Voltage-dependent cell membrane glycoproteins selectively permeable to calcium ions. They are categorized as L-, T-, N-, P-, Q-, and R-types based on the activation and inactivation kinetics, ion specificity, and sensitivity to drugs and toxins. The L- and T-types are present throughout the cardiovascular and central nervous systems and the N-, P-, Q-, & R-types are located in neuronal tissue.
A species of gram-positive, coccoid bacteria isolated from skin lesions, blood, inflammatory exudates, and the upper respiratory tract of humans. It is a group A hemolytic Streptococcus that can cause SCARLET FEVER and RHEUMATIC FEVER.
A class of drugs that act by selective inhibition of calcium influx through cellular membranes.
Long-lasting voltage-gated CALCIUM CHANNELS found in both excitable and nonexcitable tissue. They are responsible for normal myocardial and vascular smooth muscle contractility. Five subunits (alpha-1, alpha-2, beta, gamma, and delta) make up the L-type channel. The alpha-1 subunit is the binding site for calcium-based antagonists. Dihydropyridine-based calcium antagonists are used as markers for these binding sites.
Infections with bacteria of the genus STREPTOCOCCUS.
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.
CALCIUM CHANNELS that are concentrated in neural tissue. Omega toxins inhibit the actions of these channels by altering their voltage dependence.
A heterogenous group of transient or low voltage activated type CALCIUM CHANNELS. They are found in cardiac myocyte membranes, the sinoatrial node, Purkinje cells of the heart and the central nervous system.
Signal transduction mechanisms whereby calcium mobilization (from outside the cell or from intracellular storage pools) to the cytoplasm is triggered by external stimuli. Calcium signals are often seen to propagate as waves, oscillations, spikes, sparks, or puffs. The calcium acts as an intracellular messenger by activating calcium-responsive proteins.
Agents that increase calcium influx into calcium channels of excitable tissues. This causes vasoconstriction in VASCULAR SMOOTH MUSCLE and/or CARDIAC MUSCLE cells as well as stimulation of insulin release from pancreatic islets. Therefore, tissue-selective calcium agonists have the potential to combat cardiac failure and endocrinological disorders. They have been used primarily in experimental studies in cell and tissue culture.
The opening and closing of ion channels due to a stimulus. The stimulus can be a change in membrane potential (voltage-gated), drugs or chemical transmitters (ligand-gated), or a mechanical deformation. Gating is thought to involve conformational changes of the ion channel which alters selective permeability.
Potassium channels where the flow of K+ ions into the cell is greater than the outward flow.
CALCIUM CHANNELS located within the PURKINJE CELLS of the cerebellum. They are involved in stimulation-secretion coupling of neurons.
CALCIUM CHANNELS located in the neurons of the brain.
Pyridine moieties which are partially saturated by the addition of two hydrogen atoms in any position.
CALCIUM CHANNELS located in the neurons of the brain. They are inhibited by the marine snail toxin, omega conotoxin MVIIC.
A potent vasodilator agent with calcium antagonistic action. It is a useful anti-anginal agent that also lowers blood pressure.
A class of drugs that act by inhibition of potassium efflux through cell membranes. Blockade of potassium channels prolongs the duration of ACTION POTENTIALS. They are used as ANTI-ARRHYTHMIA AGENTS and VASODILATOR AGENTS.
Cell membrane glycoproteins that form channels to selectively pass chloride ions. Nonselective blockers include FENAMATES; ETHACRYNIC ACID; and TAMOXIFEN.
A neurotoxic peptide, which is a cleavage product (VIa) of the omega-Conotoxin precursor protein contained in venom from the marine snail, CONUS geographus. It is an antagonist of CALCIUM CHANNELS, N-TYPE.
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.
Calcium compounds used as food supplements or in food to supply the body with calcium. Dietary calcium is needed during growth for bone development and for maintenance of skeletal integrity later in life to prevent osteoporosis.
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).
A family of structurally related neurotoxic peptides from mollusk venom that inhibit voltage-activated entry of calcium into the presynaptic membrane. They selectively inhibit N-, P-, and Q-type calcium channels.
Potassium channel whose permeability to ions is extremely sensitive to the transmembrane potential difference. The opening of these channels is induced by the membrane depolarization of the ACTION POTENTIAL.
A benzothiazepine derivative with vasodilating action due to its antagonism of the actions of CALCIUM ion on membrane functions.
Heteromultimers of Kir6 channels (the pore portion) and sulfonylurea receptor (the regulatory portion) which affect function of the HEART; PANCREATIC BETA CELLS; and KIDNEY COLLECTING DUCTS. KATP channel blockers include GLIBENCLAMIDE and mitiglinide whereas openers include CROMAKALIM and minoxidil sulfate.
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 calcium channel blocker that is a class IV anti-arrhythmia agent.
A potent antagonist of CALCIUM CHANNELS that is highly selective for VASCULAR SMOOTH MUSCLE. It is effective in the treatment of chronic stable angina pectoris, hypertension, and congestive cardiac failure.
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.
Potassium channels whose activation is dependent on intracellular calcium concentrations.
A calcium channel blocker with marked vasodilator action. It is an effective antihypertensive agent and differs from other calcium channel blockers in that it does not reduce glomerular filtration rate and is mildly natriuretic, rather than sodium retentive.
A benzimidazoyl-substituted tetraline that selectively binds and inhibits CALCIUM CHANNELS, T-TYPE.
The ability of a substrate to allow the passage of ELECTRONS.
A class of drugs that act by inhibition of sodium influx through cell membranes. Blockade of sodium channels slows the rate and amplitude of initial rapid depolarization, reduces cell excitability, and reduces conduction velocity.
An element of the alkaline earth group of metals. It has an atomic symbol Ba, atomic number 56, and atomic weight 138. All of its acid-soluble salts are poisonous.
A calcium channel blockader with preferential cerebrovascular activity. It has marked cerebrovascular dilating effects and lowers blood pressure.
A neuropeptide toxin from the venom of the funnel web spider, Agelenopsis aperta. It inhibits CALCIUM CHANNELS, P-TYPE by altering the voltage-dependent gating so that very large depolarizations are needed for channel opening. It also inhibits CALCIUM CHANNELS, Q-TYPE.
A subgroup of TRP cation channels that contain 3-4 ANKYRIN REPEAT DOMAINS and a conserved C-terminal domain. Members are highly expressed in the CENTRAL NERVOUS SYSTEM. Selectivity for calcium over sodium ranges from 0.5 to 10.
Voltage-gated potassium channels whose primary subunits contain six transmembrane segments and form tetramers to create a pore with a voltage sensor. They are related to their founding member, shaker protein, Drosophila.
The rate dynamics in chemical or physical systems.
The basic cellular units of nervous tissue. Each neuron consists of a body, an axon, and dendrites. Their purpose is to receive, conduct, and transmit impulses in the NERVOUS SYSTEM.
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.
A major class of calcium activated potassium channels whose members are voltage-dependent. MaxiK channels are activated by either membrane depolarization or an increase in intracellular Ca(2+). They are key regulators of calcium and electrical signaling in a variety of tissues.
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.
Carbonic acid calcium salt (CaCO3). An odorless, tasteless powder or crystal that occurs in nature. It is used therapeutically as a phosphate buffer in hemodialysis patients and as a calcium supplement.
A subgroup of cyclic nucleotide-regulated ION CHANNELS within the superfamily of pore-loop cation channels. They are expressed in OLFACTORY NERVE cilia and in PHOTORECEPTOR CELLS and some PLANTS.
Female germ cells derived from OOGONIA and termed OOCYTES when they enter MEIOSIS. The primary oocytes begin meiosis but are arrested at the diplotene state until OVULATION at PUBERTY to give rise to haploid secondary oocytes or ova (OVUM).
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.
A salt used to replenish calcium levels, as an acid-producing diuretic, and as an antidote for magnesium poisoning.
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 subgroup of TRP cation channels named after vanilloid receptor. They are very sensitive to TEMPERATURE and hot spicy food and CAPSAICIN. They have the TRP domain and ANKYRIN repeats. Selectivity for CALCIUM over SODIUM ranges from 3 to 100 fold.
The relationship between the dose of an administered drug and the response of the organism to the drug.
A potent calcium channel blockader with marked vasodilator action. It has antihypertensive properties and is effective in the treatment of angina and coronary spasms without showing cardiodepressant effects. It has also been used in the treatment of asthma and enhances the action of specific antineoplastic agents.
The commonest and widest ranging species of the clawed "frog" (Xenopus) in Africa. This species is used extensively in research. There is now a significant population in California derived from escaped laboratory animals.
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 tetrameric calcium release channel in the SARCOPLASMIC RETICULUM membrane of SMOOTH MUSCLE CELLS, acting oppositely to SARCOPLASMIC RETICULUM CALCIUM-TRANSPORTING ATPASES. It is important in skeletal and cardiac excitation-contraction coupling and studied by using RYANODINE. Abnormalities are implicated in CARDIAC ARRHYTHMIAS and MUSCULAR DISEASES.
A subgroup of TRP cation channels named after melastatin protein. They have the TRP domain but lack ANKYRIN repeats. Enzyme domains in the C-terminus leads to them being called chanzymes.
A family of proton-gated sodium channels that are primarily expressed in neuronal tissue. They are AMILORIDE-sensitive and are implicated in the signaling of a variety of neurological stimuli, most notably that of pain in response to acidic conditions.
Venoms of arthropods of the order Araneida of the ARACHNIDA. The venoms usually contain several protein fractions, including ENZYMES, hemolytic, neurolytic, and other TOXINS, BIOLOGICAL.
Calcium salts of phosphoric acid. These compounds are frequently used as calcium supplements.
Established cell cultures that have the potential to propagate indefinitely.
Sodium channels found on salt-reabsorbing EPITHELIAL CELLS that line the distal NEPHRON; the distal COLON; SALIVARY DUCTS; SWEAT GLANDS; and the LUNG. They are AMILORIDE-sensitive and play a critical role in the control of sodium balance, BLOOD VOLUME, and BLOOD PRESSURE.
A delayed rectifier subtype of shaker potassium channels that is the predominant VOLTAGE-GATED POTASSIUM CHANNEL of T-LYMPHOCYTES.
A family of voltage-gated potassium channels that are characterized by long N-terminal and C-terminal intracellular tails. They are named from the Drosophila protein whose mutation causes abnormal leg shaking under ether anesthesia. Their activation kinetics are dependent on extracellular MAGNESIUM and PROTON concentration.
Stable calcium atoms that have the same atomic number as the element calcium, but differ in atomic weight. Ca-42-44, 46, and 48 are stable calcium isotopes.
A delayed rectifier subtype of shaker potassium channels that is selectively inhibited by a variety of SCORPION VENOMS.
A delayed rectifier subtype of shaker potassium channels that is commonly mutated in human episodic ATAXIA and MYOKYMIA.
Unstable isotopes of calcium that decay or disintegrate emitting radiation. Ca atoms with atomic weights 39, 41, 45, 47, 49, and 50 are radioactive calcium isotopes.
Single chains of amino acids that are the units of multimeric PROTEINS. Multimeric proteins can be composed of identical or non-identical subunits. One or more monomeric subunits may compose a protomer which itself is a subunit structure of a larger assembly.
A long-acting dihydropyridine calcium channel blocker. It is effective in the treatment of ANGINA PECTORIS and HYPERTENSION.
A delayed rectifier subtype of shaker potassium channels that conducts a delayed rectifier current. It contributes to ACTION POTENTIAL repolarization of MYOCYTES in HEART ATRIA.
A class of polyamine and peptide toxins which are isolated from the venom of spiders such as Agelenopsis aperta.
An aquatic genus of the family, Pipidae, occurring in Africa and distinguished by having black horny claws on three inner hind toes.
The muscle tissue of the HEART. It is composed of striated, involuntary muscle cells (MYOCYTES, CARDIAC) connected to form the contractile pump to generate blood flow.
A major class of calcium-activated potassium channels that are found primarily in excitable CELLS. They play important roles in the transmission of ACTION POTENTIALS and generate a long-lasting hyperpolarization known as the slow afterhyperpolarization.
A member of the alkali group of metals. It has the atomic symbol Na, atomic number 11, and atomic weight 23.
Abrupt changes in the membrane potential that sweep along the CELL MEMBRANE of excitable cells in response to excitation stimuli.
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 movement of ions across energy-transducing cell membranes. Transport can be active, passive or facilitated. Ions may travel by themselves (uniport), or as a group of two or more ions in the same (symport) or opposite (antiport) directions.
Elements of limited time intervals, contributing to particular results or situations.
An adenine nucleotide containing three phosphate groups esterified to the sugar moiety. In addition to its crucial roles in metabolism adenosine triphosphate is a neurotransmitter.
Venoms from mollusks, including CONUS and OCTOPUS species. The venoms contain proteins, enzymes, choline derivatives, slow-reacting substances, and several characterized polypeptide toxins that affect the nervous system. Mollusk venoms include cephalotoxin, venerupin, maculotoxin, surugatoxin, conotoxins, and murexine.
A broad group of eukaryotic six-transmembrane cation channels that are classified by sequence homology because their functional involvement with SENSATION is varied. They have only weak voltage sensitivity and ion selectivity. They are named after a DROSOPHILA mutant that displayed transient receptor potentials in response to light. A 25-amino-acid motif containing a TRP box (EWKFAR) just C-terminal to S6 is found in TRPC, TRPV and TRPM subgroups. ANKYRIN repeats are found in TRPC, TRPV & TRPN subgroups. Some are functionally associated with TYROSINE KINASE or TYPE C PHOSPHOLIPASES.
A family of delayed rectifier voltage-gated potassium channels that share homology with their founding member, KCNQ1 PROTEIN. KCNQ potassium channels have been implicated in a variety of diseases including LONG QT SYNDROME; DEAFNESS; and EPILEPSY.
A subfamily of shaker potassium channels that shares homology with its founding member, Shab protein, Drosophila. They regulate delayed rectifier currents in the NERVOUS SYSTEM of DROSOPHILA and in the SKELETAL MUSCLE and HEART of VERTEBRATES.
A strain of albino rat developed at the Wistar Institute that has spread widely at other institutions. This has markedly diluted the original strain.
A voltage-gated potassium channel that is expressed primarily in the HEART.
A chelating agent relatively more specific for calcium and less toxic than EDETIC ACID.
Use of electric potential or currents to elicit biological responses.
The lipid- and protein-containing, selectively permeable membrane that surrounds the cytoplasm in prokaryotic and eukaryotic cells.
A shaker subfamily that is prominently expressed in NEURONS and are necessary for high-frequency, repetitive firing of ACTION POTENTIALS.
A fast inactivating subtype of shaker potassium channels that contains two inactivation domains at its N terminus.
An aminoperhydroquinazoline poison found mainly in the liver and ovaries of fishes in the order TETRAODONTIFORMES, which are eaten. The toxin causes paresthesia and paralysis through interference with neuromuscular conduction.
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.
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.
The calcium salt of oxalic acid, occurring in the urine as crystals and in certain calculi.
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.
Chemicals that bind to and remove ions from solutions. Many chelating agents function through the formation of COORDINATION COMPLEXES with METALS.
Coronary vasodilator that is an analog of iproveratril (VERAPAMIL) with one more methoxy group on the benzene ring.
A family of inwardly-rectifying potassium channels that are activated by PERTUSSIS TOXIN sensitive G-PROTEIN-COUPLED RECEPTORS. GIRK potassium channels are primarily activated by the complex of GTP-BINDING PROTEIN BETA SUBUNITS and GTP-BINDING PROTEIN GAMMA SUBUNITS.
The calcium salt of gluconic acid. The compound has a variety of uses, including its use as a calcium replenisher in hypocalcemic states.
A shaker subfamily of potassium channels that participate in transient outward potassium currents by activating at subthreshold MEMBRANE POTENTIALS, inactivating rapidly, and recovering from inactivation quickly.
The distal terminations of axons which are specialized for the release of neurotransmitters. Also included are varicosities along the course of axons which have similar specializations and also release transmitters. Presynaptic terminals in both the central and peripheral nervous systems are included.
A metallic element that has the atomic symbol Mg, atomic number 12, and atomic weight 24.31. It is important for the activity of many enzymes, especially those involved in OXIDATIVE PHOSPHORYLATION.
A fluorescent calcium chelating agent which is used to study intracellular calcium in tissues.
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 sesquiterpene lactone found in roots of THAPSIA. It inhibits CA(2+)-TRANSPORTING ATPASE mediated uptake of CALCIUM into SARCOPLASMIC RETICULUM.
The hollow, muscular organ that maintains the circulation of the blood.
A very slow opening and closing voltage-gated potassium channel that is expressed in NEURONS and is commonly mutated in BENIGN FAMILIAL NEONATAL CONVULSIONS.
The parts of a macromolecule that directly participate in its specific combination with another molecule.
A subgroup of cyclic nucleotide-regulated ION CHANNELS of the superfamily of pore-loop cation channels that are opened by hyperpolarization rather than depolarization. The ion conducting pore passes SODIUM, CALCIUM, and POTASSIUM cations with a preference for potassium.
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.
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.
The nonstriated involuntary muscle tissue of blood vessels.
A potassium-selective ion channel blocker. (From J Gen Phys 1994;104(1):173-90)
A trace element with the atomic symbol Ni, atomic number 28, and atomic weight 58.69. It is a cofactor of the enzyme UREASE.
Substances used for their pharmacological actions on any aspect of neurotransmitter systems. Neurotransmitter agents include agonists, antagonists, degradation inhibitors, uptake inhibitors, depleters, precursors, and modulators of receptor function.
The study of PHYSICAL PHENOMENA and PHYSICAL PROCESSES as applied to living things.
An antidiabetic sulfonylurea derivative with actions similar to those of chlorpropamide.
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.
Lanthanum. The prototypical element in the rare earth family of metals. It has the atomic symbol La, atomic number 57, and atomic weight 138.91. Lanthanide ion is used in experimental biology as a calcium antagonist; lanthanum oxide improves the optical properties of glass.
An element with atomic symbol Cd, atomic number 48, and atomic weight 114. It is a metal and ingestion will lead to CADMIUM POISONING.
Venoms from animals of the order Scorpionida of the class Arachnida. They contain neuro- and hemotoxins, enzymes, and various other factors that may release acetylcholine and catecholamines from nerve endings. Of the several protein toxins that have been characterized, most are immunogenic.
Contractile tissue that produces movement in animals.
A dihydropyridine calcium channel antagonist that acts as a potent arterial vasodilator and antihypertensive agent. It is also effective in patients with cardiac failure and angina.
A voltage-gated sodium channel subtype that mediates the sodium ion PERMEABILITY of CARDIOMYOCYTES. Defects in the SCN5A gene, which codes for the alpha subunit of this sodium channel, are associated with a variety of CARDIAC DISEASES that result from loss of sodium channel function.
A curved elevation of GRAY MATTER extending the entire length of the floor of the TEMPORAL HORN of the LATERAL VENTRICLE (see also TEMPORAL LOBE). The hippocampus proper, subiculum, and DENTATE GYRUS constitute the hippocampal formation. Sometimes authors include the ENTORHINAL CORTEX in the hippocampal formation.
Models used experimentally or theoretically to study molecular shape, electronic properties, or interactions; includes analogous molecules, computer-generated graphics, and mechanical structures.
A major class of calcium-activated potassium channels that were originally discovered in ERYTHROCYTES. They are found primarily in non-excitable CELLS and set up electrical gradients for PASSIVE ION TRANSPORT.
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.
The communication from a NEURON to a target (neuron, muscle, or secretory cell) across a SYNAPSE. In chemical synaptic transmission, the presynaptic neuron releases a NEUROTRANSMITTER that diffuses across the synaptic cleft and binds to specific synaptic receptors, activating them. The activated receptors modulate specific ion channels and/or second-messenger systems in the postsynaptic cell. In electrical synaptic transmission, electrical signals are communicated as an ionic current flow across ELECTRICAL SYNAPSES.
A very slow opening and closing voltage-gated potassium channel that is expressed in NEURONS and is closely related to KCNQ2 POTASSIUM CHANNEL. It is commonly mutated in BENIGN FAMILIAL NEONATAL CONVULSIONS.
The pore-forming subunits of large-conductance calcium-activated potassium channels. They form tetramers in CELL MEMBRANES.
An atom or group of atoms that have a positive or negative electric charge due to a gain (negative charge) or loss (positive charge) of one or more electrons. Atoms with a positive charge are known as CATIONS; those with a negative charge are ANIONS.
Sensory ganglia located on the dorsal spinal roots within the vertebral column. The spinal ganglion cells are pseudounipolar. The single primary branch bifurcates sending a peripheral process to carry sensory information from the periphery and a central branch which relays that information to the spinal cord or brain.
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)
Positively charged atoms, radicals or groups of atoms which travel to the cathode or negative pole during electrolysis.
Intracellular receptors that bind to INOSITOL 1,4,5-TRISPHOSPHATE and play an important role in its intracellular signaling. Inositol 1,4,5-trisphosphate receptors are calcium channels that release CALCIUM in response to increased levels of inositol 1,4,5-trisphosphate in the CYTOPLASM.
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.
A process leading to shortening and/or development of tension in muscle tissue. Muscle contraction occurs by a sliding filament mechanism whereby actin filaments slide inward among the myosin filaments.
A methylpyrrole-carboxylate from RYANIA that disrupts the RYANODINE RECEPTOR CALCIUM RELEASE CHANNEL to modify CALCIUM release from SARCOPLASMIC RETICULUM resulting in alteration of MUSCLE CONTRACTION. It was previously used in INSECTICIDES. It is used experimentally in conjunction with THAPSIGARGIN and other inhibitors of CALCIUM ATPASE uptake of calcium into SARCOPLASMIC RETICULUM.
A group of slow opening and closing voltage-gated potassium channels. Because of their delayed activation kinetics they play an important role in controlling ACTION POTENTIAL duration.
A heat-stable, low-molecular-weight activator protein found mainly in the brain and heart. The binding of calcium ions to this protein allows this protein to bind to cyclic nucleotide phosphodiesterases and to adenyl cyclase with subsequent activation. Thereby this protein modulates cyclic AMP and cyclic GMP levels.
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 voltage-gated sodium channel subtype that mediates the sodium ion permeability of excitable membranes. Defects in the SCN2A gene which codes for the alpha subunit of this sodium channel are associated with benign familial infantile seizures type 3, and early infantile epileptic encephalopathy type 11.
A family of membrane proteins that selectively conduct SODIUM ions due to changes in the TRANSMEMBRANE POTENTIAL DIFFERENCE. They typically have a multimeric structure with a core alpha subunit that defines the sodium channel subtype and several beta subunits that modulate sodium channel activity.
Inorganic compounds derived from hydrochloric acid that contain the Cl- ion.
Striated muscle cells found in the heart. They are derived from cardiac myoblasts (MYOBLASTS, CARDIAC).
A quality of cell membranes which permits the passage of solvents and solutes into and out of cells.
A 37-amino acid residue peptide isolated from the scorpion Leiurus quinquestriatus hebraeus. It is a neurotoxin that inhibits calcium activated potassium channels.
Layers of lipid molecules which are two molecules thick. Bilayer systems are frequently studied as models of biological membranes.
The physical characteristics and processes of biological systems.
Proteins prepared by recombinant DNA technology.
The fluid inside CELLS.
Refers to animals in the period of time just after birth.
Intracellular fluid from the cytoplasm after removal of ORGANELLES and other insoluble cytoplasmic components.
An element of the alkaline earth family of metals. It has the atomic symbol Sr, atomic number 38, and atomic weight 87.62.
Flunarizine is a selective calcium entry blocker with calmodulin binding properties and histamine H1 blocking activity. It is effective in the prophylaxis of migraine, occlusive peripheral vascular disease, vertigo of central and peripheral origin, and as an adjuvant in the therapy of epilepsy.
An ionophorous, polyether antibiotic from Streptomyces chartreusensis. It binds and transports CALCIUM and other divalent cations across membranes and uncouples oxidative phosphorylation while inhibiting ATPase of rat liver mitochondria. The substance is used mostly as a biochemical tool to study the role of divalent cations in various biological systems.
A cell line generated from human embryonic kidney cells that were transformed with human adenovirus type 5.
Compounds or agents that combine with an enzyme in such a manner as to prevent the normal substrate-enzyme combination and the catalytic reaction.
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.-.
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).
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.
Inorganic compounds that contain calcium as an integral part of the molecule.
Different forms of a protein that may be produced from different GENES, or from the same gene by ALTERNATIVE SPLICING.
A non-essential amino acid naturally occurring in the L-form. Glutamic acid is the most common excitatory neurotransmitter in the CENTRAL NERVOUS SYSTEM.
One of the POTASSIUM CHANNEL BLOCKERS, with secondary effect on calcium currents, which is used mainly as a research tool and to characterize channel subtypes.
Body organ that filters blood for the secretion of URINE and that regulates ion concentrations.
An adenine nucleotide containing one phosphate group which is esterified to both the 3'- and 5'-positions of the sugar moiety. It is a second messenger and a key intracellular regulator, functioning as a mediator of activity for a number of hormones, including epinephrine, glucagon, and ACTH.
Specialized junctions at which a neuron communicates with a target cell. At classical synapses, a neuron's presynaptic terminal releases a chemical transmitter stored in synaptic vesicles which diffuses across a narrow synaptic cleft and activates receptors on the postsynaptic membrane of the target cell. The target may be a dendrite, cell body, or axon of another neuron, or a specialized region of a muscle or secretory cell. Neurons may also communicate via direct electrical coupling with ELECTRICAL SYNAPSES. Several other non-synaptic chemical or electric signal transmitting processes occur via extracellular mediated interactions.
Positively charged atoms, radicals or groups of atoms with a valence of plus 2, which travel to the cathode or negative pole during electrolysis.
A highly neurotoxic polypeptide from the venom of the honey bee (Apis mellifera). It consists of 18 amino acids with two disulfide bridges and causes hyperexcitability resulting in convulsions and respiratory paralysis.
An serine-threonine protein kinase that requires the presence of physiological concentrations of CALCIUM and membrane PHOSPHOLIPIDS. The additional presence of DIACYLGLYCEROLS markedly increases its sensitivity to both calcium and phospholipids. The sensitivity of the enzyme can also be increased by PHORBOL ESTERS and it is believed that protein kinase C is the receptor protein of tumor-promoting phorbol esters.
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.
A group of enzymes that are dependent on CYCLIC AMP and catalyze the phosphorylation of SERINE or THREONINE residues on proteins. Included under this category are two cyclic-AMP-dependent protein kinase subtypes, each of which is defined by its subunit composition.
Proteins to which calcium ions are bound. They can act as transport proteins, regulator proteins, or activator proteins. They typically contain EF HAND MOTIFS.
A white crystal or crystalline powder used in BUFFERS; FERTILIZERS; and EXPLOSIVES. It can be used to replenish ELECTROLYTES and restore WATER-ELECTROLYTE BALANCE in treating HYPOKALEMIA.
A methylxanthine naturally occurring in some beverages and also used as a pharmacological agent. Caffeine's most notable pharmacological effect is as a central nervous system stimulant, increasing alertness and producing agitation. It also relaxes SMOOTH MUSCLE, stimulates CARDIAC MUSCLE, stimulates DIURESIS, and appears to be useful in the treatment of some types of headache. Several cellular actions of caffeine have been observed, but it is not entirely clear how each contributes to its pharmacological profile. Among the most important are inhibition of cyclic nucleotide PHOSPHODIESTERASES, antagonism of ADENOSINE RECEPTORS, and modulation of intracellular calcium handling.
Proteins that bind specific drugs with high affinity and trigger intracellular changes influencing the behavior of cells. Drug receptors are generally thought to be receptors for some endogenous substance not otherwise specified.
The degree of similarity between sequences of amino acids. This information is useful for the analyzing genetic relatedness of proteins and species.
A dihydropyridine calcium antagonist with positive inotropic effects. It lowers blood pressure by reducing peripheral vascular resistance through a highly selective action on smooth muscle in arteriolar resistance vessels.
Drugs used in the treatment of acute or chronic vascular HYPERTENSION regardless of pharmacological mechanism. Among the antihypertensive agents are DIURETICS; (especially DIURETICS, THIAZIDE); ADRENERGIC BETA-ANTAGONISTS; ADRENERGIC ALPHA-ANTAGONISTS; ANGIOTENSIN-CONVERTING ENZYME INHIBITORS; CALCIUM CHANNEL BLOCKERS; GANGLIONIC BLOCKERS; and VASODILATOR AGENTS.
Genetically engineered MUTAGENESIS at a specific site in the DNA molecule that introduces a base substitution, or an insertion or deletion.
ATP-BINDING CASSETTE PROTEINS that are highly conserved and widely expressed in nature. They form an integral part of the ATP-sensitive potassium channel complex which has two intracellular nucleotide folds that bind to sulfonylureas and their analogs.
Unstriated and unstriped muscle, one of the muscles of the internal organs, blood vessels, hair follicles, etc. Contractile elements are elongated, usually spindle-shaped cells with centrally located nuclei. Smooth muscle fibers are bound together into sheets or bundles by reticular fibers and frequently elastic nets are also abundant. (From Stedman, 25th ed)
The part of brain that lies behind the BRAIN STEM in the posterior base of skull (CRANIAL FOSSA, POSTERIOR). It is also known as the "little brain" with convolutions similar to those of CEREBRAL CORTEX, inner white matter, and deep cerebellar nuclei. Its function is to coordinate voluntary movements, maintain balance, and learn motor skills.
A subfamily in the family MURIDAE, comprising the hamsters. Four of the more common genera are Cricetus, CRICETULUS; MESOCRICETUS; and PHODOPUS.
The excitable plasma membrane of a muscle cell. (Glick, Glossary of Biochemistry and Molecular Biology, 1990)
The part of CENTRAL NERVOUS SYSTEM that is contained within the skull (CRANIUM). Arising from the NEURAL TUBE, the embryonic brain is comprised of three major parts including PROSENCEPHALON (the forebrain); MESENCEPHALON (the midbrain); and RHOMBENCEPHALON (the hindbrain). The developed brain consists of CEREBRUM; CEREBELLUM; and other structures in the BRAIN STEM.
A voltage-gated sodium channel subtype that mediates the sodium ion PERMEABILITY of SKELETAL MYOCYTES. Defects in the SCN4A gene, which codes for the alpha subunit of this sodium channel, are associated with several MYOTONIC DISORDERS.
A family of voltage-gated eukaryotic porins that form aqueous channels. They play an essential role in mitochondrial CELL MEMBRANE PERMEABILITY, are often regulated by BCL-2 PROTO-ONCOGENE PROTEINS, and have been implicated in APOPTOSIS.
The processes whereby the internal environment of an organism tends to remain balanced and stable.
Interstitial space between cells, occupied by INTERSTITIAL FLUID as well as amorphous and fibrous substances. For organisms with a CELL WALL, the extracellular space includes everything outside of the CELL MEMBRANE including the PERIPLASM and the cell wall.
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 proline analog that acts as a stoichiometric replacement of proline. It causes the production of abnormal proteins with impaired biological activity.
Cellular release of material within membrane-limited vesicles by fusion of the vesicles with the CELL MEMBRANE.

Differential distribution of three members of a gene family encoding low voltage-activated (T-type) calcium channels. (1/576)

Low voltage-activated (T-type) calcium currents are observed in many central and peripheral neurons and display distinct physiological and functional properties. Using in situ hybridization, we have localized central and peripheral nervous system expression of three transcripts (alpha1G, alpha1H, and alpha1I) of the T-type calcium channel family (CaVT). Each mRNA demonstrated a unique distribution, and expression of the three genes was largely complementary. We found high levels of expression of these transcripts in regions associated with prominent T-type currents, including inferior olivary and thalamic relay neurons (which expressed alpha1G), sensory ganglia, pituitary, and dentate gyrus granule neurons (alpha1H), and thalamic reticular neurons (alpha1I and alpha1H). Other regions of high expression included the Purkinje cell layer of the cerebellum, the bed nucleus of the stria terminalis, the claustrum (alpha1G), the olfactory tubercles (alpha1H and alpha1I), and the subthalamic nucleus (alpha1I and alpha1G). Some neurons expressed high levels of all three genes, including hippocampal pyramidal neurons and olfactory granule cells. Many brain regions showed a predominance of labeling for alpha1G, including the amygdala, cerebral cortex, rostral hypothalamus, brainstem, and spinal cord. Exceptions included the basal ganglia, which showed more prominent labeling for alpha1H and alpha1I, and the olfactory bulb, the hippocampus, and the caudal hypothalamus, which showed more even levels of all three transcripts. Our results are consistent with the hypothesis that differential gene expression underlies pharmacological and physiological heterogeneity observed in neuronal T-type calcium currents, and they provide a molecular basis for the study of T-type channels in particular neurons.  (+info)

Cloning and expression of a novel member of the low voltage-activated T-type calcium channel family. (2/576)

Low voltage-activated Ca2+ channels play important roles in pacing neuronal firing and producing network oscillations, such as those that occur during sleep and epilepsy. Here we describe the cloning and expression of the third member of the T-type family, alpha1I or CavT.3, from rat brain. Northern analysis indicated that it is predominantly expressed in brain. Expression of the cloned channel in either Xenopus oocytes or stably transfected human embryonic kidney-293 cells revealed novel gating properties. We compared these electrophysiological properties to those of the cloned T-type channels alpha1G and alpha1H and to the high voltage-activated channels formed by alpha1Ebeta3. The alpha1I channels opened after small depolarizations of the membrane similar to alpha1G and alpha1H but at more depolarized potentials. The kinetics of activation and inactivation were dramatically slower, which allows the channel to act as a Ca2+ injector. In oocytes, the kinetics were even slower, suggesting that components of the expression system modulate its gating properties. Steady-state inactivation occurred at higher potentials than any of the other T channels, endowing the channel with a substantial window current. The alpha1I channel could still be classified as T-type by virtue of its criss-crossing kinetics, its slow deactivation (tail current), and its small (11 pS) conductance in 110 mM Ba2+ solutions. Based on its brain distribution and novel gating properties, we suggest that alpha1I plays important roles in determining the electroresponsiveness of neurons, and hence, may be a novel drug target.  (+info)

L- and T-type voltage-gated Ca2+ currents in adrenal medulla endothelial cells. (3/576)

We investigated voltage-dependent Ca2+ channels of bovine adrenal medulla endothelial cells with the whole cell version of the patch-clamp technique. Depolarization elicited an inward current that was carried by Ca2+ and was composed of a transient (T) current, present in all the cells tested, and a sustained (L) current, present in 65% of them. We separated these currents and measured their individual kinetic and gating properties. The activation threshold for T current was approximately -50 mV, and its maximum amplitude was -49.8 +/- 4.8 pA (means +/- SE, n = 19) at 0 mV. The time constant was 10.2 +/- 1.5 ms (n = 4) for activation and 18.4 +/- 2.8 ms (n = 4) for inactivation. The L current activated at -40 mV, and it reached a plateau at -20.1 +/- 2.3 pA (n = 6). Its activation time course was a single exponential with an activation time contant of 26.8 +/- 2.3 ms (n = 4). Current-voltage curves, kinetics, gating, response to BAY K 8644, nifedipine, amiloride, and different selectivity for Ba2+ and Ca2+ indicated that the underlying channels for the observed currents are only of the T- and L-types that resemble those of the endocrine secretory cells.  (+info)

A role for T-type Ca2+ channels in the synergistic control of aldosterone production by ANG II and K+. (4/576)

Independently, plasma K+ and ANG II stimulate aldosterone secretion from adrenal glomerulosa (AG) cells, but together they synergistically control production. We studied mechanisms to mediate this synergy using bovine AG cells studied under physiological conditions (in 1.25 mM Ca2+ at 37 degrees C). Increasing K+ from 2 to 5 mM caused a potentiation of ANG II-induced aldosterone secretion and a substantial membrane depolarization ( approximately 21 mV). ANG II inhibited a K+-selective conductance in both 2 and 5 mM K+ but caused only a slight depolarization because, under both conditions, membrane potential was close to the reversal potential of the ANG II-induced current. ANG II activated calcium/calmodulin-dependent protein kinase II (CaMKII) equivalently in 2 and 5 mM K+. However, CaMKII activation caused a hyperpolarizing shift in the activation of T-type Ca2+ channels, such that substantially more current was elicited at membrane potentials established by 5 mM K+. We propose that synergy in aldosterone secretion results from K+-induced depolarization and ANG II-induced modulation of T-type channel activation, such that together they promote enhanced steady-state Ca2+ flux.  (+info)

Morphological transformation induced by activation of the mitogen-activated protein kinase pathway requires suppression of the T-type Ca2+ channel. (5/576)

Transformation of fibroblasts by various oncogenes, including ras, mos, and src accompanies with characteristic morphological changes from flat to round (or spindle) shapes. Such morphological change is believed to play an important role in establishing malignant characteristics of cancer cells. Activation of the mitogen-activated protein kinase (MAPK) pathway is a converging downstream event of transforming activities of many oncogene products commonly found in human cancers. Intracellular calcium is known to regulate cellular morphology. In fibroblasts, Ca2+ influx is primarily controlled by two types of Ca2+ channels (T- and L-types). Here, we report that the T-type current was specifically inhibited in cells expressing oncogenically activated Ras as well as gain-of-function mutant MEK (MAPK/extracellular signal-regulated kinase (ERK) kinase, a direct activator of MAPK), whereas treatment of ras-transformed cells with a MEK-specific inhibitor restored T-type Ca2+ channel activity. Using a T-type Ca2+ channel antagonist, we further found that suppression of the T-type Ca2+ channel by the activated MAPK pathway is a prerequisite event for the induction and/or maintenance of transformation-associated morphological changes.  (+info)

All thalamocortical neurones possess a T-type Ca2+ 'window' current that enables the expression of bistability-mediated activities. (6/576)

1. The existence of a non-negligible steady-state ('window') component of the low threshold, T-type Ca2+current (IT) and an appropriately large ratio of IT to ILeak conductance (i.e. gT/gLeak) have been shown to underlie a novel form of intrinsic bistability that is present in about 15 % of thalamocortical (TC) neurones. 2. In the present experiments, the dynamic clamp technique was used to introduce into mammalian TC neurones in vitro either an artificial, i.e. computer-generated, IT in order to enhance endogenous IT, or an artificial inward ILeak to decrease endogenous ILeak. Using this method, we were able to investigate directly whether the majority of TC neurones appear non-bistable because their intrinsic ionic membrane properties are essentially different (i.e. presence of a negligible IT 'window' component), or simply because they possess a gT or gLeak conductance that is insufficiently large or small, respectively. 3. The validity of the dynamic clamp arrangement and the accuracy of artificial IT were confirmed by (i) recreating the low threshold calcium potential (LTCP) with artificial IT following its block by Ni2+ (0.5-1 mM), and (ii) blocking endogenous LTCPs with an artificial outward IT. 4. Augmentation of endogenous IT by an artificial analog or introduction of an artificial inward ILeak transformed all non-bistable TC neurones to bistable cells that expressed the full array of bistability-mediated behaviours, i.e. input signal amplification, slow oscillatory activity and membrane potential bistability. 5. These results demonstrate the existence of a non-negligible IT 'window' component in all TC neurones and suggest that rather than being a novel group of neurones, bistable cells are merely representative of an interesting region of dynamical modes in the (gT, gLeak) parameter space that may be expressed under certain physiological or pathological conditions by all TC neurones and other types of excitable cells that possess an IT 'window' component with similar biophysical properties.  (+info)

Troglitazone inhibits voltage-dependent calcium currents in guinea pig cardiac myocytes. (7/576)

BACKGROUND: It has been suggested that intracellular Ca2+ overload in cardiac myocytes leads to the development of diabetic cardiomyopathy. Troglitazone, an insulin-sensitizing agent, is a promising therapeutic agent for diabetes and has been shown to prevent diabetes-induced myocardial changes. To elucidate the underlying mechanism of troglitazone action on cardiac myocytes, the effects of troglitazone on voltage-dependent Ca2+ currents were examined and compared with classic Ca2+ antagonists (verapamil and nifedipine). METHODS AND RESULTS: Whole-cell voltage-clamp techniques were applied in single guinea pig atrial myocytes. Under control conditions with CsCl internal solution, the voltage-dependent Ca2+ currents consisted of both T-type (ICa,T) and L-type (ICa,L) Ca2+ currents. Troglitazone effectively reduced the amplitude of ICa,L in a concentration-dependent manner. Troglitazone also suppressed ICa,T, but the effect of troglitazone on ICa,T was less potent than that on ICa,L. The current-voltage relationships for ICa,L and the reversal potential for ICa,L were not altered by troglitazone. The half-maximal inhibitory concentration of troglitazone on ICa,L measured at a holding potential of -40 mV was 6.3 micromol/L, and 30 micromol/L troglitazone almost completely inhibited ICa,L. Troglitazone 10 micromol/L did not affect the time courses for inactivation of ICa,L and inhibited ICa,L mainly in a use-independent fashion, without shifting the voltage-dependency of inactivation. This effect was different from those of verapamil and nifedipine. Troglitazone also reduced isoproterenol- or cAMP-enhanced ICa,L. CONCLUSIONS: These results demonstrate that troglitazone inhibits voltage-dependent Ca2+ currents (T-type and L-type) and then antagonizes the effects of isoproterenol in cardiac myocytes, thus possibly playing a role in preventing diabetes-induced intracellular Ca2+ overload and subsequent myocardial changes.  (+info)

The effects of verapamil and diltiazem on N-, P- and Q-type calcium channels mediating dopamine release in rat striatum. (8/576)

1. The putative inhibitory effects of verapamil and diltiazem on neuronal non-L-type Ca2+ channels were studied by investigating their effects on either K+- or veratridine-evoked [3H]-dopamine ([3H]-DA) release in rat striatal slices. Involvement of N-, P- and Q-type channels was identified by sensitivity of [3H]-DA release to omega-conotoxin GVIA (omega-CTx-GVIA), omega-agatoxin IVA (omega-Aga-IVA) and omega-conotoxin MVIIC (omega-CTx-MVIIC), respectively. 2. KCl (50 mM)-evoked [3H]-DA release was abolished in the absence of Ca2+, and was insensitive to dihydropyridines (up to 30 microM). It was significantly blocked by omega-CTx-GVIA (1 microM), omega-Aga-IVA (30 nM) and was confirmed to be abolished by omega-CTx-MVIIC (3 microM), indicating involvement of N-, P- and Q-type channel subtypes. 3. Verapamil and diltiazem inhibited K+-evoked [3H]-DA release in a concentration-dependent manner. The inhibitory effects of verapamil or diltiazem (each 30 microM) were fully additive to the effect of omega-CTx-GVIA (1 microM), whereas co-application with omega-Aga-IVA (30 nM) produced similar effects to those of omega-Aga-IVA alone. 4. As shown previously, veratridine-evoked [3H]-DA release in Ca2+ containing medium exclusively involves Q-type Ca2+ channels. Here, diltiazem (30 microM) did not inhibit veratridine-evoked [3H]-DA release, whereas verapamil (30 microM) partially inhibited it, indicating possible involvement of Q-type channels in verapamil-induced inhibition. However, verapamil (30 microM) inhibited this release even in the absence of extracellular Ca2+, suggesting that Na+ rather than Q-type Ca2+ channels are involved. 5. Taken together, our results suggest that verapamil can block P- and at higher concentrations possibly N- and Q-type Ca2+ channels linked to [3H]-DA release, whereas diltiazem appears to block P-type Ca2+ channels only.  (+info)

Some common types of streptococcal infections include:

1. Strep throat (pharyngitis): an infection of the throat and tonsils that can cause fever, sore throat, and swollen lymph nodes.
2. Sinusitis: an infection of the sinuses (air-filled cavities in the skull) that can cause headache, facial pain, and nasal congestion.
3. Pneumonia: an infection of the lungs that can cause cough, fever, chills, and shortness of breath.
4. Cellulitis: an infection of the skin and underlying tissue that can cause redness, swelling, and warmth over the affected area.
5. Endocarditis: an infection of the heart valves, which can cause fever, fatigue, and swelling in the legs and abdomen.
6. Meningitis: an infection of the membranes covering the brain and spinal cord that can cause fever, headache, stiff neck, and confusion.
7. Septicemia (blood poisoning): an infection of the bloodstream that can cause fever, chills, rapid heart rate, and low blood pressure.

Streptococcal infections are usually treated with antibiotics, which can help clear the infection and prevent complications. In some cases, hospitalization may be necessary to monitor and treat the infection.

Prevention measures for streptococcal infections include:

1. Good hygiene practices, such as washing hands frequently, especially after contact with someone who is sick.
2. Avoiding close contact with people who have streptococcal infections.
3. Keeping wounds and cuts clean and covered to prevent bacterial entry.
4. Practicing safe sex to prevent the spread of streptococcal infections through sexual contact.
5. Getting vaccinated against streptococcus pneumoniae, which can help prevent pneumonia and other infections caused by this bacterium.

It is important to seek medical attention if you suspect you or someone else may have a streptococcal infection, as early diagnosis and treatment can help prevent complications and improve outcomes.

There are several types of channelopathies, including:

1. Long QT syndrome: This is a condition that affects the ion channels in the heart, leading to abnormal heart rhythms and increased risk of sudden death.
2. Short QT syndrome: This is a rare condition that has the opposite effect of long QT syndrome, causing the heart to beat too quickly.
3. Catecholaminergic polymorphic ventricular tachycardia (CPVT): This is a rare disorder that affects the ion channels in the heart, leading to abnormal heart rhythms and increased risk of sudden death.
4. Brugada syndrome: This is a condition that affects the ion channels in the heart, leading to abnormal heart rhythms and increased risk of sudden death.
5. Wolff-Parkinson-White (WPW) syndrome: This is a condition that affects the ion channels in the heart, leading to abnormal heart rhythms and increased risk of sudden death.
6. Neuromuscular disorders: These are disorders that affect the nerve-muscle junction, leading to muscle weakness and wasting. Examples include muscular dystrophy and myasthenia gravis.
7. Dystrophinopathies: These are a group of disorders that affect the structure of muscle cells, leading to muscle weakness and wasting. Examples include Duchenne muscular dystrophy and Becker muscular dystrophy.
8. Myotonia: This is a condition that affects the muscles, causing them to become stiff and rigid.
9. Hyperkalemic periodic paralysis: This is a rare condition that causes muscle weakness and paralysis due to abnormal potassium levels in the body.
10. Hypokalemic periodic paralysis: This is a rare condition that causes muscle weakness and paralysis due to low potassium levels in the body.
11. Thyrotoxic periodic paralysis: This is a rare condition that causes muscle weakness and paralysis due to an overactive thyroid gland.
12. Hyperthyroidism: This is a condition where the thyroid gland becomes overactive, leading to increased heart rate, weight loss, and muscle weakness.
13. Hypothyroidism: This is a condition where the thyroid gland becomes underactive, leading to fatigue, weight gain, and muscle weakness.
14. Pituitary tumors: These are tumors that affect the pituitary gland, which regulates hormone production in the body.
15. Adrenal tumors: These are tumors that affect the adrenal glands, which produce hormones such as cortisol and aldosterone.
16. Carcinoid syndrome: This is a condition where cancer cells in the digestive system produce hormones that can cause muscle weakness and wasting.
17. Multiple endocrine neoplasia (MEN): This is a genetic disorder that affects the endocrine system and can cause tumors to grow in the thyroid, adrenal, and parathyroid glands.

These are just some of the many potential causes of muscle weakness. It's important to see a healthcare professional for an accurate diagnosis and appropriate treatment.

There are two types of hypertension:

1. Primary Hypertension: This type of hypertension has no identifiable cause and is also known as essential hypertension. It accounts for about 90% of all cases of hypertension.
2. Secondary Hypertension: This type of hypertension is caused by an underlying medical condition or medication. It accounts for about 10% of all cases of hypertension.

Some common causes of secondary hypertension include:

* Kidney disease
* Adrenal gland disorders
* Hormonal imbalances
* Certain medications
* Sleep apnea
* Cocaine use

There are also several risk factors for hypertension, including:

* Age (the risk increases with age)
* Family history of hypertension
* Obesity
* Lack of exercise
* High sodium intake
* Low potassium intake
* Stress

Hypertension is often asymptomatic, and it can cause damage to the blood vessels and organs over time. Some potential complications of hypertension include:

* Heart disease (e.g., heart attacks, heart failure)
* Stroke
* Kidney disease (e.g., chronic kidney disease, end-stage renal disease)
* Vision loss (e.g., retinopathy)
* Peripheral artery disease

Hypertension is typically diagnosed through blood pressure readings taken over a period of time. Treatment for hypertension may include lifestyle changes (e.g., diet, exercise, stress management), medications, or a combination of both. The goal of treatment is to reduce the risk of complications and improve quality of life.

The symptoms of LEMS typically develop gradually over time and may include:

1. Muscle weakness that worsens with activity and improves with rest.
2. Weakness in the legs, hips, and shoulders.
3. Fatigue and muscle cramps.
4. Difficulty walking or standing upright.
5. Double vision or other eye problems.
6. Dry mouth and difficulty swallowing.
7. Increased heart rate and blood pressure.
8. Impaired reflexes.
9. Decreased sweating.
10. Weight loss.

The exact cause of LEMS is not known, but it is believed to be an autoimmune disorder in which the immune system mistakenly attacks the VGCCs in the neuromuscular junction. The condition is often associated with other autoimmune disorders such as thyroiditis, vitiligo, and adrenal insufficiency.

There is no cure for LEMS, but treatment options are available to manage the symptoms. These may include:

1. Immunosuppressive medications such as prednisone to reduce inflammation and suppress the immune system.
2. Intracranial pressure-lowering medications such as acetazolamide to reduce the pressure in the brain.
3. Muscle strengthening exercises to improve muscle function.
4. Physical therapy to maintain muscle strength and flexibility.
5. Orthostatic hypotension medications to manage orthostatic hypotension (a drop in blood pressure when standing).
6. Pain management medications to relieve muscle cramps, spasms, or pain.
7. Nutritional support to ensure adequate nutrition and prevent weight loss.
8. Respiratory support as needed to manage respiratory muscle weakness.
9. Speech therapy to improve communication skills.
10. Psychological support to cope with the emotional and social challenges of the condition.

It is important for individuals with LEMS to work closely with their healthcare team to manage their symptoms and prevent complications. With proper treatment, many people with LEMS can lead active and fulfilling lives.

The diagnosis of absence epilepsy is typically made based on a combination of clinical findings, including:
-A history of recurrent brief loss of awareness or staring spells
-Normal neurological examination between episodes
-Abnormal EEG activity during seizures (spikes or sharp waves)

Treatment for absence epilepsy usually involves medication, such as ethosuximide, valproic acid, or lamotrigine. In some cases, surgery may be considered if medications are ineffective or have significant side effects.

It is important to note that absence epilepsy can be a challenging condition to diagnose and treat, as the spells can be difficult to distinguish from other conditions such as daydreaming or attention deficit hyperactivity disorder (ADHD).

Some common types of calcium metabolism disorders include:

1. Hypocalcemia (low calcium levels): This can be caused by a deficiency in dietary calcium intake, malabsorption of calcium, or excessive urinary excretion of calcium. Symptoms can include muscle cramps, tremors, and tingling sensations in the fingers and toes.
2. Hypercalcemia (high calcium levels): This can be caused by an overactive parathyroid gland, cancer, or excessive intake of vitamin D. Symptoms can include fatigue, nausea, constipation, and kidney stones.
3. Osteoporosis: This is a condition characterized by weak and brittle bones that can lead to fractures. It is often associated with hormonal imbalances, vitamin D deficiency, or other factors that disrupt calcium metabolism.
4. Hyperparathyroidism (overactive parathyroid gland): This is a condition in which the parathyroid glands produce too much parathyroid hormone (PTH), leading to elevated calcium levels and potential complications such as kidney stones, bone loss, and cardiovascular disease.
5. Vitamin D-dependent rickets type 1: This is a rare genetic disorder that affects the body's ability to absorb vitamin D and maintain normal calcium levels. It can lead to softening of the bones and other skeletal deformities.
6. Familial hypophosphatemic rickets type 1: This is a rare genetic disorder that affects the body's ability to regulate phosphate levels, leading to softening of the bones and other skeletal deformities.
7. Tumor-induced osteomalacia: This is a condition in which cancerous tumors, typically found in the lung or breast, produce high levels of proteins that interfere with the body's ability to absorb vitamin D and maintain normal calcium levels. It can lead to softening of the bones and other skeletal deformities.
8. Chronic kidney disease: This is a condition in which the kidneys are not functioning properly, leading to elevated levels of phosphate and other waste products in the blood. It can lead to softening of the bones and other complications such as heart disease.
9. Paget's disease of bone: This is a condition that affects the way bones grow and repair themselves, leading to deformities and pain. It is often associated with inflammation and elevated levels of calcium in the blood.
10. Chronic alcoholism: Prolonged heavy drinking can lead to deficiencies in vitamin D and calcium, as well as other nutrients that are essential for bone health. It can increase the risk of osteoporosis and fractures.

1) They share similarities with humans: Many animal species share similar biological and physiological characteristics with humans, making them useful for studying human diseases. For example, mice and rats are often used to study diseases such as diabetes, heart disease, and cancer because they have similar metabolic and cardiovascular systems to humans.

2) They can be genetically manipulated: Animal disease models can be genetically engineered to develop specific diseases or to model human genetic disorders. This allows researchers to study the progression of the disease and test potential treatments in a controlled environment.

3) They can be used to test drugs and therapies: Before new drugs or therapies are tested in humans, they are often first tested in animal models of disease. This allows researchers to assess the safety and efficacy of the treatment before moving on to human clinical trials.

4) They can provide insights into disease mechanisms: Studying disease models in animals can provide valuable insights into the underlying mechanisms of a particular disease. This information can then be used to develop new treatments or improve existing ones.

5) Reduces the need for human testing: Using animal disease models reduces the need for human testing, which can be time-consuming, expensive, and ethically challenging. However, it is important to note that animal models are not perfect substitutes for human subjects, and results obtained from animal studies may not always translate to humans.

6) They can be used to study infectious diseases: Animal disease models can be used to study infectious diseases such as HIV, TB, and malaria. These models allow researchers to understand how the disease is transmitted, how it progresses, and how it responds to treatment.

7) They can be used to study complex diseases: Animal disease models can be used to study complex diseases such as cancer, diabetes, and heart disease. These models allow researchers to understand the underlying mechanisms of the disease and test potential treatments.

8) They are cost-effective: Animal disease models are often less expensive than human clinical trials, making them a cost-effective way to conduct research.

9) They can be used to study drug delivery: Animal disease models can be used to study drug delivery and pharmacokinetics, which is important for developing new drugs and drug delivery systems.

10) They can be used to study aging: Animal disease models can be used to study the aging process and age-related diseases such as Alzheimer's and Parkinson's. This allows researchers to understand how aging contributes to disease and develop potential treatments.

The QT interval is a measure of the time it takes for the ventricles to recover from each heartbeat and prepare for the next one. In people with LQTS, this recovery time is prolonged, which can disrupt the normal rhythm of the heart and increase the risk of arrhythmias.

LQTS is caused by mutations in genes that encode proteins involved in the cardiac ion channels, which regulate the flow of ions into and out of the heart muscle cells. These mutations can affect the normal functioning of the ion channels, leading to abnormalities in the electrical activity of the heart.

Symptoms of LQTS can include palpitations, fainting spells, and seizures. In some cases, LQTS can be diagnosed based on a family history of the condition or after a sudden death in an otherwise healthy individual. Other tests, such as an electrocardiogram (ECG), echocardiogram, and stress test, may also be used to confirm the diagnosis.

Treatment for LQTS typically involves medications that regulate the heart's rhythm and reduce the risk of arrhythmias. In some cases, an implantable cardioverter-defibrillator (ICD) may be recommended to monitor the heart's activity and deliver an electric shock if a potentially life-threatening arrhythmia is detected. Lifestyle modifications, such as avoiding stimuli that trigger symptoms and taking precautions during exercise and stress, may also be recommended.

In summary, Long QT syndrome is a rare inherited disorder that affects the electrical activity of the heart, leading to an abnormal prolongation of the QT interval and an increased risk of irregular and potentially life-threatening heart rhythms. It is important for individuals with LQTS to be closely monitored by a healthcare provider and to take precautions to manage their condition and reduce the risk of complications.

There are several types of kidney calculi, including:

1. Calcium oxalate calculi: These are the most common type of calculus and are often associated with conditions such as hyperparathyroidism or excessive intake of calcium supplements.
2. Uric acid calculi: These are more common in people with gout or a diet high in meat and sugar.
3. Cystine calculi: These are rare and usually associated with a genetic disorder called cystinuria.
4. Struvite calculi: These are often seen in women with urinary tract infections (UTIs).

Symptoms of kidney calculi may include:

1. Flank pain (pain in the side or back)
2. Pain while urinating
3. Blood in the urine
4. Cloudy or strong-smelling urine
5. Fever and chills
6. Nausea and vomiting

Kidney calculi are diagnosed through a combination of physical examination, medical history, and diagnostic tests such as X-rays, CT scans, or ultrasound. Treatment options for kidney calculi depend on the size and location of the calculus, as well as the severity of any underlying conditions. Small calculi may be treated with conservative measures such as fluid intake and medication to help flush out the crystals, while larger calculi may require surgical intervention to remove them.

Preventive measures for kidney calculi include staying hydrated to help flush out excess minerals in the urine, maintaining a balanced diet low in oxalate and animal protein, and avoiding certain medications that can increase the risk of calculus formation. Early detection and treatment of underlying conditions such as hyperparathyroidism or gout can also help prevent the development of kidney calculi.

Overall, kidney calculi are a common condition that can be managed with proper diagnosis and treatment. However, they can cause significant discomfort and potentially lead to complications if left untreated, so it is important to seek medical attention if symptoms persist or worsen over time.

The symptoms of hypokalemic periodic paralysis can vary in severity and may include:

* Muscle weakness or paralysis, typically affecting the legs but sometimes affecting the arms or face as well
* Muscle cramps and twitching
* Abnormal heart rhythms
* Weakness or paralysis of the respiratory muscles, which can lead to breathing difficulties
* Vision problems, such as blurred vision or double vision
* Dizziness and fainting

The exact cause of hypokalemic periodic paralysis is not known, but it is thought to be related to mutations in certain genes that affect the way potassium ions are regulated in the body. The disorder is usually diagnosed through a combination of clinical evaluation, laboratory tests, and genetic analysis.

There is no cure for hypokalemic periodic paralysis, but treatment options may include:

* Potassium supplements to maintain normal potassium levels in the blood
* Medications to regulate heart rhythms and prevent abnormal heartbeats
* Physical therapy to improve muscle strength and function
* Avoiding triggers such as stress, certain medications, or changes in potassium levels
* In severe cases, a pacemaker may be implanted to regulate the heartbeat.

It is important to note that hypokalemic periodic paralysis can be a challenging disorder to manage and may have a significant impact on quality of life. However, with proper treatment and management, many individuals with this condition are able to lead active and fulfilling lives.

Some common causes of hypocalcemia include:

1. Vitamin D deficiency: Vitamin D is essential for the absorption of calcium from the diet. A lack of vitamin D can lead to low levels of calcium in the blood.
2. Parathyroid gland disorders: The parathyroid glands are located in the neck and regulate calcium levels in the blood. Disorders such as hypoparathyroidism (underactive parathyroid glands) or hyperparathyroidism (overactive parathyroid glands) can cause hypocalcemia.
3. Malabsorption: Certain conditions, such as celiac disease or Crohn's disease, can lead to malabsorption of nutrients, including calcium.
4. Kidney problems: Kidney failure can cause hypocalcemia by reducing the amount of calcium that is excreted in the urine.
5. Hypomagnesemia (low levels of magnesium): Magnesium is important for calcium metabolism, and low levels of magnesium can contribute to hypocalcemia.

Symptoms of hypocalcemia can include:

1. Muscle cramps
2. Weakness
3. Twitching or tremors
4. Seizures
5. Tingling or numbness in the fingers and toes
6. Difficulty swallowing
7. Palpitations
8. Headaches
9. Fatigue
10. Depression

Treatment for hypocalcemia usually involves addressing the underlying cause of the condition. For example, if the condition is caused by a vitamin D deficiency, supplements may be prescribed. If the condition is caused by a parathyroid gland disorder, surgery may be necessary to remove the affected gland or glands. In some cases, calcium supplements may be prescribed to help restore normal calcium levels.

It's important to note that hypocalcemia can be a sign of an underlying condition, and it should be treated promptly to prevent complications. If you suspect you or someone you know may have hypocalcemia, it is important to seek medical attention as soon as possible. A healthcare professional can diagnose the condition and recommend appropriate treatment.

Causes:

* Genetic mutations or deletions
* Infections such as meningitis or encephalitis
* Stroke or bleeding in the brain
* Traumatic head injury
* Multiple sclerosis or other demyelinating diseases
* Brain tumors
* Cerebellar degeneration due to aging

Symptoms:

* Coordination difficulties, such as stumbling or poor balance
* Tremors or shaky movements
* Slurred speech and difficulty with fine motor skills
* Nystagmus (involuntary eye movements)
* Difficulty with gait and walking
* Fatigue, weakness, and muscle wasting

Diagnosis:

* Physical examination and medical history
* Neurological examination to test coordination, balance, and reflexes
* Imaging studies such as MRI or CT scans to rule out other conditions
* Genetic testing to identify inherited forms of cerebellar ataxia
* Electromyography (EMG) to test muscle activity and nerve function

Treatment:

* Physical therapy to improve balance, coordination, and gait
* Occupational therapy to help with daily activities and fine motor skills
* Speech therapy to address slurred speech and communication difficulties
* Medications to manage symptoms such as tremors or spasticity
* Assistive devices such as canes or walkers to improve mobility

Prognosis:

* The prognosis for cerebellar ataxia varies depending on the underlying cause. In some cases, the condition may be slowly progressive and lead to significant disability over time. In other cases, the condition may remain stable or even improve with treatment.

Living with cerebellar ataxia can be challenging, but there are many resources available to help individuals with the condition manage their symptoms and maintain their quality of life. These resources may include:

* Physical therapy to improve balance and coordination
* Occupational therapy to assist with daily activities
* Speech therapy to address communication difficulties
* Assistive devices such as canes or walkers to improve mobility
* Medications to manage symptoms such as tremors or spasticity
* Support groups for individuals with cerebellar ataxia and their families

Overall, the key to managing cerebellar ataxia is early diagnosis and aggressive treatment. With proper management, individuals with this condition can lead active and fulfilling lives despite the challenges they face.

There are many different types of cardiac arrhythmias, including:

1. Tachycardias: These are fast heart rhythms that can be too fast for the body's needs. Examples include atrial fibrillation and ventricular tachycardia.
2. Bradycardias: These are slow heart rhythms that can cause symptoms like fatigue, dizziness, and fainting. Examples include sinus bradycardia and heart block.
3. Premature beats: These are extra beats that occur before the next regular beat should come in. They can be benign but can also indicate an underlying arrhythmia.
4. Supraventricular arrhythmias: These are arrhythmias that originate above the ventricles, such as atrial fibrillation and paroxysmal atrial tachycardia.
5. Ventricular arrhythmias: These are arrhythmias that originate in the ventricles, such as ventricular tachycardia and ventricular fibrillation.

Cardiac arrhythmias can be diagnosed through a variety of tests including electrocardiograms (ECGs), stress tests, and holter monitors. Treatment options for cardiac arrhythmias vary depending on the type and severity of the condition and may include medications, cardioversion, catheter ablation, or implantable devices like pacemakers or defibrillators.

The symptoms of hypercalcemia may include:

* Fatigue
* Nausea and vomiting
* Weakness
* Constipation
* Abdominal pain
* Kidney stones
* Bone pain or fractures

If left untreated, hypercalcemia can lead to complications such as kidney damage, heart problems, and an increased risk of osteoporosis. Treatment options may include medications to reduce calcium levels, surgery to remove a tumor or overactive parathyroid gland, or dialysis if the patient has kidney failure.

Early diagnosis and treatment are important to prevent long-term complications and improve the patient's quality of life.

Neuroblastoma is caused by a genetic mutation that affects the development and growth of nerve cells. The cancerous cells are often sensitive to chemotherapy, but they can be difficult to remove surgically because they are deeply embedded in the nervous system.

There are several different types of neuroblastoma, including:

1. Infantile neuroblastoma: This type of neuroblastoma occurs in children under the age of one and is often more aggressive than other types of the cancer.
2. Juvenile neuroblastoma: This type of neuroblastoma occurs in children between the ages of one and five and tends to be less aggressive than infantile neuroblastoma.
3. Adult neuroblastoma: This type of neuroblastoma occurs in adults and is rare.
4. Metastatic neuroblastoma: This type of neuroblastoma has spread to other parts of the body, such as the bones or liver.

Symptoms of neuroblastoma can vary depending on the location and size of the tumor, but they may include:

* Abdominal pain
* Fever
* Loss of appetite
* Weight loss
* Fatigue
* Bone pain
* Swelling in the abdomen or neck
* Constipation
* Increased heart rate

Diagnosis of neuroblastoma typically involves a combination of imaging tests, such as CT scans and MRI scans, and biopsies to confirm the presence of cancerous cells. Treatment for neuroblastoma usually involves a combination of chemotherapy, surgery, and radiation therapy. The prognosis for neuroblastoma varies depending on the type of cancer, the age of the child, and the stage of the disease. In general, the younger the child and the more aggressive the treatment, the better the prognosis.

Neuralgia is often difficult to diagnose and treat, as the underlying cause can be challenging to identify. However, various medications and therapies can help manage the pain and other symptoms associated with this condition. These may include pain relievers, anticonvulsants, antidepressants, and muscle relaxants, as well as alternative therapies such as acupuncture or physical therapy.

Some common forms of neuralgia include:

1. Trigeminal neuralgia: This is a condition that affects the trigeminal nerve, which carries sensation from the face to the brain. It is characterized by sudden, intense pain in the face, typically on one side.
2. Postherpetic neuralgia (PHN): This is a condition that occurs after a shingles infection, and is characterized by persistent pain in the affected area.
3. Occipital neuralgia: This is a condition that affects the nerves in the back of the head and neck, and can cause pain in the back of the head, neck, and face.
4. Geniculate neuralgia: This is a rare condition that affects the nerves in the jaw and ear, and can cause pain in the jaw, face, and ear.

Overall, neuralgia is a complex and debilitating condition that can significantly impact an individual's quality of life. It is important for individuals experiencing symptoms of neuralgia to seek medical attention to determine the underlying cause and develop an appropriate treatment plan.

There are several types of ataxia, each with different symptoms and causes. Some common forms of ataxia include:

1. Spinocerebellar ataxia (SCA): This is the most common form of ataxia and is caused by a degeneration of the cerebellum and spinal cord. It can cause progressive weakness, loss of coordination, and difficulty with speaking and swallowing.
2. Friedreich's ataxia: This is the second most common form of ataxia and is caused by a deficiency of vitamin E in the body. It can cause weakness in the legs, difficulty walking, and problems with speech and language.
3. Ataxia-telangiectasia (AT): This is a rare form of ataxia that is caused by a gene mutation. It can cause progressive weakness, loss of coordination, and an increased risk of developing cancer.
4. Acute cerebellar ataxia: This is a sudden and temporary form of ataxia that can be caused by a variety of factors such as infections, injuries, or certain medications.
5. Drug-induced ataxia: Certain medications can cause ataxia as a side effect.
6. Vitamin deficiency ataxia: Deficiencies in vitamins such as vitamin B12 or folate can cause ataxia.
7. Metabolic disorders: Certain metabolic disorders such as hypothyroidism, hyperthyroidism, and hypoglycemia can cause ataxia.
8. Stroke or brain injury: Ataxia can be a result of a stroke or brain injury.
9. Multiple system atrophy (MSA): This is a rare progressive neurodegenerative disorder that can cause ataxia, parkinsonism, and autonomic dysfunction.
10. Spinocerebellar ataxia (SCA): This is a group of rare genetic disorders that can cause progressive cerebellar ataxia, muscle wasting, and other signs and symptoms.

It's important to note that this is not an exhaustive list and there may be other causes of ataxia not mentioned here. If you suspect you or someone you know may have ataxia, it is important to consult a healthcare professional for proper diagnosis and treatment.

There are several different types of pain, including:

1. Acute pain: This type of pain is sudden and severe, and it usually lasts for a short period of time. It can be caused by injuries, surgery, or other forms of tissue damage.
2. Chronic pain: This type of pain persists over a long period of time, often lasting more than 3 months. It can be caused by conditions such as arthritis, fibromyalgia, or nerve damage.
3. Neuropathic pain: This type of pain results from damage to the nervous system, and it can be characterized by burning, shooting, or stabbing sensations.
4. Visceral pain: This type of pain originates in the internal organs, and it can be difficult to localize.
5. Psychogenic pain: This type of pain is caused by psychological factors such as stress, anxiety, or depression.

The medical field uses a range of methods to assess and manage pain, including:

1. Pain rating scales: These are numerical scales that patients use to rate the intensity of their pain.
2. Pain diaries: These are records that patients keep to track their pain over time.
3. Clinical interviews: Healthcare providers use these to gather information about the patient's pain experience and other relevant symptoms.
4. Physical examination: This can help healthcare providers identify any underlying causes of pain, such as injuries or inflammation.
5. Imaging studies: These can be used to visualize the body and identify any structural abnormalities that may be contributing to the patient's pain.
6. Medications: There are a wide range of medications available to treat pain, including analgesics, nonsteroidal anti-inflammatory drugs (NSAIDs), and muscle relaxants.
7. Alternative therapies: These can include acupuncture, massage, and physical therapy.
8. Interventional procedures: These are minimally invasive procedures that can be used to treat pain, such as nerve blocks and spinal cord stimulation.

It is important for healthcare providers to approach pain management with a multi-modal approach, using a combination of these methods to address the physical, emotional, and social aspects of pain. By doing so, they can help improve the patient's quality of life and reduce their suffering.

There are several different types of calcinosis, each with its own unique causes and symptoms. Some common forms of calcinosis include:

1. Dystrophic calcinosis: This type of calcinosis occurs in people with muscular dystrophy, a group of genetic disorders that affect muscle strength and function. Dystrophic calcinosis can cause calcium deposits to form in the muscles, leading to muscle weakness and wasting.
2. Metastatic calcinosis: This type of calcinosis occurs when cancer cells spread to other parts of the body and cause calcium deposits to form. Metastatic calcinosis can occur in people with a variety of different types of cancer, including breast, lung, and prostate cancer.
3. Idiopathic calcinosis: This type of calcinosis occurs for no apparent reason, and the exact cause is not known. Idiopathic calcinosis can affect people of all ages and can cause calcium deposits to form in a variety of different tissues.
4. Secondary calcinosis: This type of calcidosis occurs as a result of an underlying medical condition or injury. For example, secondary calcinosis can occur in people with kidney disease, hyperparathyroidism (a condition in which the parathyroid glands produce too much parathyroid hormone), or traumatic injuries.

Treatment for calcinosis depends on the underlying cause and the severity of the condition. In some cases, treatment may involve managing the underlying disease or condition that is causing the calcium deposits to form. Other treatments may include medications to reduce inflammation and pain, physical therapy to improve mobility and strength, and surgery to remove the calcium deposits.

Causes: There are several causes of night blindness, including:

1. Vitamin A deficiency: Vitamin A is essential for the health of the retina, and a deficiency can lead to night blindness.
2. Retinitis pigmentosa: This is a group of inherited conditions that can cause progressive damage to the retina and result in night blindness.
3. Cataracts: A cataract can cause a person to become night blind by blocking the light that enters the eye.
4. Glaucoma: This is a group of eye conditions that can damage the optic nerve and lead to vision loss, including night blindness.
5. Other medical conditions: Certain medical conditions such as diabetes, multiple sclerosis, and stroke can cause night blindness.

Symptoms: The symptoms of night blindness can vary depending on the underlying cause, but common symptoms include:

1. Difficulty seeing in low light environments
2. Blind spots or missing areas of vision
3. Sensitivity to light
4. Glare or halos around lights
5. Difficulty adjusting to changes in light levels

Diagnosis: Night blindness is typically diagnosed through a comprehensive eye exam, which may include a visual acuity test, refraction test, and retinal examination. Imaging tests such as an OCT scan or retinal photography may also be used to evaluate the retina and optic nerve.

Treatment: The treatment of night blindness depends on the underlying cause. For example, vitamin A supplements may be prescribed for a vitamin A deficiency, while cataract surgery may be recommended for cataracts. In some cases, no treatment may be necessary, and the condition may resolve on its own over time.

Prevention: While some cases of night blindness are unavoidable, there are steps you can take to reduce your risk of developing the condition. These include:

1. Maintaining a healthy diet that includes foods rich in vitamin A and other essential nutrients for eye health.
2. Wearing sunglasses with UV protection to protect your eyes from excessive sunlight.
3. Avoiding smoking and excessive alcohol consumption, which can damage the optic nerve and retina.
4. Getting regular eye exams to detect any underlying eye problems early on.
5. Wearing protective eyewear when engaging in activities that could potentially harm your eyes, such as sports or working with hazardous materials.

Migraine with aura is considered to be a more severe form of migraine than migraine without aura, which does not have the same neurological symptoms before the headache. Migraine with aura is also associated with a higher risk of other health problems, such as stroke and dementia.

There are several treatments available for migraine with aura, including medications that can help to reduce the frequency and severity of the headaches, as well as lifestyle changes such as avoiding triggers and getting regular exercise. It is important for people who experience migraine with aura to work closely with their healthcare provider to develop an effective treatment plan.

* Type 1: Hypokalemic Periodic Paralysis (Hyperkalemia-induced muscle weakness)
* Type 2: Hyperkalemic Periodic Paralysis (K+ channels dysfunction, leading to muscle weakness)
* Type 3: Peripheral nerve damage causing FPPA
* Type 4: Central nervous system damage causing FPPA

Slide 3: Causes of Familial Periodic Paralysis (FPPA)

* Genetic mutations in SCN4A, KCNA1, and other genes involved in ion channel function
* Abnormalities in the expression and function of ion channels
* Autosomal dominant or recessive inheritance pattern

Slide 4: Symptoms of Familial Periodic Paralysis (FPPA)

* Muscle weakness or paralysis, often triggered by changes in diet, physical activity, or other environmental factors
* Weakness of the lower extremities more pronounced than the upper extremities
* Muscle cramps and twitching
* Abdominal pain
* Nausea and vomiting

Slide 5: Diagnosis of Familial Periodal Paralysis (FPPA)

* Clinical evaluation, including patient history and physical examination
* Electromyography (EMG) to assess muscle activity and diagnose FPPA
* Genetic testing to identify genetic mutations associated with FPPA
* Blood tests to measure potassium levels and rule out other conditions

Slide 6: Treatment of Familial Periodic Paralysis (FPPA)

* Potassium supplements to maintain normal potassium levels
* Avoiding triggers such as stress, cold temperature, and certain medications
* Physical therapy to improve muscle strength and function
* Pain management with analgesics and other medications as needed

Slide 7: Prognosis of Familial Periodic Paralysis (FPPA)

* FPPA is a chronic condition with no cure, but with proper management, patients can lead relatively normal lives
* The prognosis varies depending on the severity and frequency of attacks, as well as the presence of any complications
* Early diagnosis and treatment can improve the quality of life for patients with FPPA

Slide 8: Current Research in Familial Periodic Paralysis (FPPA)

* Genetic research to better understand the underlying causes of FPPA and develop new treatments
* Studies on the effectiveness of new medications and therapies for FPPA
* Investigation into the potential use of stem cells for treating FPPA

Slide 9: Current Challenges in Familial Periodic Paralysis (FPPA)

* Limited awareness and understanding of FPPA among healthcare professionals and the general public
* Lack of effective treatments for severe cases of FPPA
* Limited availability of specialized care and support for patients with FPPA

Slide 10: Conclusion

* Familial periodic paralysis (FPPA) is a rare and complex condition that affects both children and adults
* Early diagnosis and proper management are critical to improving the quality of life for patients with FPPA
* Ongoing research offers hope for new treatments and therapies, but more work needs to be done to increase awareness and understanding of this condition.

Insulinoma is a rare type of pancreatic tumor that produces excess insulin, leading to low blood sugar levels. These tumors are typically benign and can be treated with surgery or medication.

Insulinomas account for only about 5% of all pancreatic neuroendocrine tumors. They usually occur in the head of the pancreas and can cause a variety of symptoms, including:

1. Hypoglycemia (low blood sugar): The excess insulin produced by the tumor can cause blood sugar levels to drop too low, leading to symptoms such as shakiness, dizziness, confusion, and rapid heartbeat.
2. Hyperinsulinism (elevated insulin levels): In addition to hypoglycemia, insulinomas can also cause elevated insulin levels in the blood.
3. Abdominal pain: Insulinomas can cause abdominal pain and discomfort.
4. Weight loss: Patients with insulinomas may experience unexplained weight loss.
5. Nausea and vomiting: Some patients may experience nausea and vomiting due to the hypoglycemia or other symptoms caused by the tumor.

Insulinomas are usually diagnosed through a combination of imaging tests such as CT scans, MRI scans, and PET scans, and by measuring insulin and C-peptide levels in the blood. Treatment options for insulinomas include surgery to remove the tumor, medications to control hypoglycemia and hyperinsulinism, and somatostatin analogs to reduce hormone secretion.

Insulinoma is a rare and complex condition that requires careful management by a multidisciplinary team of healthcare professionals, including endocrinologists, surgeons, and radiologists. With appropriate treatment, most patients with insulinomas can experience long-term remission and improved quality of life.

Hyperalgesia is often seen in people with chronic pain conditions, such as fibromyalgia, and it can also be a side effect of certain medications or medical procedures. Treatment options for hyperalgesia depend on the underlying cause of the condition, but may include pain management techniques, physical therapy, and medication adjustments.

In clinical settings, hyperalgesia is often assessed using a pinprick test or other pain tolerance tests to determine the patient's sensitivity to different types of stimuli. The goal of treatment is to reduce the patient's pain and improve their quality of life.

There are different types of anoxia, including:

1. Cerebral anoxia: This occurs when the brain does not receive enough oxygen, leading to cognitive impairment, confusion, and loss of consciousness.
2. Pulmonary anoxia: This occurs when the lungs do not receive enough oxygen, leading to shortness of breath, coughing, and chest pain.
3. Cardiac anoxia: This occurs when the heart does not receive enough oxygen, leading to cardiac arrest and potentially death.
4. Global anoxia: This is a complete lack of oxygen to the entire body, leading to widespread tissue damage and death.

Treatment for anoxia depends on the underlying cause and the severity of the condition. In some cases, hospitalization may be necessary to provide oxygen therapy, pain management, and other supportive care. In severe cases, anoxia can lead to long-term disability or death.

Prevention of anoxia is important, and this includes managing underlying medical conditions such as heart disease, diabetes, and respiratory problems. It also involves avoiding activities that can lead to oxygen deprivation, such as scuba diving or high-altitude climbing, without proper training and equipment.

In summary, anoxia is a serious medical condition that occurs when there is a lack of oxygen in the body or specific tissues or organs. It can cause cell death and tissue damage, leading to serious health complications and even death if left untreated. Early diagnosis and treatment are crucial to prevent long-term disability or death.

There are two main types of myotonia:

1. Thomsen's disease: This is an inherited form of myotonia that affects the muscles of the face, neck, and limbs. It is caused by mutations in the CLCN1 gene and can be severe, causing difficulty with speaking, swallowing, and breathing.
2. Becker's muscular dystrophy: This is a form of muscular dystrophy that affects both the skeletal and cardiac muscles. It is caused by mutations in the DMPK gene and can cause myotonia, muscle weakness, and heart problems.

The symptoms of myotonia can vary depending on the severity of the condition and may include:

* Muscle stiffness and rigidity
* Spasms or twitches
* Difficulty with movement and mobility
* Fatigue and weakness
* Cramps
* Muscle wasting

Myotonia can be diagnosed through a combination of physical examination, medical history, and diagnostic tests such as electromyography (EMG) and muscle biopsy. There is no cure for myotonia, but treatment options may include:

* Physical therapy to improve movement and mobility
* Medications to relax muscles and reduce spasms
* Lifestyle modifications such as avoiding triggers and taking regular breaks to rest
* Surgery in severe cases to release or lengthen affected muscles.

It is important to note that myotonia can be a symptom of other underlying conditions, so proper diagnosis and management by a healthcare professional is essential to determine the best course of treatment.

There are many different types of seizures, each with its own unique set of symptoms. Some common types of seizures include:

1. Generalized seizures: These seizures affect both sides of the brain and can cause a range of symptoms, including convulsions, loss of consciousness, and muscle stiffness.
2. Focal seizures: These seizures affect only one part of the brain and can cause more specific symptoms, such as weakness or numbness in a limb, or changes in sensation or vision.
3. Tonic-clonic seizures: These seizures are also known as grand mal seizures and can cause convulsions, loss of consciousness, and muscle stiffness.
4. Absence seizures: These seizures are also known as petit mal seizures and can cause a brief loss of consciousness or staring spell.
5. Myoclonic seizures: These seizures can cause sudden, brief muscle jerks or twitches.
6. Atonic seizures: These seizures can cause a sudden loss of muscle tone, which can lead to falls or drops.
7. Lennox-Gastaut syndrome: This is a rare and severe form of epilepsy that can cause multiple types of seizures, including tonic, atonic, and myoclonic seizures.

Seizures can be diagnosed through a combination of medical history, physical examination, and diagnostic tests such as electroencephalography (EEG) or imaging studies. Treatment for seizures usually involves anticonvulsant medications, but in some cases, surgery or other interventions may be necessary.

Overall, seizures are a complex and multifaceted symptom that can have a significant impact on an individual's quality of life. It is important to seek medical attention if you or someone you know is experiencing seizures, as early diagnosis and treatment can help to improve outcomes and reduce the risk of complications.

The exact cause of malignant hyperthermia is not fully understood, but it is believed to be related to a genetic predisposition and exposure to certain anesthetic agents. The condition can be triggered by a variety of factors, including the use of certain anesthetics, stimulation of the sympathetic nervous system, and changes in blood sugar levels.

Symptoms of malignant hyperthermia can include:

* Elevated body temperature (usually above 104°F/40°C)
* Muscle rigidity and stiffness
* Heart arrhythmias and palpitations
* Shivering or tremors
* Confusion, agitation, or other neurological symptoms
* Shortness of breath or respiratory failure

If left untreated, malignant hyperthermia can lead to serious complications such as seizures, brain damage, and even death. Treatment typically involves the immediate discontinuation of any triggering anesthetic agents, cooling measures such as ice packs or cold compresses, and medications to help regulate body temperature and reduce muscle rigidity. In severe cases, mechanical ventilation may be necessary to support breathing.

Overall, malignant hyperthermia is a rare but potentially life-threatening condition that requires prompt recognition and treatment to prevent serious complications and improve outcomes.

The condition is characterized by the excessive growth of gum tissue, which can lead to:

1. Redness and swelling of the gums
2. Bleeding while brushing or flossing
3. Bad breath (halitosis)
4. Pocket formation between the teeth and gums
5. Gum recession
6. Tooth loss

Gingival hyperplasia can be treated by addressing the underlying cause, improving oral hygiene, and undergoing scaling and root planing procedures to remove plaque and tartar. In severe cases, surgical intervention may be necessary to remove excess gum tissue and restore the natural contours of the mouth.

It is important for individuals to practice good oral hygiene, including brushing at least twice a day with fluoride toothpaste, flossing daily, and receiving regular dental cleanings to prevent gingival hyperplasia and other gum diseases. Early detection and treatment can help prevent the progression of the condition and restore the health of the teeth and gums.

Myocardial ischemia can be caused by a variety of factors, including coronary artery disease, high blood pressure, diabetes, and smoking. It can also be triggered by physical exertion or stress.

There are several types of myocardial ischemia, including:

1. Stable angina: This is the most common type of myocardial ischemia, and it is characterized by a predictable pattern of chest pain that occurs during physical activity or emotional stress.
2. Unstable angina: This is a more severe type of myocardial ischemia that can occur without any identifiable trigger, and can be accompanied by other symptoms such as shortness of breath or vomiting.
3. Acute coronary syndrome (ACS): This is a condition that includes both stable angina and unstable angina, and it is characterized by a sudden reduction in blood flow to the heart muscle.
4. Heart attack (myocardial infarction): This is a type of myocardial ischemia that occurs when the blood flow to the heart muscle is completely blocked, resulting in damage or death of the cardiac tissue.

Myocardial ischemia can be diagnosed through a variety of tests, including electrocardiograms (ECGs), stress tests, and imaging studies such as echocardiography or cardiac magnetic resonance imaging (MRI). Treatment options for myocardial ischemia include medications such as nitrates, beta blockers, and calcium channel blockers, as well as lifestyle changes such as quitting smoking, losing weight, and exercising regularly. In severe cases, surgical procedures such as coronary artery bypass grafting or angioplasty may be necessary.

There are several types of acidosis, including:

1. Respiratory acidosis: This occurs when the lung's ability to remove carbon dioxide from the blood is impaired, leading to an increase in blood acidity.
2. Metabolic acidosis: This type of acidosis occurs when there is an excessive production of acid in the body due to factors such as diabetes, starvation, or kidney disease.
3. Mixed acidosis: This type of acidosis is a combination of respiratory and metabolic acidosis.
4. Severe acute respiratory acidosis (SARA): This is a life-threatening condition that occurs suddenly, usually due to a severe lung injury or aspiration of a corrosive substance.

The symptoms of acidosis can vary depending on the type and severity of the condition. Common symptoms include:

1. Fatigue
2. Weakness
3. Confusion
4. Headaches
5. Nausea and vomiting
6. Abdominal pain
7. Difficulty breathing
8. Rapid heart rate
9. Muscle twitching

If left untreated, acidosis can lead to complications such as:

1. Kidney damage
2. Seizures
3. Coma
4. Heart arrhythmias
5. Respiratory failure

Treatment of acidosis depends on the underlying cause and the severity of the condition. Some common treatments include:

1. Oxygen therapy
2. Medications to help regulate breathing and heart rate
3. Fluid and electrolyte replacement
4. Dietary changes
5. Surgery, in severe cases.

In conclusion, acidosis is a serious medical condition that can have severe consequences if left untreated. It is important to seek medical attention immediately if you suspect that you or someone else may have acidosis. With prompt and appropriate treatment, it is possible to effectively manage the condition and prevent complications.

There are many different types of epilepsy, each with its own unique set of symptoms and characteristics. Some common forms of epilepsy include:

1. Generalized Epilepsy: This type of epilepsy affects both sides of the brain and can cause a range of seizure types, including absence seizures, tonic-clonic seizures, and atypical absence seizures.
2. Focal Epilepsy: This type of epilepsy affects only one part of the brain and can cause seizures that are localized to that area. There are several subtypes of focal epilepsy, including partial seizures with complex symptoms and simple partial seizures.
3. Tonic-Clonic Epilepsy: This type of epilepsy is also known as grand mal seizures and can cause a loss of consciousness, convulsions, and muscle stiffness.
4. Lennox-Gastaut Syndrome: This is a rare and severe form of epilepsy that typically develops in early childhood and can cause multiple types of seizures, including tonic, atonic, and myoclonic seizures.
5. Dravet Syndrome: This is a rare genetic form of epilepsy that typically develops in infancy and can cause severe, frequent seizures.
6. Rubinstein-Taybi Syndrome: This is a rare genetic disorder that can cause intellectual disability, developmental delays, and various types of seizures.
7. Other forms of epilepsy include Absence Epilepsy, Myoclonic Epilepsy, and Atonic Epilepsy.

The symptoms of epilepsy can vary widely depending on the type of seizure disorder and the individual affected. Some common symptoms of epilepsy include:

1. Seizures: This is the most obvious symptom of epilepsy and can range from mild to severe.
2. Loss of consciousness: Some people with epilepsy may experience a loss of consciousness during a seizure, while others may remain aware of their surroundings.
3. Confusion and disorientation: After a seizure, some people with epilepsy may feel confused and disoriented.
4. Memory loss: Seizures can cause short-term or long-term memory loss.
5. Fatigue: Epilepsy can cause extreme fatigue, both during and after a seizure.
6. Emotional changes: Some people with epilepsy may experience emotional changes, such as anxiety, depression, or mood swings.
7. Cognitive changes: Epilepsy can affect cognitive function, including attention, memory, and learning.
8. Sleep disturbances: Some people with epilepsy may experience sleep disturbances, such as insomnia or sleepiness.
9. Physical symptoms: Depending on the type of seizure, people with epilepsy may experience physical symptoms such as muscle weakness, numbness or tingling, and sensory changes.
10. Social isolation: Epilepsy can cause social isolation due to fear of having a seizure in public or stigma associated with the condition.

It's important to note that not everyone with epilepsy will experience all of these symptoms, and some people may have different symptoms depending on the type of seizure they experience. Additionally, some people with epilepsy may experience additional symptoms not listed here.

Symptoms of pheochromocytoma can include:

* Rapid heartbeat
* High blood pressure
* Sweating
* Weight loss
* Fatigue
* Headaches
* Nausea and vomiting

If left untreated, pheochromocytoma can lead to complications such as heart failure, stroke, and even death. Therefore, it is important that individuals who experience any of the above symptoms seek medical attention as soon as possible.

Treatment options for pheochromocytoma may include surgery to remove the tumor, medication to manage symptoms, and in some cases, radiation therapy. In rare cases, the tumor may recur after treatment, so regular monitoring is necessary to ensure that any new symptoms are detected early on.

Overall, while pheochromocytoma is a rare and potentially life-threatening condition, prompt medical attention and appropriate treatment can help manage symptoms and prevent complications.

The R-type calcium channel is a type of voltage-dependent calcium channel. Like the others of this class, the α1 subunit forms ... "Entrez Gene: CACNA1E calcium channel, voltage-dependent, R type, alpha 1E subunit". Soong TW, Stea A, Hodson CD, Dubel SJ, ... This α1 subunit is also known as the calcium channel, voltage-dependent, R type, alpha 1E subunit (CACNA1E) or Cav2.3 which in ... They are poorly understood, but like Q-type calcium channels, they appear to be present in cerebellar granule cells. They have ...
Long-Lasting calcium channels). The new T-type channels were much different from the L-type calcium channels due to their ... are both blockers of T-type calcium channels; the second-line treatment, lamotrigine, although not a T-type calcium channel ... Calcium channel blockers (CCB) such as mibefradil can also block L-type calcium channels, other enzymes, as well as other ... Novel T-type calcium channel inhibitors have recently been discovered which more selectively target the CaV3.3 channel sub-type ...
N-type calcium channels also called Cav2.2 channels are voltage gated calcium channels that are localized primarily on the ... and this shows that only the N-type calcium channel, not the P/Q/L type calcium channels, are involved in the release of ... to block the N-type calcium channels, have produced alleviation of intractable pain. Blockade of the N-type calcium channel is ... blocking of N-type calcium channels reduce glomerular pressure through dilation of arterioles. N-type calcium channels have ...
P-type, and N-type. L-type calcium channels were peptide sequenced and it was found that there were 4 kinds of L-type calcium ... The L-type calcium channel (also known as the dihydropyridine channel, or DHP channel) is part of the high-voltage activated ... Unlike other voltage gated calcium channels, L-type calcium channels are resistant to ⍵-CT X (GVIA) and ⍵-AG A (IVA) inhibitory ... This channel has four isoforms: Cav1.1, Cav1.2, Cav1.3, and Cav1.4. L-type calcium channels are responsible for the excitation- ...
The Q-type calcium channel is a type of voltage-dependent calcium channel. Like the others of this class, the α1 subunit is the ... Q-Type+Calcium+Channel at the US National Library of Medicine Medical Subject Headings (MeSH) (Articles with short description ... They are poorly understood, but like R-type calcium channels, they appear to be present in cerebellar granule cells. They have ... Short description matches Wikidata, Protein pages needing a picture, Genes on human chromosome 19, Ion channels, ...
The P-type calcium channel is a type of voltage-dependent calcium channel. Similar to many other high-voltage-gated calcium ... P-type calcium channels play a similar role to the N-type calcium channel in neurotransmitter release at the presynaptic ... There are many different types of calcium channels, so to prove that the P/Q type calcium channels are directly involved, a P/Q ... corresponds to what is functionally defined as the P-type and Q-type isoforms. P-type and Q-type calcium channels are closely ...
... a protein in the voltage-dependent calcium channel complex. Calcium channels mediate the influx of calcium ions into the cell ... Calcium channel, voltage-dependent, T type, alpha 1H subunit, also known as CACNA1H, is a protein which in humans is encoded by ... "Entrez Gene: CACNA1H calcium channel, voltage-dependent, T type, alpha 1H subunit". Cribbs LL, Lee JH, Yang J, Satin J, Zhang Y ... 2003). "T-type calcium channel regulation by specific G-protein betagamma subunits". Nature. 424 (6945): 209-13. doi:10.1038/ ...
N-type, L-type, and T-type voltage-dependent calcium channels are present in the zona glomerulosa of the human adrenal gland, ... Calcium channel blockers (CCB), calcium channel antagonists or calcium antagonists are a group of medications that disrupt the ... may increase or enhance the effects of calcium channel blockade. N-type calcium channels are found in neurons and are involved ... The resulting increase in intracellular calcium has different effects in different types of cells. Calcium channel blockers ...
the receptor-operated calcium channels (in vasoconstriction) P2X receptors L-type calcium channel blockers are used to treat ... T-type calcium channel blockers are used to treat epilepsy. Increased calcium conductance in the neurons leads to increased ... A calcium channel is an ion channel which shows selective permeability to calcium ions. It is sometimes synonymous with voltage ... Calcium in biology - Use of calcium by organisms. "calcium channel" at Dorland's Medical Dictionary Striggow F, Ehrlich BE ( ...
High-voltage-gated calcium channels include the neural N-type channel blocked by ω-conotoxin GVIA, the R-type channel (R stands ... opening of the L-type calcium channel permits influx of calcium into the cell. The calcium binds to the calcium release ... See reference for an illustration of the signaling cascade involving L-type calcium channels in smooth muscle). L-type calcium ... Voltage-gated calcium channels (VGCCs), also known as voltage-dependent calcium channels (VDCCs), are a group of voltage-gated ...
... groups of ligand-gated ion channels for chloride that have been identified in many epithelial and endothelial cell types as ... The Calcium-Dependent Chloride Channel (Ca-ClC) proteins (or calcium-activated chloride channels (CaCCs), are heterogeneous ... "1.A.17 The Calcium-Dependent Chloride Channel (Ca-ClC) Family". TCDB. Retrieved 16 April 2016. "Calcium activated chloride ... and calcium-dependent chloride channel anoctamin (ANO or TMEM16) channels ANO1 is highly expressed in human gastrointestinal ...
It was concluded that there was a different unknown type of potassium channel allowing these currents. It is clear that SK ... Calcium-activated potassium channels are potassium channels gated by calcium, or that are structurally or phylogenetically ... These channels can only be opened by increased levels of intracellular calcium. This trait of SK channels suggests that they ... BK channel SK channel Slow after-hyperpolarisation Vergara, C.; Latorre, R.; Marrion, N. V.; Adelman, J. P. (1998). "Calcium- ...
A calcium channel opener is a type of drug which facilitates ion transmission through calcium channels. An example is Bay K8644 ... mucolipin TRP channels (TRPMLs) and purinergic receptors of the P2X channel type. Calcium channel blocker Schramm M, Thomas G, ... Calcium permeable ion channels in lysosomal membranes that may be activated by a luminal pH increase include two pore channels ... which is an analogue of nifedipine that specifically and directly activates L-type voltage-dependent calcium channels. In ...
... inhibits N-type calcium channels. The concentration of piracetam achieved in central nervous system after a typical ... is much higher than the concentration necessary to inhibit N-type calcium channels (IC50 of piracetam in rat neurons was 3 μM ... Piracetam may exert its global effect on brain neurotransmission via modulation of ion channels (i.e., Na+, K+). It has been ... It is hypothesized to act on ion channels or ion carriers, thus leading to increased neuron excitability. GABA brain metabolism ...
When an action potential depolarizes the cell membrane, voltage-gated Ca2+ channels (e.g., L-type calcium channels) are ... Calcium-induced calcium release (CICR) describes a biological process whereby calcium is able to activate calcium release from ... Iosub R, Avitabile D, Grant L, Tsaneva-Atanasova K, Kennedy HJ (March 2015). "Calcium-Induced calcium release during action ... Fabiato A (July 1983). "Calcium-induced release of calcium from the cardiac sarcoplasmic reticulum". The American Journal of ...
"Osteoprotegerin expression and secretion are regulated by calcium influx through the L-type voltage-sensitive calcium channel ... This gene encodes an alpha-1 subunit of a voltage-dependent calcium channel. Calcium channels mediate the influx of calcium ... Calcium channel, voltage-dependent, L type, alpha 1C subunit (also known as Cav1.2) is a protein that in humans is encoded by ... Calcium channel Calcium channel associated transcriptional regulator ENSG00000285479 GRCh38: Ensembl release 89: ...
"Molecular characterization of T-type calcium channels". Cell Calcium. 40 (2): 89-96. doi:10.1016/j.ceca.2006.04.012. PMID ... Seizures are believed to originate in the thalamus, where there is an abundance of T-type calcium channels such as those ... first-line treatment for seizures only by blocking the low-threshold calcium currents produced by T-type calcium channels in ... there is an association between mutations in the calcium channel, voltage-dependent, T type, alpha 1H subunit (CACNA1H), and ...
... inhibits P-type calcium channels Myasthenia gravis Botulinum toxin: inhibits SNARE proteins Calcium channel blockers ( ... and thereby affecting P-type calcium channels): Antibiotics (clindamycin, polymyxin) Magnesium: antagonizes P-type calcium ... Nicotinic receptors come in two main types, known as muscle-type and neuronal-type. The muscle-type can be selectively blocked ... nifedipine, diltiazem) do not affect P-channels. These drugs affect L-type calcium channels. The autonomic nervous system ...
... reversibly blocks N-type calcium channels. In addition, it has a low affinity for L or P/Q-type channels. The mechanism by ... Ptu1 is a toxin that can reversibly bind N-type calcium channels. Its isolated from the assassin bug Peirates turpis. The toxin ... Second, Ptu1 has a relatively low binding affinity for N-type calcium channels compared to MVIIA. A possible explanation for ... a toxin from the assassin bug Peirates turpis that blocks the voltage-sensitive calcium channel N-type". Biochemistry. 40 (43 ...
... are derivatives of 1,4-dihydropyridine that are used as L-type calcium channel ... Calcium channel blocker (including section on non-dihydropyridine calcium channel blockers) Calcium channel Dihydropyridine ... Dihydropyridine class L-type calcium channel blockers include, in alphabetical order (brand names vary in different countries ... Compared with certain other L-type calcium channel blockers (for example those of the phenylalkylamine class such as verapamil ...
Voltage-dependent calcium channel gamma-3 subunit is a protein that in humans is encoded by the CACNG3 gene. L-type calcium ... This gene is a member of the neuronal calcium channel gamma subunit gene subfamily of the PMP-22/EMP/MP20 family. This gene is ... "Entrez Gene: CACNG3 calcium channel, voltage-dependent, gamma subunit 3". Powers PA, Liu S, Hogan K, Gregg RG (1993). " ... It is an integral membrane protein that is thought to stabilize the calcium channel in an inactive (closed) state. This protein ...
Voltage-dependent calcium channel gamma-1 subunit is a protein that in humans is encoded by the CACNG1 gene. L-type calcium ... 1993). "Localization of the gamma-subunit of the skeletal muscle L-type voltage-dependent calcium channel gene (CACNLG) to ... and gamma-subunits of the human skeletal muscle L-type voltage-dependent calcium channel on chromosome 17q and exclusion as ... This gene is a member of the neuronal calcium channel gamma subunit gene subfamily of the PMP-22/EMP/MP20 family and is located ...
... is a chemical compound that functions as an L-type calcium channel agonist. Bay K8644 is used primarily as a ... Bay K8644 targets L-type voltage-gated calcium channels. It is the first positive inotropic agent shown to act specifically and ... that enhances calcium currents in guinea pig and calf myocardial cells. A new type of positive inotropic agent". Circ Res. 56 ( ... Calcium channel openers, Nitro compounds, All stub articles, Cardiovascular system drug stubs). ...
Voltage-dependent calcium channel gamma-4 subunit is a protein that in humans is encoded by the CACNG4 gene. L-type calcium ... This gene is a member of the neuronal calcium channel gamma subunit gene subfamily of the PMP-22/EMP/MP20 family and is located ... "Entrez Gene: CACNG4 calcium channel, voltage-dependent, gamma subunit 4". Gerhard DS, Wagner L, Feingold EA, et al. (2004). " ... Voltage-dependent calcium channel GRCh38: Ensembl release 89: ENSG00000075461 - Ensembl, May 2017 GRCm38: Ensembl release 89: ...
L-type calcium channels are composed of five subunits. The protein encoded by this gene represents one of these subunits, gamma ... Calcium channel, voltage-dependent, gamma subunit 2, also known as CACNG2 or stargazin is a protein that in humans is encoded ... "Entrez Gene: CACNG2 calcium channel, voltage-dependent, gamma subunit 2". Brandler WM, Antaki D, Gujral M, Noor A, Rosanio G, ... This gene is a member of the neuronal calcium channel gamma subunit gene subfamily of the PMP-22/EMP/MP20 family. Stargazin is ...
Unlike other calcium antagonists, cilnidipine can act on the N-type calcium channel in addition to acting on the L-type calcium ... It is a calcium antagonist accompanied with L-type and N-type calcium channel blocking functions. ... Due to its blocking action at the N-type and L-type calcium channel, cilnidipine dilates both arterioles and venules, reducing ... May 2002). "Cilnidipine is a novel slow-acting blocker of vascular L-type calcium channels that does not target protein kinase ...
"Entrez Gene: CACNA1F calcium channel, voltage-dependent, L type, alpha 1F subunit". Catterall WA, Perez-Reyes E, Snutch TP, ... a protein in the voltage-dependent calcium channel complex. Calcium channels mediate the influx of calcium ions into the cell ... 1998). "An L-type calcium-channel gene mutated in incomplete X-linked congenital stationary night blindness". Nat. Genet. 19 (3 ... Cav1.4 also known as the calcium channel, voltage-dependent, L type, alpha 1F subunit (CACNA1F), is a human gene. This gene ...
Cheng RC, Tikhonov DB, Zhorov BS (October 2009). "Structural model for phenylalkylamine binding to L-type calcium channels". ... Cheng RC, Tikhonov DB, Zhorov BS (October 2009). "Structural model for phenylalkylamine binding to L-type calcium channels". ... "L-type Ca2+ channel antagonists block voltage-dependent Ca2+ channels in identified leech neurons". Brain Research. 1013 (2): ... Devapamil is a calcium channel blocker. It is also known as desmethoxyverapamil, which is a phenylalkylamine (PAA) derivative. ...
Proximal muscle weakness is a product of pathogenic autoantibodies directed against P/Q-type voltage-gated calcium channels, ... which activates voltage-gated calcium channels to allow calcium ions to enter the neuron. Calcium ions bind to sensor proteins ... This type of tumor also expresses voltage-gated calcium channels. Oftentimes, LEMS also occurs alongside myasthenia gravis. ... by lengthening the time that voltage-gated calcium channels remain open after blocking voltage-gated potassium channels. In the ...
The T-type calcium channel is found in neurons throughout the brain. These channels produce particularly large currents in ... Recent research has also been conducted on the T-type calcium channel and how modulation of these channels may allow for the ... Antiepileptic drugs can control absence seizures by inhibiting the T-type calcium channels which prevents low-voltage calcium ... T-type calcium channels have been known to play a role in the spike-and-wave discharges of absence seizures. ...
For example, muscle contraction depends upon the movement of calcium, sodium and potassium through ion channels in the cell ... Three types of photosynthesis occur in plants, C3 carbon fixation, C4 carbon fixation and CAM photosynthesis. These differ by ... Hundreds of separate types of dehydrogenases remove electrons from their substrates and reduce NAD+ into NADH. This reduced ... Chemolithotrophy is a type of metabolism found in prokaryotes where energy is obtained from the oxidation of inorganic ...
The most widely used tocolytics include beta agonists, calcium channel blockers, and magnesium sulfate. The goal of ... Otherwise depending on how far along the pregnancy is, medications may be used to start labour or a type of surgery known as ... Levine D (15 March 2012). "Types of Forceps Used in Delivery". Healthline. Healthline Networks. Retrieved 10 August 2013. ... three channels to pass through it: the urethra, the vagina and the rectum. The infant's head and shoulders must go through a ...
It later becomes incorporated into the CatSper complex, a specialized calcium ion channel that enables spermatozoa motility. ... Han C, Chen T, Li N, Yang M, Wan T, Cao X (February 2007). "HDJC9, a novel human type C DnaJ/HSP40 member interacts with and ... Liu J, Xia J, Cho KH, Clapham DE, Ren D (June 2007). "CatSperbeta, a novel transmembrane protein in the CatSper channel complex ... Liu J, Xia J, Cho KH, Clapham DE, Ren D (June 2007). "CatSperbeta, a novel transmembrane protein in the CatSper channel complex ...
L type, alpha 1C subunit), DPYD (Dihydropyrimidine dehydrogenase [NADP+]), CACNB2 (Voltage-dependent L-type calcium channel ... miR-137 is located on human chromosome 1p22 and has been implicated to act as a tumor suppressor in several cancer types ... a well-known member of the Rho GTPase family found be upregulated in many human cancer types such as colorectal, testicular and ... and is reported to be frequently silenced by promoter hyper-methylation in many tumour types, including colorectal, gastric, ...
Mn2+ enters through voltage dependent calcium channels, is taken into intracellular organelles and is transported by the ... "Transsynaptic transport of wheat germ agglutinin expressed in a subset of type II taste cells of transgenic mice". BMC ...
With sixteen different identified genes for human calcium channels, this type of channel differs in function between cell types ... glutamate-gated ion channels, calcium-dependent chloride channels, monovalent cation:proton antiporters, type 1, and potassium ... Voltage-gated sodium channels and calcium channels are made up of a single polypeptide with four homologous domains. Each ... Voltage-gated ion-channels are usually ion-specific, and channels specific to sodium (Na+), potassium (K+), calcium (Ca2+), and ...
... studying the mechanisms of C-type inactivation in voltage-gated ion channels and the effects of neurotoxins and local ... Duchen at the University College London, Khodorov was studying calcium homeostasis, glutamate excitotoxicity and mitochondrial ... After Soviet science was liberalized in the 1960s, he moved to ion channels, developing as a leader in the actions of local ... At the Vishnevsky Institute of Surgery, the Khodorov laboratory carried out pioneering studies in the field of ion channel ...
... there is a short-circuit channel (i.e. a highly K-permeable ion channel) for potassium in the membrane, thus the voltage across ... In many types of tissue, ATP consumption by the Na⁺/K⁺-ATPases have been related to glycolysis. This was first discovered in ... This increased presence of calcium is what allows for the force of contraction to be increased. In the case of patients where ... This enzyme belongs to the family of P-type ATPases. The Na⁺/K⁺-ATPase helps maintain resting potential, affects transport, and ...
Other research has also suggested that calcium flow through N-type calcium channels is essential for normal breathing, and is ... L-type calcium channels are known to increase the frequency of action potentials in some neurons, which might be the reason ... P/Q-type calcium channels are mainly responsible for the release of neurotransmitters that excite, or activate, postsynaptic ... Fictive sigh depends critically on synaptic mechanisms that involve P/Q type calcium channels, suggestive of a subset of ...
In addition, calcium hydroxide commonly being produced by calcination of calcium carbonate releases yet more carbon dioxide ... As of 2006, almost all of the petroleum-based diesel fuel available in Europe and North America is of a ULSD type. However, ... According to a Discovery Channel article on Sonic Sea Journeys Deep into the Ocean over the last century, extremely loud noise ... usually calcium sulfate if flue gases are scrubbed by being passed through calcium hydroxide solution) which would have to be ...
... calcium channel blockers, and phenytoin) HHS is usually precipitated by an infection, myocardial infarction, stroke or another ... DKA usually occurs in type 1 diabetics whereas HHS is more common in type 2 diabetics. DKA is characterized by a rapid onset, ... The main risk factor is a history of diabetes mellitus type 2. Occasionally it may occur in those without a prior history of ... and abdominal pain Weakness Low blood pressure with standing The main risk factor is a history of diabetes mellitus type 2. ...
... the CNG ion channel is open allowing sodium and calcium to rush into the cell. The influx of calcium begins a cascade of events ... which are located on the membranes of the cilia have been classified as a complex type of ligand-gated metabotropic channels. ... Calcium first binds to calmodulin to form CaM. CaM will then bind to the CNG channel and close it, stopping the sodium and ... opens ion channels in the cell membrane, resulting in an influx of sodium and calcium ions into the cell, and an efflux of ...
... the β and γ subunits interact with N-type voltage gated calcium channels, to reduce action potential mediated influx of calcium ... Silver RB, Poonwasi KS, Seyedi N, Wilson SJ, Lovenberg TW, Levi R (Jan 2002). "Decreased intracellular calcium mediates the ... "Histamine Receptors: H3". IUPHAR Database of Receptors and Ion Channels. International Union of Basic and Clinical Pharmacology ...
The σ1 receptor has been shown to appear in a complex with voltage gated K+ channels (Kv1.4 and Kv1.5), leading to the idea ... Kekuda R, Prasad PD, Fei YJ, Leibach FH, Ganapathy V (December 1996). "Cloning and functional expression of the human type 1 ... that modulates calcium signaling through the IP3 receptor. In humans, the σ1 receptor is encoded by the SIGMAR1 gene. The σ1 ... Mutations in sigma-1 receptor have been associated with distal spinal muscular atrophy type 2. The following ligands have high ...
Subjects covered in the book include both traditional approaches to looking at arrhythmia, such as ion channel effects, and ... Overall, the book advocates for segregating drug targets by disease type and state, rather than the conventional approach of ... Novel ideas offered included studying sodium-calcium exchanger and ryanodine receptor effects. One chapter (5) is dedicated to ...
... closing calcium channels, and opening potassium channels. Opioids like oxycodone are thought to produce their analgesic effects ... It may improve quality of life in certain types of pain. It is unclear if use in chronic pain results in improved quality of ...
... characterized calcium channel types Frans Wackers (1977-1981, 1984-): nuclear cardiologist Brian Kobilka (1977-1981): ...
Bertelsen, Anne K.; Backonja, Misha-Miroslav (2007). "Drugs Targeting Voltage-Gated Sodium and Calcium Channels". Encyclopedia ... These metabolizer types include poor, intermediate, extensive, and ultrarapid metabolizers. Most people are extensive ... Doxepin is also a potent blocker of voltage-gated sodium channels, and this action is thought to be involved in both its ... Individuals can be categorized into different types of cytochrome P450 metabolizers depending on which genetic variations they ...
... the opening of calcium channels increasing in this way the cytosolic calcium concentrations. The lipophilic diacylglycerol ... a type of ion channel-linked receptor that is central in a neurotoxic process called excitotoxicity. Proteins called PDZ ... They can also inhibit glutamate release and can modulate voltage-dependent calcium channels. Group I mGluRs, but not other ... Eight different types of mGluRs, labeled mGluR1 to mGluR8 (GRM1 to GRM8), are divided into groups I, II, and III. Receptor ...
BPPV is a type of balance disorder along with labyrinthitis and Ménière's disease. It can result from a head injury or simply ... Within the labyrinth of the inner ear lie collections of calcium crystals known as otoconia or otoliths. In people with BPPV, ... These drugs vary considerably in their mechanisms of action, with many of them being receptor- or ion channel-specific. Among ... The Epley maneuver employs gravity to move the calcium crystal build-up from the posterior semicercular canal ( resulting in ...
"La Storia del Calcio: Il calcio dalle origini a oggi" (in Italian). Treccani: Enciclopedia dello Sport (2002). Retrieved 18 May ... A quick passing movement like a pair of one-two passes will leave the channel behind the defending full-back open. This ... there were often at least two types of centre-backs who played alongside one another: at least one man-to-man marking centre- ... Damele, Fulvio (1998). Calcio da manuale. Demetra. p. 104. Fontana, Mattia (7 July 2015). "L'evoluzione del libero: da Picchi a ...
... inhibit calcium N channels, and disinhibit K+A channels. There are at least two types of cannabinoid receptors (CB1 and CB2). ...
The three types of nephridia are: integumentary, septal, and pharyngeal. The integumentary nephridia lie attached to the inner ... Food moves into the esophagus, where calcium (from the blood and ingested from previous meals) is pumped in to maintain proper ... Physical: The earthworm's burrowing creates a multitude of channels through the soil and is of great value in maintaining the ... blood calcium levels in the blood and food pH. From there the food passes into the crop and gizzard. In the gizzard, strong ...
In May 2014, Publix began offering Amlodipine, a calcium channel blocker used to treat high blood pressure and chest pain ( ... The store marked the first under the Food World banner for Publix and would become the first of 22 more of the type. In ... Publix announced in August 2007, that it would offer several types of antibiotics free to its customers. Customers must have a ... In March 2010, Publix announced the launch of another free prescription, Metformin for Type II Diabetes, the generic of ...
... and large conductance calcium-activated potassium channel (BKCa) are the two primary channels for potassium secretion. WNK1 ... WNK1 has mutations associated with Gordon hyperkalemia-hypertension syndrome (pseudohypoaldosteronism Type II, featuring ... WNK1 regulates potassium channels found in the cortical collecting duct (CCD) and connecting tubule (CNT). Renal outer medullar ... GABA activates the GABAA receptor which is a Cl− ion channel. Cl− ions will enter the neuron causing hyperpolarization and ...
The enzyme calcium-independent phospholipase A2 (iPLA2) is most likely responsible for the apoptotic cell releasing LPC as it ... Four types of find-me signals released from apoptotic cells have been discovered: Lipid lysophosphatidylcholine (LPC) ... They are released through a pannexin family channel known as PANX1. PANX1 is a four pass transmembrane protein that forms large ... "Pannexin 1 channels mediate 'find-me' signal release and membrane permeability during apoptosis". Nature. 467 (7317): 863-867. ...
Different types of cells (e.g. bone marrow stem cells, T-cells) can be engineered to express a luciferase allowing their non- ... Therefore, in order to lower the pH, voltage-gated channels in the scintillon membrane are opened to allow the entry of protons ... Calcium triggers release of the luciferin (coelenterazine) from the luciferin binding protein. The substrate is then available ... "BL Web: Luciferin types". ISCID Encyclopedia of Science and Philosophy. ISCID. Archived from the original on 2012-09-21. ...
... s also inhibit magnesium and calcium reabsorption in the thick ascending limb. Absorption of magnesium and calcium ... The difference in voltage in both sides are set up by potassium recycling through renal outer medullary potassium channel. By ... Meanwhile, according to 2013 European Society of Cardiology (ESC) guidelines, a loop diuretic can only replace thiazide-type ... This causes the magnesium and calcium ions to be repelled from luminal side to interstitial side, promoting their absorption. ...
... calcium channel - calcium signaling - calcium-binding protein - calmodulin - calmodulin-binding protein - Calvin cycle - CAM ... IGF type 1 receptor - IGF type 2 receptor - IgG - IgM - immediate-early protein - immune cell - immune system - immunoglobulin ... Ion channel - ion channel gating - Ionic bond - ionization potential - iron-sulfur protein - isoenzyme - isoleucine - Isomer - ... interferon type I - interferon type II - interferon-alpha - interferon-beta - interleukin receptor - interleukin-1 receptor - ...
Calcium channel blockers. Class Summary. Nifedipine is used for its pulmonary vasodilative effects. It inhibits calcium ions ... Prevention and treatment of high altitude pulmonary edema by a calcium channel blocker. Int J Sports Med. 1992 Oct. 13 Suppl 1: ... Phosphodiesterase (type 5) enzyme inhibitor. Class Summary. This agent acts to increase available nitric oxide in pulmonary ... Tadalafil is a phosphodiesterase type 5 (PDE5) selective inhibitor. Inhibition of PDE5 increases cGMP activity, which increases ...
Downloading a figure as powerpoint requires a browser with javascript support. Enable javascript and try again For help please contact [email protected] ...
Overall, we have indentified an unrecognized regulation pathway of T-type calcium channels by SNARE proteins, and proposed the ... However, the underlying molecular mechanisms linking T-type calcium channels to vesicular exocytosis have remained enigmatic. ... In a recent study, we have reported that Ca(v)3.2 T-type channel forms a signaling complex with the neuronal Q-SNARE syntaxin- ... channels act as a major pathway for calcium entry near the resting membrane potential in a wide range of neuronal cell types. ...
Most work on this calcium toxicity hypothesis implicates the L-type calcium channel. However, we have recently found that under ... the T-type calcium channel can trigger a large after-depolarization and a corresponding influx of calcium into dopamine neuron ... depends on T-type, but not L-type calcium channels. Interestingly, not all dopamine neurons displayed this HI-ADP. Other ... T-type calcium channels trigger a hyperpolarization induced afterdepolarization in vulnerable subpopulation of substantia nigra ...
In intact cells, single-channel current amplitude and the time a channel stays in the open state increase with membra … ... and voltage-activated K channels has been recorded from cell-attached and inside-out excised membrane patches of cultured Y-1 ... Publication types * Research Support, Non-U.S. Govt MeSH terms * Adrenal Cortex / cytology* ... Calcium- and voltage-activated potassium channels in adrenocortical cell membranes Biochim Biophys Acta. 1985 Mar 28;814(1):96- ...
Mibefradil: A T-Type Calcium Channel Blocker BARBARA APGAR. Long-term Amphetamine Use in Children with ADHD JEFFREY T. KIRCHNER ... Hyperparathyroidism usually presents initially as an incidental finding of asymptomatic calcium elevation on a chemistry panel ...
... antihypertensive drugs without calcium channel blockers and a placebo tab … ... Publication types *. Clinical Trial Actions. * Search in PubMed * Search in MeSH * Add to Search ... Calcium channel blocker nisoldipine in chronic renal failure A Blau 1 , D Herzog, P Shechter, D Sachs, H E Eliahou ... Calcium channel blocker nisoldipine in chronic renal failure A Blau et al. Ren Fail. 1990. ...
... a new dihydropyridine calcium channel antagonist, was evaluated in a randomized, double-blind, placebo-controlled trial for ... The L-type channel antagonist isradipine is neuroprotective in a mouse model of Parkinsons disease. Ilijic E, Guzman JN, ... Antihypertensive activity of isradipine in humans: a new dihydropyridine calcium channel antagonist E B Nelson, J L Pool, A A ... Antihypertensive activity of isradipine in humans: a new dihydropyridine calcium channel antagonist E B Nelson et al. Clin ...
Acute visceral pain relief mediated by A3AR agonists in rats: involvement of N-type voltage-gated calcium channels. ... Recently, their activity has been related to the block of N-type voltage-gated Ca2+ channels (Cav2.2) in dorsal root ganglia ( ... Acute visceral pain relief mediated by A3AR agonists in rats: involvement of N-type voltag ...
Calcium channels -- physiology -- pharmacology -- congresses , Cell communication -- congresses , Calcium channel blockers -- ... Low-voltage-activated t-type calcium channels : proceedings from the International Electrophysiology meeting, Montpellier, 21- ... Item type. Current library. Call number. Copy number. Status. Date due. Barcode. ... JoëlMaterial type: TextPublication details: Chester : Adis International, 1998. Description: 394 pISBN: 1898970823Subject(s): ...
Mouse CACNa1S(Calcium Channel, Voltage Dependent, L-Type, Alpha 1S Subunit) ELISA Kit Mouse CACNa1S(Calcium Channel, Voltage ... Calcium Channel, Voltage Dependent, L-Type, Alpha 1S Subunit (CACNa1S) Polyclonal Antibody (Mouse), APC-Cy7. ... Calcium Channel, Voltage Dependent, L-Type, Alpha 1S Subunit (CACNa1S) Polyclonal Antibody (Mouse), APC. ... Calcium Channel, Voltage Dependent, L-Type, Alpha 1S Subunit (CACNa1S) Polyclonal Antibody (Mouse), Biotinylated. ...
Calcium Channel Blockers, Kidney Glomerulus, Calcium Channels, L-Type, Calcium Channels, T-Type ... Questioning the renoprotective role of L-type calcium channel blockers in chronic kidney disease using physiological modeling. ... Home Publications Questioning the renoprotective role of L-type calcium channel blockers in chronic kidney disease using ... Questioning the renoprotective role of L-type calcium channel blockers in chronic kidney disease using physiological modeling. ...
... a partially selective T-type calcium channel blocker, combined with hypofractionated radiation therapy (RT) in subjects with ... Calcium Channel Blockers. Membrane Transport Modulators. Molecular Mechanisms of Pharmacological Action. Calcium-Regulating ... Requirement for calcium channel blocker for blood pressure control that cannot be switched to an antihypertensive with an ... Neoplasms by Histologic Type. Neoplasms. Neoplasms, Glandular and Epithelial. Neoplasms, Nerve Tissue. Antihypertensive Agents ...
Calcium Channels and Local and Long Distance Signaling on Both Sides of the Synapse ... Publication Types: Lecture. Webcast Rights: This is a work of the United States Government. No copyright exists on this ... Calcium Channels, N-Type. Neuromuscular Junction. Synapses. Synaptic Transmission ... Calcium channels and local and long distance signaling on both sides of the synapse / Richard W. Tsien. ...
Antibodies for proteins involved in calcium channel regulator activity pathways, according to their Panther/Gene Ontology ... cookie.CK_DISPLAY_TYPE.value:. pageContext.request.scheme:http(not used). syndicationProtocol:https. syndicationExtensionPrefix ... cookie.CK_DISPLAY_TYPE.value:. pageContext.request:org.apache.struts2.dispatcher.StrutsRequestWrapper@3f22776e. Request ...
... signaling molecules and voltage-gated ion channels. In this review, we present and discuss the role of miRNAs in both cell-wide ... signaling molecules and voltage-gated ion channels. In this review, we present and discuss the role of miRNAs in both cell-wide ... voltage-gated ion channels (e.g., P/Q-type calcium channels), kinases (e.g., CAMKIIβ, PKA), cell-adhesion molecules (e.g., β3- ... miR-103 regulates the expression of the three subunits of the Cav1.2-comprising L-type calcium channel in rat spinal cord ...
Calcium-channel blockers are a type of medicine used to treat high blood pressure and heart rhythm disturbances. They are one ... The specific ingredients in each type of calcium-channel blocker vary. However, the main ingredient is called a calcium-channel ... Calcium-channel blockers are a type of medicine used to treat high blood pressure and heart rhythm disturbances. They are one ... Verapamil (a type of calcium channel blocker) overdose is associated with the highest mortality risk. ...
Calcium channel blockers (for high blood pressure).. *Amylin analogs / GLP-1 antagonists (to treat Type 2 diabetes). ... Around one-third of people with diabetes (Type 1 or Type 2) develop gastroparesis. Diabetes-related gastroparesis is a type of ... What are the different types of gastroparesis?. Healthcare providers often classify gastroparesis into sub-types based on ... What is the most common type of gastroparesis?. Most gastroparesis cases (between a quarter and a half) are labeled idiopathic ...
... inhibited cardiac L-type calcium channels (Chen et al., Mol. Pharmacol., 1999), and activated ATP-sensitive potassium channels ... Lu et al., J. Physiol., 2006; Figure 2). and activated ATP-sensitive potassium channels (Lu et al., J. Physiol., 2006; Figure 2 ...
Calcium channel blockers. Calcium channel blockers, such as diltiazem, are a type of medicine usually used to treat high blood ... Topical calcium channel blockers are thought to be about as effective as GTN ointment for treating anal fissures, and may be ... However, topical calcium channel blockers that are applied directly to the anus have also proved useful in treating some people ... Topical calcium channel blockers work by relaxing the sphincter muscle and increasing blood supply to the fissure. ...
It is anticipated that a 2.5 year cost reimbursement (completion) type contract will be awarded. INQUIRIES Request for Proposal ... PILOT STUDY OF A CALCIUM CHANNEL BLOCKER IN FEMALES WITH BIPOLARDISORDER NIH Guide, Volume 25, Number 20, June 21, 1996 RFP ... "Pilot Study of a Calcium Channel Blocker in Females with Bipolar Disorder" to (1) determine in the most cost effective manner, ... preliminary evidence of efficacy for calcium channel blockers such as verapamil in bipolar disorder, and (2) recruit ...
Sustained Activation of Hippocampal Lp-Type Voltage-Gated Calcium Channels by Tetanic Stimulation Jessica M. Schjött and Mark R ...
Disrupts calcium channel trafficking. Anticonvuslant and analgesic in vivo.Also available in simple stock solutions… ... Interacts with the α2δ subunit of L-type voltage gated Ca2+ channels. ... Interacts with the α2δ subunit of L-type voltage gated Ca2+ channels. Disrupts calcium channel trafficking. Anticonvuslant and ... By product type. Primary antibodies. Secondary antibodies. ELISA and Matched Antibody Pair Kits. Cell and tissue imaging tools ...
Synonyms: calcium release channel isoform 1, skrr, Ryr. Type: Gene. Species: Mus musculus (mouse) ... Name: a disintegrin-like and metallopeptidase (reprolysin type) with thrombospondin type 1 motif, 9 ... When maintaining a live colony, heterozygous mice may be bred together, bred with wild-type siblings, or bred with C57BL/6J ... Synonyms: Itpr-1, opt, wblo, InsP3R type I, P400, Ip3r, Pcp1, Pcp-1, IP3R1 ...
CALCIUM CHANNELS, N-TYPE CANALES DE CALCIO TIPO N CANAIS DE CÁLCIO TIPO L CALCIUM CHANNELS, L-TYPE CANALES DE CALCIO TIPO L ... CALCIUM CHANNELS, P-TYPE CANALES DE CALCIO TIPO P CANAIS DE CÁLCIO TIPO Q CALCIUM CHANNELS, Q-TYPE CANALES DE CALCIO TIPO Q ... CALCIUM CHANNELS, R-TYPE CANALES DE CALCIO TIPO R CANAIS DE CÁLCIO TIPO T CALCIUM CHANNELS, T-TYPE CANALES DE CALCIO TIPO T ...
Involvement of L-type calcium channels in temporal summation of a spinal reflex in the decerebrated rabbit. Journal of ... Open-channel blockade is less effective on GluN3B than GluN3A subunit-containing NMDA receptors European Journal of ... Open-channel blockade is less effective on GluN3B than GluN3A subunit-containing NMDA receptors European Journal of ...
MeSH Terms: Calcium Channels*; Calcium-Calmodulin-Dependent Protein Kinase Type 2*/metabolism; Calcium/metabolism; Endothelium/ ...
As ziconotides molecular site of action is N-type calcium channels and not opioid receptors, it is not addictive34. However, ... Neuronal calcium channel antagonists. Discrimination between calcium channel subtypes using.omega.-conotoxin from Conus magus ... namely N-type calcium channels21,22. Ziconotides success has peaked the interest of pharmaceutical companies and there are ... Miljanich, G. P. Ziconotide: neuronal calcium channel blocker for treating severe chronic pain. Curr. Med. Chem. 11, 3029-3040 ...
Amlodipine besylate is a type of medicine known as a calcium channel blocker (CCB). It is used to treat high blood pressure ( ... Amlodipine is a dihydropyridine calcium antagonist (calcium ion antagonist or slow-channel blocker) that inhibits the ... As with other calcium channel blockers, hemodynamic measurements of cardiac function at rest and during exercise (or pacing) in ... Amlodipine besylate tablets is a calcium channel blocker and may be used alone or in combination with other antihypertensive ...
  • Patients with a stable progression of chronic renal failure with a creatinine clearance of 15-45 mL/min were randomly assigned to two groups of antihypertensive therapy: 1--nisoldipine as the only antihypertensive agent and 2--antihypertensive drugs without calcium channel blockers and a placebo tablet instead of nisoldipine. (nih.gov)
  • The patients were already on a low-protein diet and some form of antihypertensive therapy but without calcium channel blockers. (nih.gov)
  • Furthermore, punch biopsies of the skin showed a markedly different calcium content in the two groups, which was significantly less in the nisoldipine-treated patients as compared with the patients not receiving calcium blockers. (nih.gov)
  • Questioning the renoprotective role of L-type calcium channel blockers in chronic kidney disease using physiological modeling. (nih.gov)
  • Calcium-channel blockers are a type of medicine used to treat high blood pressure and heart rhythm disturbances. (medlineplus.gov)
  • Other medicines may also contain calcium-channel blockers. (medlineplus.gov)
  • Calcium channel blockers, such as diltiazem , are a type of medicine usually used to treat high blood pressure (hypertension). (www.nhs.uk)
  • However, topical calcium channel blockers that are applied directly to the anus have also proved useful in treating some people with anal fissures. (www.nhs.uk)
  • Topical calcium channel blockers work by relaxing the sphincter muscle and increasing blood supply to the fissure. (www.nhs.uk)
  • Topical calcium channel blockers are thought to be about as effective as GTN ointment for treating anal fissures, and may be recommended if other medicines have not helped. (www.nhs.uk)
  • The mouse FST for mental depression to investigate the effect of model has been widely used in screening the calcium channel blockers, nifedipine and antidepressants because it is simple and has been verapamil, on the antidepressant action of reported to be reliable across laboratories. (who.int)
  • Although studies have suggested that calcium channel blocker (CCB) therapy mitigates the decline in renal function in humans with essential HTN, there are few long-term clinical studies that have determined the impact of CCBs in patients with hypertensive CKD. (nih.gov)
  • This is a dose-escalation study that will assess the safety and determine the maximum tolerated dose (MTD) of mibefradil dihydrochloride, a partially selective T-type calcium channel blocker, combined with hypofractionated radiation therapy (RT) in subjects with recurrent glioblastoma multiforme (GBM). (clinicaltrials.gov)
  • Calcium-channel blocker overdose occurs when someone takes more than the normal or recommended amount of this medicine. (medlineplus.gov)
  • The specific ingredients in each type of calcium-channel blocker vary. (medlineplus.gov)
  • Taking too much of a calcium-channel blocker can be very dangerous. (medlineplus.gov)
  • Verapamil (a type of calcium channel blocker) overdose is associated with the highest mortality risk. (medlineplus.gov)
  • four groups each received a single dose of the calcium channel blocker followed by a single dose of the antidepressant (with same doses used for either in the previous four groups). (who.int)
  • Isradipine (Sandoz PN 200-110), a new dihydropyridine calcium channel antagonist, was evaluated in a randomized, double-blind, placebo-controlled trial for antihypertensive efficacy in 24 patients with essential hypertension. (nih.gov)
  • However, the main ingredient is called a calcium-channel antagonist. (medlineplus.gov)
  • It is transmission of dopamine or NA decrease a highly specific antagonist of the L-type channel immobility, whereas agents having the opposite blocks [5]. (who.int)
  • This may be due to the fact that nifedipine on its own might act as an antidepressant but blocks one imipramine mechanism that depends on L-type calcium channel activation. (who.int)
  • causing inhibition of calcium entry associated with Behavioral despair is mediated by central depolarization. (who.int)
  • This was the first model to propose that bursting is driven primarily by calcium-dependent inhibition of ATP production in the mitochondria). (nih.gov)
  • Description: A competitive ELISA for quantitative measurement of Mouse Voltage dependent L type calcium channel subunit Alpha 1S(CACNA1S) in samples from blood, plasma, serum, cell culture supernatant and other biological fluids. (operatiebrp.nl)
  • Description: This is Double-antibody Sandwich Enzyme-linked immunosorbent assay for detection of Mouse Calcium Channel, Voltage Dependent, L-Type, Alpha 1S Subunit (CACNa1S) in Tissue homogenates and other biological fluids. (operatiebrp.nl)
  • Open-channel blockade is less effective on GluN3B than GluN3A subunit-containing NMDA receptors European Journal of Pharmacology. (nottingham.ac.uk)
  • 1. Dubel SJ, Starr TV, Hell J, Ahlijanian MK, Enyeart JJ, Catterall WA, and Snutch TP (1992) Molecular cloning of the α 1 subunit of an ω-conotoxin-sensitive calcium channel. (aspetjournals.org)
  • Interacts with the α2δ subunit of L-type voltage gated Ca 2+ channels. (abcam.com)
  • Because these channels can cause large calcium transients they may contribute to the vulnerability of specific SNc dopamine neurons in Parkinson's Disease. (nih.gov)
  • Recently, their activity has been related to the block of N-type voltage-gated Ca2+ channels (Cav2.2) in dorsal root ganglia ( DRG ) neurons . (bvsalud.org)
  • A Chay-Keizer-like model with bursting driven by calcium-activated potassium channels but ionic currents based more closely on measurements in beta cells rather than neurons. (nih.gov)
  • It inhibits calcium ions from entering the slow channels or select voltage-sensitive areas of vascular smooth muscle and myocardium during depolarization, producing a relaxation of coronary vascular smooth muscle and coronary vasodilation. (medscape.com)
  • There are previous reports suggesting a role for calcium ions in the secretory response of adrenocortical cells to ACTH. (nih.gov)
  • Dihydropyridine (DHP) or L-type CCBs preferentially vasodilate the afferent arteriole and have been associated with glomerular HTN and increases in proteinuria in animal models with low renal function. (nih.gov)
  • Therefore, it is possible that, as in other endocrine cells, these K channels modulate Ca influx across the plasma membrane and thus contribute to regulate steroid biosynthesis and release. (nih.gov)
  • Familial periodic paralyses are a group of inherited neurological disorders caused by mutations in genes that regulate sodium and calcium channels in nerve cells. (nih.gov)
  • The mathematical models and papers on this page trace out four decades of work from our lab and other labs building up progressively through iteration of experiment and theory a picture of how pancreatic beta cells generate the oscillations of electrical activity and calcium that regulate insulin secretion. (nih.gov)
  • Bursting was achieved by appending a calcium-activated potassium channel to voltage-dependent squid axon channels. (nih.gov)
  • 2. Stea A, Dubel SJ, and Snutch TP (1999) α 1B N-type calcium channel isoforms with distinct biophysical properties. (aspetjournals.org)
  • How do T-type calcium channels control low-threshold exocytosis? (inserm.fr)
  • However, the underlying molecular mechanisms linking T-type calcium channels to vesicular exocytosis have remained enigmatic. (inserm.fr)
  • This interaction that relies on specific Ca(v)3.2 molecular determinants, not only modulates T-type channel activity, but was also found essential to support low-threshold exocytosis upon Ca(v)3.2 channel expression in MPC 9/3L-AH chromaffin cells. (inserm.fr)
  • Overall, we have indentified an unrecognized regulation pathway of T-type calcium channels by SNARE proteins, and proposed the first molecular mechanism by which T-type channels could mediate low-threshold exocytosis. (inserm.fr)
  • Several reports have uncovered an unrecognized feature of T-type channels in the control of vesicular neurotransmitter and hormone release, a process so far thought to be mediated exclusively by high-voltage-activated calcium channels. (inserm.fr)
  • Tadalafil is a phosphodiesterase type 5 (PDE5) selective inhibitor. (medscape.com)
  • However, we have recently found that under hyperpolarized conditions, the T-type calcium channel can trigger a large after-depolarization and a corresponding influx of calcium into dopamine neuron dendrites. (nih.gov)
  • Around one-third of people with diabetes ( Type 1 or Type 2 ) develop gastroparesis. (clevelandclinic.org)
  • Diabetes-related gastroparesis is a type of diabetes-related neuropathy . (clevelandclinic.org)
  • 29. Understanding the glucoregulatory mechanisms of metformin in type 2 diabetes mellitus. (nih.gov)
  • As an example of specific treatment, sodium-glucose co-transporter 2 (SGLT2) inhibitors (eg, canagliflozin, empagliflozin) have gained wide use in the management of type 2 diabetes mellitus and have effects beyond glucose lowering that include reducing the risk of development or worsening of albuminuria. (medscape.com)
  • Specifically we have used computational modeling, electrophysiology, and two-photon calcium imaging in mouse midbrain slices to show that this hyperpolarization-induced afterdepolarization (HI-ADP) depends on T-type, but not L-type calcium channels. (nih.gov)
  • Survival depends on how much and what type of this medicine the person took and how quickly they receive treatment. (medlineplus.gov)
  • This paper explores calcium-dependent inactivation of L-type calcium channels in beta cells, proposing that inactivation depends on calcium in the micro- or nano-domain near open calcium channels rather than bulk calcium. (nih.gov)
  • Acute visceral pain relief mediated by A3AR agonists in rats: involvement of N-type voltage-gated calcium channels. (bvsalud.org)
  • Both impaired tubuloglomerular feedback and low baseline renal function exacerbated glomerular pressure, glomerulosclerosis, and the decline in renal function during L-type CCB treatment. (nih.gov)
  • However, simulating CCB therapy that inhibited both L- and T-type calcium channels increased efferent arteriolar vasodilation and alleviated glomerular damage. (nih.gov)
  • These simulations support the evidence that DHP (L-type) CCBs potentiate glomerular HTN during CKD and suggest that T/L-type CCBs are valuable in proteinuric renal disease treatment. (nih.gov)
  • for example, both antagonized calcium channel activity and decreased heart rates in male Sprague-Dawley rats after intravenous injection. (nih.gov)
  • Bursting electrical activity in pancreatic beta cells caused by Ca 2+ - and voltage-inactivated Ca2+ channels. (nih.gov)
  • Low-voltage-activated T-type calcium channels act as a major pathway for calcium entry near the resting membrane potential in a wide range of neuronal cell types. (inserm.fr)
  • The rest of neuroscience is moving towards more systematic technologies, large scale recording, thorough descriptions of cell types throughout the brain. (nih.gov)
  • This should apply to L-type calcium channels in other cell types. (nih.gov)
  • In this study, the effects of calcium channel antagonists on the antidepressant action of alprazolam and imipramine were investigated. (who.int)
  • With larger Ca concentrations, channel open probability increases and its voltage dependence is greater. (nih.gov)
  • 25. Multicenter, Prospective, Phase II and Biomarker Study of High-Dose Bevacizumab as Induction Therapy in Patients With Neurofibromatosis Type 2 and Progressive Vestibular Schwannoma. (nih.gov)
  • Most work on this calcium toxicity hypothesis implicates the L-type calcium channel. (nih.gov)
  • Laxatives are a type of medicine that can help you poo more easily. (www.nhs.uk)
  • By default, all articles on GreenMedInfo.com are sorted based on the content type which best reflects the data which most users are searching for. (greenmedinfo.com)
  • All types of volunteers are needed- those who are healthy or may have an illness or disease- of all different ages, sexes, races, and ethnicities to ensure that study results apply to as many people as possible, and that treatments will be safe and effective for everyone who will use them. (nih.gov)
  • When internal Ca concentration is close to 0.01 microM, channels are usually closed even at large depolarizing voltages. (nih.gov)
  • In intact cells, single-channel current amplitude and the time a channel stays in the open state increase with membrane depolarization. (nih.gov)
  • In excised patches bathed in symmetrical 130 mM K solutions, single-channel conductance is 170 pS. (nih.gov)
  • This model introduced the concept of phantom bursting, i.e., that the process that drives bursting may not be a single channel but a composite of two or more channels. (nih.gov)
  • Channel open probability is heavily influenced by the concentration of ionic Ca at the inner surface of the membrane in the range between 0.01 and 10 microM. (nih.gov)
  • Current flowing through single Ca- and voltage-activated K channels has been recorded from cell-attached and inside-out excised membrane patches of cultured Y-1 adrenocortical cells. (nih.gov)