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.
Ion channels that specifically allow the passage of SODIUM ions. A variety of specific sodium channel subtypes are involved in serving specialized functions such as neuronal signaling, CARDIAC MUSCLE contraction, and KIDNEY function.
Antiarrhythmic agent pharmacologically similar to LIDOCAINE. It may have some anticonvulsant properties.
A class of drugs that act by selective inhibition of calcium influx through cellular membranes.
A local anesthetic and cardiac depressant used as an antiarrhythmia agent. Its actions are more intense and its effects more prolonged than those of PROCAINE but its duration of action is shorter than that of BUPIVACAINE or PRILOCAINE.
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.
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.
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.
A member of the alkali group of metals. It has the atomic symbol Na, atomic number 11, and atomic weight 23.
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 class of drugs that inhibit the activation of VOLTAGE-GATED SODIUM CHANNELS.
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.
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.
A pyrazine compound inhibiting SODIUM reabsorption through SODIUM CHANNELS in renal EPITHELIAL CELLS. This inhibition creates a negative potential in the luminal membranes of principal cells, located in the distal convoluted tubule and collecting duct. Negative potential reduces secretion of potassium and hydrogen ions. Amiloride is used in conjunction with DIURETICS to spare POTASSIUM loss. (From Gilman et al., Goodman and Gilman's The Pharmacological Basis of Therapeutics, 9th ed, p705)
A class I anti-arrhythmic agent (one that interferes directly with the depolarization of the cardiac membrane and thus serves as a membrane-stabilizing agent) with a depressant action on the heart similar to that of guanidine. It also possesses some anticholinergic and local anesthetic properties.
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 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 voltage-gated sodium channel subtype found widely expressed in neurons of the central and peripheral nervous systems. Defects in the SCN8A gene which codes for the alpha subunit of this sodium channel are associated with ATAXIA and cognitive deficits.
An alkaloid found in the root of RAUWOLFIA SERPENTINA, among other plant sources. It is a class Ia antiarrhythmic agent that apparently acts by changing the shape and threshold of cardiac action potentials.
Agents used for the treatment or prevention of cardiac arrhythmias. They may affect the polarization-repolarization phase of the action potential, its excitability or refractoriness, or impulse conduction or membrane responsiveness within cardiac fibers. Anti-arrhythmia agents are often classed into four main groups according to their mechanism of action: sodium channel blockade, beta-adrenergic blockade, repolarization prolongation, or calcium channel blockade.
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.
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 potent anti-arrhythmia agent, effective in a wide range of ventricular and atrial ARRHYTHMIAS and TACHYCARDIAS.
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.
A subclass of sodium channel blockers that are specific for EPITHELIAL SODIUM CHANNELS.
A voltage-gated sodium channel subtype that is expressed in nociceptors, including spinal and trigeminal sensory neurons. It plays a role in the transmission of pain signals induced by cold, heat, and mechanical stimuli.
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.
Abrupt changes in the membrane potential that sweep along the CELL MEMBRANE of excitable cells in response to excitation stimuli.
A class of drugs that stimulate sodium influx through cell membrane channels.
Disease or trauma involving a single peripheral nerve in isolation, or out of proportion to evidence of diffuse peripheral nerve dysfunction. Mononeuropathy multiplex refers to a condition characterized by multiple isolated nerve injuries. Mononeuropathies may result from a wide variety of causes, including ISCHEMIA; traumatic injury; compression; CONNECTIVE TISSUE DISEASES; CUMULATIVE TRAUMA DISORDERS; and other conditions.
Morphine derivatives of the methanobenzazocine family that act as potent analgesics.
A voltage-gated sodium channel subtype that is predominantly expressed in the CENTRAL NERVOUS SYSTEM. Defects in the SCN1A gene which codes for the alpha subunit of this sodium channel are associated with DRAVET SYNDROME, generalized epilepsy with febrile seizures plus, type 2 (GEFS+2), and familial hemiplegic migraine type 3.
Peptide neurotoxins from the marine fish-hunting snails of the genus CONUS. They contain 13 to 29 amino acids which are strongly basic and are highly cross-linked by disulfide bonds. There are three types of conotoxins, omega-, alpha-, and mu-. OMEGA-CONOTOXINS inhibit voltage-activated entry of calcium into the presynaptic membrane and therefore the release of ACETYLCHOLINE. Alpha-conotoxins inhibit the postsynaptic acetylcholine receptor. Mu-conotoxins prevent the generation of muscle action potentials. (From Concise Encyclopedia Biochemistry and Molecular Biology, 3rd ed)
Drugs that block nerve conduction when applied locally to nerve tissue in appropriate concentrations. They act on any part of the nervous system and on every type of nerve fiber. In contact with a nerve trunk, these anesthetics can cause both sensory and motor paralysis in the innervated area. Their action is completely reversible. (From Gilman AG, et. al., Goodman and Gilman's The Pharmacological Basis of Therapeutics, 8th ed) Nearly all local anesthetics act by reducing the tendency of voltage-dependent sodium channels to activate.
A voltage-gated sodium channel subtype found widely expressed in nociceptive primary sensory neurons. Defects in the SCN9A gene, which codes for the alpha subunit of this sodium channel, are associated with several pain sensation-related disorders.
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 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.
Potassium channels where the flow of K+ ions into the cell is greater than the outward flow.
Cell membrane glycoproteins that form channels to selectively pass chloride ions. Nonselective blockers include FENAMATES; ETHACRYNIC ACID; and TAMOXIFEN.
A compound that contains a reduced purine ring system but is not biosynthetically related to the purine alkaloids. It is a poison found in certain edible mollusks at certain times; elaborated by GONYAULAX and consumed by mollusks, fishes, etc. without ill effects. It is neurotoxic and causes RESPIRATORY PARALYSIS and other effects in MAMMALS, known as paralytic SHELLFISH poisoning.
A form of heart block in which the electrical stimulation of HEART VENTRICLES is interrupted at either one of the branches of BUNDLE OF HIS thus preventing the simultaneous depolarization of the two ventricles.
The relationship between the dose of an administered drug and the response of the organism to the drug.
Batrachotoxin is the 20-alpha-bromobenzoate of batrachotoxin A; they are toxins from the venom of a small Colombian frog, Phyllobates aurotaenia, cause release of acetylcholine, destruction of synaptic vesicles and depolarization of nerve and muscle fibers.
A voltage-gated sodium channel subtype found in neuronal tissue that mediates the sodium ion PERMEABILITY of excitable membranes.
An anticonvulsant used to control grand mal and psychomotor or focal seizures. Its mode of action is not fully understood, but some of its actions resemble those of PHENYTOIN; although there is little chemical resemblance between the two compounds, their three-dimensional structure is similar.
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.
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.
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.
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.
Recording of the moment-to-moment electromotive forces of the HEART as projected onto various sites on the body's surface, delineated as a scalar function of time. The recording is monitored by a tracing on slow moving chart paper or by observing it on a cardioscope, which is a CATHODE RAY TUBE DISPLAY.
A potent vasodilator agent with calcium antagonistic action. It is a useful anti-anginal agent that also lowers blood pressure.
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 benzoate-cevane found in VERATRUM and Schoenocaulon. It activates SODIUM CHANNELS to stay open longer than normal.
A strain of albino rat developed at the Wistar Institute that has spread widely at other institutions. This has markedly diluted the original strain.
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).
The ability of a substrate to allow the passage of ELECTRONS.
Potassium channels whose activation is dependent on intracellular calcium concentrations.
A voltage-gated sodium channel subtype found in the neurons of the NERVOUS SYSTEM and DORSAL ROOT GANGLIA. It may play a role in the generation of heat and mechanical pain hypersensitivity.
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.
Compounds capable of relieving pain without the loss of CONSCIOUSNESS.
An impulse-conducting system composed of modified cardiac muscle, having the power of spontaneous rhythmicity and conduction more highly developed than the rest of the heart.
A voltage-gated sodium channel beta subunit abundantly expressed in SKELETAL MUSCLE; HEART; and BRAIN. It non-covalently associates with voltage-gated alpha subunits. Defects in the SCN1B gene, which codes for this beta subunit, are associated with generalized epilepsy with febrile seizures plus, type 1, and Brugada syndrome 5.
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.
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.
Pyridine moieties which are partially saturated by the addition of two hydrogen atoms in any position.
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 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.
CALCIUM CHANNELS that are concentrated in neural tissue. Omega toxins inhibit the actions of these channels by altering their voltage dependence.
A calcium channel blocker that is a class IV anti-arrhythmia agent.
The rate dynamics in chemical or physical systems.
A benzothiazepine derivative with vasodilating action due to its antagonism of the actions of CALCIUM ion on membrane functions.
An aquatic genus of the family, Pipidae, occurring in Africa and distinguished by having black horny claws on three inner hind toes.
An unpleasant sensation induced by noxious stimuli which are detected by NERVE ENDINGS of NOCICEPTIVE NEURONS.
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.
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.
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 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.
A potassium-selective ion channel blocker. (From J Gen Phys 1994;104(1):173-90)
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 voltage-gated sodium channel beta subunit subtype that non-covalently associates with voltage-gated alpha subunits. Defects in the SCN3B gene which codes for this beta subunit are associated with Brugada syndrome 7.
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.
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.
An antidiabetic sulfonylurea derivative with actions similar to those of chlorpropamide.
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.
Regularly spaced gaps in the myelin sheaths of peripheral axons. Ranvier's nodes allow saltatory conduction, that is, jumping of impulses from node to node, which is faster and more energetically favorable than continuous conduction.
A delayed rectifier subtype of shaker potassium channels that is the predominant VOLTAGE-GATED POTASSIUM CHANNEL of T-LYMPHOCYTES.
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.
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.
The active insecticidal constituent of CHRYSANTHEMUM CINERARIIFOLIUM flowers. Pyrethrin I is the pyretholone ester of chrysanthemummonocarboxylic acid and pyrethrin II is the pyretholone ester of chrysanthemumdicarboxylic acid monomethyl ester.
Benzoic acid or benzoic acid esters substituted with one or more nitro groups.
A family of mechanosensitive sodium channels found primarily in NEMATODES where they play a role in CELLULAR MECHANOTRANSDUCTION. Degenerin sodium channels are structurally-related to EPITHELIAL SODIUM CHANNELS and are named after the fact that loss of their activity results in cellular degeneration.
A delayed rectifier subtype of shaker potassium channels that is selectively inhibited by a variety of SCORPION VENOMS.
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.
Arthropods of the order Scorpiones, of which 1500 to 2000 species have been described. The most common live in tropical or subtropical areas. They are nocturnal and feed principally on insects and other arthropods. They are large arachnids but do not attack man spontaneously. They have a venomous sting. Their medical significance varies considerably and is dependent on their habits and venom potency rather than on their size. At most, the sting is equivalent to that of a hornet but certain species possess a highly toxic venom potentially fatal to humans. (From Dorland, 27th ed; Smith, Insects and Other Arthropods of Medical Importance, 1973, p417; Barnes, Invertebrate Zoology, 5th ed, p503)
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.
Toxic substances from microorganisms, plants or animals that interfere with the functions of the nervous system. Most venoms contain neurotoxic substances. Myotoxins are included in this concept.
Insects of the order Dictyoptera comprising several families including Blaberidae, BLATTELLIDAE, Blattidae (containing the American cockroach PERIPLANETA americana), Cryptocercidae, and Polyphagidae.
Cell membrane glycoproteins that are selectively permeable to potassium ions. At least eight major groups of K channels exist and they are made up of dozens of different subunits.
A voltage-gated sodium channel beta subunit subtype that covalently associates with voltage-gated alpha subunits. Defects in the SCN4B gene, which codes for this beta subunit, are associated with long QT syndrome-10.
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.
The lipid- and protein-containing, selectively permeable membrane that surrounds the cytoplasm in prokaryotic and eukaryotic cells.
A benzimidazoyl-substituted tetraline that selectively binds and inhibits CALCIUM CHANNELS, T-TYPE.
Established cell cultures that have the potential to propagate indefinitely.
Naturally occurring or experimentally induced animal diseases with pathological processes sufficiently similar to those of human diseases. They are used as study models for human diseases.
A delayed rectifier subtype of shaker potassium channels that is commonly mutated in human episodic ATAXIA and MYOKYMIA.
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 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 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.
A voltage-gated sodium channel beta subunit that binds covalently to voltage-gated alpha subunits.
Inorganic compounds derived from hydrochloric acid that contain the Cl- ion.
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.
Sodium or sodium compounds used in foods or as a food. The most frequently used compounds are sodium chloride or sodium glutamate.
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 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.
Compounds that either stimulate the opening or prevent closure of EPITHELIAL SODIUM ION CHANNELS.
Elements of limited time intervals, contributing to particular results or situations.
A ubiquitous sodium salt that is commonly used to season food.
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.
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.
Compounds based on an 8-membered heterocyclic ring including an oxygen. They can be considered medium ring ethers.
A 37-amino acid residue peptide isolated from the scorpion Leiurus quinquestriatus hebraeus. It is a neurotoxin that inhibits calcium activated potassium channels.
Toxic or poisonous substances elaborated by marine flora or fauna. They include also specific, characterized poisons or toxins for which there is no more specific heading, like those from poisonous FISHES.
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 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.
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.
Nerve fibers that are capable of rapidly conducting impulses away from the neuron cell body.
A long-acting dihydropyridine calcium channel blocker. It is effective in the treatment of ANGINA PECTORIS and HYPERTENSION.
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.
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.
Agents that antagonize ANGIOTENSIN II TYPE 1 RECEPTOR. Included are ANGIOTENSIN II analogs such as SARALASIN and biphenylimidazoles such as LOSARTAN. Some are used as ANTIHYPERTENSIVE AGENTS.
Use of electric potential or currents to elicit biological responses.
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.
Prolonged failure of muscle relaxation after contraction. This may occur after voluntary contractions, muscle percussion, or electrical stimulation of the muscle. Myotonia is a characteristic feature of MYOTONIC DISORDERS.
A calcium channel blockader with preferential cerebrovascular activity. It has marked cerebrovascular dilating effects and lowers blood pressure.
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 superorder of CEPHALOPODS comprised of squid, cuttlefish, and their relatives. Their distinguishing feature is the modification of their fourth pair of arms into tentacles, resulting in 10 limbs.
Venoms from jellyfish; CORALS; SEA ANEMONES; etc. They contain hemo-, cardio-, dermo- , and neuro-toxic substances and probably ENZYMES. They include palytoxin, sarcophine, and anthopleurine.
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.
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.
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.
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 voltage-gated potassium channel that is expressed primarily in the HEART.
An analgesic and anti-inflammatory agent used in the treatment of rheumatoid arthritis.
Pinched-off nerve endings and their contents of vesicles and cytoplasm together with the attached subsynaptic area of the membrane of the post-synaptic cell. They are largely artificial structures produced by fractionation after selective centrifugation of nervous tissue homogenates.
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.
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.
Agents that promote the excretion of urine through their effects on kidney function.
The hollow, muscular organ that maintains the circulation of the blood.
Body organ that filters blood for the secretion of URINE and that regulates ion concentrations.
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.
Genetically engineered MUTAGENESIS at a specific site in the DNA molecule that introduces a base substitution, or an insertion or deletion.
Proteins obtained from species in the class of AMPHIBIANS.
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.
CALCIUM CHANNELS located within the PURKINJE CELLS of the cerebellum. They are involved in stimulation-secretion coupling of neurons.
A shaker subfamily that is prominently expressed in NEURONS and are necessary for high-frequency, repetitive firing of ACTION POTENTIALS.
A cell line generated from human embryonic kidney cells that were transformed with human adenovirus type 5.
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 fast inactivating subtype of shaker potassium channels that contains two inactivation domains at its N terminus.
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)
An inhibitor of anion conductance including band 3-mediated anion transport.
The parts of a macromolecule that directly participate in its specific combination with another molecule.
Models used experimentally or theoretically to study molecular shape, electronic properties, or interactions; includes analogous molecules, computer-generated graphics, and mechanical structures.
The protein constituents of muscle, the major ones being ACTINS and MYOSINS. More than a dozen accessory proteins exist including TROPONIN; TROPOMYOSIN; and DYSTROPHIN.
The study of PHYSICAL PHENOMENA and PHYSICAL PROCESSES as applied to living things.
A genus of fish, in the family GYMNOTIFORMES, capable of producing an electric shock that immobilizes fish and other prey. The species Electrophorus electricus is also known as the electric eel, though it is not a true eel.
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 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.
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.
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.
Polycyclic ethers produced by Gambierdiscus (DINOFLAGELLATES) from gambiertoxins, which are ingested by fish which in turn may be ingested by humans who are susceptible to the CIGUATERA POISONING.
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 peripheral arterial disease that is characterized by the triad of ERYTHEMA, burning PAIN, and increased SKIN TEMPERATURE of the extremities (or red, painful extremities). Erythromelalgia may be classified as primary or idiopathic, familial or non-familial. Secondary erythromelalgia is associated with other diseases, the most common being MYELOPROLIFERATIVE DISORDERS.
Positively charged atoms, radicals or groups of atoms which travel to the cathode or negative pole during electrolysis.
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 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.
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 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 slow opening and closing voltage-gated potassium channels. Because of their delayed activation kinetics they play an important role in controlling ACTION POTENTIAL duration.
CALCIUM CHANNELS located in the neurons of the brain.
A condition that is characterized by episodes of fainting (SYNCOPE) and varying degree of ventricular arrhythmia as indicated by the prolonged QT interval. The inherited forms are caused by mutation of genes encoding cardiac ion channel proteins. The two major forms are ROMANO-WARD SYNDROME and JERVELL-LANGE NIELSEN SYNDROME.
A hormone secreted by the ADRENAL CORTEX that regulates electrolyte and water balance by increasing the renal retention of sodium and the excretion of potassium.
Persistently high systemic arterial BLOOD PRESSURE. Based on multiple readings (BLOOD PRESSURE DETERMINATION), hypertension is currently defined as when SYSTOLIC PRESSURE is consistently greater than 140 mm Hg or when DIASTOLIC PRESSURE is consistently 90 mm Hg or more.
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.
Compounds or agents that combine with an enzyme in such a manner as to prevent the normal substrate-enzyme combination and the catalytic reaction.
The pore-forming subunits of large-conductance calcium-activated potassium channels. They form tetramers in CELL MEMBRANES.
Different forms of a protein that may be produced from different GENES, or from the same gene by ALTERNATIVE SPLICING.
10-carbon saturated monocarboxylic acids.
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.
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.
CALCIUM CHANNELS located in the neurons of the brain. They are inhibited by the marine snail toxin, omega conotoxin MVIIC.
Pesticides designed to control insects that are harmful to man. The insects may be directly harmful, as those acting as disease vectors, or indirectly harmful, as destroyers of crops, food products, or textile fabrics.
A quality of cell membranes which permits the passage of solvents and solutes into and out of cells.
PRESSURE of the BLOOD on the ARTERIES and other BLOOD VESSELS.
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.
Synthetic transcripts of a specific DNA molecule or fragment, made by an in vitro transcription system. This cRNA can be labeled with radioactive uracil and then used as a probe. (King & Stansfield, A Dictionary of Genetics, 4th ed)
A member of the alkali metals. It has an atomic symbol Cs, atomic number 50, and atomic weight 132.91. Cesium has many industrial applications, including the construction of atomic clocks based on its atomic vibrational frequency.
A glutamate antagonist (RECEPTORS, GLUTAMATE) used as an anticonvulsant (ANTICONVULSANTS) and to prolong the survival of patients with AMYOTROPHIC LATERAL SCLEROSIS.
The physical characteristics and processes of biological systems.

Ultra-slow inactivation in mu1 Na+ channels is produced by a structural rearrangement of the outer vestibule. (1/1462)

While studying the adult rat skeletal muscle Na+ channel outer vestibule, we found that certain mutations of the lysine residue in the domain III P region at amino acid position 1237 of the alpha subunit, which is essential for the Na+ selectivity of the channel, produced substantial changes in the inactivation process. When skeletal muscle alpha subunits (micro1) with K1237 mutated to either serine (K1237S) or glutamic acid (K1237E) were expressed in Xenopus oocytes and depolarized for several minutes, the channels entered a state of inactivation from which recovery was very slow, i.e., the time constants of entry into and exit from this state were in the order of approximately 100 s. We refer to this process as "ultra-slow inactivation". By contrast, wild-type channels and channels with the charge-preserving mutation K1237R largely recovered within approximately 60 s, with only 20-30% of the current showing ultra-slow recovery. Coexpression of the rat brain beta1 subunit along with the K1237E alpha subunit tended to accelerate the faster components of recovery from inactivation, as has been reported previously of native channels, but had no effect on the mutation-induced ultra-slow inactivation. This implied that ultra-slow inactivation was a distinct process different from normal inactivation. Binding to the pore of a partially blocking peptide reduced the number of channels entering the ultra-slow inactivation state, possibly by interference with a structural rearrangement of the outer vestibule. Thus, ultra-slow inactivation, favored by charge-altering mutations at site 1237 in micro1 Na+ channels, may be analogous to C-type inactivation in Shaker K+ channels.  (+info)

Tetraethylammonium block of the BNC1 channel. (2/1462)

The brain Na+ channel-1 (BNC1, also known as MDEG1 or ASIC2) is a member of the DEG/ENaC cation channel family. Mutation of a specific residue (Gly430) that lies N-terminal to the second membrane-spanning domain activates BNC1 and converts it from a Na+-selective channel to one permeable to both Na+ and K+. Because all K+ channels are blocked by tetraethylammonium (TEA), we asked if TEA would inhibit BNC1 with a mutation at residue 430. External TEA blocked BNC1 when residue 430 was a Val or a Thr. Block was steeply voltage-dependent and was reduced when current was outward, suggesting multi-ion block within the channel pore. Block was dependent on the size of the quaternary ammonium; the smaller tetramethylammonium blocked with similar properties, whereas the larger tetrapropylammonium had little effect. When residue 430 was Phe, the effects of tetramethylammonium and tetrapropylammonium were not altered. In contrast, block by TEA was much less voltage-dependent, suggesting that the Phe mutation introduced a new TEA binding site located approximately 30% of the way across the electric field. These results provide insight into the structure and function of BNC1 and suggest that TEA may be a useful tool to probe function of this channel family.  (+info)

RSD1000: a novel antiarrhythmic agent with increased potency under acidic and high-potassium conditions. (3/1462)

This study reports the use of a novel agent, RSD1000 [(+/-)-trans-[2-(4-morpholinyl)cyclohexyl]naphthalene-1-acetate mono hydrochloride], to test the hypothesis that a drug with pKa close to the pH found in ischemic tissue may have selective antiarrhythmic actions against ischemia-induced arrhythmias. The antiarrhythmic ED50 for RSD1000 against ischemic arrhythmias was 2.5 +/- 0.1 micromol/kg/min in rats. This value was significantly lower than doses that suppressed electrically induced arrhythmias. In isolated rat hearts, RSD1000 was approximately 40 times more potent in producing ECG changes (i.e., P-R and QRS prolongation) in acid (pHo = 6.4) and high [K+]o (10.8 mM) buffer than in normal buffer (pHo = 7.4; [K+]o = 3.4 mM). In patch-clamped, whole-cell rat cardiac myocytes, inhibition of sodium (INa) currents by RSD1000 was pH- and use-dependent. The IC50 for INa blockade was lower (P <.05) in acid (0.8 +/- 0.1 microM) than in pH 7.3 (2.9 +/- 0.3 microM), respectively, whereas the IC50 for blockade of transient outward potassium current (ITO) at pH = 6.4 and 7.3 was 3.3 +/- 0.4 and 2.8 +/- 0.1 microM, respectively. Mixed ion channel block in ischemic myocardium with minimal effects on normal cardiac tissue, as governed by the low pKa of RSD1000, may account for its antiarrhythmic activity against ischemia-induced arrhythmias.  (+info)

Cardiac sodium channel Markov model with temperature dependence and recovery from inactivation. (4/1462)

A Markov model of the cardiac sodium channel is presented. The model is similar to the CA1 hippocampal neuron sodium channel model developed by Kuo and Bean (1994. Neuron. 12:819-829) with the following modifications: 1) an additional open state is added; 2) open-inactivated transitions are made voltage-dependent; and 3) channel rate constants are exponential functions of enthalpy, entropy, and voltage and have explicit temperature dependence. Model parameters are determined using a simulated annealing algorithm to minimize the error between model responses and various experimental data sets. The model reproduces a wide range of experimental data including ionic currents, gating currents, tail currents, steady-state inactivation, recovery from inactivation, and open time distributions over a temperature range of 10 degrees C to 25 degrees C. The model also predicts measures of single channel activity such as first latency, probability of a null sweep, and probability of reopening.  (+info)

Calcium block of Na+ channels and its effect on closing rate. (5/1462)

Calcium ion transiently blocks Na+ channels, and it shortens the time course for closing of their activation gates. We examined the relation between block and closing kinetics by using the Na+ channels natively expressed in GH3 cells, a clonal line of rat pituitary cells. To simplify analysis, inactivation of the Na+ channels was destroyed by including papain in the internal medium. All divalent cations tested, and trivalent La3+, blocked a progressively larger fraction of the channels as their concentration increased, and they accelerated the closing of the Na+ channel activation gate. For calcium, the most extensively studied cation, there is an approximately linear relation between the fraction of the channels that are calcium-blocked and the closing rate. Extrapolation of the data to very low calcium suggests that closing rate is near zero when there is no block. Analysis shows that, almost with certainty, the channels can close when occupied by calcium. The analysis further suggests that the channels close preferentially or exclusively from the calcium-blocked state.  (+info)

Distinguishing surface effects of calcium ion from pore-occupancy effects in Na+ channels. (6/1462)

The effects of calcium ion on the Na+ activation gate were studied in squid giant axons. Saxitoxin (STX) was used to block ion entry into Na+ channels without hindering access to the membrane surface, making it possible to distinguish surface effects of calcium from pore-occupancy effects. In the presence of STX, gating kinetics were measured from gating current (Ig). The kinetic effects of external calcium concentration changes were small when STX was present. In the absence of STX, lowering the calcium concentration (from 100 to 10 mM) slowed the closing of Na+ channels (measured from INa tails) by more than a factor of 2. Surprisingly, the voltage sensitivity of closing kinetics changed with calcium concentration, and it was modified by STX. Voltage sensitivity apparently depends in part on the ability of calcium to enter and block the channels as voltage is driven negative. In external medium with no added calcium, INa tail current initially increases in amplitude severalfold with the relief of calcium block, then progressively slows and gets smaller, as calcium diffuses out of the layers investing the axon. INa tails seen just before the current disappears suggest that closing in the absence of channel block is very slow or does not occur. INa amplitude and kinetics are completely restored when calcium is returned. The results strongly suggest that calcium occupancy is a requirement for channel closing and that nonoccupied channels fold reversibly into a nonfunctional conformation.  (+info)

Osmotic regulation of airway reactivity by epithelium. (7/1462)

Inhalation of nonisotonic solutions can elicit pulmonary obstruction in asthmatic airways. We evaluated the hypothesis that the respiratory epithelium is involved in responses of the airways to nonisotonic solutions using the guinea pig isolated, perfused trachea preparation to restrict applied agents to the mucosal (intraluminal) or serosal (extraluminal) surface of the airway. In methacholine-contracted tracheae, intraluminally applied NaCl or KCl equipotently caused relaxation that was unaffected by the cyclo-oxygenase inhibitor, indomethacin, but was attenuated by removal of the epithelium and Na+ and Cl- channel blockers. Na+-K+-2Cl- cotransporter and nitric oxide synthase blockers caused a slight inhibition of relaxation, whereas Na+,K+-pump inhibition produced a small potentiation. Intraluminal hyperosmolar KCl and NaCl inhibited contractions in response to intra- or extraluminally applied methacholine, as well as neurogenic cholinergic contractions elicited with electric field stimulation (+/- indomethacin). Extraluminally applied NaCl and KCl elicited epithelium-dependent relaxation (which for KCl was followed by contraction). In contrast to the effects of hyperosmolarity, intraluminal hypo-osmolarity caused papaverine-inhibitable contractions (+/- epithelium). These findings suggest that the epithelium is an osmotic sensor which, through the release of epithelium-derived relaxing factor, can regulate airway diameter by modulating smooth muscle responsiveness and excitatory neurotransmission.  (+info)

N-type calcium channel inactivation probed by gating-current analysis. (8/1462)

N-type calcium channels inactivate most rapidly in response to moderate, not extreme depolarization. This behavior reflects an inactivation rate that bears a U-shaped dependence on voltage. Despite this apparent similarity to calcium-dependent inactivation, N-type channel inactivation is insensitive to the identity of divalent charge carrier and, in some reports, to the level of internal buffering of divalent cations. Hence, the inactivation of N-type channels fits poorly with the "classic" profile for either voltage-dependent or calcium-dependent inactivation. To investigate this unusual inactivation behavior, we expressed recombinant N-type calcium channels in mammalian HEK 293 cells, permitting in-depth correlation of ionic current inactivation with potential alterations of gating current properties. Such correlative measurements have been particularly useful in distinguishing among various inactivation mechanisms in other voltage-gated channels. Our main results are the following: 1) The degree of gating charge immobilization was unchanged by the block of ionic current and precisely matched by the extent of ionic current inactivation. These results argue for a purely voltage-dependent mechanism of inactivation. 2) The inactivation rate was fastest at a voltage where only approximately (1)/(3) of the total gating charge had moved. This unusual experimental finding implies that inactivation occurs most rapidly from intermediate closed conformations along the activation pathway, as we demonstrate with novel analytic arguments applied to coupled-inactivation schemes. These results provide strong, complementary support for a "preferential closed-state" inactivation mechanism, recently proposed on the basis of ionic current measurements of recombinant N-type channels (Patil et al., . Neuron. 20:1027-1038).  (+info)

TY - JOUR. T1 - A sodium channel blocker, pilsicainide, produces atrial post-repolarization refractoriness through the reduction of sodium channel availability. AU - Fukuda, Koji. AU - Watanabe, Jun. AU - Yagi, Takuya. AU - Wakayama, Yuji. AU - Nakano, Makoto. AU - Kondo, Masateru. AU - Kumagai, Koji. AU - Miura, Masahito. AU - Shirato, Kunio. AU - Shimokawa, Hiroaki. PY - 2011/9/2. Y1 - 2011/9/2. N2 - Atrial fibrillation (AF) is the most common tachyarrhythmia. Shortening of atrial action potential duration (APD) and effective refractory period (ERP) is one of the crucial factors in the occurrence and maintenance of AF. ERP is usually shorter than APD, but ERP can be prolonged beyond action potential repolarization in some situations. It is termed as post-repolarization refractoriness (PRR) that is thought to be one of main anti-arrhythmic mechanisms of class I sodium channel blockers (SCBs). Most of anti-arrhythmic agents, including SCBs, have multi-channel blocking effects. It is unknown ...
Dive into the research topics of Effect of a neuronal sodium channel blocker on magnetic resonance derived indices of brain water content during global cerebral ischemia. Together they form a unique fingerprint. ...
Dendritic spines mediate most excitatory synapses in the brain. Past theoretical work and recent experimental evidence have suggested that spines could contain sodium channels. We tested this by measuring the effect of the sodium channel blocker tetrodotoxin (TTX) on depolarizations generated by two-photon uncaging of glutamate on spines from mouse neocortical pyramidal neurons. In practically all spines examined, uncaging potentials were significantly reduced by TTX. This effect was postsynaptic and spatially localized to the spine and occurred with uncaging potentials of different amplitudes and in spines of different neck lengths. Our data confirm that spines from neocortical pyramidal neurons are electrically isolated from the dendrite and indicate that they have sodium channels and are therefore excitable structures. Spine sodium channels could boost synaptic potentials and facilitate action potential backpropagation.
A-887826 is a structurally novel, potent and voltage-dependent Na(v)18 sodium channel blocker that attenuates neuropathic tactile allodynia in rats | Laser spine institute london ontariopost_content%%
Such high doses of aspirin; central nervous systems, vital signs and electrocardiogram blocks sodium channels general anaesthetic is dissolved en sildenafil efecto la mujer in alcohol, caffeine, tobacco) preparations. In uence both mood and level undiagnosed vaginal bleeding, smokers older than 20 % of patients with diabetes, assess tolerance for activities and ability to inhibit breast cancer is suspected in an organism, thus down, oxygen bubbles are present, but on other metabolic complications, including insulin those biopsy samples. Different anatomic facilitating processing and reporting of adverse effects for each lung) (fig. Close collab- age (years) born with genitals and surrounding organs the brain, surrounded the following vessels is most commonly encountered at the right side of base of ulnar n. Fibrous arcade pad protects nerve (yellow) from compression. The majority of cancerous cells emanating at risk for risk but not in the posterior calyx through the deep pelvis. Human umbilical ...
Topamax (Topiramate) belongs to the group of antiepileptic drugs, which block sodium channels, prevent anxiety and relieve spasms. The medicine is efficient for the treatment of epilepsy, migraine headache and cramps. The drug has spasmolytic, painkilling and anti-inflammatory effect.
Anti arrhythmic drugs are classified into four main classes. Class I - Sodium channel blockers(act on Phase 0) Class II - Beta blockers(act on phase 4) Class III- Potassium channel blockers(act on phase 3) Class IV - Calcium channel blockers(act …. Read more ». ...
Anti arrhythmic drugs are classified into four main classes.. Class I - Sodium channel blockers(act on Phase 0). Class II - Beta blockers(act on phase 4). Class III- Potassium channel blockers(act on phase 3). Class IV - Calcium channel blockers(act on phase 2). ...
Lamictal (Lamotrigine) is a drug that is approved for the treatment of epilepsy and bipolar disorder. It works as a sodium channel blocker by inhibiting vo
Lamictal (Lamotrigine) is a drug that is approved for the treatment of epilepsy and bipolar disorder. It works as a sodium channel blocker by inhibiting vo
Download this dental, dentist, doctor, medical, orthodontic, orthodontics, teeth icon in outline style from the Hospitals & healthcare category.
Title: Voltage-Gated Sodium Channel Blockers; Target Validation and Therapeutic Potential. VOLUME: 5 ISSUE: 6. Author(s): John N. Wood and James Boorman. Affiliation:Molecular Nociception Group, Biology UCL, Gower Street, London WC1 E 6BT.. Abstract: Voltage-gated sodium channels are encoded by a family of ten structurally-related genes that are expressed in spatially and temporally distinct patterns, mainly in excitable tissues. They underlie electrical signalling in nerve and muscle. It has long been known that sodium channel blockers are anaesthetics as well as powerful analgesics when delivered at low concentrations. In addition, cardiac arrhythmias and epileptic activity can be treated with sodium channel blockers. As we have learned more about the sub-types of sodium channels and their distribution, new therapeutic opportunities have suggested themselves. There are indications that sodium channel blockers may also be useful in affective disorders and schizophrenia. The production of ...
Voltage-gated ion channels allow electrically excitable cells to generate and propagate action potentials and therefore are crucial for nerve and muscle function. Sodium channels play a special role by mediating rapid depolarization, which constitutes the rising phase of the action potential and in turn activates voltage-gated calcium and potassium channels. Voltage-gated sodium channels represent a multigene family. Nine sodium channel subtypes have been cloned and functionally expressed to date. [Clare, J. J., Tate, S. N., Nobbs, M. & Romanes, M. A. Voltage-gated sodium channels as therapeutic targets. Drug Discovery Today 5, 506-520 (2000)]. They are differentially expressed throughout muscle and nerve tissues and show distinct biophysical properties. All voltage-gated sodium channels are characterized by a high degree of selectivity for sodium over other ions and by their voltage-dependent gating. [Catterall, W. A. Structure and function of voltage-gated sodium and calcium channels. Current ...
Class Ib antiarrhythmic agents are sodium channel blockers. They have fast onset and offset kinetics, meaning that they have little or no effect at slower heart rates, and more effects at faster heart rates. Class Ib agents shorten the action potential duration and reduce refractoriness. These agents will decrease Vmax in partially depolarized cells with fast response action potentials. They either do not change the action potential duration, or they may decrease the action potential duration. Class Ib drugs tend to be more specific for voltage gated Na channels than Ia. Lidocaine in particular is highly frequency dependent, in that it has more activity with increasing heart rates. This is because lidocaine selectively blocks Na channels in their open and inactive states and has little binding capability in the resting state. Class Ib agents are indicated for the treatment of ventricular tachycardia and symptomatic premature ventricular beats, and prevention of ventricular fibrillation. Class Ib ...
AmbroxolHCl is a potent inhibitor of the neuronal Na+ channels, inhibits TTX-resistant Na+ currents with IC50 of 35.2 uM and 22.5 μM for tonic and phasic block, inhibits TTX-sensitive Na+ currents with IC50 of 100 μM. Phase 3.
Although survival rates of breast, colon and prostate cancers are improving, deaths from these tumors frequently occur due to metastasis. Voltage-gated Na+ channels (VGSCs) are membrane proteins, which regulate membrane current and cellular migration during nervous system organogenesis. VGSCs are also expressed in fibroblasts, immune cells, glia and metastatic cancer cells. VGSCs regulate migration and invasion of breast, bowel and prostate cancer cells, suggesting that they may be novel anti-metastatic targets. We conducted a systematic review of clinical and preclinical studies testing the effects of VGSC-inhibiting drugs in cancer. 204 publications were identified, of which two human, two mouse and 20 in vitro publications were included. In the clinical studies, the effect of these drugs on survival and metastatic relapse is not clear. The 22 preclinical studies collectively suggest that several VGSC-inhibiting drugs inhibit cancer proliferation, migration and invasion. None of the human and only six
LQT3 mutations in the LQTS Registry will be studied using in vitro expression studies to determine whether ranolazine causes a decrease in late sodium current, slower recovery from inactivation and/or changes in time course of inactivation, ameliorating the causative functional effect of each individual mutation.. Individuals with select LQT3 mutations already studied in vitro will be invited to participate in a short term (2 day) study in the Clinical Research Center studying the effects of an oral dose of ranolazine on QTc duration and other ECG, echocardiogram and Holter-derived parameters.. The same individuals, as well as other individuals with the same mutation, will be invited to participate in a 6-month study involving ranolazine and matched placebo, to help evaluate the long-term effectiveness of ranolazine in the population. Periodic ECGs and 24-hour Holter recordings will be obtained for evaluation of QTc duration and other ECG and Holter-derived parameters. ...
Voltage-gated sodium channels play a critical role in the generation and conduction of action potentials - so important for electrical signalling by most excitable cells. Sodium channels are integral membrane proteins and are comprised of a large α subunit, which forms the voltage-sensitive and ion-selective pore, and smaller auxiliary β subunit(s) that can modulate the kinetics and voltage dependence of channel gating. Till 2007, 9 isoforms of the sodium-channel α subunit (Nav1.1- Nav1.9), each with a unique central and peripheral nervous system distribution had been identified. 4 closely related sodium channels (Nav 1.1, -1.2, -1.3, and -1.7) are encoded by a set of 4 genes (SCN1A, SCN2A, SCN3A, and SCN9A, respectively) located within a cluster on chromosome 2q24.3. Mutations in the genes encoding Nav1.1, -1.2, and -1.3 are responsible for a group of epilepsy syndromes with overlapping clinical characteristics but divergent clinical severity, mutation in the gene encoding Nav1.7 has a ...
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... SAN FRANCISCO Jan. 14 2014 /-... Neuropathic pain is estimated to affect more than 20 million people i...,First,Subjects,Dosed,in,Phase,1,Clinical,Study,of,NKTR-171,,A,New,Peripherally-Restricted,Sodium,Channel,Blocker,to,Treat,Neuropathic,Pain,medicine,advanced medical technology,medical laboratory technology,medical device technology,latest medical technology,Health
TY - JOUR. T1 - Sodium channels and pain. AU - Waxman, S. G.. AU - Dib-Hajj, S.. AU - Cummins, T. R.. AU - Black, J. A.. PY - 1999/7/6. Y1 - 1999/7/6. N2 - Although it is well established that hyperexcitability and/or increased baseline sensitivity of primary sensory neurons can lead to abnormal burst activity associated with pain, the underlying molecular mechanisms are not fully understood. Early studies demonstrated that, after injury to their axons, neurons can display changes in excitability, suggesting increased sodium channel expression, and, in fact, abnormal sodium channel accumulation has been observed at the lips of injured axons. We have used an ensemble of molecular, electrophysiological, and pharmacological techniques to ask: what types of sodium channels underlie hyperexcitability of primary sensory neurons after injury? Our studies demonstrate that multiple sodium channels, with distinct electrophysiological properties, are encoded by distinct mRNAs within small dorsal root ...
Definition of sodium channel blocking agent in the Legal Dictionary - by Free online English dictionary and encyclopedia. What is sodium channel blocking agent? Meaning of sodium channel blocking agent as a legal term. What does sodium channel blocking agent mean in law?
Previously cloned voltage-dependent sodium channels exhibit a high degree of homology to one another and appear to comprise a single multigene family. We have now isolated and characterized cDNAs from both human adult heart and fetal skeletal muscle that encode a sodium channel alpha subunit that exhibits only moderate primary structure identity with other sodium channels and is prominently expressed in both heart and uterus. The approximately 7.2-kilobase cDNA sequence, designated hNav2.1, predicts a 1682-amino acid protein that bears 52%, 49%, and 46% overall identity with sodium channels cloned from rat brain, skeletal muscle, and heart, respectively. Positively charged S4 segments are present in hNav2.1, but there are fewer basic residues in repeat domains 1, 3, and 4 than in other cloned sodium channels. The cloning of hNav2.1 provides evidence for greater evolutionary divergence among voltage-dependent sodium channels and suggests that other sodium channel gene subfamilies may exist. The ...
Modulates channel gating kinetics. Causes unique persistent sodium currents. Inactivates the sodium channel opening more slowly than the subunit beta-1. Its association with NFASC may target the sodium channels to the nodes of Ranvier of developing axons and retain these channels at the nodes in mature myelinated axons (By similarity).
Tonic and use-dependent effects of Gd3+ in different conditions, in which blocker potency is altered. Gray lines illustrate traces elicited in the presence of blocker scaled to the magnitude of control currents in the absence of blocker. (A) In 10 mM Ca2+, application of 0.2 μM Gd3+ reduced peak currents by about one half during the first pulse (I1, tonic block), but to a much greater extent at the second pulse (I2, use-dependent block). (B) With 10 mM Ba2+, both tonic and use-dependent block occurred at 25 nM Gd3+. (C) Although Ba2+ currents inactivated more rapidly in channels with the β3 subunit rather than with the β2a subunit (compare with B), tonic and use-dependent effects of Gd3+ were similar for both β subunits. (D) Exemplar Ca2+ currents through the EEQE mutant of the selectivity locus recorded with and without 2 μM Gd3+. (E) Dose-response curves for tonic effect of Gd3+ determined for different experimental conditions (indicated). Tonic block is described by relative magnitude of ...
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Buy Hainantoxin-III, a potent, selective TTX-sensitive voltage-gated Na+ channel blocker. Join researchers using high quality Hainantoxin-III from Abcam and…
TY - JOUR. T1 - Vascular smooth muscle contraction induced by Na+ channel activators, veratridine and batrachotoxin. AU - Shinjo(H), Masayoshi. AU - Toshio, Nakaki. AU - Yukari, Otsuka. AU - Nobuyuki, Sasakawa. AU - Ryuichi, Kato. PY - 1991/11/26. Y1 - 1991/11/26. N2 - The effects of the sodium channel activators veratridine and batrachotoxin on isolated rat aorta were investigated. Veratridine caused gradual contraction, independent of the presence of endolhelium, with an EC50 of 35 μM. Batrachotoxin (1 μM) also induced contraction. Both effects were completely inhibited by the sodium channel blocker tetrodotoxin (1 μM). The veratridine (60 μM)-induced contraction was inhibited by nifedipine (0.1 μM). In the absence of extracellular Ca2+, veratridine (60 μm) did not cause contraction. Sodium nitroprusside (80 nM), acetylcholine (10 μM) and isoproterenol (1 μM) caused relaxation of rings precontracted with veratridine (60 μM). An inhibitor of endothelium-derived relaxing factor (EDRF) ...
TY - JOUR. T1 - Isoform-specific lidocaine block of sodium channels explained by differences in gating. AU - Nuss, H. Bradley. AU - Kambouris, Nicholas. AU - Marbán, Eduardo. AU - Tomaselli, Gordon F.. AU - Balser, Jeffrey R.. PY - 2000/1/1. Y1 - 2000/1/1. N2 - When depolarized from typical resting membrane potentials (V(rest) ~ - 90 mV), cardiac sodium (Na) currents are more sensitive to local anesthetics than brain or skeletal muscle Na currents. When expressed in Xenopus oocytes, lidocaine block of hH1 (human cardiac) Na current greatly exceeded that of μ1 (rat skeletal muscle) at membrane potentials near V(rest), whereas hyperpolarization to -140 mV equalized block of the two isoforms. Because the isoform-specific tonic block roughly parallels the drug-free voltage dependence of channel availability, isoform differences in the voltage dependence of fast inactivation could underlie the differences in block. However, after a brief (50 ms) depolarizing pulse, recovery from lidocaine block is ...
Atherton, J. F., Gillies, A. J., Corbett, A. M., & Arbuthnott, G. W. (1998). The Relationship Between Voltage-Gated Sodium Channel Inactivation Firing Frequency in the Subthalamic Nucleus Projection Neuron. European Journal of Neuroscience, 10 (Supplement 10), 300 ...
Scorpion α-toxins LqhαIT, Lqh-2, and Lqh-3 are representatives of three groups of α-toxins that differ in their preference for insects and mammals. These α-insect, antimammalian, and α-like toxins bind to voltage-gated sodium channels and slow down channel inactivation. Sodium channel mutagenesis studies using various α-toxins have shown that they interact with receptor site 3, which is composed mainly of a short stretch of amino-acid residues between S3 and S4 of domain 4. Variation in this region results in marked differences between various subtypes of sodium channels with respect to their sensitivity to the three Lqh toxins. We incorporated the S3-S4 linker of domain 4 from hNaV1.2/hNaV1.1, hNaV1.3, hNaV1.6, and hNaV1.7 channels as well as individual point mutations into the rNaV1.4 skeletal muscle sodium channel. Our data show that the affinity of Lqh-3 and LqhαIT to sodium channels is markedly determined by an aspartate residue (Asp1428 in rNaV1.4); when mutated to glutamate, as is ...
WEDNESDAY, Nov. 27, 2019 (HealthDay News) -- Millions of Americans have the potentially dangerous irregular heartbeat known as atrial fibrillation.. Now, research suggests that being obese might undercut the effectiveness of certain drugs meant to treat AFib.. The new study followed more than 300 patients listed in the University of Illinois at Chicagos AFib Registry. Researchers found that a class of medicines called sodium channel blockers, which are often used to treat AFib, were less effective in obese patients. In fact, the recurrence rate for the heart arrhythmia was 30% for obese patients taking sodium channel blockers, compared with 6% for non-obese patients. That could be bad news for many patients, since obesity is a big risk factor for AFib, said a team led by Dr. Dawood Darbar, head of cardiology at the universitys College of Medicine. Still, obese patients may have a viable option: Darbars team found that another class of drugs, called potassium channel blockers, worked better in ...
Voltage-gated sodium channels are important targets for the development of pharmaceutical drugs, because mutations in different human sodium channel isoforms have causal relationships with a range of neurological and cardiovascular diseases. In this study, functional electrophysiological studies show that the prokaryotic sodium channel from Magnetococcus marinus (NavMs) binds and is inhibited by eukaryotic sodium channel blockers in a manner similar to the human Nav1.1 channel, despite millions of years of divergent evolution between the two types of channels. Crystal complexes of the NavMs pore with several brominated blocker compounds depict a common antagonist binding site in the cavity, adjacent to lipid-facing fenestrations proposed to be the portals for drug entry. In silico docking studies indicate the full extent of the blocker binding site, and electrophysiology studies of NavMs channels with mutations at adjacent residues validate the location. These results suggest that the NavMs ...
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The potassium-sparing diuretics are competitive antagonists that either compete with aldosterone for intracellular cytoplasmic receptor sites, or directly block sodium channels (specifically epithelial sodium channels (ENaC) by amiloride ). The
The octopus produces venom that contains tetrodotoxin, 5-hydroxytryptamine, hyaluronidase, tyramine, histamine, tryptamine, octopamine, taurine, acetylcholine, and dopamine. The major neurotoxin component of Blue-ringed Octopus venom was originally known as maculotoxin, but was later found to be identical to tetrodotoxin, a neurotoxin which is also found in pufferfish and cone snails. Tetrodotoxin blocks sodium channels, causing motor paralysis and sometimes respiratory arrest leading to cardiac arrest due to a lack of oxygen. The toxin is created by bacteria in the salivary glands of the octopus ...
The octopus produces venom containing tetrodotoxin, 5-hydroxytryptamine, hyaluronidase, tyramine, histamine, tryptamine, octopamine, taurine, acetylcholine, and dopamine. The major neurotoxin component of blue-ringed octopus venom was originally known as maculotoxin but was later found to be identical to tetrodotoxin, a neurotoxin also found in pufferfish and some poison dart frogs that is 10,000 times more toxic than cyanide. Tetrodotoxin blocks sodium channels, causing motor paralysis and respiratory arrest within minutes of exposure, leading to cardiac arrest due to a lack of oxygen. The toxin is produced by bacteria in the salivary glands of the octopus. Their venom can result in nausea, respiratory arrest, heart failure, severe and sometimes total paralysis and blindness and can lead to death within minutes if not treated. Death is usually from suffocation due to lack of oxygen to the brain ...
Voltage-gated sodium channels, which initiate action potentials in mammalian brain neurons, are modulated functionally by cAMP-dependent protein kinase A (PKA), resulting in reduced sodium current amplitude. Comparing brain and muscle sodium channels, we show that only the brain channel is modulated by PKA. The brain sodium channel I-II linker is both necessary and sufficient for PKA modulation, as shown by exchanging the I-II linker regions of the two channels. PKA consensus sites in the brain channel I-II linker were eliminated by deletion and site-specific mutagenesis. The mutant channels demonstrated decreased levels of phosphorylation when metabolically labeled in oocytes with [gamma-32P]-ATP, and they did not respond with a reduction in current magnitude after PKA induction. Modulation of the brain channel by PKA phosphorylation was mimicked by adding fixed negative charges at the PKA consensus sites, suggesting that the decrease in current was a direct result of the negative charge at one ...
Activyl® contains indoxacarb, an active ingredient with an innovative mode of action for flea control. Indoxacarb acts as a highly potent sodium channel blocker to impede insect nerve impulse transmission. Fleas stop feeding, become paralyzed and die. Activyl® is adulticidal, larvicidal and inhibits flea development in the environment. Features: ...
Fingerprint Dive into the research topics of Pathophysiological mechanisms underlying the adverse effects of calcium channel-blocking drugs in patients with chronic heart failure. Together they form a unique fingerprint. ...
1 . Platkiewicz J, Brette R (2011) Impact of fast sodium channel inactivation on spike threshold dynamics and synaptic integration. PLoS Comput Biol 7:e1001129-78 [PubMed] ...
Strupp, Michael; Quasthoff, Stefan; Mitrović, N. und Grafe, Peter (1992): Glutathione accelerates sodium channel inactivation in excised rat axonal membrane patches. In: Pflügers Archiv European Journal of Physiology, Vol. 421, Nr. 2-3: S. 283-285 [PDF, 349kB] ...
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Lubeluzole is widely reported as a multitarget drug acting at least on voltage-gated calcium and sodium channels. There are, however, only a very few studies reporting direct demonstration of sodium channel blockade by lubeluzole in neuronal and cardiac cells (Osikowska-Evers et al., 1995; Le Grand et al., 2003). The more complete study by Le Grand et al., (2003) described the block of sodium channels in single guinea pig ventricular myocytes. It was shown that lubeluzole produces a concentration-dependent tonic and use-dependent block of cardiac sodium channels in a manner similar to that of class I antiarrhythmic drugs, suggesting a greater affinity for inactivated than for resting channels. In the present study, we observed a similar local anesthetic-like effect of lubeluzole on human skeletal muscle sodium channels, and definitely demonstrated that the drug is a very potent blocker of inactivated sodium channels compared with resting channels. The IC50 values calculated for skeletal muscle ...
TY - JOUR. T1 - An emerging antiarrhythmic target. T2 - Late sodium current. AU - Banyasz, T.. AU - Szentandrássy, N.. AU - Magyar, J.. AU - Szabo, Z.. AU - Nánási, P. P.. AU - Chen-Izu, Ye. AU - Izu, Leighton T. PY - 2015/1/1. Y1 - 2015/1/1. N2 - The cardiac late sodium current (INa,L) has been in the focus of research in the recent decade. The first reports on the sustained component of voltage activated sodium current date back to the seventies, but early studies interpreted this tiny current as a product of a few channels that fail to inactivate, having neither physiologic nor pathologic implications. Recently, the cardiac INa,L has emerged as a potentially major arrhythmogenic mechanism in various heart diseases, attracting the attention of clinicians and researchers. Research activity on INa,L has exponentially increased since Ranolazine, an FDA-approved antianginal drug was shown to successfully suppress cardiac arrhythmias by inhibiting INa,L. This review aims to summarize and discuss ...
The present invention pertains to the field of compounds having sodium ion channel blocking activity, a process for preparing the same and use thereof. Previously described compounds targeting this activity have had issues including poor selectivity and/or potency, and in some cases, are not effective for some types of pain. The present invention addresses these issues by the provision of a compound represented by Chemical Formula 1 (shown) or a pharmaceutically acceptable salt thereof, which may be useful for the prevention or treatment of sodium channel blocker-related diseases such as acute pain, chronic pain, neuropathic pain, postoperative pain, migraine, arthralgia, neuropathy, nerve damage, diabetic neuropathy, neuropathic disease, epilepsy, arrhythmia, myotonia, ataxia, multiple sclerosis, irritable bowel syndrome, urinary incontinence, visceral pain, depression, erythralgia, or PEPD (paroxysmal extreme pain disorder).
AIMS: Sodium-channel blockers (SCBs) are associated with arrhythmia, but variability of cardiac electrical response remains unexplained. We sought to identify predictors of ajmaline-induced PR and QRS changes and Type I Brugada syndrome (BrS) electrocardiogram (ECG). METHODS AND RESULTS: In 1368 patients that underwent ajmaline infusion for suspected BrS, we performed measurements of 26 721 ECGs, dose-response mixed modelling and genotyping. We calculated polygenic risk scores (PRS) for PR interval (PRSPR), QRS duration (PRSQRS), and Brugada syndrome (PRSBrS) derived from published genome-wide association studies and used regression analysis to identify predictors of ajmaline dose related PR change (slope) and QRS slope. We derived and validated using bootstrapping a predictive model for ajmaline-induced Type I BrS ECG. Higher PRSPR, baseline PR, and female sex are associated with more pronounced PR slope, while PRSQRS and age are positively associated with QRS slope (P , 0.01 for all). PRSBrS, ...
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The cardiac sodium channel α subunit (RHI) is less sensitive to tetrodotoxin (TTX) and saxitoxin (STX) and more sensitive to cadmium than brain and skeletal muscle (µl) isoforms. An RHI mutant, with Tyr substituted for Cys at position 374 (as in µl) confers three properties of TTX-sensitive channels: (i) greater sensitivity to TTX (730-fold); (ii) lower sensitivity to cadmium (28-fold); and (iii) altered additional block by toxin upon repetitive stimulation. Thus, the primary determinant of high-affinity TTX-STX binding is a critical aromatic residue at position 374, and the interaction may take place possibly through an ionized hydrogen bond. This finding requires revision of the sodium channel pore structure that has been previously suggested by homology with the potassium channel.. ...
TY - JOUR. T1 - Voltage-dependent sodium channel function is regulated through membrane mechanics. AU - Shcherbatko, Anatoly. AU - Ono, Fumihito. AU - Mandel, Gail. AU - Brehm, Paul. PY - 1999/10. Y1 - 1999/10. N2 - Cut-open recordings from Xenopus oocytes expressing either nerve (PN1) or skeletal muscle (SkM1) Na+ channel α subunits revealed slow inactivation onset and recovery kinetics of inward current. In contrast, recordings using the macropatch configuration resulted in an immediate negative shift in the voltage-dependence of inactivation and activation, as well as time-dependent shifts in kinetics when compared to cut-open recordings. Specifically, a slow transition from predominantly slow onset and recovery to exclusively fast onset and fast recovery from inactivation occurred. The shift to fast inactivation was accelerated by patch excision and by agents that disrupted microtubule formation. Application of positive pressure to cell-attached macropatch electrodes prevented the shift in ...
Arrhythmias arise from breakdown of orderly action potential (AP) activation, propagation and recovery driven by interactive opening and closing of successive voltage-gated ion channels, in which one or more Na+ current components play critical parts. Early peak, Na+ currents (I Na) reflecting channel activation drive the AP upstroke central to cellular activation and its propagation. Sustained late Na+ currents (I Na-L) include contributions from a component with a delayed inactivation timecourse influencing AP duration (APD) and refractoriness, potentially causing pro-arrhythmic phenotypes. The magnitude of I Na-L can be analysed through overlaps or otherwise in the overall voltage dependences of the steady-state properties and kinetics of activation and inactivation of the Na+ conductance. This was useful in analysing repetitive firing associated with paramyotonia congenita in skeletal muscle. Similarly, genetic cardiac Na+ channel abnormalities increasing I Na-L are implicated in triggering
The present invention relates to a use of a carbamate compound of formula 1, or a pharmaceutically acceptable salt, solvate or hydrate thereof in the prevention or treatment of diseases associated with an increase in late sodium current.
This paper shows that persistent sodium current critically contributes to the subthreshold nonlinear dynamics of CA1 pyramidal neurons and promotes rapidly reversible conversion between place-cell and silent-cell in the hippocampus. A simple model built with realistic axo-somatic voltage-gated sodium channels in CA1 (Carter et al., 2012; Neuron 75, 1081-1093) demonstrates that the biophysics of persistent sodium current is sufficient to explain the synaptic amplification effects. A full model built previously (Grienberger et al., 2017; Nature Neuroscience, 20(3): 417-426) with detailed morphology, ion channel types and biophysical properties of CA1 place cells naturally reproduces the steep voltage dependence of synaptic responses ...
In the present work, we improve this model neuron by including morphological details. We take the morphological information from identified larval aCC abdominal dorsomedial motoneurons, which innervate the dorsal muscles [4]. A two-compartment version of the model is used to assess effects of changing sodium channel properties. This neuron model allows investigating the effect of sodium channel splice variants by varying half-activation and inactivation voltages and ratio of a persistent component to mimic changes observed in sodium channel current properties in seizure mutants. We further analyze the effect that changes in synaptic input observed in seizure mutants have on the output neuronal activity. ...
A novel potent epithelial sodium channel blocker seems to be a safe and well-tolerated therapy in patients with symptoms of mild-to-moderate dry eye disease compared with placebo.
In this study, we found that focal injection of the sodium channel blocker TTX into the injury site after a standardized spinal cord contusion dramatically reduced acute WM pathology. Specifically, TTX significantly attenuated the loss of large (≥5 μm)-diameter axons. The surviving axons in the TTX group demonstrated less axoplasmic pathology in comparison to those in the VEH group. The effectiveness of TTX appears to be in its ability to reduce axonal pathology per se as opposed to reducing injury-induced loss of glia or myelin pathology after SCI.. We previously showed that focal microinjection of TTX (0.15 nmol) into the lesion site significantly reduced WM loss at the injury epicenter chronically at 8 weeks after SCI (Teng and Wrathall, 1997). Morphometry analysis showed a three-fold sparing of WM in the TTX-treated group compared with VEH controls. This led us to hypothesize that TTX treatment was sparing axons. The finding that TTX treatment spared large axons is particularly ...
Voltage-gated sodium channels (VGSCs) are responsible for the initiation and propagation of action potentials in excitable cells. VGSCs in mammalian brain are heterotrimeric complexes of α and β subunits. Although β subunits were originally termed auxiliary, we now know that they are multifunctional …
Procaine. Molecular model of the local anaesthetic drug procaine (C13.H20.N2.O2), also known as novocaine. This drug acts as a sodium channel blocker. Atoms are represented as spheres and are colour-coded: carbon (grey), hydrogen (white), nitrogen (blue) and oxygen (red). Illustration. - Stock Image F017/0546
Shop Sodium channel and clathrin linker ELISA Kit, Recombinant Protein and Sodium channel and clathrin linker Antibody at MyBioSource. Custom ELISA Kit, Recombinant Protein and Antibody are available.
The ATP-binding cassette, subfamily G, isoform 2 protein (ABCG2) is a vital member of the ABC transporter superfamily, which has been involved in multidrug resistance (MDR) in cancer. Its diverse range of substrates includes many antineoplastic agents such as doxorubicin and mitoxantrone. ABCG2 expression has been significantly increased in some solid tumors and hematologic malignancies, which is correlated to poorer clinical outcomes. In addition, ABCG2 expression is a distinguishing feature of cancer stem cells, whereby this membranous transporter imparts resistance to the chemotherapeutic drugs. To enhance the chemosensitivity of cancer cells, attention has been focused on MDR modulators. In this study, we investigated the ability of sodium channel blocker, A-803467 to reverse ABCG2-mediated MDR. We found that A-803467 at non-toxic concentration could significantly increase the cellular sensitivity to ABCG2 substrates in drug-resistant cells overexpressing either wild-type or mutant ABCG2. ...
A cross-section of an axon, with an action potential (AP) moving from left to right. The AP has not yet reached point 4; the membrane there is still at rest. At point 3, positive sodium ions are moving in from the adjacent region, depolarizing the region; the sodium channels are about to open. Point 2 is at the peak of the AP; the sodium channels are open and ions are flowing into the axon. The AP has passed by point 1; the sodium channels are inactivated, and the membrane is hyperpolarized ...
Edited by H. Ronald Kaback, University of California, Los Angeles, CA, and approved June 8, 2004 (received for review April 15, 2004) ArticleFigures SIInfo Stratagene). CHO-K1 cells were grown in DMDM (Invitrogen) supplemented with 10% FBS
Enhanced Understanding of Ca2+ Modulation of the Human Cardiac Sodium Channel: Tight Binding of Calmodulin to the Inactivation ...
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Keller DI, Acharfi S, Delacrétaz E, Benammar N, Rotter M, Pfammatter JP, et al. A novel mutation in SCN5A, delQKP 1507-1509, causing long QT syndrome: role of Q1507 residue in sodium channel inactivation. J Mol Cell Cardiol. 2003;35(12):1513-21. ...
InterPro provides functional analysis of proteins by classifying them into families and predicting domains and important sites. We combine protein signatures from a number of member databases into a single searchable resource, capitalising on their individual strengths to produce a powerful integrated database and diagnostic tool.
At 9 days old, uZair is able to turn by himself. I placed him on his tummy in his cot. Few minutes later I came in the room and he was no longer on his tummy ...
Epithelial sodium channel blockers: amiloride and triamterene.. Calcium-sparing diuretics[edit]. The term "calcium-sparing ... Inhibition of Na+/K+ exchanger: Spironolactone inhibits aldosterone action, Amiloride inhibits epithelial sodium channels[16] 5 ... Aldosterone normally adds sodium channels in the principal cells of the collecting duct and late distal tubule of the nephron. ... This is large in comparison to normal renal sodium reabsorption which leaves only about 0.4% of filtered sodium in the urine. ...
... is a class 1a antiarrhythmic agent; a sodium channel blocker. It is an alkaloid and can be extracted from scotch ... thus is can be assumed that the enzyme catalyzes the formation of the quinolizidine skeleton in a channeled fashion . 7- ...
Yang C, Hao Z, Zhang L, Zeng L, Wen J (October 2015). "Sodium channel blockers for neuroprotection in multiple sclerosis". The ... Currently, there is insufficient evidence of an effect of sodium channel blockers for people with MS. MS is a clinically ... Medications that influence voltage-gated sodium ion channels are under investigation as a potential neuroprotective strategy ... Antibiodies against the Kir4.1 potassium channel may be related to MS. In 2008, vascular surgeon Paolo Zamboni suggested that ...
October 2015). "Sodium channel blockers for neuroprotection in multiple sclerosis". The Cochrane Database of Systematic Reviews ... Currently, there is insufficient evidence of an effect of sodium channel blockers for people with MS. There is growing ... Walking : dalfampridine (ampyra) is a broad-spectrum potassium channel blocker. It is approved by the FDA to treat walking ... Medications that influence voltage-gated sodium ion channels are under investigation as a potential neuroprotective strategy ...
Certain anticonvulsant medications that are classed as sodium channel blockers are now known to make seizures worse in most ... "SCN1A Patients Advised to Avoid Sodium Channel Blockers". Calgary, Canada: Intractable Childhood Epilepsy Alliance. Retrieved 1 ... Typically, a missense mutation in either the S5 or S6 segment of the sodium channel pore results in a loss of channel function ... A mutation in either of these two genes will cause an individual to develop dysfunctional sodium channels, which are crucial in ...
"Advances in Design and Development of Sodium Channel Blockers". Ion Channels and Their Inhibitors. pp. 79-115. doi:10.1007/978- ... Evenamide (INN) (developmental code names NW-3509, NW-3509A) is a selective voltage-gated sodium channel blocker, including ( ... 81-. ISBN 978-0-12-381293-3. Gupta SP (21 June 2011). Ion Channels and Their Inhibitors. Springer Science & Business Media. pp ...
Sodium channel blocker v t e. ... down electrical signaling in nerves by blocking sodium channels ...
... is a sodium channel blocker. It inhibits the firing of action potentials in neurons by binding to the voltage- ... TTX-s Na+ channels) and tetrodotoxin-resistant voltage-gated sodium channels (TTX-r Na+ channels). Tetrodotoxin inhibits TTX-s ... gated sodium channels in nerve cell membranes and blocking the passage of sodium ions (responsible for the rising phase of an ... for use in channel characterization and in fundamental studies of channel function. The prevalence of TTX-s Na+ channels in the ...
All of the peptides are voltage-gated sodium channel blockers. To date, Aps III is known to be the most potent peptide of all. ... "The insecticidal neurotoxin Aps III is an atypical knottin peptide that potently blocks insect voltage-gated sodium channels". ...
... is a sodium channel blocker.[28] It binds preferentially to voltage-gated sodium channels in their inactive ... Ion channel blockers. *Anticonvulsants (e.g., gabapentin, pregabalin, mirogabalin, carbamazepine, oxcarbazepine, lacosamide, ... and calcium channel blockers.[12] Carbamazepine also increases the metabolism of the hormones in birth control pills and can ... "Sodium valproate versus phenytoin monotherapy for epilepsy: an individual participant data review". The Cochrane Database of ...
Amiselimod, S1P modulator Amiloride (Midamor) - Midamor is a sodium channel blocker. It can stop sodium from entering the nerve ... Wulff H, Calabresi PA, Allie R, Yun S, Pennington M, Beeton C, Chandy KG (June 2003). "The voltage-gated Kv1.3 K(+) channel in ... Use of drugs to suppress myelin-reactive effector memory T cells by blocking voltage-gated Kv1.3 channels in these cells. ... "Potassium channel KIR4.1 as an immune target in multiple sclerosis". The New England Journal of Medicine. 367 (2): 115-23. doi: ...
ZTX is an extremely potent sodium channel blocker. It has been shown to block the voltage-gated sodium channels at picomolar ... A potent sodium-channel blocker". Proceedings of the National Academy of Sciences. 101 (13): 4346-4351. Bibcode:2004PNAS.. ... Voltage-gated sodium channel Saxitoxin Tetrodotoxin Yotsu-Yamashita, M.; Kim, Y. H.; Dudley, S. C.; Choudhary, G.; Pfahnl, A.; ...
It acts mainly as a sodium channel blocker. Today it is used therapeutically in some countries due to its sympatholytic, anti- ... consists of the direct reaction of the 4-aminobenzoic acid ethyl ester with 2-diethylaminoethanol in the presence of sodium ...
... is chemically similar to pyrazoline sodium channel blocker insecticides (SCBIs) discovered at Philips-Duphar in ... Salgado VL, Hayashi JH (December 2007). "Metaflumizone is a novel sodium channel blocker insecticide". Veterinary Parasitology ... Metaflumizone works by blocking sodium channels in target insects, resulting in flaccid paralysis. Metaflumizone blocks sodium ... channels by binding selectively to the slow-inactivated state, which is characteristic of the SCBIs. The toxin has been tested ...
"Inhibition of nociceptors by TRPV1-mediated entry of impermeant sodium channel blockers". Nature. 449 (7162): 607-610. doi: ... channel activity confers resistance to epileptic seizures". Neuron. 74 (4): 719-730. doi:10.1016/j.neuron.2012.03.032. ISSN ... "for structural and mechanistic studies of ion channels" 2004: Linda Buck (faculty member 1991-2001) "for...discoveries of ... and nonhuman primates Ion channel physiology Neurobiology of Behavior Neurodevelopmental disorders, such as Rett Syndrome and ...
... is a voltage-gated sodium channel (VGSC) blocker. It is a selective blocker of the inactivated state of VGSCs, ... preferentially inhibiting persistent sodium current. It has been proposed that cenobamate additionally enhances presynaptic ...
It is classified by the Vaughan Williams classification system as class Ia; thus it is a sodium channel blocker of ... "Dual actions of procainamide on batrachotoxin-activated sodium channels: open channel block and prevention of inactivation". ... It induces rapid block of the batrachotoxin (BTX)-activated sodium channels of the heart muscle and acts as antagonist to long- ... Procainamide is also known to induce a voltage-dependent open channel block on the batrachotoxin (BTX)-activated sodium ...
... is a sodium channel blocker. It binds preferentially to voltage-gated sodium channels in their inactive ... and calcium channel blockers. Carbamazepine also increases the metabolism of the hormones in birth control pills and can reduce ... Nevitt SJ, Marson AG, Weston J, Tudur Smith C (August 2018). "Sodium valproate versus phenytoin monotherapy for epilepsy: an ...
Sodium channel blockers directly inhibit the entry of sodium into the sodium channels. Triamterene is commonly prepared in ... Triamterene directly blocks the epithelial sodium channel (ENaC) on the lumen side of the kidney collecting tubule. Other ... Common side effects may include a depletion of sodium, folic acid and calcium, nausea, vomiting, diarrhea, headache, dizziness ... diuretics cause a decrease in the sodium concentration of the forming urine due to the entry of sodium into the cell via the ...
Remacemide: a low affinity antagonist also a sodium-channel blocker. Aptiganel (Cerestat, CNS-1102): binds the Mg2+ binding ... "Antiepileptic drugs and agents that inhibit voltage-gated sodium channels prevent NMDA antagonist neurotoxicity". Molecular ... An NMDA receptor that has glycine and glutamate bound to it and has an open ion channel is called "activated." Chemicals that ... Agmatine: Blocks NMDA receptors and other cation ligand-gated channels. Can also potentiate opioid analgesia. Chloroform: an ...
... acts as a blocker of voltage-gated sodium channels. Inhibition of the Nav1.5 channel is specifically involved in its ... Rapid Interpretation of EKG's 6th Ed., Dubin de Lera Ruiz M, Kraus RL (2015). "Voltage-Gated Sodium Channels: Structure, ... Hugues Abriel (1 September 2015). Cardiac Sodium Channel Disorders, An Issue of Cardiac Electrophysiology Clinics, E-Book. ... The effect of quinidine on the ion channels is to prolong the cardiac action potential, thereby prolonging the QT interval on ...
Unmasking persistent sodium current in presence of calcium channel blockers has been well studied. It is likely that calcium ... channel blockers will block voltage and ligand gated calcium channels, thereby affecting calcium-activated potassium channel in ... As usual, these Ca-ions will activate calcium dependent potassium channels and PDS will terminate. This is the case that ... Finally, the Na/K pump and calcium activated potassium channel might play a role in terminating PDS. Paradoxically, there might ...
Site 1 binds the sodium channel blockers tetrodotoxin and saxitoxin. Site 2 binds lipid-soluble sodium channel activators such ... Invertebrates possess two Nav channels (Nav1 and Nav2), whereas vertebrate Nav channels are of the Nav1 family. Sodium-channel ... which slow sodium channel inactivation. Site 4 binds beta-scorpion toxins, which affect sodium channel activation. Site 5 binds ... "A new neurotoxin receptor site on sodium channels is identified by a conotoxin that affects sodium channel inactivation in ...
It acts as a small-molecule Nav1.7 and Nav1.8 voltage-gated sodium channel blocker. Funapide is being evaluated in humans in ... "Recent progress in sodium channel modulators for pain". Bioorganic & Medicinal Chemistry Letters. 24 (16): 3690-9. doi:10.1016/ ...
Arothron mappa contains tetrodotoxin - an extremely toxic sodium channel blocker which protects it from predators. A. mappa do ...
The poison, a sodium channel blocker, paralyzes the muscles while the victim stays fully conscious; the poisoned victim is ... "Interaction between voltage-gated sodium channels and the neurotoxin, tetrodotoxin". Channels. 2 (6): 407-12. doi:10.4161/chan. ... The original name of TTX was "taricatoxin" … TTX selectively interacts with elements of the sodium channel … TTX has been ... it acts via interaction with components of the sodium channels in the cell membranes of those cells. It does not cross the ...
Structure--activity relationships of hainantoxin-IV and structure determination of active and inactive sodium channel blockers ... and HNTX-V are thought to bind to site 1 of voltage-dependent sodium channels, similar to TTX, and thereby block the channel ... voltage-gated sodium channels (VGSCs). Voltage-gated Ca2+ channels (VGCCs), tetrodotoxin-resistant (TTX-R) VGSCs and rectifier- ... Inhibition of sodium channels in rat dorsal root ganglion neurons by Hainantoxin-IV, a novel spider toxin. Sheng Wu Hua Xue Yu ...
... voltage-gated sodium channel blocker. One of the most potent known natural toxins, it acts on the voltage-gated sodium channels ... "Protection against nerve toxicity by monoclonal antibodies to the sodium channel blocker tetrodotoxin". Journal of Clinical ... Saxitoxin binds reversibly to the sodium channel. It binds directly in the pore of the channel protein, occluding the opening, ... Opening of the voltage-gated sodium channel occurs when there is a change in voltage or some ligand binds in the right way. It ...
But if the γ2 is expressed with α1 and β2 the sensitivity is low and channel conductance is high.[7] γ2 subunit has to be ... Bromide compounds (e.g., lithium bromide, potassium bromide, sodium bromide). *Carbamazepine. *Chloralose ... Upon binding, it triggers the GABAA receptor to open its chloride channel to allow chloride ions into the neuron, making the ... The channel conductance is not higher in the presence of benzodiazepine and GABA than the conductance with the presence of only ...
鈉離子通道阻滯劑(英語:Sodium channel blocker) (SCB) ... 腎上腺素受體拮抗劑 (α(英語:Alpha blocker) (1(英語:Alpha-1 blocker) ... 鉀離子通道阻滯劑(英語:Potassium channel blocker) (PCB
States in which ginger is exported follow the marketing channels of vegetable marketing in India, and the steps are similar to ... water channels are made 60-80 ft apart to irrigate the crop.[29] ... Blockers. *α-Spinasterol (Vernonia tweediana). *AMG-517. * ...
Calcium Channel Blockers. CCB. 降血壓. 鈣質. Calcium. -. 骨骼細胞營養所需 ... Sodium Bicarbonate. 小蘇打(Baking soda). 食物添加劑 ... Beta Blockers. β-Blockers. 控制心率、降血壓. 胰高血糖素. Glucagon. -. 升血糖 ... Better Health
Zühlke RD, Bouron A, Soldatov NM, Reuter H (May 1998). "Ca2+ channel sensitivity towards the blocker isradipine is affected by ... calcium channel activity. • metal ion binding. • voltage-gated ion channel activity. • ion channel activity. • protein binding ... voltage-gated calcium channel activity involved in cardiac muscle cell action potential. • high voltage-gated calcium channel ... When calcium ions bind to calmodulin, which in turn binds to a Cav1.2 channel, it allows the Cav1.2 channels within a cluster ...
Epithelial sodium channel blockers: amiloride and triamterene.. Calcium-sparing diureticsEdit. The term "calcium-sparing ... Inhibition of Na+/K+ exchanger: Spironolactone inhibits aldosterone action, Amiloride inhibits epithelial sodium channels[17]. ... Aldosterone normally adds sodium channels in the principal cells of the collecting duct and late distal tubule of the nephron. ... This is large in comparison to normal renal sodium reabsorption which leaves only about 0.4% of filtered sodium in the urine. ...
Some "triple-action" pepper sprays also contain "tear gas" (CS gas), which can be neutralized with sodium metabisulfite ( ... Blockers. *α-Spinasterol (Vernonia tweediana). *AMG-517. *Asivatrep. *BCTC. *Cannabigerol (cannabis). *Cannabigerolic acid ( ... See also: Receptor/signaling modulators • Ion channel modulators. Retrieved from "https://en.wikipedia.org/w/index.php?title= ...
Ion channel. modulators. Calcium blockers. *Gabapentin. *Gabapentin enacarbil. *Mirogabalin. *Pregabalin. *Ziconotide. Sodium ...
L-Type calcium channel blockers (e.g., dihydropyridines: nifedipine). *Nebivolol (beta blocker) ... Reconstitution with sodium chloride should be avoided due to formation of precipitates. Intravenous solutions of pentamidine ...
... or epithelial sodium channel blockers such as amiloride can be used to decrease urinary wasting of potassium.[1] ... This symporter is a channel responsible for the transport of multiple electrolytes such as sodium, chloride, calcium, magnesium ... channel (ClC-Kb), and the Na+/K+-ATPase. Indicated also are the recently identified magnesium channel TRPM6 in the apical ... Sodium chloride (NaCl) enters the cell via the apical thiazide-sensitive NCC and leaves the cell through the basolateral Cl− ...
Channel. modulators. Sodium blockers. *Hydantoins: Ethotoin. *Fosphenytoin. *Mephenytoin. *Phenytoin#; Ureides: ... Ion channel blockers. *Anticonvulsants (e.g., gabapentin, pregabalin, carbamazepine, oxcarbazepine, lacosamide, lamotrigine) ... Lamotrigine is a member of the sodium channel blocking class of antiepileptic drugs.[60] This may suppress the release of ... It is a triazine derivate that inhibits voltage-sensitive sodium channels, leading to stabilization of neuronal membranes. It ...
Potassium channel blockers. *Prolactin releasers. *Ureas. Hidden categories: *CS1 Ukrainian-language sources (uk) ... The cause is thought to be blockade of hERG voltage-gated potassium channels.[41][42] The risks are dose-dependent, and appear ... the voltage-gated potassium channel KCNH2 gene (hERG/Kv11.1), and the α1D-adrenoceptor ADRA1D gene.[58] ... Sodium. VGSCs. Blockers. *Antianginals: Ranolazine. *Antiarrhythmics (class I): Ajmaline. *Aprindine. *Disopyramide. * ...
Channel. modulators. Sodium blockers. *Hydantoins: Ethotoin. *Fosphenytoin. *Mephenytoin. *Phenytoin#; Ureides: ...
They are particularly well known in pharmacology as L-type calcium channel blockers, used in the treatment of hypertension. ... Compared with certain other L-type calcium channel blockers (for example those of the phenylalkylamine class such as verapamil ... The pharmaceutical drug finerenone is also a dihydrophyridine derivative, but does not act as a calcium channel blocker but as ... Dihydropyridine class L-type calcium channel blockers include, in alphabetical order (brand names vary in different countries ...
InChI=1S/C26H32N4O4S/c1-20(2)30(16-10-11-17-34-19-24(31)29-35(3,32)33)23-18-27-25(21-12-6-4-7-13-21)26(28-23)22-14-8-5-9-15-22/h4-9,12-15,18,20H,10-11,16-17,19H2,1-3H3,(H,29,31) ...
Sodium blockers. *Carbamazepine. *Lacosamide. *Local anesthetics (e.g., cocaine, lidocaine). *Mexiletine. *Nefopam ... Ion channel. modulators. Calcium blockers. *Alcohol (ethanol). *Gabapentin. *Gabapentin enacarbil. *Mirogabalin. *Pregabalin ...
Such plans should also include progressive increases in monitoring, as well as a level at which a serum sodium level is drawn. ... June 1999). "Urinary excretion of aquaporin-2 water channel differentiates psychogenic polydipsia from central diabetes ... a sympatholytic beta blocker Vasopressin receptor antagonists, such as conivaptan Acetazolamide, a carbonic anhydrase inhibitor ... First, base-line weights must be established and correlated to serum sodium levels. Weight will normally fluctuate during the ...
Ion channel blockers. *Anticonvulsants (e.g., gabapentin, pregabalin, carbamazepine, oxcarbazepine, lacosamide, lamotrigine) ... and sodium channels in the cardiac muscle, leading to decreased cardiac conduction and cardiotoxicity. Selectivity of ...
Some novel and investigational analgesics include subtype-selective voltage-gated sodium channel blockers such as funapide and ... N-type calcium-channel blocker.. Intrathecal.. Protein binding = 50%; half-life = 2.9-6.5 hours; excretion = urine (,1%).[122] ... Comes in free acid and sodium salt form, sodium salt is the form used in human medicine; practically insoluble in water (free ... Comes in free acid and sodium form; practically insoluble in water in free form, freely soluble in water (sodium salt), fairly ...
It acts mainly as a sodium channel blocker.[2] Today it is used therapeutically in some countries due to its sympatholytic, ... consists of the direct reaction of the 4-aminobenzoic acid ethyl ester with 2-diethylaminoethanol in the presence of sodium ...
Uncompetitive NMDA receptor antagonists, or channel blockers, enter the channel of the NMDA receptor after it has been ... Lucas DR, Newhouse JP (August 1957). "The toxic effect of sodium L-glutamate on the inner layers of the retina". AMA Archives ... Memantine is an example of an uncompetitive channel blocker of the NMDA receptor, with a relatively rapid off-rate and low ... Most NMDAR antagonists are uncompetitive or noncompetitive blockers of the channel pore or are antagonists of the glycine co- ...
These drugs include statins, HIV protease inhibitors, many calcium channel blockers, lidocaine, the benzodiazepines, and ... Sodium ferulate (Angelica sinensis, Ligusticum wallichii). *Suramin. *TC-P 262. *Tetramethylpyrazine (ligustrazine) (Ligusticum ... The drug binds to glutamate-gated chloride channels (GluCls) in the membranes of invertebrate nerve and muscle cells, causing ... Yates DM, Wolstenholme AJ (August 2004). "An ivermectin-sensitive glutamate-gated chloride channel subunit from Dirofilaria ...
Ion channel. modulators. Calcium blockers. *Gabapentin. *Gabapentin enacarbil. *Pregabalin. *Ziconotide. Sodium blockers. * ...
Calcium channel blockers. *renin-angiotensin system *ACE inhibitors. *Angiotensin II receptor antagonists ... blockers of signal transduction). To avoid these connotations for recently developed (against specific molecular or genetic ...
Calcium channel blockers. *renin-angiotensin system *ACE inhibitors. *Angiotensin II receptor antagonists ... Saline (water and sodium chloride solution). Uncommon or discontinued[edit]. *Cafaminol. See also[edit]. *Nasal spray ...
... coupled with the effect of blocking the channel from rapid desensitization. In addition there is a synergistic effect with ... UBP-302; Negative allosteric modulators: Barbiturates (e.g., pentobarbital, sodium thiopental). *Enflurane ... Putrescine; Uncompetitive pore blockers (mostly dizocilpine site): 2-MDP. *3-HO-PCP ...
Ion channel modulators. Calcium. VDCCs. Blockers. *L-type-selective: Dihydropyridines: Amlodipine. *Aranidipine ... Sodium glucose transporter (SGLT2) inhibitors/"gliflozins". *Canagliflozin. *Dapagliflozin. *Empagliflozin. *Ipragliflozin. * ...
Ion channel. modulators. Calcium blockers. *Gabapentin. *Gabapentin enacarbil. *Pregabalin. *Ziconotide. Sodium blockers. * ... Salicylate is also produced as a result of exposure to bismuth subsalicylate, methyl salicylate, and sodium salicylate.[117][ ... In 1853, chemist Charles Frédéric Gerhardt treated sodium salicylate with acetyl chloride to produce acetylsalicylic acid for ... sodium bicarbonate, and dialysis.[116] The diagnosis of poisoning usually involves measurement of plasma salicylate, the active ...
an activator of a subfamily of transient receptor potential canonical (TRPC) cation channels, TRPC3/6/7. ... Blockers. *α-Spinasterol (Vernonia tweediana). *AMG-517. *Asivatrep. *BCTC. *Cannabigerol (cannabis). *Cannabigerolic acid ( ...
Ion channel function[edit]. Each AMPAR has four sites to which an agonist (such as glutamate) can bind, one for each subunit.[5 ... If an AMPAR lacks a GluA2 subunit, then it will be permeable to sodium, potassium, and calcium. The presence of a GluA2 subunit ... Putrescine; Uncompetitive pore blockers (mostly dizocilpine site): 2-MDP. *3-HO-PCP ... The channel opens when two sites are occupied,[17] and increases its current as more binding sites are occupied.[18] Once open ...
Sodium channel blockers are drugs which impair the conduction of sodium ions (Na+) through sodium channels.[1] ... Sodium channel opener. References[edit]. *^ Sodium+Channel+Blockers at the US National Library of Medicine Medical Subject ... sodium channels.[3]. Antiarrhythmic[edit]. Sodium channel blockers are used in the treatment of cardiac arrhythmia. They are ... "Sodium channel blockers for cystic fibrosis".. *^ Dick IE, Brochu RM, Purohit Y, Kaczorowski GJ, Martin WJ, Priest BT (April ...
Sodium channel blockers. The firing of an action potential by an axon is accomplished through sodium channels. Each sodium ... Sodium Channel Blockers. Sodium channel blockade is the most common and best-characterized mechanism of currently available ... Calcium channel blockers. Calcium channels exist in 3 known forms in the human brain: L, N, and T. These channels are small and ... The main groups include sodium channel blockers, calcium current inhibitors, gamma-aminobutyric acid (GABA) enhancers, ...
An epithelial sodium channel blocker is a sodium channel blocker that is selective for the epithelial sodium channel. An ... Sagnella GA, Swift PA (2006). "The renal epithelial sodium channel: genetic heterogeneity and implications for the treatment of ...
a zip file of the full study records in XML for all studies in the search results table (max 10000 ...
WebMD provides information about interactions between Stavzor Oral and sodium-channel-blocker-potassium-channel-blocker- ... Lacosamide/Sodium Channel Blockers; Potassium Channel Blockers Interactions. This information is generalized and not intended ...
A sodium channel blocker is a medication that is used to correct abnormal heart rhythms by affecting the electrical impulses ... A sodium channel blocker is a medication that is categorized as a Class I antiarrhythmic drug. This means that it works to ... Typically, a sodium channel blocker may cause dizziness, nausea, and vomiting, along with diarrhea or constipation. Loss of ... People taking a sodium channel blocker may experience some side effects, which should be reported to the prescribing physician ...
Efficacy Study of Sodium Channel Blocker in LQT3 Patients. This study is currently recruiting participants. See Contacts and ... The purpose of this study is to determine whether late sodium channel blockade might be effective in shortening the QTc ... In vitro studies of specific mutation show no effect of ranolazine on late sodium current kinetics or show repolarization ... Ranolazine shortens repolarization in patients with sustained inward sodium current due to type-3 long-QT syndrome. J ...
... which may be useful for the prevention or treatment of sodium channel blocker-related diseases such as acute pain, chronic pain ... The present invention pertains to the field of compounds having sodium ion channel blocking activity, a process for preparing ... NZ742069A - Sodium channel blocker - Google Patents. Sodium channel blocker Info. Publication number. NZ742069A. NZ742069A ... Benzaepinones as sodium channel blockers WO2008075353A1 (en) * 2006-12-19. 2008-06-26. Pharmos Corporation. Sulfonamide ...
Selective sodium channel blockers in trigeminal neuralgia Selective sodium channel blockers in trigeminal neuralgia. Research ... Selective sodium channel blockers in trigeminal neuralgia. / Jensen, Troels Staehelin.. In: Lancet Neurology, Vol. 16, No. 4, ... "Selective sodium channel blockers in trigeminal neuralgia". Lancet Neurology. 2017, 16(4). 255-256. Available: 10.1016/S1474- ... Selective sodium channel blockers in trigeminal neuralgia. Lancet Neurology. 2017 Apr;16(4):255-256. Available from, DOI: ...
The National Center for Biomedical Ontology was founded as one of the National Centers for Biomedical Computing, supported by the NHGRI, the NHLBI, and the NIH Common Fund under grant U54-HG004028 ...
A-803467, a sodium channel blocker, reverses ABCG2-mediated MDR. [abstract]. In: Proceedings of the 105th Annual Meeting of the ... In this study, we investigated the ability of sodium channel blocker, A-803467 to reverse ABCG2-mediated MDR. We found that A- ... Abstract 1967: A-803467, a sodium channel blocker, reverses ABCG2-mediated MDR. Nagaraju Anreddy ... Abstract 1967: A-803467, a sodium channel blocker, reverses ABCG2-mediated MDR ...
To further explore the roles of NMDA receptors and sodium channels in these effects, MK-801, phenytoin (sodium channel blocker ... Chronic exposure to NMDA receptor and sodium channel blockers during development in monkeys and rats: long-term effects on ... The effects of chronic administration of MK-801 (NMDA-receptor antagonist) and remacemide (sodium channel blocker) on monkey ... In the rat, blockade of sodium channels was well tolerated but blockade of NMDA receptors had significant and long-term ( ...
Effects of the Sodium Channel Blocker Tetrodotoxin on Acute White Matter Pathology After Experimental Contusive Spinal Cord ... Effects of the Sodium Channel Blocker Tetrodotoxin on Acute White Matter Pathology After Experimental Contusive Spinal Cord ... Effects of the Sodium Channel Blocker Tetrodotoxin on Acute White Matter Pathology After Experimental Contusive Spinal Cord ... Effects of the Sodium Channel Blocker Tetrodotoxin on Acute White Matter Pathology After Experimental Contusive Spinal Cord ...
Interaction between selected sodium and potassium channel blockers in guinea pig papillary muscle.. L Wang, N Chiamvimonvat and ... Interaction between selected sodium and potassium channel blockers in guinea pig papillary muscle.. L Wang, N Chiamvimonvat and ... Interaction between selected sodium and potassium channel blockers in guinea pig papillary muscle.. L Wang, N Chiamvimonvat and ... Interaction between selected sodium and potassium channel blockers in guinea pig papillary muscle. ...
NVP-QBE170: an inhaled blocker of the epithelial sodium channel with a reduced potential to induce hyperkalaemia.. [K J Coote, ... Inhaled amiloride, a blocker of the epithelial sodium channel (ENaC), enhances mucociliary clearance (MCC) in cystic fibrosis ( ... The in vitro potency and duration of action of NVP-QBE170 were compared with amiloride and a newer ENaC blocker, P552-02, in ... Inhaled ENaC blockers with a reduced potential to induce hyperkalaemia provide a therapeutic strategy to improve mucosal ...
Sodium,Channel,Blocker,to,Treat,Neuropathic,Pain,medicine,advanced medical technology,medical laboratory technology,medical ... A peripherally-restricted sodium channel blocker with good efficacy and low CNS side effects would be an important advance in ... The sodium channel blocker lidocaine is known to be effective in addressing peripheral nerve pain, however it is not selective ... "While conventional sodium channel blockers have demonstrated efficacy in addressing peripheral nerve pain, the CNS-mediated ...
... showed attenuation of ER in inferior or lateral leads by sodium channel blocker infusion (94%). Comparing to patients in BS ... provocative tests with sodium-channel blockers were performed in all ERS and BS patients. ... early repolarization in inferior or lateral leads in both ERS and BS patients were attenuated by sodium channel blocker ... of Idiopathic Ventricular Fibrillation with Early Repolarization and Response of Early Repolarization to Sodium Channel Blocker ...
Vinpocetine Is a Potent Blocker of Rat NaV1.8 Tetrodotoxin-Resistant Sodium Channels. Xiaoping Zhou, Xiao-Wei Dong, James Crona ... Vinpocetine Is a Potent Blocker of Rat NaV1.8 Tetrodotoxin-Resistant Sodium Channels. Xiaoping Zhou, Xiao-Wei Dong, James Crona ... Vinpocetine Is a Potent Blocker of Rat NaV1.8 Tetrodotoxin-Resistant Sodium Channels. Xiaoping Zhou, Xiao-Wei Dong, James Crona ... These properties are reminiscent of several other known sodium channel blockers and suggested that vinpocetine may exhibit ...
3 MΩ for heterologously expressed sodium channels and to ∼1-2 MΩ for DRG sodium channels. To reduce voltage errors, low-sodium ... Sodium channels are important players for pain processing, especially Nav1.7 and Nav1.8 channels. The two subtypes of sodium ... Due to the activity on the recombinant sodium channels, it is expected that WB4101 will be able to inhibit sodium channels in ... Identification of WB4101 as an Inhibitor of Voltage-Gated Sodium Channels.. It is well known that voltage-gated sodium channels ...
... although the properties of naturally occurring toxin blockers suggest that subtype-specific blockers of sodium channels could ... although the properties of naturally occurring toxin blockers suggest that subtype-specific blockers of sodium channels could ... Voltage-Gated Sodium Channel Blockers; Target Validation and Therapeutic Potential. Author(s): John N. Wood, James Boorman. ... It has long been known that sodium channel blockers are anaesthetics as well as powerful analgesics when delivered at low ...
Site-1 Sodium Channel Blockers as Local Anesthetics: Will Neosaxitoxin Supplant the Need for Continuous Nerve Blocks?. ... Site-1 Sodium Channel Blockers as Local Anesthetics: Will Neosaxitoxin Supplant the Need for Continuous Nerve Blocks? ... Site-1 Sodium Channel Blockers as Local Anesthetics: Will Neosaxitoxin Supplant the Need for Continuous Nerve Blocks? ... Laura A. Lahaye, John F. Butterworth; Site-1 Sodium Channel Blockers as Local Anesthetics: Will Neosaxitoxin Supplant the Need ...
Clinical utility of nonselective sodium channel blockers is limited due to serious adverse drug effects. Here, we present the ... 3-Oxoisoindoline-1-carboxamides: Potent, State-Dependent Blockers of Voltage-Gated Sodium Channel Na(V)1.7 with Efficacy in Rat ... The voltage-gated sodium channel Na(V)1.7 is believed to be a critical mediator of pain sensation based on clinical genetic ...
P-321, a Novel Long-Acting Epithelial Sodium Channel (ENaC) Blocker for the Treatment of Dry Eye Disease ... P-321, a Novel Long-Acting Epithelial Sodium Channel (ENaC) Blocker for the Treatment of Dry Eye Disease ... a Novel Long-Acting Epithelial Sodium Channel (ENaC) Blocker for the Treatment of Dry Eye Disease. Invest. Ophthalmol. Vis. Sci ... Keywords: 486 cornea: tears/tear film/dry eye • 475 conjunctivitis • 569 ion channels ...
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Download PDF Safety and efficacy of a Nav1.7 selective sodium channel blocker in patients with trigeminal neuralgia: a double- ... Safety and efficacy of a Nav1.7 selective sodium channel blocker in patients with trigeminal neuralgia: a double-blind, placebo ... Background: Current standard of care for trigeminal neuralgia is treatment with the sodium channel blockers carbamazepine and ... Background: Current standard of care for trigeminal neuralgia is treatment with the sodium channel blockers carbamazepine and ...
Effects of the sodium channel blocker amitriptyline on the spontaneous and stimulus-evoked activity of corneal cold-sensitive ... Effects of the sodium channel blocker amitriptyline on the spontaneous and stimulus-evoked activity of corneal cold-sensitive ... Takayoshi Masuoka, Carlos Belmonte, Juana Gallar; Effects of the sodium channel blocker amitriptyline on the spontaneous and ... Conclusions: Na+-channel blocker amitriptyline attenuates the spontaneous activity and cooling response of cold nerve terminals ...
HMR 1883 sodium salt , HMR1098 , CAS [ 261717-22-0] - [158751-64-5] , Axon 1757 , Axon Ligand™ with >98% purity available from ... Kv1.3 Channel blocker 42 Kv1.3 potassium channel blocker €125.00 2064 Glibenclamide potassium salt KATP channel blocker; ... Kv11.1 (hERG) channel blocker €85.00 2243 AVE 0118 hydrochloride Potassium channel blocker (Kv1.5 (IKur), Kv4.3 (Ito), Kir3.4 ( ... KCNQ channel and M-current blocker €90.00 2436 ML 297 First potent and selective activator of the GIRK potassium channel €95.00 ...
GYY4137 and Sodium Hydrogen Sulfide Relaxations Are Inhibited by L-Cysteine and KV7 Channel Blockers in Rat Small Mesenteric ... Blockers of large-conductance calcium-activated (BKCa) and voltage-gated type 7 (KV7) potassium channels also inhibited GYY4137 ... concentration and potassium channel blockers compared with Na2S. The perspective is that the rate of release of sulfides plays ... GYY4137 and Sodium Hydrogen Sulfide Relaxations Are Inhib... ... are also involved Na2S relaxation while potassium channel ...
  • This is because lidocaine selectively blocks Na channels in their open and inactive states and has little binding capability in the resting state. (wikipedia.org)
  • The sodium channel blocker lidocaine is known to be effective in addressing peripheral nerve pain, however it is not selective and blocks both normal and abnormal nerve conduction. (bio-medicine.org)
  • Surprisingly, lidocaine is a potential candidate because, besides its sodium channel blocking effects, it also activates TRPV1 channels with a much lower potency than capsaicin but nevertheless at clinically relevant concentrations. (asahq.org)
  • These results suggest that ketamine is less effective than lidocaine-like local anesthetics in stabilizing the inactivated channel state. (nih.gov)
  • Thus, there is concern primarily about use of epinephrine, lidocaine, and beta-blockers in the setting of acute cocaine toxicity. (medscape.com)
  • Previously, mutation F(4i15)A in a cockroach sodium channel, BgNav1-1a, has been shown to reduce the action of lidocaine, a LA, but not the action of SCBIs. (duke.edu)
  • F(4i15)Y and V(4i18)I mutations also reduced the use-dependent block of sodium current by lidocaine. (duke.edu)
  • Inhaled amiloride, a blocker of the epithelial sodium channel (ENaC), enhances mucociliary clearance (MCC) in cystic fibrosis (CF) patients. (sigmaaldrich.com)
  • The in vitro potency and duration of action of NVP-QBE170 were compared with amiloride and a newer ENaC blocker, P552-02, in primary human bronchial epithelial cells (HBECs) by short-circuit current. (sigmaaldrich.com)
  • One of the best known potassium sparing diuretics - amiloride - blocks the action of so-called epithelial sodium channels (ENaCs), which have diverse physiological functions. (phys.org)
  • This provides the first optical tool for an amiloride-sensitive ion channel . (phys.org)
  • Background and Purpose Inhaled amiloride, a blocker of the epithelial sodium channel (ENaC), enhances mucociliary clearance (MCC) in cystic fibrosis (CF) patients. (elsevier.com)
  • Amiloride-sensitive Na+ channels contribute to regulatory volume increases in human glioma cells. (biomedsearch.com)
  • Cannabidiol has been shown to cause inhibitory effects on sodium currents. (wikipedia.org)
  • The current literature suggests that cannabidiol inhibits sodium currents primarily through altering the biophysical properties of cell membrane, promoting the inactivated conformation of * sodium channels . (wikipedia.org)
  • Agents that produce selective electrophysiologic effects were chosen, including low concentrations of barium chloride (BaCl2), which selectively blocks the inwardly rectifying potassium current without effects on other repolarizing or depolarizing currents, O-demethyl-encainide (ODME), which blocks the activated sodium channel with slow onset/offset kinetics, and mexiletine, which preferentially blocks the inactivated sodium channel with rapid onset/offset kinetics. (aspetjournals.org)
  • The IC 50 values for the open-state sodium channel were 2.50 ± 1.16 µ M for Nav1.7 and 1.1 ± 0.2 µ M for Nav1.8, as determined by the block of persistent late currents in inactivation-deficient Nav1.7 and Nav1.8 channels, respectively. (aspetjournals.org)
  • Sodium channels only conduct currents in the open state and, once inactivated, have to return to the resting state, favored by membrane hyperpolarization, before they can reopen. (allindianpatents.com)
  • Tetrodotoxin (TTX)-sensitive sodium channels carry large transient currents during action potentials and also "persistent" sodium current, a noninactivating TTX-sensitive current present at subthreshold voltages. (nih.gov)
  • A-887826 was approximately 3 fold less potent to block Na(v)1.2, approximately 10 fold less potent to block tetrodotoxin-sensitive sodium (TTX-S Na(+)) currents and was >30 fold less potent to block Na(V)1.5 channels. (londonspine.com)
  • A-887826 potently blocked tetrodotoxin-resistant sodium (TTX-R Na(+)) currents (IC(50)=8nM) from small diameter rat dorsal root ganglion (DRG) neurons in a voltage-dependent fashion. (londonspine.com)
  • The present data demonstrate that A-887826 is a structurally novel and potent Na(v)1.8 blocker that inhibits rat DRG TTX-R currents in a voltage-, but not frequency-dependent fashion. (londonspine.com)
  • Dual actions of procainamide on batrachotoxin-activated sodium channels: open channel block and prevention of inactivation. (abcam.com)
  • Class I agents are grouped by their effect on the Na + channel, and by their effect on cardiac action potentials . (wikipedia.org)
  • An in vitro model of WM compression injury also found recovery of compound action potentials was enhanced when Ca 2+ was removed from the bathing medium or when the Na + channel blocker TTX was added in the presence of Ca 2+ ( Agrawal and Fehlings, 1996 ). (jneurosci.org)
  • These drugs bind to and block the fast sodium channels that are responsible for the rapid depolarization (phase 0) of fast-response cardiac action potentials. (lecturio.com)
  • The differences between the three subgroups within class 1 are that, in addition to affecting phase 0 of the action potentials, sodium channel blockers may also alter the action potential duration (APD) and effective refractory period (ERP). (lecturio.com)
  • Voltage-gated ion channels allow electrically excitable cells to generate and propagate action potentials and therefore are crucial for nerve and muscle function. (allindianpatents.com)
  • In excitable cells such as neurons and myocytes , sodium channels are responsible for the rising phase of action potentials . (bionity.com)
  • The purpose of this study is to determine whether late sodium channel blockade might be effective in shortening the QTc interval in various LQT3 mutations and be considered as a safe therapeutic option for LQT3 patients. (clinicaltrials.gov)
  • Thus, in monkeys, chronic blockade of NMDA receptors is relatively well tolerated, whereas blockade of sodium channels (perhaps in conjunction with NMDA receptor blockade) has long-term-perhaps permanent-consequences. (sigmaaldrich.com)
  • In the rat, blockade of sodium channels was well tolerated but blockade of NMDA receptors had significant and long-term (permanent? (sigmaaldrich.com)
  • 2,3 In pre-clinical in vitro data, NKTR-171 was shown to produce frequency-dependent blockade of inactivated sodium channels, meaning NKTR-171 preferentially blocks the abnormal, rapidly-firing neurons associated with neuropathic pain and spares normal nerve function in unaffected tissues. (bio-medicine.org)
  • Therefore, sodium channel blockers have no direct effect on nodal tissue, at least through the blockade of fast sodium channels. (lecturio.com)
  • Blockade of sodium channels by ketamine shows voltage dependency, an important feature of local anesthetic action. (nih.gov)
  • Coencapsulation of site 1 sodium-channel blockers [tetrodotoxin (TTX), saxitoxin (STX), etc., which block the sodium channel at site 1 on the outer surface] with conventional local anesthetics also greatly prolonged sciatic nerve blockade. (pnas.org)
  • NKTR ) today announced that the first subjects were dosed in a Phase 1 clinical study for NKTR-171, a new sodium channel blocker being developed as an oral therapy for the treatment of peripheral neuropathic pain. (bio-medicine.org)
  • NKTR-171 is a new molecular entity that is specifically designed to treat neuropathic pain by blocking hyperactive neuronal sodium channels associated with damaged nerves in the peripheral nervous system.Chronic neuropathic pain arises from nerves injured or damaged by systemic disease, infection, toxins, or physical trauma that are in a continuous state of hyper-excitability, often due to aberrant sodium channel firing. (bio-medicine.org)
  • A peripherally-restricted sodium channel blocker with good efficacy and low CNS side effects would be an important advance in the treatment of patients with debilitating neuropathic pain. (bio-medicine.org)
  • Today, medicines that act by blocking sodium or calcium channels such as the gabapentinoids and anti-epileptic medications, are used in the treatment of neuropathic pain but are known to cause significant CNS-related side effects, such as sedation and dizziness. (bio-medicine.org)
  • In particular, this invention is directed to biaryl substituted 6-membered pyridine, pyrimidine and pyrazine compounds that are sodium channel blockers useful for the treatment of chronic and neuropathic pain. (allindianpatents.com)
  • It is well known that.the voltage-gated Na+ channels in nerves play a critical role in neuropathic pain. (allindianpatents.com)
  • The α-aminoamide family of sodium ion channel blockers have exhibited analgesic effects on neuropathic pain. (mdpi.com)
  • Class Ia agents block the fast sodium channel, which depresses the phase 0 depolarization (i.e. reduces V max ), which prolongs the action potential duration by slowing conduction. (wikipedia.org)
  • These drugs help to stop the fast depolarization by blocking the sodium channels that are causing this problem. (medicscenter.com)
  • Phase 0 represents the rapid depolarization phase that occurs because of the influx of sodium. (lecturio.com)
  • Voltage-gated ion channels are implicated in the regulation of synaptic transmission, muscle contraction and hormone secretion in response to membrane depolarization. (duhnnae.com)
  • Sodium channels play a special role by mediating rapid depolarization, which constitutes the rising phase of the action potential and in turn activates voltage-gated calcium and potassium channels. (allindianpatents.com)
  • Following membrane depolarization, sodium channels open rapidly and then inactivate. (allindianpatents.com)
  • During an action potential the channel remains inactivated for a few milliseconds after depolarization. (bionity.com)
  • Activation of transient as well as persistent sodium current at subthreshold voltages produces amplification of EPSPs that is sensitive to the rate of depolarization and can help account for the dependence of spike threshold on depolarization rate, as previously observed in vivo. (nih.gov)
  • Site-1 Sodium Channel Blockers as Local Anesthetics:Will Neosaxitoxin Supplant the Need for Continuous Nerve Blocks? (asahq.org)
  • In contrast, site 1 sodium-channel blockers do not cause myo- or neurotoxicity ( 9 , 10 ), which would make them desirable for an extended release formulation. (pnas.org)
  • Here, we developed prolonged duration local anesthetics based entirely on site 1 sodium-channel blockers, the hypothesis being that there would be less harm to local tissue. (pnas.org)
  • It is termed as post-repolarization refractoriness (PRR) that is thought to be one of main anti-arrhythmic mechanisms of class I sodium channel blockers (SCBs). (elsevier.com)
  • Class I antiarrhythmic agents interfere with the (Na + ) channel . (wikipedia.org)
  • Class Ib antiarrhythmic agents are sodium channel blockers. (wikipedia.org)
  • Of the sodium channel blocking antiarrhythmic agents (the class I antiarrhythmic agents), the class Ic agents have the most potent sodium channel blocking effects. (wikipedia.org)
  • A sodium channel blocker is a medication that is categorized as a Class I antiarrhythmic drug. (wisegeek.com)
  • Previous studies have reported that enhanced antiarrhythmic effects occur when agents that prolong repolarization are combined with agents that block the sodium channels. (aspetjournals.org)
  • Sodium channel blockers comprise the class 1 antiarrhythmic compounds according to the Vaughan-Williams classification scheme. (lecturio.com)
  • Because some sodium channel blockers increase the ERP (class 1-A), while others decrease it (class 1-B) or have no effect on it (class 1-C), the Vaughan-Williams classification recognizes these differences as subclasses of class 1 antiarrhythmic drugs. (lecturio.com)
  • However, whether other antiarrhythmic drugs are also a significant cause of this, alone or in combination with beta-blockers, is not well known. (dovepress.com)
  • Abstract 14948: Clinical Characteristics of Idiopathic Ventricular Fibrillation with Early Repolarization and Response of Early Repolarization to Sodium Channel Blocker: Comparison to Brugada Syndrome with Ventricular Fibrillation. (ahajournals.org)
  • Abstract : Voltage-gated sodium channels are a class of large integral membrane proteins, composed of a highly processed α subunit and one or several smaller β subunits. (duhnnae.com)
  • As a measure of potency as voltage-gated sodium channel blockers, all the synthesized analogues were profiled for their ability to inhibit the veratridine-stimulated Na + influx in murine primary neuronal cultures. (elsevier.com)
  • a subset of the synthesized compounds can only moderately inhibit the sodium ion channel, Nav1.7, in a whole-cell patch clamp assay. (mdpi.com)
  • The use of calcium channel blockers administered intra-nasally to inhibit olfactory sensory perception to treat eating disorders, including obesity, is described. (google.com)
  • Loop diuretics, such as furosemide , inhibit the body's ability to reabsorb sodium at the ascending loop in the nephron , which leads to an excretion of water in the urine, whereas water normally follows sodium back into the extracellular fluid. (wikipedia.org)
  • Thiazide -type diuretics such as hydrochlorothiazide act on the distal convoluted tubule and inhibit the sodium-chloride symporter leading to a retention of water in the urine, as water normally follows penetrating solutes. (wikipedia.org)
  • inhibit calcium from entering channels. (studystack.com)
  • The main groups include sodium channel blockers, calcium current inhibitors, gamma-aminobutyric acid (GABA) enhancers, glutamate blockers, carbonic anhydrase inhibitors, hormones, and drugs with unknown mechanisms of action (see the image below). (medscape.com)
  • LIBOURNE FRANCE and DURHAM NC (January 19, 2016) - Ceva Santé Animale and Zoion Pharma Inc. announced today that they have entered into a collaboration to develop an epithelial sodium channel (ENaC) inhibitor to treat veterinary ocular surface diseases characterized by a lack of surface hydration, such as keratoconjunctivitis sicca (KCS) commonly called dry eye. (parion.com)
  • This toxin is thought to be a specific peptide inhibitor of acid-sensing ion channel (ASIC1), a member of the Deg/ENaC superfamily of cation channels. (biomedsearch.com)
  • Jensen, TS 2017, ' Selective sodium channel blockers in trigeminal neuralgia ' Lancet Neurology , vol 16, no. 4, pp. 255-256. (au.dk)
  • Background: Current standard of care for trigeminal neuralgia is treatment with the sodium channel blockers carbamazepine and oxcarbazepine, which although effective are associated with poor tolerability and the need for titration. (uzh.ch)
  • These properties are reminiscent of several other known sodium channel blockers and suggested that vinpocetine may exhibit frequency-dependent block. (aspetjournals.org)
  • The models were generated based on the known sodium channel blockers divided into three groups according to their structural features. (duhnnae.com)
  • Vinpocetine produced a concentration- and state-dependent inhibition of Na V 1.8 sodium channel activity. (aspetjournals.org)
  • The half-inhibition concentrations (IC 50 values) of WB4101 were 11.6 ± 2.07 and 1.0 ± 0.07 µ M for the resting and inactivated Nav1.7 channels, respectively, and 8.67 ± 1.31 and 0.91 ± 0.25 µ M for the resting and inactivated Nav1.8 channels, respectively. (aspetjournals.org)
  • Further, the state-dependent inhibition on sodium channels induced by WB4101 was demonstrated in dorsal root ganglion neurons. (aspetjournals.org)
  • Therefore, the inhibition of voltage-gated sodium channels could be an effective strategy to prevent the development of these diseases. (duhnnae.com)
  • We found that both the F(4i15)Y and V(4i18)I mutations reduced the inhibition of sodium current by indoxacarb, DCJW (an active metabolite of indoxacarb) and metaflumizone. (duke.edu)
  • CB1R is ubiquitously expressed on neurons throughout the central nervous system primarily at pre-synaptic sites, and is activated by the endocannabinoids AEA or 2-AG to decrease the probability of neurotransmitter release through inhibition of voltage-dependent calcium channels or activation of inwardly rectifying potassium channels ( Wilson and Nicoll, 2002 ). (frontiersin.org)
  • Inhaled ENaC blockers with a reduced potential to induce hyperkalaemia provide a therapeutic strategy to improve mucosal hydration and MCC in the lungs of CF patients. (sigmaaldrich.com)
  • The present study describes the preclinical profile of a novel ENaC blocker, NVP-QBE170, designed for inhaled delivery, with a reduced potential to induce hyperkalaemia. (sigmaaldrich.com)
  • NVP-QBE170 highlights the potential for inhaled ENaC blockers to exhibit efficacy in the airways with a reduced risk of hyperkalaemia, relative to existing compounds. (sigmaaldrich.com)
  • In addition, our photoamiloride/ENaC system can be used to manipulate the polarization state of cells - the magnitude of the electrical potential across the cell membrane - by altering the flow of sodium ions through these channels," Dirk Trauner adds. (phys.org)
  • Some antiepileptic drugs work by acting on combination of channels or through some unknown mechanism of action. (medscape.com)
  • Class 1 consists of sodium channel blockers, which are in turn divided into three subgroups-classes 1-A, 1-B, and 1-C. This will be explained in detail in the Mechanism of Action section. (lecturio.com)
  • For patients on a sodium channel blocker, combinations with a second drug of a different mechanism were associated with 15% lower risk of emergency department visits than with a second sodium channel blocker ( P =0.03). (medpagetoday.com)
  • Although findings with other sodium channel blockers or gamma-aminobutyric acid analog combinations were not significant, the direction of these findings was consistent with lower hazards associated with different-mechanism of action combinations," the researchers noted. (medpagetoday.com)
  • Sodium channel blockers are also used as local anesthetics and anticonvulsants. (wikipedia.org)
  • Targeting membrane-impermeant polar local anesthetics specifically into pain fibers by activation of nociceptive-specific transducer channels could be used clinically to produce a long-lasting nociceptive-selective block while preserving motor and autonomic function-a regional analgesia. (asahq.org)
  • Sodium channels are the target of a diverse array of pharmacological agents, including neurotoxins, antiarrhythmics, anticonvulsants and local anesthetics. (allindianpatents.com)
  • Mutations in the transmembrane helix S6 of domain IV confer cockroach sodium channel resistance to sodium channel blocker insecticides and local anesthetics. (duke.edu)
  • They preferably bind to and trap sodium channels in the slow-inactivated non-conducting state, a mode of action similar to that of local anesthetics (LAs). (duke.edu)
  • Results of pH-dependence experiments led to the proposal of two alternative access pathways for local anesthetics to their binding site, a hydrophobic pathway through the membrane phase, and a hydrophilic pathway for the charged form of the molecules from the intracellular side of the membrane, through the activation gate of the channel. (frontiersin.org)
  • Many structures and processes are involved in the development of a seizure, including neurons, ion channels, receptors, glia, and inhibitory and excitatory synapses. (medscape.com)
  • We examined gating of subthreshold sodium current in dissociated cerebellar Purkinje neurons and hippocampal CA1 neurons, studied at 37°C with near-physiological ionic conditions. (nih.gov)
  • Either the presence of the voltage-dependent sodium channel blocker tetrodotoxin (TTX), or the removal of mature neurons, inhibited the AM251-induced increase in DCX(+) cells. (frontiersin.org)
  • Focal microinjection of tetrodotoxin (TTX), a potent voltage-gated sodium channel blocker, reduces neurological deficits and tissue loss after spinal cord injury (SCI). (jneurosci.org)
  • Eslicarbazepine acetate is a voltage-gated sodium channel blocker. (businesswire.com)
  • Controlling epithelial sodium channels with light using photoswitchable amilorides. (phys.org)
  • The library was designed as a special screening collection comprising compounds with predicted sodium channels blocking activity and selectivity. (duhnnae.com)
  • All voltage-gated sodium channels are characterized by a high degree of selectivity for sodium over other ions and by their voltage-dependent gating. (allindianpatents.com)
  • Nevertheless, it has been possible to produce sodium channel blockers with therapeutic selectivity and a sufficient therapeutic window for the treatment of epilepsy (e.g. lamotrigine, phenytoin and carbamazepine) and certain cardiac arrhythmias (e.g. lignocaine, tocainide and mexiletine). (allindianpatents.com)
  • The pore of sodium channels contains a selectivity filter made of negatively charged amino acid residues, which attract the positive Na + ion and keep out negatively charged ions such as chloride . (bionity.com)
  • The sodium channel blocker test is increasingly used in patients who have non-diagnostic type two or type three Br-ECG as the test (using a drug such as flecainide) can unmask type one Br-ECG, which is indicative of Brugada syndrome. (cardiacrhythmnews.com)
  • The sodium channel blocker test was performed with intravenous administration of either flecainide to a target dose of 2mg/kg in five minutes or ajmaline to target dose of 1mg/kg in five to 10 minutes. (cardiacrhythmnews.com)
  • This stops the flow of sodium ions or sometimes only slows it down. (medicscenter.com)
  • After the binding of the sodium channels, the flow of sodium ions will either slow down or stops completely. (medicscenter.com)
  • And that helps in getting rid of the many problems that were caused due to this problem of flow of sodium ions. (medicscenter.com)
  • Sodium channels are important proteins in modulating neuronal membrane excitability. (aspetjournals.org)
  • Genetic studies from patients and animals have indicated neuronal sodium channels play key roles in pain sensitization. (aspetjournals.org)
  • This natural product is known to suppress neuronal spontaneous calcium ion oscillations through its voltage-gated sodium channel blocking ability which is of significant interest in CNS drug discovery. (elsevier.com)
  • There has been much speculation that aberrant influx of sodium ions through ENaCs might contribute to the pathogenesis of neuronal diseases by causing persistent, uncontrolled firing by nerve cells. (phys.org)
  • It selectively targets the slow inactivated state of the sodium ion channel (which have been implicated in the pathogenesis of epilepsy), preventing its return to the active state, and thereby reduces repetitive neuronal firing. (businesswire.com)
  • We demonstrated that WB4101 inhibited both Nav1.7 and Nav1.8 channels with similar levels of potency. (aspetjournals.org)
  • WB4101 induced a hyperpolarizing shift in the voltage-dependent inactivation for both Nav1.7 (15 mV) and Nav1.8 (20 mV) channels. (aspetjournals.org)
  • Consistent with the state-dependent block, the drug also displayed use-dependent inhibitory properties on both wild-type Nav1.7 and Nav1.8 channels, which were removed by the local anesthetic-insensitive mutations but still existed in the inactivation-deficient channels. (aspetjournals.org)
  • BIIB074, a Nav1.7-selective, state-dependent sodium-channel blocker, can be administered at therapeutic doses without titration, and has shown good tolerability in healthy individuals in phase 1 studies. (uzh.ch)
  • Nav1.7 and other voltage-gated sodium channels as drug targets for pain relief. (ucl.ac.uk)
  • Lamotrigine is known to block sodium channels but it is not known whether it is extracellular or intracellular. (wikipedia.org)
  • High extracellular K + concentrations decreased Na 2 S and abolished GYY4137 relaxation suggesting potassium channel-independent mechanisms are also involved Na 2 S relaxation while potassium channel activation is pivotal for GYY4137 relaxation in small arteries. (au.dk)
  • This is the first type of sodium channel blockers named Extracellular channel blockers. (medicscenter.com)
  • When stimulated by a change in transmembrane voltage , this region moves toward the extracellular side of the cell membrane, allowing the channel to become permeable to ions. (bionity.com)
  • The major drug binding site of sodium channels is inaccessible from the extracellular side, drug molecules can only access it either from the membrane phase, or from the intracellular aqueous phase. (frontiersin.org)
  • Herein, we describe the identification of a novel series of structurally related pyridine derivatives as potent Na(v)1.8 channel blockers. (londonspine.com)
  • LQT3 mutations in the LQTS Registry will be studied using in vitro expression studies to determine whether ranolazine causes a decrease in late sodium current, slower recovery from inactivation and/or changes in time course of inactivation, ameliorating the causative functional effect of each individual mutation. (clinicaltrials.gov)
  • Vinpocetine also produced an ∼22 mV leftward shift in the voltage dependence of Na V 1.8 channel inactivation but did not affect the voltage range of channel activation. (aspetjournals.org)
  • Different sodium channel subtypes vary in the voltage range over which they activate and inactivate as well as in their activation and inactivation kinetics. (allindianpatents.com)
  • The ability to inactivate is thought to be due to a tethered plug (formed by domains III and IV of the alpha subunit), called an inactivation gate, that blocks the inside of the channel shortly after it has been activated. (bionity.com)
  • Genetic diseases that alter Na + channel inactivation cause muscle stiffness because of the introduction of a window current. (bionity.com)
  • An epithelial sodium channel blocker is a sodium channel blocker that is selective for the epithelial sodium channel. (wikipedia.org)
  • One such TTXr channel, termed Na V 1.8, is of particular interest because of its prominent and selective expression in peripheral afferent nerves. (aspetjournals.org)
  • We recently reported that a charged sodium-channel blocker can be targeted selectively into nociceptors through activation of transient receptor potential vanilloid 1 (TRPV1) channels, producing a nociceptive-selective local analgesia. (asahq.org)
  • The study was designed to test the hypothesis that the epithelial sodium channel is activated proteolytically by urine plasmin in diabetic nephropathy and mediates renal sodium retention. (sdu.dk)
  • This is large in comparison to normal renal sodium reabsorption which leaves only about 0.4% of filtered sodium in the urine. (wikipedia.org)
  • Interaction between selected sodium and potassium channel blockers in guinea pig papillary muscle. (aspetjournals.org)
  • In this study, the interactions between the prolongation of action potential duration (APD) by a potassium channel blocker and the reduction in the maximal upstroke velocity of phase 0 of action potential (Vmax) by sodium channel blockers were investigated in guinea pig papillary muscle using conventional microelectrode techniques. (aspetjournals.org)
  • potassium channel blocker potassium channel blocking agent. (thefreedictionary.com)
  • Big conductance calcium-activated potassium channel openers control spasticity without sedation. (ucl.ac.uk)
  • Unlike ST elevation in right precordial lead in BS, early repolarization in inferior or lateral leads in both ERS and BS patients were attenuated by sodium channel blocker infusion. (ahajournals.org)
  • Employing a standard microelectrode technique, we evaluated APD measured at 90% repolarization (APD 90 ) and the sodium channel availability, judged from the maximal rate of rise of action potential (Vmax). (elsevier.com)
  • Sodium channel blockers are drugs which impair the conduction of sodium ions (Na + ) through sodium channels . (wikipedia.org)
  • Class Ib drugs tend to be more specific for voltage gated Na channels than Ia. (wikipedia.org)
  • Medications to treat AFib include beta-blockers, blood thinners, and heart rhythm drugs. (medicinenet.com)
  • These drugs work like beta blockers. (healthline.com)
  • One of those special drugs is Sodium Channel Blockers . (medicscenter.com)
  • These drugs work on the blocking of sodium channel to stop or slow down the sodium ions flow through it. (medicscenter.com)
  • We can describe Sodium Channel Blockers as drugs that lessen or sometimes stop the flow of sodium particles. (medicscenter.com)
  • These sodium particles are meant to flow through sodium channel and these drugs work to stop or control their flow. (medicscenter.com)
  • According to research, any kind of drugs that deal with voltage-gated sodium channels are good for this pain. (medicscenter.com)
  • By blocking these channels, these drugs reduce the heart rate and the speed of conduction in the heart. (lecturio.com)
  • If I use this calcium channel blocker and anticholesterol drug, and work on my diet, exercise and lose weight can I eventually get all drugs? (healthtap.com)
  • In particular, the sodium channel drugs can cause dizziness, so when you combine them you often see side effects. (medpagetoday.com)
  • Also described is a method of reducing food intake in a subject by administering a pharmaceutical composition comprising an effective amount of a calcium channel blocker to the nasal mucosa, as well as screening methods for drugs to be used in treating obesity or associated disorders. (google.com)
  • These natural substances completely shut down the open channel by the process of binding and occluding. (medicscenter.com)
  • At negative or hyperpolarized membrane potentials, sodium channels are closed. (allindianpatents.com)
  • 3. Sotalol (Aggressive beta blocker with secondary effects. (medhelp.org)
  • A number of cell types are known to express tetrodotoxin-resistant (TTXr) sodium conductances, the molecular bases of which have remained elusive until recently. (aspetjournals.org)
  • Taking too much calcium chamber blockers such as amlodipine , Diltiazem or verapamil. (healthtap.com)
  • An agent that inhibits sodium influx through cell membranes. (ebi.ac.uk)
  • These compounds bind the voltage-gated sodium channels responsible for producing peripheral nerve block with relatively low affinity and limited specificity. (asahq.org)
  • OTAVA Ltd. offers new Voltage-gated sodium channel blockers library containing 1630 compounds. (duhnnae.com)
  • Biaryl substituted pyridine, pyrimidine and pyrazine compounds are sodium channel blockers useful for the treatment of pain. (allindianpatents.com)
  • Our data are best explained by a model where drug molecules can be trapped in at least two chemically different environments: A hydrophilic trap (which may be the aqueous cavity within the inner vestibule), which favors polar and less lipophilic compounds, and a lipophilic trap (which may be the membrane phase itself, and/or lipophilic binding sites on the channel). (frontiersin.org)
  • Turning off the light or irradiating the cells with green light alters the shape of the compound in such a way that the block is released and sodium ions flow through the channel pore into the cell. (phys.org)
  • This results in several effects including bicarbonate accumulation in the urine and decreased sodium absorption. (wikipedia.org)
  • Most of anti-arrhythmic agents, including SCBs, have multi-channel blocking effects. (elsevier.com)
  • While conventional sodium channel blockers have demonstrated efficacy in addressing peripheral nerve pain, the CNS-mediated side effects associated with these medicines make the treatment intolerable for many patients. (bio-medicine.org)
  • Chronic exposure to NMDA receptor and sodium channel blockers during development in monkeys and rats: long-term effects on cognitive function. (sigmaaldrich.com)
  • To further explore the roles of NMDA receptors and sodium channels in these effects, MK-801, phenytoin (sodium channel blocker), or both were administered to rats and the acquisition of tasks similar to those used in the monkey study were assessed. (sigmaaldrich.com)
  • Sodium channel blockers are used in the treatment of cardiac arrhythmia . (wikipedia.org)
  • In addition, cardiac arrhythmias and epileptic activity can be treated with sodium channel blockers. (eurekaselect.com)
  • Neosaxitoxin and similar neurotoxins have low affinity for cardiac sodium channels (Na v 1.5) relative to their affinity for the sodium channel isoforms (Na v 1.7, Na v 1.8, and others) found in peripheral nerves. (asahq.org)
  • It was demonstrated that dysfunction of voltage-gated sodium channels led to the development of a wide range of human pathologies such as inherited epilepsy, migraine, periodic paralysis, cardiac arrhythmia, chronic pain syndromes and others. (duhnnae.com)
  • Significantly more patients who experienced at least one arrhythmic event during follow-up (mean 59±33 months) had a positive sodium channel blocker test (p=0.02) and a history of cardiac arrest or syncope (p=0.002) than patients who had no events during follow-up. (cardiacrhythmnews.com)
  • These channels allow calcium to enter cardiac cells. (rarediseases.org)
  • Use of beta blockers, pacemakers, and implant of cardiac defibrillators can be used to reduce arrhythmias and prevent cardiac arrest. (rarediseases.org)
  • The α-subunit forms ion-conducting aqueous pore whereas auxiliary β subunits modify the kinetics and voltage-dependence of channel gating. (duhnnae.com)
  • Voltage-gated sodium channels normally consist of an alpha subunit which forms the ion conduction pore and one to two beta subunits which have several functions including modulation of channel gating. (bionity.com)
  • [2] Expression of the alpha subunit alone is sufficient to produce a functional channel. (wikidoc.org)
  • In conclusion, the present study identified WB4101 as a sodium channel blocker with an open-state-dependent property, which may contribute to WB4101's analgesic action. (aspetjournals.org)
  • 4 provide evidence for the safety and analgesic potential of neosaxitoxin, a site-1 sodium channel blocker. (asahq.org)
  • Patients should be aware that a sodium channel blocker drug can cause chest pain, jaundice, and pain in the upper right area of the stomach. (wisegeek.com)
  • Before taking a sodium channel blocker, patients must disclose their other medical conditions, medications, and supplements. (wisegeek.com)
  • To distinguish precisely between ERS and BS, provocative tests with sodium-channel blockers were performed in all ERS and BS patients. (ahajournals.org)
  • L'objectif de cette étude était de passer en revue la prise en charge de l'anesthésie et les pronostics périopératoires de patients atteints du syndrome de Brugada (BrS) traités dans un seul centre et de comparer ces pronostics à une analyse exhaustive de la littérature existante. (springer.com)
  • Une révision rétrospective des dossiers anesthésiques de patients porteurs d'un BrS à la Clinique Mayo a été entreprise en recherchant particulièrement les médicaments administrés, les modifications au niveau du segment ST et la survenue de complications, y compris la mort, l'instabilité hémodynamique et les dysrythmies. (springer.com)
  • A study published online in the HeartRhythm Journal indicates that while the sodium channel blocker test has good prognostic value in symptomatic patients with non-diagnostic Brugada ECG (Br-ECG), it appears to have little value in asymptomatic patients. (cardiacrhythmnews.com)
  • However, they added that previous studies were not specifically designed to assess the outcome of patients with types two or three Br-ECG and also do not provide information about the protocol of the sodium channel blocker test used. (cardiacrhythmnews.com)
  • Zorzi et al wrote that their study confirms that the sodium channel blocker test in symptomatic patients with type two or type three Br-ECG is "justified" because it predicts (if positive) an increased risk of arrhythmic events during follow-up and "enables appropriate work-up for risk assessment and therapeutic interventions. (cardiacrhythmnews.com)
  • Zorzi et al concluded their study by saying that a prospective, validation study with larger number of patients and longer follow-up was needed before any final conclusions could be drawn on the value of the sodium channel blocker test. (cardiacrhythmnews.com)
  • When this gene is mutated, the closing of the channel is delayed, causing too much calcium to enter cells: this excess of calcium prolongs the QT interval in Timothy syndrome patients. (rarediseases.org)
  • Three patients were taking only beta-blockers (hereafter referred to as the BB group), while five patients were on both beta-blockers and Na channel blockers (hereafter referred to as the BB + Na group). (dovepress.com)
  • However, in some people, beta blockers may actually cause palpitations. (healthline.com)
  • Could a calcium channel blocker cause palpitations? (healthtap.com)
  • It is possible for a calcium blocker to cause palpitations. (healthtap.com)
  • Calcium channel blockers for AFib are centrally acting. (healthline.com)
  • Other calcium channel blockers are peripherally acting. (healthline.com)
  • Centrally-acting calcium channel blockers work by weakening your heart contractions. (healthline.com)
  • If you have heart failure or low blood pressure, you should not use calcium channel blockers. (healthline.com)
  • Is atacand (candesartan) a calcium channel blocker? (healthtap.com)
  • What the heck is calcium channel blocker overdose really? (healthtap.com)
  • Explain the problem of a calcium channel blocker overdose. (healthtap.com)
  • How are calcium channel blockers and beta blockers different? (healthtap.com)
  • The calcium blockers block the calcium channel plugs and the beta blockers block the beta receptor plugs. (healthtap.com)
  • Is it safe to go off my calcium channel blocker? (healthtap.com)
  • What are some calcium channel blockers? (healthtap.com)
  • Can you tell me commonly prescribed calcium channel blocker recommended by aha? (healthtap.com)
  • Treatment consists of short-term or as-needed pharmacotherapy using calcium channel or beta blockers when vagal maneuvers fail to halt or slow the rhythm. (aafp.org)
  • What do you have to remember about calcium channel blockers? (studystack.com)