://en.wikipedia.org/wiki/Clathrin

Once the pit has been pinched off the plasma membrane due to the actions of two other proteins called amphiphysin and dynamin, ... Translocation: The receptor is, along with the part of the membrane it is embedded in, brought to the inside of the cell, where ... of beta-arrestin with the AP-2 adaptor is required for the clustering of beta 2-adrenergic receptor into clathrin-coated pits ... Used in the endocrine system for peptide and amino-acid derivative hormones that bind to GCPRs on the cell membrane of a target ...

https://en.m.wikipedia.org/wiki/G_protein-coupled_receptors

It is then endocytosed into a vesicle inside the host cell and creates a fusion of the virus and vesicle membranes. The ... The rodent of choice should be lively and alert, have a glossy coat, breathe normally and have no discharge from eyes or nose. ... Post mortem lesions in mice show signs of hepatomegaly, splenomegaly, lymphadenopathy, and swollen or shrunken and pitted ... The ribonucleocapsid interacts with the Z matrix protein and buds on the cell membrane, releasing the virion out from the ...

https://en.wikipedia.org/wiki/Lymphocytic_choriomeningitis

... of β-arrestin with the AP-2 adaptor is required for the clustering of β2-adrenergic receptor into clathrin-coated pits". J. ... Cell. Biol. 9, 639-50. *Lefkowitz, R.J. & Whalen, E.J. (2004). Beta-arrestins: traffic cops of cell signaling. Curr. Opin. Cell ... Lizozomne membrane su bogate u protonskim pumpama te njihova unutrašnjost ima nizak pH (≈4.8 vs. pH≈7.2 citozola), što uzrokuje ... 33,0 33,1 Tan CM, Brady AE, Nickols HH, Wang Q, Limbird LE (2004). "Membrane trafficking of G protein-coupled receptors". Annu ...

https://sh.wikipedia.org/wiki/G_protein_spregnuti_receptor

Continuous Flow Blood Pumps F1842-15 Test Method for Determining Ink or Coating Adhesion on Flexible Substrates for a Membrane ... F2149-16 Test Method for Automated Analyses of Cells-the Electrical Sensing Zone Method of Enumerating and Sizing Single Cell ... Test Method for Pitting or Crevice Corrosion of Metallic Surgical Implant Materials F747-15 Terminology Relating to Amusement ... Metallic-Coated or Polymer Coated) for Meshes of 6 in.2 [3871 mm2 or Less, in Panels or Rolls, with Uniform Meshes F2454-05( ...

https://en.wikipedia.org/wiki/List_of_ASTM_International_standards_(F)

The SCC mechanism results from the following sequence of events: Pitting occurs. Cracks start from a pit initiation site. ... Rust refers to hydrated forms of ferric oxide, that is, to the "reddish brittle coating formed on iron especially when ... Conversely, stainless steel is used in fuel cells which perform the opposite reaction, combining hydrogen and oxygen to produce ... Stainless steel is used in electrolysers (proton exchange membranes and solid oxide electrolysers being the most common) that ...

https://en.wikipedia.org/wiki/Stainless_steel

... basement membrane, or BM) and the tissue surrounding the tumor by the cell Intravasation of the circulatory system: the cell ... iron-oxide nanoparticles were coated with about 20 molecules of chlorotoxin and targeted to brain-metastatic cancer cells. It ... as in the case of apricot-pit therapy-which exposes the patient to cyanide-or in chiropractic, which can be dangerous to ... a cell-surface adhesion molecule) is important for tumor attachment, cell-to-cell communication between the breast tumor cells ...

https://en.wikipedia.org/wiki/Metastatic_breast_cancer

Plasma membranes appear discontinuous when viewed with an electron microscope. This discontinuous membrane is caused by cell ... Chotenimitkhun R, Rojnuckarin P; Rojnuckarin (2008). "Systemic antivenom and skin necrosis after green pit viper bites". Clin ... the effects of secretions from Lucilia sericata larvae upon the migration of human dermal fibroblasts over a fibronectin-coated ... and result in the loss of cell membrane integrity and an uncontrolled release of products of cell death into the extracellular ...

https://en.wikipedia.org/wiki/Necrotic

Ford MG, Mills IG, Peter BJ, Vallis Y, Praefcke GJ, Evans PR, McMahon HT (September 2002). "Curvature of clathrin-coated pits ... a unique protein associated with intracellular transfer of membrane by coated vesicles". Proceedings of the National Academy of ... Nature Reviews Molecular Cell Biology 7 (1): 32-44. PMID 16493411. doi:10.1038/nrm1786. Cite uses deprecated parameter ,month= ... "Clathrin coats at 21 A resolution: a cellular assembly designed to recycle multiple membrane receptors". The EMBO Journal 17 ...

https://sh.wikipedia.org/wiki/Klatrin

Gloves, masks, laboratory coats, and goggles are advised while in contact with an infected person, to avoid contact with blood ... The "Swollen baby syndrome" occurs in newborns, infants and toddlers with pitting edema, abdominal distension and hemorrhage.[6 ... It is possible to acquire the infection through broken skin or mucous membranes that are directly exposed to infectious ... Other laboratory findings in Lassa fever include lymphocytopenia (low white blood cell count), thrombocytopenia (low platelets ...

https://en.wikipedia.org/wiki/Lassa_fever

... which is either secreted by surface cells or more usually by underlying glands. The mucous membrane in the mouth continues as ... This is how gallstones form when a small piece of calcium gets coated with either cholesterol or bilirubin and the bile ... These include the various cells of the gastric glands, taste cells, pancreatic duct cells, enterocytes and microfold cells. ... Underlying the mucous membrane in the mouth is a thin layer of smooth muscle tissue and the loose connection to the membrane ...

https://en.wikipedia.org/wiki/Digestive_system

Detergents are key reagents to extract protein by lysis of the cells and tissues: They disorganize the membrane's lipid bilayer ... The compounds that coat a micelle are typically amphiphilic in nature, meaning that micelles may be stable either as droplets ... The polar "heads" of the surfactant molecules coating the micelle interact more strongly with water, so they form a hydrophilic ... surfactants can irritate and damage the skin because surfactants disrupt the lipid membrane that protects skin and other cells ...

https://en.wikipedia.org/wiki/Surfactant

... penetrate the host xylem through pits in the membrane.[16] The oscula then swell to secure their position within the xylem ... Shortly after the host xylem is penetrated, Striga sieve tubes develop and approach the host phloem within eight cells.[17][18] ... An example is TAN222, the "striga-resistant" maize variety which is coated with the systemic herbicide imazapyr, to which it is ... Within 12 hours of initial haustorium growth, the haustorium recognizes the host root and begins rapid cell division and ...

https://en.wikipedia.org/wiki/Striga_

membrane. • clathrin-coated pit. • filamentous actin. • plasma membrane. • nuclear membrane. • cytoplasm. • cell cortex. • ... clathrin-coated endocytic vesicle. • protein complex. • apical part of cell. • clathrin-coated vesicle membrane. • ruffle. • ... cell nucleus. • intracellular membrane-bounded organelle. • cell projection. • ruffle membrane. • DNA-directed RNA polymerase ... "The Journal of Cell Biology. 143 (6): 1535-45. doi:10.1083/jcb.143.6.1535. PMC 2132970. PMID 9852149.. ...

https://en.wikipedia.org/wiki/MYO6

A cell membrane can be thought of as a capacitor in that positive and negative ions are stored on both sides of the membrane. ... 2010). "Intersectin 1 forms complexes with SGIP1 and Reps1 in clathrin-coated pits". Biochemical and Biophysical Research ... the membrane this induces a mechanical force on the membrane so that it causes the vesicle membrane and presynaptic membrane to ... 5) In the periactive zone the membrane proteins are sequestered and are endocytosed forming a clathrin coated vesicle. (6) The ...

https://en.wikipedia.org/wiki/Active_zone

Irritation of mucous membranes[edit]. Hydrogen peroxide is an irritant and cytotoxic. Hydrogen peroxide with concentrations of ... Hemolytic disease of the newborn:[9] This disease occurs when a newborn's red blood cells are being attacked by antibodies from ... Bonding, which also masks tooth stains, is when a thin coating of composite material is applied to the front of a person's ... It produces a yellow-brown discolouration and can also cause the enamel's smooth surface to be rough and pitted which causes ...

https://en.wikipedia.org/wiki/Tooth_whitening

membrane. • clathrin coat. • Cellbilen. • trans-Golgi network. • endolysosome membrane. • membrane coat. • clathrin-coated pit ... "A large-scale conformational change couples membrane recruitment to cargo binding in the AP2 clathrin adaptor complex.". Cell. ... endocytic vesicle membrane. • cytosol. • clathrin-coated endocytic vesicle membrane. • ... Wnt signaling pathway, planar cell polarity pathway. • membrane organization. • neurotransmitter receptor internalization. • ...

https://cy.wikipedia.org/wiki/AP2B1

The male gamete cell, sperm, is usually motile whereas the female gamete cell, the ovum, is generally larger and sessile. The ... In Greater Ani Crotophaga major this vaterite coating is thought to act as a shock absorber, protecting the calcite shell from ... Diagram of a fish egg: A. vitelline membrane B. chorion C. yolk D. oil globule E. perivitelline space F. embryo ... cassowary eggs are heavily pitted. Tiny pores in bird eggshells allow the embryo to breathe. The domestic hen's egg has around ...

https://en.m.wikipedia.org/wiki/Egg_

"The Plant Cell. 12 (7): 1031-1040. doi:10.1105/tpc.12.7.1031. ISSN 1040-4651. PMC 149047. PMID 10899972.. ... The pericarp of the fruit is fused with the seed coat referred to as "caryopsis", typical of the grasses, and the entire kernel ... They feature a large hopper that feeds the uniformly sized maize kernels (or wood pellets or cherry pits) into the fire. ... swelling or itching of mucous membranes, diarrhea, vomiting, asthma and, in severe cases, anaphylaxis. It is unclear how common ...

https://en.m.wikipedia.org/wiki/Maize

Each typically has a cell membrane formed of phospholipids, cytoplasm and a nucleus. All of the different cells of an animal ... In simple animals this may just be a coat of glycoproteins.[13] In more advanced animals, many glands are formed of epithelial ... Their forked tongues are used as organs of taste and smell and some species have sensory pits on their heads enabling them to ... The outer epithelial layer may include cells of several types including sensory cells, gland cells and stinging cells. There ...

https://en.wikipedia.org/wiki/Anatomy_and_physiology

Anker SD, Ponikowski P, Varney S, Chua TP, Clark AL, Webb-Peploe KM, Harrington D, Kox WJ, Poole-Wilson PA, Coats AJ (1997). " ... Hemodialysis with high-flux polyacrylonitrile membranes. ACE inhibitors are ADEC pregnancy category D, and should be avoided in ... Cell Mol Biol (Noisy le Grande). 47 (6): 1063-7. PMID 11785658.. [verification needed] ... a South American pit viper, in 1965.[64] Ferreira then went to John Vane's laboratory as a postdoctoral fellow with his already ...

https://en.m.wikipedia.org/wiki/ACE_inhibitors

Cell. 1978 Nov;15(3):919-33. [11] Coated pits, coated vesicles, and receptor-mediated endocytosis. Nature. 1979 Jun 21;279(5715 ... Cell. 1994 Apr 8;77(1):53-62 [49] Sterol-regulated release of SREBP-2 from cell membranes requires two sequential cleavages, ... Cell. 1977 Nov;12(3):629-41. [9] A mutation that impairs the ability of lipoprotein receptors to localise in coated pits on the ... Cell. 1983 Mar;32(3):941-51. [19] Depletion of intracellular potassium arrests coated pit formation and receptor-mediated ...

https://kk.wikipedia.org/wiki/Майкл_Стюарт_Браун

Suzuki, E. (2002). "High-resolution scanning electron microscopy of immunogold-labelled cells by the use of thin plasma coating ... "Peeking into Pit Fields: A Multiple Twinning Model of Secondary Plasmodesmata Formation in Tobacco". Plant Cell. 20 (6): 1504- ... Freeze-fracturing, freeze-etch or freeze-and-break is a preparation method particularly useful for examining lipid membranes ... Epidermal cells from the inner surface of an onion flake. Beneath the shagreen-like cell walls one can see nuclei and small ...

https://en.wikipedia.org/wiki/Scanning_electron_microscope

... itself upon fusing with a single sperm cell and thereby changes its cell membrane to prevent fusion with other sperm. Zinc ... These contents digest the jelly coat and eventually the vitelline membrane. In addition to the release of acrosomal vesicles, ... contained in the central cell) in the centre of the gametophyte. The resulting cell is triploid (3n). This triploid cell ... In flowering plants a second fertilisation event involves another sperm cell and the central cell which is a second female ...

https://en.wikipedia.org/wiki/Fertilization

Within these were cells of six stages. The cells could be operated independently, or consecutively within a section. Similarly ... To prevent predetonation by an external neutron, the tamper was coated in a thin layer of boron.[201] A polonium-beryllium ... The idea was that such boxes could be formed into a cascade of pumps and membranes, with each successive stage containing a ... The hemispheres for the first plutonium pit (or core) were produced and delivered on 2 July 1945. Three more hemispheres ...

https://en.m.wikipedia.org/wiki/Manhattan_District

Coated pits, cell-membrane Specialised regions of the cell membrane composed of pits coated with a bristle covering made of the ... These pits are the entry route for macromolecules bound by cell surface receptors. The pits are then internalised into the ... Retrieved from "https://www.biology-online.org/dictionary/index.php?title=Coated_pits_cell-membrane&oldid=32083" ...

https://www.biology-online.org/dictionary/Coated_pits_cell-membrane

The coated vesicle fuses with cytoplasmic endosomes (membrane-enclosed vesicles) and then with cell organelles called lysosomes ... of the membrane called a coated pit, which is lined by a special protein known as clathrin. As the coated pit invaginates, it ... is pinched off in the cytoplasm to form a coated vesicle. ... of the membrane called a coated pit, which is lined by a ... As the coated pit invaginates, it is pinched off in the cytoplasm to form a coated vesicle. The coated vesicle fuses with ...

https://www.britannica.com/science/coated-pit

Clathrin was not endocytosed with the insulin receptor and the inhibitor of clathrin-coated pit-mediated endocytosis, ... Cell membranes Is the Subject Area "Cell membranes" applicable to this article? Yes. No. ... Coated pits Is the Subject Area "Coated pits" applicable to this article? Yes. No. ...

https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0005985

Cell membrane {ECO:0000250}. Membrane, CC coated pit {ECO:0000250}; Peripheral membrane protein CC {ECO:0000250}; Cytoplasmic ... KW Cell membrane; Coated pit; Complete proteome; Endocytosis; Membrane; KW Protein transport; Reference proteome; Transport. FT ... DR GO; GO:0051285; C:cell cortex of cell tip; IDA:PomBase. DR GO; GO:0032153; C:cell division site; IDA:PomBase. DR GO; GO: ... the coat surrounding the cytoplasmic face of coated vesicles in CC the plasma membrane. {ECO:0000250}. CC -!- SIMILARITY: ...

http://pbil.univ-lyon1.fr/cgi-bin/acnuc-search-ac?query=O43005&db=SWISSPROT&ident=ACNUC22857

... confocal microscopy to study the formation of clathrin-coated structures at the plasma membranes of BSC1 and HeLa cells ... Conclusions/Significance These results suggest that AP-2 is essential for endocytic clathrin coated-pit and coated-vesicle ... These observations suggest that AP-2 is essential for endocytic coated-pit and coated-vesicle formation. We also find that AP-2 ... They also indicate that under normal conditions, functional endocytic clathrin coated pits are required for LDL internalization ...

https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0010597

Coated Pits, Cell-membrane. Specialized regions of the cell membrane composed of pits coated with a bristle covering made of ... These pits are the entry route for macromolecules bound by cell surface receptors. The pits are then internalized into the ... The cellulose acetate based membranes with polyvinylpyrrolidone coated silver nanoparticles,.... Influence of salinity on the ... ERASE Silver Coated Foley Catheter, Comparator Silver Coated Catheter. Location. Oconnee Regional Medical Center. ...

https://www.bioportfolio.com/resources/trial/166763/Study-to-Compare-CAUTI-Rates-Following-ERASE-CAUTI-Tray-Silver-vs-Silver.html

Functions as a cell surface receptor and performs physiological functions on the surface of neurons relevant to neurite growth ... Plasma Membrane. *clathrin-coated pit Source: UniProtKB-SubCell. *. Other locations. *cell surface Source: UniProtKB-SubCell ... Plasma membrane. *Cell membrane UniRule annotation. Automatic assertion according to rulesi ... Membrane. ,p>This section describes post-translational modifications (PTMs) and/or processing events.,p>,a href=/help/ptm_ ...

https://www.uniprot.org/uniprot/Q6GR78

We report super-resolution fluorescence imaging of live cells with high spatiotemporal resolution using stochastic optical ... Coated Pits, Cell-Membrane / metabolism * Endocytosis * Fluorescent Dyes * Image Processing, Computer-Assisted / methods ... and 3D super-resolution images of living cells, using clathrin-coated pits and the transferrin cargo as model systems. Bright, ... Fast, three-dimensional super-resolution imaging of live cells Nat Methods. 2011 Jun;8(6):499-508. doi: 10.1038/nmeth.1605. ...

https://pubmed.ncbi.nlm.nih.gov/21552254/?dopt=Abstract

receptor mediated* endocytosis... uptake @ membrane sites w receptors. - coated pits with protein clathrin Sumanas, Inc. ... How Things Get In/Out of Cells The Cell Membrane.... 1. Unit Membrane Hypothesis - all membranes look alike*. ... cell wall Fluid Mosaic model* & Extra-cellular Matrix*-common to animal cells. Functions of Membrane Proteins*. Concept ... Membrane Transport Concept Activity - chapter 7.2 - Selective Permeability of Membranes,. Concept Activity - chapter 7.3 - ...

http://fig.cox.miami.edu/~cmallery/150/memb/membranes.htm

Cell membrane. Membrane , coated pit. AP-2 appears to be excluded from internalizing CCVs and to disengage from sites of ... Lane 1 : HEK293 cell lysate. Lane 2 : SKBR-3 cell lysate. Lane 3 : MCF-7 cell lysate. Lysates/proteins at 20 µg per lane.. ... Lane 1 : MCF-7 cell lysate. Lane 2 : SKBR-3 cell lysate. Lysates/proteins at 10 µg per lane.. Secondary. All lanes : HRP ... in membrane-associated AP-2. The membrane-specific phosphorylation event appears to involve assembled clathrin which activates ...

http://www.abcam.com/ap2m1-antibody-ep2695y-ab75995.html

PE 1: Evidence at protein level; KW Calcium; Cell membrane; Cell projection; Coated pit; KW Complete proteome; Disulfide bond; ... Membrane, coated pit CC {ECO:0000269,PubMed:22340494}. Cell projection, dendrite CC {ECO:0000269,PubMed:20637285}. Cell ... DR GO; GO:0009986; C:cell surface; ISO:MGI. DR GO; GO:0005905; C:clathrin-coated pit; IDA:MGI. DR GO; GO:0005737; C:cytoplasm; ... DR GO; GO:0045177; C:apical part of cell; IDA:MGI. DR GO; GO:0016324; C:apical plasma membrane; IDA:UniProtKB. DR GO; GO: ...

https://www.genome.jp/dbget-bin/www_bget?uniprot:A2ARV4

Cell membrane. Membrane , coated pit. AP-2 appears to be excluded from internalizing CCVs and to disengage from sites of ... Lane 1 : 293T cell lysate Lane 2 : 293T cell lysate treated with Calyculin A. Lysates/proteins at 10 µg per lane.. Predicted ... in membrane-associated AP-2. The membrane-specific phosphorylation event appears to involve assembled clathrin which activates ... Cell Biology. Epigenetics. Metabolism. Developmental Biology. By research area. Immunology. Microbiology. Neuroscience. Signal ...

http://www.abcam.com/ap2m1-phospho-t156-antibody-epr4700-ab109397.html

Cell membrane. Membrane, coated pit. Peripheral membrane protein. Cytoplasmic side. Note=AP-2 appears to be excluded from ... Plasma membrane Cytoskeleton Lysosome Endosome Peroxisome ER Golgi Apparatus Nucleus Mitochondrion 0 1 2 3 4 5 Confidence ... Cell Line Products. * Browse ESI BIO Cell Lines and PureStem Progenitors for AP2A1 ... The complex is part of the protein coat on the cytoplasmic face of coated vesicles which links clathrin to receptors in ... See ...

https://www.genecards.org/cgi-bin/carddisp.pl?gene=AP2A1&keywords=GH19J049771&prefilter=genomic_location

Cell membrane. Membrane, coated pit; Peripheral membrane protein; Cytoplasmic side. Note=AP-2 appears to be excluded from ... Plasma membrane Cytoskeleton Lysosome Endosome Peroxisome ER Golgi Apparatus Nucleus Mitochondrion 0 1 2 3 4 5 Confidence ... The complex is part of the protein coat on the cytoplasmic face of coated vesicles which links clathrin to receptors in ... Nef-mediates down modulation of cell surface receptors by recruiting them to clathrin adapters. Nef-mediates down modulation of ...

https://www.genecards.org/cgi-bin/carddisp.pl?gene=AP2A1

May play a role in transporting DAB2 from the plasma membrane to specific cellular targets (By similarity). May play a role in ... Appears to be involved in a very early step of clathrin-mediated endocytosis in polarized epithelial cells (By similarity). May ... Functions in a variety of intracellular processes such as vesicular membrane trafficking and cell migration (By similarity). ... Cell membrane, Cell projection, Coated pit, Cytoplasm, Cytoplasmic vesicle, Golgi apparatus, Membrane, Nucleus ...

https://www.uniprot.org/uniprot/Q9I8D1

https://en.wikipedia.org/wiki/Receptor-mediated_endocytosis

It occurs on the membrane via clathrin-coated pits (CCPs). In this thesis, we studied CCPs behavior when cells are under ... Seeding cells on anisotropic fibronectin patterns, we were able to manipulate where and how long CCPs appear on the cell. ... is one of the major pathway through which cells internalize nutrients and membrane proteins. ... Together, these results showed that CCPs distribution and behavior are regulated by mechanical cues in a cell. In the last ...

https://deepblue.lib.umich.edu/handle/2027.42/144015

Podocytes secrete and maintain the basement membrane. There are numerous coated vesicles and coated pits along the basolateral ... Podocytes are cells in the Bowmans capsule in the kidneys that wrap around capillaries of the glomerulus. Podocytes make up ... List of human cell types derived from the germ layers "Podocyte" at Dorlands Medical Dictionary Lote, Christopher J. ... Cell. Biol. 23 (10): 3575-82. doi:10.1128/mcb.23.10.3575-3582.2003. PMC 164754. PMID 12724416. Ciani L; Massella L; Ruggiero B ...

https://en.wikipedia.org/wiki/Podocyte

The cells were also co-transfected with β2-YFP to mark coated pits. Fig. 6 demonstrates that, after incubation of cells ... Spatial control of coated-pit dynamics in living cells. Nat. Cell Biol. 1, 1-7. ... called clathrin-coated pits. Ligand-receptor complexes destined for internalization are selectively recruited into coated pits ... In our experiments, EGF and transferrin receptors were efficiently recruited into coated pits in cells overexpressing Rab5(S34N ...

http://jcs.biologists.org/content/116/23/4799.long

clathrin coat of coated pit Human retinal pigmented epithelial (RPE) cells labeled for clathrin-coated pits (green), focal ... negative regulation of cell adhesion involved in substrate-bound cell migration Cellular Component. cell-substrate adherens ... cell communication Cellular Component. gap junction Replica of a freeze-fractured gap junction presents the inner half-membrane ... cell cortex The cortex of Paramecium consists of a plasma membrane and alveolar sacs, with their inner and outer alveolar ...

http://cellimagelibrary.org/browse/cellcomponent/Plasma%20Membrane?per_page=10&page=1

Phosphoinositide-AP-2 interactions required for targeting to plasma membrane clathrin-coated pits. J. Cell Biol. 146:755-764. ... Clathrin-coated pits contain an integral membrane protein that binds the AP-2 subunit with high affinity. J. Biol. Chem. 265: ... Clathrin-coated vesicles in nervous tissue are involved primarily in synaptic vesicle recycling. J. Cell Biol. 118:1379-1388. ... The classical whole-cell configuration was obtained by rupturing the patch membrane of a gigaohm seal formed between the ...

http://jcb.rupress.org/content/183/5/881

https://en.wikipedia.org/wiki/Cholesterol

2002). Curvature of clathrin-coated pits driven by epsin. Nature 419, 361-366. doi:10.1038/nature01020. ... 1996). Modulation of membrane dynamics and cell motility by membrane tension. Trends Cell Biol. 6, 85-89. doi:10.1016/0962-8924 ... Live-cell imaging. Live cell imaging of COS7 cells, HEK293 cells, and neuronal cultures were imaged using Leica TCS confocal ... A) Whole-cell image of a cortical neuron coexpressing F-BAR(1)-EGFP and LifeAct-mRFPruby. (B-I) F-BAR(1)-coated membrane shows ...

http://jcs.biologists.org/content/125/14/3390

HeLa cells expressing LCb-RFP and Dyn-2-EGFP were imaged by spinning disk microscopy. The fluorescenc ... Clathrin-Coated Vesicles/metabolism*/ultrastructure. *Coated Pits, Cell-Membrane/metabolism*/ultrastructure. *Dynamins/ ... Flat clathrin lattices: stable features of the plasma membrane. Grove J, Metcalf DJ, Knight AE, Wavre-Shapton ST, Sun T, ... HeLa cells expressing LCb-RFP and Dyn-2-EGFP were imaged by spinning disk microscopy. The fluorescence signals associated with ...

https://openi.nlm.nih.gov/detailedresult.php?img=PMC4230618_3581fig4&req=4

... and other molecules involved in communication between cells. ... and membrane scission observed in live cells. Cell 121: 593-606 ... Coupling between clathrin-coated-pit invagination, cortactin recruitment, ... The Nanomechanics of Endocytosis and Exocytosis in Live Cells. Jahn, R., T. Lang & T. C. Sudhof. 2003. Membrane fusion. Cell ... Exocytosis of single chromaffin granules in cell-free inside-out membrane patches. Nat. Cell Biol. 5: 358-362.. Dernick, G., L ...

https://www.nyas.org/ebriefings/kavli-workshop-in-pucon/

Membrane, coated pit {ECO:0000250,UniProtKB:P17427}; Peripheral membrane protein {ECO:0000250,UniProtKB:P17427}; Cytoplasmic ... CHO Cells. Purified From HEK 293 Cell culture Supernatant.. Goat. chicken. Sheep. Swine. Donkey. Guinea Pig. Horse. Hamster. ... Cell membrane {ECO:0000250,UniProtKB:P17427}; Peripheral membrane protein {ECO:0000250,UniProtKB:P17427}; Cytoplasmic side {ECO ... All lanes : Anti-AP2A2 Antibody (Center) at 1:1000 dilution Lane 1: A431 whole cell lysate Lane 2: HepG2 whole cell lysate ...

http://www.abgent.com/products/AP8551c-AP2A2-Antibody-Center

b) Binding of WNV particle at the plasma membrane of Vero cells. (c) Uptake of WNV particle (arrow) by coated pit (arrowheads ... Inhibition of clathrin-coated pit assembly by an Eps15 mutant. J. Cell Sci.112(Pt. 9):1303-1311. ... the inhibition of clathrin-coated pits formation at the plasma membrane did not affect the binding of WNV particles to the cell ... The formation of clathrin-coated pits at the plasma membrane during the process of receptor-mediated endocytosis requires the ...

https://jvi.asm.org/content/78/19/10543?ijkey=66ba12955177a652a2becc0ea743db643e28912f&keytype2=tf_ipsecsha

Phosphoinositide-AP-2 interactions required for targeting to plasma membrane clathrin-coated pits. J. Cell Biol. 146:755-764. ... to the membranes at which clathrin-coated pits nucleate. A GTPγS-stimulated recruitment of clathrin/AP-2 coats to endosomes was ... Recruitment of coat proteins onto Golgi membranes in intact and permeabilized cells: effects of brefeldin A and G protein ... Consistent with its effects on clathrin/AP-2-coated pit formation and with previous observations (Malecz et al., 2000), cells ...

http://jcb.rupress.org/content/162/1/113

Clathrin-mediated endocytosis shuts down during mitosis in eukaryotic cells because all of the required actin is hoarded by the ... From prophase to anaphase, shallow clathrin-coated pits form at the plasma membrane, but the cell never internalizes them. ... The second theory suggested that elevated tension in the plasma membrane prevents clathrin-coated pits from pinching off into ... is sequestered at the cell cortex, and CME cant proceed because actin is required to help stretch the clathrin-coated pits to ...

https://www.the-scientist.com/the-literature/inactive-actin-37576

Clathrin-coated vesicles are important vehicles of membrane traffic in cells. - Stock Image C015/6790 ... The fibrous protein forms a characteristic polyhedral coat on the surface of coated pits and coated vesicles. ... and coated pits and appears to be involved in protein secretion and membrane trafficking. This protein also occurs in synaptic ... The polyhedral protein lattice coats eukaryotic cell membranes (vesicles) ...

http://www.sciencephoto.com/media/507311/view/clathrin-lattice-molecular-model

As the coated pit invaginates, it is pinched off in the cytoplasm to form a coated vesicle. (britannica.com)

A cell surface depression that is coated with clathrin on its cytoplasmic surface and functions in receptor-mediated endocytosis. (thefreedictionary.com)

Tracers appeared in coated pits and large coated vesicles, endosomes of varying sizes, multivesicular bodies, and lysosomes (Hermo, 1995). (thefreedictionary.com)

We will determine how PI4,5P2, cargo, clathrin and endocytic accessory factor binding to AP2, as well as phosphorylation events trigger conformational changes in AP2 to regulate initial events in clathrin coated pit (CCP) assembly, stabilization of nascent CCPs and their maturation. (thefreedictionary.com)

Our first indication that epsin affected membrane curvature was the tubulation of PtdIns(4,5)P 2 liposomes. (endocytosis.org)
Thus we believe that epsin drives membrane curvature in a clathrin-coated pit. (endocytosis.org)

Class 5 sequence variations produce receptors that bind ligands in coated pits but fail to release them at acidic pH in endosomes, and thus do not recycle to the cell surface (13). (thefreedictionary.com)

of the membrane called a coated pit, which is lined by a special protein known as clathrin. (britannica.com)

There is also growing evidence of a large number of multivesicular bodies and other lysosomal components seen in these cells, indicating a high endocytic activity. (wikipedia.org)
Clathrin is recruited to endocytic sites on the plasma membrane by the AP2 adaptor complex. (rupress.org)
Agonist activation leads to sustained recruitment of CCR5 to FCLs.Quantitative molecular imaging indicated that FCLs partitioned receptors at the cell surface.Our observations suggest that FCLs provide stable platforms for the recruitment of endocytic cargo. (nih.gov)
Semliki Forest virus ( 27 ), vesicular stomatitis virus ( 18 ), influenza virus ( 30 ), ecotropic murine leukemia virus ( 2 , 34 , 44 ), and Hantaan virus ( 28 ) gain entry into cells through a pH-dependent endocytic pathway. (asm.org)
Royle's team is now addressing how the endocytic machinery is able to sense high membrane tension and recruit actin within cells of tissues undergoing physical stretching or in polarized epithelial cells, which have different tensions at their basolateral and apical membranes. (the-scientist.com)
Epsin is an evolutionarily conserved endocytic clathrin adaptor whose most critical function(s) in clathrin coat dynamics remain(s) elusive. (elifesciences.org)
Through understanding the various endocytic uptake pathways, mechanisms can be improved for successful non-viral delivery of therapeutic genes to the particular target cells, such as necessary for gene therapy (Khalil et al. (newworldencyclopedia.org)
Blocking endocytic membrane recycling affected the intracellular distribution of DAG but not of PI 4,5-P 2 . (plantcell.org)
We show that Nt PLC3 is targeted by its EF and C2 domains to the plasma membrane laterally at the pollen tube tip and that it maintains, together with endocytic membrane recycling, an apical domain enriched in PI 4,5-P 2 and DAG required for polar cell growth. (plantcell.org)
Clathrin-mediated endocytosis, an essential process for plasma membrane homeostasis and cell signaling, is characterized by stunning heterogeneity in the size and lifetime of clathrin-coated endocytic pits (CCPs). (sciencemag.org)
10 min) for plasma membrane organization ( 5 , 6 ) distinct from endocytic carriers (i.e. (sciencemag.org)
Endocytic CCPs display a wide heterogeneity in size and lifetime within cells that ranges from less than 20 s to a few minutes ( 7 - 10 ). (sciencemag.org)
The endocytic pathway of ricin in sinusoidal liver endothelial cells (EC) was traced by means of immunocytochemical labeling of ultrathin cryosections. (nih.gov)
Higher tensions inhibit both the binding of the endocytic complex to the membrane and mechanical deformation of the membrane during invagination. (rupress.org)
The protein encoded by this gene is an endocytic receptor involved in several cellular processes, including intracellular signaling, lipid homeostasis, and clearance of apoptotic cells. (mybiosource.com)
The AP (adaptor protein) complexes are heterotetrameric protein complexes that mediate intracellular membrane trafficking along endocytic and secretory transport pathways. (bioscirep.org)
The clathrin-mediated endocytic pathway is a major route for endocytosis, the mechanism by which many essential substances are transported into cells, particularly large polar molecules. (fredhutch.org)
During this process, clathrin and endocytic adaptors co-assemble to form clathrin-coated pits (CCP) in the membrane. (fredhutch.org)
Smad1/5 was shown to be phosphorylated independently of endocytic events at the cell surface. (uni-wuerzburg.de)
These findings propose an important regulatory impact of different endocytic routes and membrane regions on BMP signaling as well as that a distinct membrane localization of BMP receptors account for specific signaling properties initiated at PFCs or BISCs. (uni-wuerzburg.de)

Although the plasma membrane-localized activity of Rab5 was not detected by light microscopy, overexpression of a GDP-bound mutant of CFP-Rab5(S34N) inhibited internalization of the epidermal growth factor receptor by retaining receptors in clathrin-coated pits. (biologists.org)
A number of different internalization and trafficking pathways are utilized by animal viruses to gain entry into host cells. (asm.org)
After internalization of the TGF-alpha/EGFR complex, EGFR recycles back to the plasma membrane, where it can be restimulated. (nih.gov)
Clathrin-coated pits mediate the internalization of clustered receptors from the cell surface in a process termed receptor-mediated endocytosis. (sciencemag.org)
Among them, internalization via clathrin-coated pits, lipid raft/caveolae-mediated endocytosis and macropinocytosis/phagocytosis are the most extensively characterized. (nih.gov)
Absorptive endocytosis molecules are bound to the cell surface and concentrated before internalization, with the molecules interacting preferentially with generic complementary binding sites, such as lectin or charged interaction (Khalil et al. (newworldencyclopedia.org)
Furthermore, a very recent study has established targeted internalization of SWNTs into cancer cells that express specific cellsurface receptors and subsequent use as high near-infrared (NIR) absorbing agents for cancer-cell destruction without harming normal cells. (docme.ru)
Based on these features, tetraspanins might well become involved in exosome-recipient cell binding, which proceeds via receptor-ligand interaction, fusion, or internalization ( 8 , 13 , 17 , 25 ). (aacrjournals.org)
LPAR1 requires membrane cholesterol for association with beta-arrestin, which targets the receptor to clathrin-coated pits for internalization. (atlasgeneticsoncology.org)
Nanosilicate attachment to the cell membrane and subsequent cellular internalization activated stress-responsive pathways such as mitogen-activated protein kinase (MAPK), which subsequently directed hMSC differentiation toward osteogenic and chondrogenic lineages. (pnas.org)
The intracellular portion of the 85 kd subunit contains a consensus NP x Y sequence known to be essential for internalization of receptors via coated pits. (springer.com)
Our hypothesis is that agLDL internalization by vascular smooth muscle cells (VSMCs) may trigger TF-procoagulant activity. (ahajournals.org)
We analyzed the impact of ligand aggregation and LPS-induced signaling on CD14-dependent LPS internalization kinetics in human monocytic THP-1 cells and murine macrophages. (jimmunol.org)
In addition, pre-exposure of THP-1 cells to LPS had no effect on their ability to internalize subsequently added LPS, and pre-exposure of the cells to the LPS-specific inhibitor, LA-14-PP, inhibited stimulation of the cells without inhibiting LPS internalization. (jimmunol.org)
Exposure to Cdt results in binding to the cell surface followed by internalization and translocation of the active subunit, CdtB, to intracellular compartments. (frontiersin.org)
Initial evidence for hormones acting through cell surface receptors came from studies using antibodies to peptide hormones that caused cross-linking of hormone-receptor complexes, preventing mobility in the membrane and internalization, thereby blocking or reversing the biologic effects of these hormones. (glowm.com)

These pits are the entry route for macromolecules bound by cell surface receptors . (biology-online.org)
Although receptors and their ligands can be brought into the cell through a few mechanisms (e.g. caveolin ), clathrin -mediated endocytosis remains the best studied. (wikipedia.org)
Clathrin-mediated endocytosis of many receptor types begins with the cargo ligands in the luminal compartment of the cell binding to receptors on the cell membrane. (wikipedia.org)
[1] Other receptors can nucleate a clathrin-coated pit allowing formation around the receptor. (wikipedia.org)
To achieve internalisation of nanoparticles into cells, such as T cells , antibodies can be used to target the nanoparticles to specific receptors on the cell surface (such as CCR5 ). (wikipedia.org)
Overexpression of CFP-Rab5(S34N)CAAX prevented endocytosis of receptors by retaining them in coated pits. (biologists.org)
Some receptors are recycled back to the plasma membrane with or without the ligand, whereas others are sent to the late endosomal compartment and lysosomes for degradation ( Sorkin and von Zastrow, 2002 ). (biologists.org)
Conner and Schmid overexpressed an accessory kinase that inhibits AP-2 function and similarly found selective effects on the uptake of different receptors from the cell surface. (sciencemag.org)
These are probably mediated through specific cell-surface interactions with chemoattractant receptors on cells of the immune system and key enzymes of the fibrinolytic cascade, respectively. (nature.com)
The interaction of the G protein and specific cell surface receptors may be involved. (majortests.com)
Illustration of receptor-mediated endocytosis, where receptors on cells allow them to engulf target molecules (red). (sciencephoto.com)
It is a requirement of G protein-coupled receptor functioning that receptors are embedded into membranes for proper structure. (atlasgeneticsoncology.org)
It was found that QDs interact with scavenger receptors, and enter cells via a clathrin coated pit mediated pathway. (cdc.gov)
cholinergic r's membrane receptors on cells of effector organs, innervated by cholinergic nerve fibers and responsive to the acetylcholine secreted by these fibers. (thefreedictionary.com)
Fc r's specific membrane receptors for antigen-antibody complexes or aggregated immunoglobulins that bind a site in the Fc portion of the immunoglobulin molecule and may exhibit specificity for particular immunoglobulin classes. (thefreedictionary.com)
MRs may be considered an efficient and fairly rapid cell-activated mechanism to express or mask surface receptors aimed at triggering specific response pathways. (hindawi.com)
[9] A mutation that impairs the ability of lipoprotein receptors to localise in coated pits on the cell surface of human fibroblasts. (wikipedia.org)
2014 ). Whereas the former phenomenon depends on the leakiness of tumor vessels (defined as enhanced permeability and retention or EPR effect) (Jain and Stylianopoulos 2010 ), the latter involves surface functionalization of NPs with ligands specific to receptors on the tumor cell surface. (springer.com)
Death receptors were initially recognised as potent inducers of apoptotic cell death and soon ambitious attempts were made to exploit selective ignition of controlled cellular suicide as therapeutic strategy in malignant diseases. (mdpi.com)
At the time of discovery, a subgroup of the TNFRSF, the so-called death receptors (DR), attracted considerable interest as robust cell-death induction upon ligand binding was recognised and triggered the ambitious goal for exploitation in therapeutic settings such as cancer therapy. (mdpi.com)
Receptors without the O-linked glycosylation are cleaved inside the cell with release of the extracellular domain. (ifcc.org)
Acetylated Low Density Lipoprotein (AcLDL) is taken up by cells via scavenger receptors and has been used as a mechanism of targeted drug delivery and in combination with saporin for the depletion of specific cell types. (origene.com)
The Ap2-EH domain complexes in CCS are thought to be unable to drive endocytosis of integrin beta 1-loaded pits because, in these cases, the complexes are not bound to receptors. (fredhutch.org)
Membrane receptors compose some of the cargoes that are internalized via clathrin-mediated endocytosis (CME). (fredhutch.org)
2 , 3 In contrast, antibodies to steroid hormones could not achieve the same effects, suggesting that steroid hormone receptors were not located on the cell surface. (glowm.com)
there have since been numerous studies demonstrating that functional cell membrane receptors are also present in intracellular organelles and that steroid hormone receptors are present on the cell surface. (glowm.com)
4 In the ensuing years, there has been a virtual explosion of information on cell membrane receptors and on the signal transducers and effectors that mediate hormone action in the cell. (glowm.com)
The binding of peptide hormones, growth factors, cytokines, or eicosanoids to cell membrane receptors activates one or more signal transduction systems, which initiate different cascades of events that alter the concentration of intracellular second messengers, such as cAMP or Ca 2+ . (glowm.com)
Most cell membrane receptors can be grouped into three major classes on the basis of the transducer and effector systems that mediate their action in the cell 5 ( Table 1 ). (glowm.com)
Not all membrane hormone receptors fall neatly into one of these three major classes. (glowm.com)
Its malfunctioning can cause several pathologies, e.g. by controlling the level of receptors at the cell surface. (uni-wuerzburg.de)
In the present work, the localization of BMP receptors in distinct membrane domains and the consequential impact on BMP signaling were investigated. (uni-wuerzburg.de)
Although these results point to a caveolar localization, BMP receptors cofractionated also with DRMs in cells exhibiting no caveolae, suggesting an additional non-caveolar raft localization. (uni-wuerzburg.de)

Appears to be involved in a very early step of clathrin-mediated endocytosis in polarized epithelial cells (By similarity). (uniprot.org)
Although various viscera have epithelial layers, the name visceral epithelial cells usually refers specifically to podocytes, which are specialized epithelial cells that reside in the visceral layer of the capsule. (wikipedia.org)
Transmission electron micrograph of two frog epithelial cell cells showing the tight junction complex running horizontally in this image. (cellimagelibrary.org)
Electron micrograph of the junctional complex of intestinal epithelial cells of the rat shows the apical-most zonula occludens (tight junction), the zonula adherens (medium junction) and the macula ad. (cellimagelibrary.org)
Human retinal pigmented epithelial (RPE) cells labeled for clathrin-coated pits (green), focal adhesions (red) and nuclei (blue). (cellimagelibrary.org)
Human induced pluripotent stem cells differentiate into retinal pigment epithelial cells. (nih.gov)
Transforming growth factor-{alpha} enhances corneal epithelial cell migration by promoting EGFR recycling. (nih.gov)
Telomerase immortalized human corneal epithelial (hTCEpi) cells and primary human corneal epithelial cells were tested for their ability to migrate in response to EGF and TGF-alpha. (nih.gov)
TGF-alpha, compared with EGF, is a more potent activator of corneal epithelial cell migration. (nih.gov)
TGF-α is a more efficacious activator of primary corneal epithelial cell migration than EGF. (nih.gov)
After incubation in the indicated amounts of ligand, primary human corneal epithelial cells were fixed and stained with Giemsa, and cells at the origin (top of membrane) were removed. (nih.gov)
Some evidence indicates that a portion of the total cellular LPAR1 localizes to the nuclear membrane in PC12 cells, micro-vascular endothelial cells, and human bronchial epithelial cells. (atlasgeneticsoncology.org)
Immunocytochemistry/ Immunofluorescence: LDL R Antibody (C7) [NBP1-78159] - Image from a customer review on porcine intestinal epithelial cells IPEC-J2. (novusbio.com)
AP-1 also mediates basolateral sorting in epithelial cells. (bioscirep.org)
Distinct pools of PtdIns(3,4,5)P 3 in the plasma membrane control such processes as the formation of the basolateral membrane in epithelial cells ( 7 ), orientation of the mitotic spindle in adherent cells ( 8 ), and formation of the axonal growth cone in neurons ( 9 ). (sciencemag.org)
Most epithelial cells contain two AP-1 clathrin adaptor complexes. (rupress.org)
The transport of iron into the brain is regulated by the expression of the transferrin receptor on capillary endothelial cells and on epithelial cells in the choroid plexus. (ifcc.org)
To examine this possibility, we investigated the effects of siRNA-mediated OCRL1 knockdown on biosynthetic and postendocytic membrane traffic in canine and human renal epithelial cells. (physiology.org)
Megalin, a member of the LDL receptor family, is a 600-kDa transmembrane protein that recycles at the apical domain of polarized epithelial cells ( 10 ). (physiology.org)
Invasion of non-phagocytic cells (i.e., epithelial, fibroblast and endothelial cells) involves either a trigger or a zipper mechanism mediated by the T3SS-1 or the invasin Rck, respectively. (frontiersin.org)

Activated Rab5 was detected by FRET microscopy in endosomal compartments and often concentrated in microdomains in the endosomal membrane. (biologists.org)
Membranes divide cells into compartments, and remodeling of those membranes is an important step in any change of cell size or transfer of components to and from the surface. (news-medical.net)
Dr. Greene studies the role of molecular chaperones and their co-factors in the formation of vesicular compartments from clathrin-coated pits in the cellular membrane during endocytosis. (nih.gov)
Upon ligand binding, receptor recruitment in specialized membrane compartments, formation of receptor-ligand clusters and internalisation processes constitute key regulatory elements. (mdpi.com)
These five AP complexes localize to different intracellular compartments and mediate membrane trafficking in distinct pathways. (bioscirep.org)
In addition, the cells of higher organisms contain specialized intracellular membrane compartments, which interact with each other and with the plasma membrane. (lmu.de)
Following assembly with β2-microglobulin in the endoplasmic reticulum, all CD1 isoforms are transported to the cell surface but are subsequently delivered to distinct endosomal and/or lysosomal compartments. (jci.org)
In order to deliver CdtB to intracellular compartments the holotoxin must first bind to target cell surfaces. (frontiersin.org)

RESTORATION HARDWARE: During interphase, mammalian cells have low membrane tension, and clathrin-mediated endocytosis (CME) proceeds normally with no special need for actin (1). (the-scientist.com)
Phagocytosis generally is restricted to specialized phagocytic mammalian cells, such as macrophages, monocytes, and neutrohiles, which help to clear large pathogens such as bacteria or yeast , or debris such as dead cells and fat deposits in arteries (Khalil et al. (newworldencyclopedia.org)
Mitosis in mammalian cells is accompanied by a dramatic inhibition of endocytosis. (rupress.org)
CDT uptake and intracellular transport in mammalian cells. (asmblog.org)
Cholesterol is required in the membrane of mammalian cells for normal cellular function, and is either synthesized in the endoplasmic reticulum , or derived from the diet, in which case it is delivered by the bloodstream in low-density lipoproteins . (wikidoc.org)
Molecules of the tumor necrosis factor (TNF) superfamily (TNFSF) and TNF-receptor superfamily (TNFRSF) are highly conserved and found in almost all mammalian cells. (mdpi.com)

J. Cell Biol. (sciencemag.org)
Methods Cell Biol. (currentprotocols.com)
Eur J Cell Biol. (nih.gov)
J Cell Biol (1999) 144 (3): 497-506. (rupress.org)
J Cell Biol 1990;110:1041-8. (springer.com)
J Cell Biol (2003) 163 (2): 351-362. (rupress.org)

These findings therefore imply that the immunological defects observed in the patient cohort can be attributed to a failure to initiate endocytosis at the plasma membrane. (lmu.de)
The major research topic in the group aims to elucidate the highly dynamic process of endocytosis at the plasma membrane in plant cells. (vib.be)

F-BAR domain only protein 1 (FCHo1) belongs to the F-BAR family, whose members have been implicated in cell membrane processes such as membrane invagination, tubulation and endocytosis [ PMID: 23384583 ]. (ebi.ac.uk)
Our results indicate that a key evolutionary conserved function of epsin, in addition to other roles that include, as we show here, a low affinity interaction with SNAREs, is to help generate the force that leads to invagination and then fission of clathrin-coated pits. (elifesciences.org)
The deep invagination of clathrin-coated pits that leads to fission is assisted by actin, a protein that assembles into filaments that are suggested to generate the forces needed for this process. (elifesciences.org)
2006) succinctly define endocytosis as "the cellular uptake of macromolecules and solutes into membrane-bound vesiciles derived by the invagination and pinching off of pieces of the plasma membrane. (newworldencyclopedia.org)

and once the membrane is invaginated, a protein such as dynactin may be responsible for the fission event. (rupress.org)

In contrast, human immunodeficiency virus type 1 ( 33 , 34 ), severe acute respiratory syndrome coronavirus ( 43 ), and amphotrophic murine leukemia virus ( 34 ) are observed to fuse at the plasma membrane and the nucleocapsids are released into the cytoplasm. (asm.org)
The family Flaviviridae are positive-sense, single-stranded RNA viruses that replicate in the cytoplasm of infected cells. (asm.org)
After adsorption, the virus penetrates the host cell and enters the cytoplasm by pinocytosis (via clathrin-coated pits). (majortests.com)
The viral membranes fuse to the endosomal membranes, causing the release of viral RNP into the cytoplasm (uncoating). (majortests.com)
Some investigators thought viruses were directly penetrating the cell membrane into the cytoplasm, while others argued the pathogens were first engulfed into clathrin-coated pits. (the-scientist.com)

MRC Laboratory for Molecular Cell Biology, London WC1E 6BT, United Kingdom Institute of Immunity and Transplantation, University College London, London NW3 2PF, United Kingdom [email protected] [email protected] (nih.gov)
So Stone ordered skin biopsies from Despota and his parents and sent the cells to a pair of young researchers who had carved a niche in cholesterol biology at the University of Texas Southwestern Medical School in Dallas, TX. (pnas.org)
When Despota's cells arrived in Texas, Michael Brown and Joseph Goldstein, now feted in biochemists' circles, had made substantial inroads into the biology of cholesterol metabolism in human cells. (pnas.org)
The Laboratory of Cell Biology is led by Dr. Edward Korn, who has been studying the function and regulation of the actomyosin system in its diverse forms since he discovered the first unconventional non-filamentous myosin, myosin I (containing only a single heavy chain), in the single-cell soil protozoan Acanthamoeba castellanii , approximately forty years ago. (nih.gov)
Dr. Korn's laboratory brings the tools of biochemistry and cell biology to focus on three research areas: the role of the actin cytoskeleton in Dictyostelium fruiting body development, the molecular basis of the regulation of actin-activated ATPase activity in myosin II, and the mechanism of association of myosin I with cell membranes. (nih.gov)
She has applied her wealth of experience in the cell biology of protein folding and membrane trafficking toward deciphering the mechanisms of prion formation and propagation. (nih.gov)
It has recently emerged that clathrin functions as a scaffold for actin assembly, in the context of both pathogen infection and cell biology. (nature.com)
Cell Biology and Metabolism Program, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland, 20892, U.S.A. (bioscirep.org)
If you are interested to work on the interplay between cell and structural biology, please contact us. (vib.be)
Journal of Cell Biology , 97 (2), 533-541. (elsevier.com)

Cholesterol is essential for the structure and function of invaginated caveolae and clathrin-coated pits, including caveola-dependent and clathrin-dependent endocytosis. (wikipedia.org)
MRs have been described in two forms, either flat portions of plasma membrane, named lipid rafts, or flask-like of about 70 nm in diameter, named caveolae. (hindawi.com)
The role of cholesterol in caveolae-dependent and clathrin-dependent endocytosis can be investigated by using methyl beta cyclodextrin (MβCD) to remove cholesterol from the plasma membrane. (wikidoc.org)
Cell membrane transit by virus was seen to involve two distinct structures resembling caveolae and macropinosomes. (arvojournals.org)
By separating detergent-resistant membranes (DRMs) from cell lysates and subsequent gradient ultracentrifugation, it could be demonstrated that BRI and BRII cofractionate with cav-1, the marker protein of caveolae. (uni-wuerzburg.de)

It is widely used for the specific uptake of certain substances required by the cell (examples include LDL via the LDL receptor or iron via transferrin ). (wikipedia.org)
Endocytosis, or the vesicular uptake of extracellular materials, is a means whereby the macromolecules can be internalized by a cell. (newworldencyclopedia.org)
Clathrin-mediated endocytosis (CME) is an essential cell physiological process that dynamically controls the composition of the plasma membrane and thereby regulates a plethora of functions ranging from nutrient uptake and cell signaling to the formation of morphogen gradients and synaptic transmission ( 1 - 3 ). (sciencemag.org)
Activation of this pathway results in up-regulation of ACKR2 from endosomal compartment to cell membrane, increasing its efficiency in chemokine uptake and degradation. (avivasysbio.com)
CD1a mediates the presentation of nonpeptide antigens to T cells, while langerin facilitates uptake of microbial fragments and perhaps their delivery to a specialized subcellular compartment. (jci.org)
The receptor-apotransferrin complex recycles to the cell surface for a renewed round of iron uptake. (ifcc.org)
Despite these prominent roles in LPS uptake by cells, however, mCD14 is not thought to transduce LPS signals across the plasma membrane ( 7 , 8 , 9 , 10 ). (jimmunol.org)

A and B, Immunogold labeling of AQP2 in clathrin-coated pits (arrows) at the apical plasma membrane of collecting duct principal cells. (slideserve.com)

Upon PMA treatment, CD4 becomes localized in clathrin-coated pits, suggesting that the down-regulation is a clathrin-mediated endocytosis process ( 3 ). (jimmunol.org)

However, receptor-mediated endocytosis is also actively implicated in transducing signals from the cell periphery to the nucleus. (wikipedia.org)
Various macromolecules and viruses enter cells by means of receptor-mediated endocytosis. (biologists.org)
Receptor-mediated endocytosis of ricin in rat liver endothelial cells. (nih.gov)

Analysis of cell-nanosilicate interactions by monitoring changes in transcriptome profile uncovered key biophysical and biochemical cellular pathways triggered by nanosilicates. (pnas.org)
Depending on individual (patho-) physiological circumstances, cell-type and involved receptor-ligand system, cellular responses range from activation of pro-inflammatory and potentially pro-tumoural pathways such as nuclear factor κB (NFκB), to caspase-dependent and -independent mechanisms of cell death induction. (mdpi.com)
Our study is a very good example of how systematic studies of patients with rare genetic diseases can contribute to the discovery of new genes and signaling pathways that regulate the differentiation and functions of the cells that orchestrate the immune system," says Klein. (lmu.de)
BMP receptor endocytosis has not been extensively studied and the potential role of localization to different regions of the plasma membrane in determining the signaling pathways activated by PFCs and BISCs was not explored so far. (uni-wuerzburg.de)

Capillary endothelial cells from mammalian cardiac muscle caught in the act of fluid-phase micropinocytosis. (cellimagelibrary.org)
The expression of this receptor in lymphatic endothelial cells and overexpression in vascular tumors suggested its function in chemokine-driven recirculation of leukocytes and possible chemokine effects on the development and growth of vascular tumors. (avivasysbio.com)
Acts as a regulator of inflammatory leukocyte interactions with lymphatic endothelial cells (LECs) and is required for immature/mature dendritic cells discrimination by LECs. (avivasysbio.com)
Like many siglecs, CD22 interacts with endogenous ligands on B cells in cis , and on other cells, such as T cells and bone marrow vessel endothelial cells in trans . (functionalglycomics.org)

Through the interaction with the phospholipid fatty-acid chains, cholesterol increases membrane packing, which both alters membrane fluidity and maintains membrane integrity so that animal cells do not need to build cell walls (like plants and most bacteria). (wikipedia.org)
Interestingly, EEA.1 sensor did not follow activated Rab5-CAAX to the plasma membrane, suggesting that the interaction of EEA.1 with Rab5 plays a secondary role in EEA.1 targeting. (biologists.org)
It harbours binding sites for cytoplasmic protein ligands that can be targeted to membranes through the annexin-core-mediated phospholipid interaction. (nature.com)
this interaction is required for efficient alpha-tubulin acetylation, hence clathrin-coated pits are sites of microtubule acetylation. (expasy.org)
studies have suggested that fucose moieties as well as glycosphingolipids might be involved in the interaction of this subunit with the cell surface ( 13 , 18 - 20 ). (frontiersin.org)

Disruption of host cell cytoskeleton (actin filaments and microtubules) with cytochalasin D and nocodazole showed significant reduction in virus infectivity. (asm.org)
Clathrin-mediated endocytosis shuts down during mitosis in eukaryotic cells because all of the required actin is hoarded by the cytoskeleton. (the-scientist.com)
Using two different methods that released some of the actin from the cytoskeleton but did not decrease membrane tension, they demonstrated that it is possible to restart endocytosis. (the-scientist.com)
Therefore, we studied the reaction of Arabidopsis root hairs to the actin-depolymerizing drugs CD and LA. The results show that an increase in instability of the actin cytoskeleton can induce cell expansion over a larger area. (plantcell.org)
We further show that the orientation of polarized growth depends on an intact microtubule cytoskeleton, as is known for intercalary growing cells. (plantcell.org)
This defect correlated with a perturbation of the coupling between the clathrin coat and the actin cytoskeleton, which we confirmed in a cell-free assay of endocytosis. (elifesciences.org)
Chezzi, C. 2008-07-01 00:00:00 This study was aimed at investigating the possible involvement of the actin cytoskeleton in the modulation of host permissiveness to A/NWS/33 human influenza virus infection in two mammalian (MDCK and LLC-MK2) cell lines in vitro. (deepdyve.com)
Eukaryotes possess, among other distinguishing features, an intracellular dynamic membrane system through which there is a constant flow of membranes scaffolded by an internal cytoskeleton. (springer.com)
The properties of cortactin indicate that it may be important for microfilament-membrane interactions as well as transducing signals from the cell surface to the cytoskeleton. (sdbonline.org)

To test whether the Rab5(S34N) mutant affects endocytosis directly at the plasma membrane, CFP-Rab5 was fused to the plasma membrane targeting sequence of K-Ras containing a CAAX motif. (biologists.org)

These include effects on actin assemblies at cellular membranes, the organization of endosomal subcompartments, Ca 2+ -regulated exocytosis and midbody formation during cytokinesis. (nature.com)
Thus, despite the similarity of the two AP-1 complexes, AP-1A and AP-1B exhibit great specificity for endosomal transport versus cell polarity. (rupress.org)
Newly synthesized glycoproteins destined for transport to the plasma membrane or to the endosomal-lysosomal system travel together through the ER and the Golgi complex only to be sorted from each other upon exit from the TGN ( Mellman and Warren, 2000 ). (rupress.org)

These types of membrane microdomains are also recovered in exosomes ( 8 , 14 , 15 ). (aacrjournals.org)
These events are dependent upon toxin binding to cholesterol in the context of lipid rich membrane microdomains often referred to as lipid rafts. (frontiersin.org)
Cholesterol binding in the context of membrane microdomains was demonstrated utilizing both model membranes and live cells including both lymphocytes and macrophages ( 10 - 12 ). (frontiersin.org)

However, during the first seven hours after ingestion of cholesterol, as absorbed fats are being distributed around the body within extracellular water by the various lipoproteins (which transport all fats in the water outside cells), the concentrations increase. (wikipedia.org)
The LPAR1 spans the plasma membrane seven times in a barrel conformation with three extracellular and three intracellular loops. (atlasgeneticsoncology.org)
Recognizes human CD91, a type I membrane protein which is also known as the alpha 2 macroglobulin receptor (alpha 2 MR). Recognizes an epitope in the extracellular region of the 500kD alpha chain. (mybiosource.com)
The response to extracellular mitogenic stimuli requires the transduction of signals from the cell periphery to the interior of the cell. (sciencemag.org)
Extracellular mitogenic signals bind and activate receptor tyrosine kinases at the plasma membrane, thereby recruiting and subsequently activating phosphoinositide 3-kinases (PI3Ks). (sciencemag.org)
It is a homo-dimer consisting of two identical monomers joined by two disulfide bindings at cystein residues 89 and 92 in the extracellular domain just outside the cell membrane (Jing and Trowbridge 1987). (ifcc.org)

The RNP-M complex migrates to an area of the plasma membrane containing glycoprotein inserts, and the M-protein initiates coiling. (laportecounty.org)
The M-RNP complex binds with the glycoprotein, and the completed virus buds from the plasma membrane. (laportecounty.org)
LDL Receptor (low-density lipoprotein receptor or LDLR) is a key determinant of plasma cholesterol levels and as a ubiquitously expressed cell membrane glycoprotein, it binds LDL, the major cholesterol-carrying lipoprotein of plasma, and transports it into cells via endocytosis. (novusbio.com)
identification of a 420-kD cell surface glycoprotein specific for the activated conformation of α 2 -macroglobulin. (springer.com)
Tissue factor (TF) is a transmembrane cell surface glycoprotein of 45 to 50 kDa that forms a complex with activated factor VII, initiating blood coagulation and leading to the focal production of thrombin via the successive activation of factor IX, factor X, and prothrombin. (ahajournals.org)
A glycoprotein of Mr 80,000 was distributed throughout the total cell surface. (elsevier.com)

The clathrin lattice serves as a mechanical scaffold but is itself unable to bind directly to membrane components. (abcam.com)
Clathrin-associated adaptor protein (AP) complexes which can bind directly to both the clathrin lattice and to the lipid and protein components of membranes are considered to be the major clathrin adaptors contributing the CCV formation. (abcam.com)
Syndapins furthermore specifically bind to phosphatidylserine-containing membranes via their extended F-BAR domain. (jneurosci.org)
Here we demonstrate that syndapins bind to membranes directly via their eF-BAR domain and are capable of releasing N-WASP autoinhibition. (jneurosci.org)
complement receptor a membrane receptor that can bind activated complement components. (thefreedictionary.com)
At the core of this specificity may be the ability of LtxA to bind to integrin LFA1 , the transmembrane receptor of cells of the immune system that mediates cell attachment and signaling.Its binding induces the formation of pores on the membrane of monocytes, lymphocytes, neutrophils, and other myeloid and lymphoid cells. (asmblog.org)
Although cis ligands of tend to mask the CD22 binding site, CD22 is able to interact with trans ligands on contacting cells (B cells and T cells), and to bind to synthetic multivalent ligands that have sufficient avidity. (functionalglycomics.org)
Several investigators have demonstrated that the CdtC subunit of several Cdts, including the A. actinomycetemcomitans Cdt, bind to membrane cholesterol ( 10 - 17 ). (frontiersin.org)

We report super-resolution fluorescence imaging of live cells with high spatiotemporal resolution using stochastic optical reconstruction microscopy (STORM). (nih.gov)
The resulting chimeric CFP-Rab5-CAAX was located mainly in the plasma membrane and was capable of binding GTP as judged by FRET microscopy with the Rabaptin5-based sensor. (biologists.org)
HeLa cells expressing LCb-RFP and Dyn-2-EGFP were imaged by spinning disk microscopy. (nih.gov)
Using immunocryoelectron microscopy, WNV particles were seen within clathrin-coated pits after 2 min postinfection. (asm.org)
The membrane was mounted on a microscope slide and visualized using light microscopy, and the number of migrated cells (bottom of membrane) was counted. (nih.gov)
Live-cell lattice light-sheet microscopy (LLSM) is a technique for imaging cells rapidly. (news-medical.net)
In one study of human cancer cells, live cell light sheet microscopy was used to visualize membrane nanotubes. (news-medical.net)
Retrieved on December 03, 2020 from https://www.news-medical.net/life-sciences/Live-cell-Lattice-Light-sheet-Microscopy-(LLSM)-Applications.aspx. (news-medical.net)
Quantitative reflection contrast microscopy of living cells. (currentprotocols.com)
Refractive index measurement in viable cells using quantitative phase‐amplitude microscopy and confocal microscopy. (currentprotocols.com)
Confocal microscopy images showing expression of the phenotypic marker p75 NRT in olfactory ensheathing cells (OECs) infected by Streptococcus pneumoniae . (nih.gov)
flow cell cytometry and confocal fluorescence microscopy. (docme.ru)
Correlative three-dimensional super-resolution and block-face electron microscopy of whole vitreously frozen cells. (harvard.edu)
During the early stages of infection, no appreciable association between incoming NWS/33 virions and cortical actin was detectable in the permissive MDCK model by confocal microscopy, while extensive colocalization and a slower infection progression were observed in LLC-MK2 cells. (deepdyve.com)
By transmission electron microscopy, injected HAdV-D37 readily enters stromal cells in the C57Bl/6j mouse cornea and induces stromal inflammation, as was shown previously by light microscopy. (arvojournals.org)
Topographical descriptions of three major plasma membrane glycoproteins of murine 3T3 cells were obtained by immunoelectron microscopy with monoclonal antibodies. (elsevier.com)

Clathrin is linked to cargo and membranes by the clathrin adaptor complex ( Keen, 1987 ). (rupress.org)
A prolonged circulation half-life is generally regarded as a common prerequisite for either process, and NPs have been demonstrated to alter the pharmacokinetics (PK) of the cargo and enhance its circulation half-life, thereby promoting delivery specifically to the tumor and reducing collateral damage to healthy cells (Chow et al. (springer.com)
Core domains are responsible for the cargo protein binding and membrane localization. (bioscirep.org)

EGFRs stimulated with TGF-alpha recycled back to the plasma membrane, where they could be reactivated with ligand. (nih.gov)
This study reveals that EGFR-mediated cell migration is limited by ligand-stimulated downregulation of the EGFR. (nih.gov)
Data are plotted as the average fold change in the number of migrated cells (±SEM) for each ligand concentration ( n = 4). (nih.gov)
Once internalized, the ligand dissociates from the receptor, and is targeted to degradation while the receptor is recycled back to the cell membrane. (avivasysbio.com)
While both recognize the sequence Siaα-2-6Galβ-1-4GlcNAc expressed abundantly on B cells, murine CD22 prefers Neu5Gc (not found in humans) over Neu5Ac, while human CD22 exhibits highest affinity for sulfated sialoside, Neu5Acα-2-6Galβ-1-4[6S]GlcNAc, demonstrating significant evolution of ligand specificity with conservation of function. (functionalglycomics.org)
This section documents what is currently known about CD22, its carbohydrate ligand(s), and how they interact to mediate cell communication. (functionalglycomics.org)
Despite these differences, activation of B cells in both species results in down regulation of the highest affinity ligand. (functionalglycomics.org)
In murine B cells, activation causes de novo synthesis of sialosides with NeuAc instead of NeuGc through down regulation of CMP-sialic acid hydroxylase [7] , while in human B cells, differentiation of B cells in germinal centers coincides with loss of the sulfate from the high affinity sulfated ligand (3) [2] . (functionalglycomics.org)

These tyrosine motifs are involved in regulation of BCR signaling and also mediate its constitutive clathrin mediated endocytosis, an activity believed to be tied to its regulation of cell signaling. (functionalglycomics.org)

treatment of cells with Retro-2 leads to a decrease in CdtB-Golgi association. (frontiersin.org)

The CDT heterotrimeric holotoxin, consisting of the CdtA, CdtB and CdtC protein subunits, binds to a cell membrane receptor located within lipid rafts. (asmblog.org)
Recently, cholesterol has also been implicated in cell signalling processes, where it has been suggested that it forms lipid rafts in the plasma membrane . (wikidoc.org)

Specialised regions of the cell membrane composed of pits coated with a bristle covering made of the protein clathrin. (biology-online.org)
This causes the protein clathrin to assemble into a lattice at the cytosolic side of the plasma membrane and deform the membrane into a pit. (elifesciences.org)

The topology of the plasma membrane of eukaryotic cells is dictated by underlying actin cytoskeletal structures. (jneurosci.org)
The transition from interphase to mitosis in eukaryotic cells is accompanied by dramatic inhibition of endocytosis as well as profound changes in cellular architecture. (rupress.org)
AP complexes play important roles in maintaining the normal physiological function of eukaryotic cells. (bioscirep.org)
To establish an infection, Salmonella has to interact with eukaryotic cells. (frontiersin.org)

Interestingly, acute phosphatidylinositol 4,5-bisphosphate [PtdIns(4,5) P 2 ] depletion in cells does not interfere with plasma membrane localization of F-BAR(2), which is compatible with our result showing that F-BAR(2) binds to a broad range of negatively-charged phospholipids present at the plasma membrane, including phosphatidylserine (PtdSer). (biologists.org)
Immunostaining with specific monoclonal antibodies reveals a striking change of subcellular localization of p80/85 in src-transformed cells. (sdbonline.org)

Coordination of membrane deformation and cytoskeletal dynamics lies at the heart of many biological processes critical for cell polarity, motility and morphogenesis. (biologists.org)
Plasma membrane tethers formed by latex beads pull back on the beads with a force that was related to the in-plane bilayer tension and membrane- cytoskeletal adhesion. (rupress.org)
In addition to its role in signaling, PIP 2 also regulates cytoskeletal dynamics as well as numerous steps in membrane traffic ( 14 , 50 ). (physiology.org)

These data suggest that clathrin-dependent retrieval of SV membranes may at least in part depend on phosphoinositide metabolism. (rupress.org)
Although previously typically considered an event associated with the plasma membrane, it is now appreciated that the formation and metabolism of PtdIns(3,4,5)P 3 occur on multiple membranes with distinct kinetics. (sciencemag.org)

The AP-2 alpha subunit binds polyphosphoinositide-containing lipids, positioning AP-2 on the membrane. (genecards.org)
The LPAR1 binds LPA and initiates G protein-dependent signal transduction cascades throughout the cell that result in a number of functional outcomes, depending on the specific cell or tissue type. (atlasgeneticsoncology.org)
Although CD22 recognizes ligands on the same cell in cis , it also binds to ligands in trans if expressed on adjacent contacting cells. (functionalglycomics.org)

Beta adaptin is a subunit of the plasma membrane CC adaptor (By similarity). (univ-lyon1.fr)
It is rapidly taken up by endocytosis of the active CdtB protein subunit in a clathrin-coated pit. (asmblog.org)

2012). Introduction of hyperosmolar medium (lowering membrane tension) caused the total number of dynamins to increase (Figure 7, A and B), suggesting that a flaccid membrane needs more dynamin to rupture than does a tense one. (nih.gov)

RL Cell 96:507-515(1999). (genome.jp)

Once the complex has been endocytosed, iron is released to the cytosol for further transport inside the cell, for example to the mitochondria. (ifcc.org)

In the present study, we investigated whether an increase in instability (i.e., turnover) in the subapical fine F-actin in root hairs can trigger the exocytosis process by which plant cells grow. (plantcell.org)
Such activities probably regulate membrane-related processes like membrane-domain organization and membrane transport in endocytosis and exocytosis. (nature.com)
Localized topological changes of the plasma membrane upon exocytosis visualized by polarized TIRFM. (currentprotocols.com)

Figure 3: The regulation of membrane-actin interactions by annexin A2. (nature.com)
Swairjo, M. A. & Seaton, B. A. Annexin structure and membrane interactions: a molecular perspective. (nature.com)
The Laboratory of Cell and Tissue Morphodynamics, led by Dr. Clare Waterman, has made pioneering discoveries into the complex and dynamic mechanical interactions between organelle systems within cells that are required for directed movement. (nih.gov)
However, little information exists on exosome-endothelial cell (EC) interactions or the proangiogenic role of tetraspanins, which are a constitutive component of exosomes. (aacrjournals.org)
This communication sought to further investigate nanoparticle/cell interactions, ensuing toxicity and cellular responses within biological systems. (cdc.gov)
Here, we investigate the interactions of 2D nanosilicates, a layered clay, with human mesenchymal stem cells (hMSCs) at the whole-transcriptome level by high-throughput sequencing (RNA-seq). (pnas.org)
This approach in understanding nanomaterial-cell interactions illustrates how change in transcriptomic profile can predict downstream effects following nanomaterial treatment. (pnas.org)
1993). In the cell, SNAREs contribute to the specificity of such interactions (Bethani et al. (docme.ru)

We[1, 2] have suggested that SWNTs traverse the cellular membrane through endocytosis, whereas Pantarotto et al. (docme.ru)

We have recently shown that Slit-Robo GTPase-activating protein 2 (srGAP2) regulates neuronal morphogenesis through the ability of its F-BAR domain to regulate membrane deformation and induce filopodia formation. (biologists.org)
Nef down-regulates CD4 by linking CD4 to clathrin-coated pits. (jimmunol.org)
it regulates membrane fluidity over a wide range of temperatures . (wikidoc.org)
PIP 2 dynamics are known to modulate numerous steps in membrane trafficking, and it has been proposed that OCRL1 activity regulates the biogenesis or trafficking of the multiligand receptor megalin. (physiology.org)

These imaging capabilities open a new window for characterizing cellular structures in living cells at the ultrastructural level. (nih.gov)
BAR domains are membrane-binding modules, consisting of a series of three to five α-helices, that have a large dimerization interface to create banana-shaped quaternary structures. (biologists.org)
Royle and colleagues first observed that in HeLa cells, cortactin, a protein that activates actin polymerization, was present in clathrin structures during interphase but was greatly reduced during mitosis. (the-scientist.com)
These structures provide a means of communication between cells using soluble messengers such as in endocrine, paracrine, or exosome signaling. (news-medical.net)
Our data suggest a mechanism for the nanoscale control of CCP growth and stability that may similarly apply to other metastable structures in cells. (sciencemag.org)
Return to Template:Structures of the cell membrane . (wikidoc.org)
Cortactin, present in several different cell types, is enriched in cortical structures such as membrane ruffles and lamellipodia. (sdbonline.org)
The clathrin structures that formed in these manipulated cells recruited integrin β1 normally. (fredhutch.org)

This gene codes for a key protein called FCHO1, which is found at the plasma membrane," Klein explains. (lmu.de)

Additionally, exosomes contain selectively enriched mRNA and miRNA that regulate gene expression in target cells ( 16 ). (aacrjournals.org)
SWI/SNF complexes have been shown to regulate gene activation, cell growth, the cell cycle and differentiation (1). (cellsignal.com)
[1] [2] 9-O-acetylation of sialic acid abrogates binding of CD22, which is thought to regulate the binding of cis ligands on B cells. (functionalglycomics.org)

This core domain enables Ca 2+ -bound annexins to peripherally dock onto membranes that contain negatively charged phospholipids. (nature.com)

Anatomy48

Organisms9

Diseases1

Chemicals and Drugs100

Analytical, Diagnostic and Therapeutic Techniques and Equipment23

Phenomena and Processes44

Disciplines and Occupations3

Technology, Industry, Agriculture7

Information Science3

Health Care1

Enhancement of endocytosis due to aminophospholipid transport across the plasma membrane of living cells. (1/613)

Inhibition of clathrin-coated pit assembly by an Eps15 mutant. (2/613)

Direct demonstration of the endocytic function of caveolae by a cell-free assay. (3/613)

Characterization of the internalization pathways for the cystic fibrosis transmembrane conductance regulator. (4/613)

Cutting edge: receptor-mediated endocytosis of heat shock proteins by professional antigen-presenting cells. (5/613)

Bradykinin-induced internalization of the human B2 receptor requires phosphorylation of three serine and two threonine residues at its carboxyl tail. (6/613)

Inhibition of the receptor-binding function of clathrin adaptor protein AP-2 by dominant-negative mutant mu2 subunit and its effects on endocytosis. (7/613)

Functional properties of leptin receptor isoforms: internalization and degradation of leptin and ligand-induced receptor downregulation. (8/613)

Gastric Mucosa

Coated Pits, Cell-Membrane

Cell Membrane

Clathrin

Endocytosis

Membranes

Membrane Lipids

Intracellular Membranes

Membrane Fluidity

Membrane Potentials

Endosomes

Microscopy, Electron

Erythrocyte Membrane

Cell Membrane Permeability

Membranes, Artificial

Adaptor Protein Complex alpha Subunits

Clathrin-Coated Vesicles

Adaptor Protein Complex 2

Cell Line

Dynamins

Basement Membrane

Transferrin

Microscopy, Immunoelectron

Freeze Fracturing

Membrane Glycoproteins

Pinocytosis

Receptors, Cell Surface

Cells, Cultured

Protein Binding

Molecular Sequence Data

Protein Transport

Filipin

Models, Biological

Microscopy, Fluorescence

Microvilli

Amino Acid Sequence

Freeze Etching

Kinetics

Lipid Bilayers

Receptors, Transferrin

Diffusion

Membrane Transport Proteins

Fluorescent Antibody Technique

Heymann Nephritis Antigenic Complex

Organoids

Cytoplasm

Receptors, LDL

Temperature

Recombinant Fusion Proteins

Lysosomes

Mutation

Protein Structure, Tertiary

Potassium

Membrane Proteins

Golgi Apparatus

Ricin

Horseradish Peroxidase

Asialoglycoprotein Receptor

Transfection

Liposomes

Calcium

Cricetinae

Erythrocytes

Adaptor Protein Complex beta Subunits

Mitochondrial Membranes

Annexin A6

Coated Vesicles

Binding Sites

HeLa Cells

Molecular Weight

Synaptic Membranes

Hydrogen-Ion Concentration

Cytosol

Auxilins

Carrier Proteins

GTP Phosphohydrolases

Fibroblasts

Cell Fractionation

Biological Transport

CHO Cells