Target type: biologicalprocess
Any process that stops, prevents, or reduces the frequency, rate or extent of transmission of a nerve impulse, the sequential electrochemical polarization and depolarization that travels across the membrane of a neuron in response to stimulation. [GOC:ai]
Negative regulation of transmission of nerve impulse is a crucial biological process that ensures precise and controlled communication between neurons. It involves a series of molecular mechanisms that modulate the flow of electrical signals along the axon, preventing excessive or inappropriate nerve impulse propagation. This fine-tuning of neuronal communication is vital for maintaining proper brain function, sensory perception, motor control, and overall physiological balance.
The primary mechanism of negative regulation of nerve impulse transmission revolves around the regulation of ion channels and neurotransmitter release.
1. **Ion Channel Modulation:**
* Voltage-gated sodium channels (Na+ channels) are key players in nerve impulse propagation. During depolarization, these channels open, allowing Na+ ions to rush into the neuron, generating an action potential. To regulate this process, several mechanisms can reduce Na+ channel activity:
* **Inactivation Gates:** These molecular structures within Na+ channels close after a certain period of depolarization, preventing further Na+ influx and limiting the duration of the action potential.
* **Repolarization:** The influx of K+ ions through voltage-gated potassium channels (K+ channels) restores the negative membrane potential, leading to channel closure.
* **Hyperpolarization:** Some neurons can experience hyperpolarization, a state where the membrane potential becomes even more negative than resting potential. This hyperpolarization can be triggered by the opening of potassium channels or the activation of chloride channels, making it more difficult for the neuron to reach the threshold for action potential firing.
2. **Neurotransmitter Release Inhibition:**
* Neurotransmitters, like acetylcholine or glutamate, are released from the presynaptic neuron and bind to receptors on the postsynaptic neuron, transmitting the signal. Inhibitory mechanisms can reduce neurotransmitter release or block postsynaptic receptors, preventing further signal propagation:
* **Presynaptic Inhibition:** The release of inhibitory neurotransmitters, like GABA or glycine, at presynaptic terminals can suppress the release of excitatory neurotransmitters.
* **Postsynaptic Inhibition:** Inhibitory neurotransmitters can bind to receptors on the postsynaptic neuron, triggering hyperpolarization or blocking the activation of excitatory pathways.
* **Receptor Desensitization:** Prolonged exposure to neurotransmitters can lead to receptor desensitization, reducing the sensitivity of the postsynaptic neuron.
3. **Signal Termination:**
* Neurotransmitters are rapidly removed from the synaptic cleft to terminate the signal. This process involves enzymatic degradation, reuptake by presynaptic neurons, or diffusion away from the synapse.
4. **Presynaptic Autoregulation:**
* Some neurons possess autoreceptors that sense the concentration of neurotransmitters released. When neurotransmitter levels rise, these autoreceptors activate signaling pathways that decrease further neurotransmitter release.
These intricate regulatory mechanisms work in concert to ensure that neuronal communication remains precise, efficient, and adaptable. Negative regulation of nerve impulse transmission plays a critical role in preventing neuronal overexcitation, maintaining neural plasticity, and preserving overall brain function. Disruptions in these regulatory processes can lead to neurological disorders and dysfunctions.'
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| Protein | Definition | Taxonomy |
|---|---|---|
| Melatonin receptor type 1B | A melatonin receptor type 1B that is encoded in the genome of human. [PRO:WCB, UniProtKB:P49286] | Homo sapiens (human) |
| Vasopressin V1a receptor | A vasopressin V1a receptor that is encoded in the genome of human. [PRO:WCB, UniProtKB:P37288] | Homo sapiens (human) |
| Glycine receptor subunit alpha-1 | A glycine receptor subunit alpha-1 that is encoded in the genome of human. [PRO:DNx, UniProtKB:P23415] | Homo sapiens (human) |
| Compound | Definition | Classes | Roles |
|---|---|---|---|
| glycine | alpha-amino acid; amino acid zwitterion; proteinogenic amino acid; serine family amino acid | EC 2.1.2.1 (glycine hydroxymethyltransferase) inhibitor; fundamental metabolite; hepatoprotective agent; micronutrient; neurotransmitter; NMDA receptor agonist; nutraceutical | |
| melatonin | acetamides; tryptamines | anticonvulsant; central nervous system depressant; geroprotector; hormone; human metabolite; immunological adjuvant; mouse metabolite; radical scavenger | |
| methylbufotenin | 5-methoxy-N,N-dimethyltryptamine : A tryptamine alkaloid that is N,N-dimethyltryptamine substituted by a methoxy group at position 5. | aromatic ether; tertiary amino compound; tryptamine alkaloid | hallucinogen; plant metabolite |
| 6-chloromelatonin | acetamides | ||
| 6-hydroxymelatonin | 6-hydroxymelatonin : A member of the class of tryptamines that is melatonin with a hydroxy group substituent at position 6. | acetamides; tryptamines | metabolite; mouse metabolite |
| astemizole | astemizole : A piperidine compound having a 2-(4-methoxyphenyl)ethyl group at the 1-position and an N-[(4-fluorobenzyl)benzimidazol-2-yl]amino group at the 4-position. Astemizole: Antihistamine drug now withdrawn from the market in many countries because of rare but potentially fatal side effects. | benzimidazoles; piperidines | anti-allergic agent; anticoronaviral agent; H1-receptor antagonist |
| fluspirilene | Fluspirilene: A long-acting injectable antipsychotic agent used for chronic schizophrenia. | diarylmethane | |
| mefloquine hydrochloride | [2,8-bis(trifluoromethyl)quinolin-4-yl]-(2-piperidyl)methanol : An organofluorine compound that consists of quinoline bearing trifluoromethyl substituents at positions 2 and 8 as well as a (2-piperidinyl)hydroxymethyl substituent at position 4. | organofluorine compound; piperidines; quinolines; secondary alcohol | |
| propranolol | propranolol : A propanolamine that is propan-2-ol substituted by a propan-2-ylamino group at position 1 and a naphthalen-1-yloxy group at position 3. Propranolol: A widely used non-cardioselective beta-adrenergic antagonist. Propranolol has been used for MYOCARDIAL INFARCTION; ARRHYTHMIA; ANGINA PECTORIS; HYPERTENSION; HYPERTHYROIDISM; MIGRAINE; PHEOCHROMOCYTOMA; and ANXIETY but adverse effects instigate replacement by newer drugs. | naphthalenes; propanolamine; secondary amine | anti-arrhythmia drug; antihypertensive agent; anxiolytic drug; beta-adrenergic antagonist; environmental contaminant; human blood serum metabolite; vasodilator agent; xenobiotic |
| risperidone | risperidone : A member of the class of pyridopyrimidines that is 2-methyl-6,7,8,9-tetrahydropyrido[1,2-a]pyrimidin-4-one carrying an additional 2-[4-(6-fluoro-1,2-benzoxazol-3-yl)piperidin-1-yl]ethyl group at position 2. Risperidone: A selective blocker of DOPAMINE D2 RECEPTORS and SEROTONIN 5-HT2 RECEPTORS that acts as an atypical antipsychotic agent. It has been shown to improve both positive and negative symptoms in the treatment of SCHIZOPHRENIA. | 1,2-benzoxazoles; heteroarylpiperidine; organofluorine compound; pyridopyrimidine | alpha-adrenergic antagonist; dopaminergic antagonist; EC 3.4.21.26 (prolyl oligopeptidase) inhibitor; H1-receptor antagonist; psychotropic drug; second generation antipsychotic; serotonergic antagonist |
| catechin | (+)-catechin : The (+)-enantiomer of catechin and a polyphenolic antioxidant plant metabolite. catechin : Members of the class of hydroxyflavan that have a flavan-3-ol skeleton and its substituted derivatives. Catechin: An antioxidant flavonoid, occurring especially in woody plants as both (+)-catechin and (-)-epicatechin (cis) forms. rac-catechin : A racemate comprising equimolar amounts of (+)- and (-)-catechin | catechin | antioxidant; plant metabolite |
| 4,4'-bisphenol f | 4,4'-bisphenol F: RN given refers to parent cpd bisphenol F : A bisphenol that is methane in which two of the hydrogens have been replaced by 4-hydroxyphenyl groups. | bisphenol; diarylmethane | environmental food contaminant; xenoestrogen |
| dronabinol | Delta(9)-tetrahydrocannabinol : A diterpenoid that is 6a,7,8,10a-tetrahydro-6H-benzo[c]chromene substituted at position 1 by a hydroxy group, positions 6, 6 and 9 by methyl groups and at position 3 by a pentyl group. The principal psychoactive constituent of the cannabis plant, it is used for treatment of anorexia associated with AIDS as well as nausea and vomiting associated with cancer chemotherapy. Dronabinol: A psychoactive compound extracted from the resin of Cannabis sativa (marihuana, hashish). The isomer delta-9-tetrahydrocannabinol (THC) is considered the most active form, producing characteristic mood and perceptual changes associated with this compound. | benzochromene; diterpenoid; phytocannabinoid; polyketide | cannabinoid receptor agonist; epitope; hallucinogen; metabolite; non-narcotic analgesic |
| pimozide | pimozide : A member of the class of benzimidazoles that is 1,3-dihydro-2H-benzimidazol-2-one in which one of the nitrogens is substituted by a piperidin-4-yl group, which in turn is substituted on the nitrogen by a 4,4-bis(p-fluorophenyl)butyl group. Pimozide: A diphenylbutylpiperidine that is effective as an antipsychotic agent and as an alternative to HALOPERIDOL for the suppression of vocal and motor tics in patients with Tourette syndrome. Although the precise mechanism of action is unknown, blockade of postsynaptic dopamine receptors has been postulated. (From AMA Drug Evaluations Annual, 1994, p403) | benzimidazoles; heteroarylpiperidine; organofluorine compound | antidyskinesia agent; dopaminergic antagonist; first generation antipsychotic; H1-receptor antagonist; serotonergic antagonist |
| adapalene | adapalene : A naphthoic acid that is CD437 in which the phenolic hydroxy group has been converted to its methyl ether. Adapalene: A naphthalene derivative that has specificity for RETINOIC ACID RECEPTORS. It is used as a DERMATOLOGIC AGENT for the treatment of ACNE. | adamantanes; monocarboxylic acid; naphthoic acid | dermatologic drug; EC 2.7.11.22 (cyclin-dependent kinase) inhibitor; non-steroidal anti-inflammatory drug |
| relcovaptan | relcovaptan: a nonpeptide vasopressin V1 receptor antagonist; structure given in first source | proline derivative | |
| telmisartan | telmisartan : A member of the class of benzimidazoles used widely in the treatment of hypertension. Telmisartan: A biphenyl compound and benzimidazole derivative that acts as an angiotensin II type 1 receptor antagonist. It is used in the management of HYPERTENSION. | benzimidazoles; biphenyls; carboxybiphenyl | angiotensin receptor antagonist; antihypertensive agent; EC 3.4.15.1 (peptidyl-dipeptidase A) inhibitor; environmental contaminant; xenobiotic |
| s20098 | acetamides | ||
| 6-methoxy-2,3,4,9-tetrahydropyrido[3,4-b]indol-1-one | beta-carbolines | ||
| opc 21268 | OPC 21268: structure given in first source; vasopressin V1 receptor antagonist | ||
| 2-iodomelatonin | acetamides | ||
| mozavaptan | mozavaptan: aquaretic agent; vasopressin V2 receptor antagonist; structure given in first source | benzamides | aquaretic |
| luzindole | luzindole : A member of the class of indoles that is tryptamine in which one of the amino hydrogens is replaced by an acetyl group while the hydrogen at position 2 is replaced by a benzyl group. luzindole: melatonin receptor antagonist; structure given in first source | acetamides; indoles | melatonin receptor antagonist |
| 2-bromomelatonin | 2-bromomelatonin: structure given in first source | ||
| 5-methoxyluzindole | |||
| conivaptan | conivaptan : The amide resulting from the formal condensation of 4-[(biphenyl-2-ylcarbonyl)amino]benzoic acid with the benzazepine nitrogen of 2-methyl-1,4,5,6-tetrahydroimidazo[4,5-d][1]benzazepine. It is an antagonist for two of the three types of arginine vasopressin (AVP) receptors, V1a and V2. It is used as its hydrochloride salt for the treatment of hyponatraemia (low blood sodium levels) caused by syndrome of inappropriate antidiuretic hormone (SIADH). | benzazepine | aquaretic; vasopressin receptor antagonist |
| cinacalcet | cinacalcet : A secondary amino compound that is (1R)-1-(naphthalen-1-yl)ethanamine in which one of the hydrogens attached to the nitrogen is substituted by a 3-[3-(trifluoromethyl)phenyl]propyl group. | (trifluoromethyl)benzenes; naphthalenes; secondary amino compound | calcimimetic; P450 inhibitor |
| satavaptan | satavaptan: a vasopressin V2 receptor antagonist; structure given in first source | ||
| lixivaptan | |||
| ramelteon | ramelteon: melatonin MT1/MT2 receptor agonist | indanes | |
| tolvaptan | benzazepine; benzenedicarboxamide | aquaretic; vasopressin receptor antagonist | |
| ritonavir | ritonavir : An L-valine derivative that is L-valinamide in which alpha-amino group has been acylated by a [(2-isopropyl-1,3-thiazol-4-yl)methyl]methylcarbamoyl group and in which a hydrogen of the carboxamide amino group has been replaced by a (2R,4S,5S)-4-hydroxy-1,6-diphenyl-5-{[(1,3-thiazol-5-ylmethoxy)carbonyl]amino}hexan-2-yl group. A CYP3A inhibitor and antiretroviral drug from the protease inhibitor class used to treat HIV infection and AIDS, it is often used as a fixed-dose combination with another protease inhibitor, lopinavir. Also used in combination with dasabuvir sodium hydrate, ombitasvir and paritaprevir (under the trade name Viekira Pak) for treatment of chronic hepatitis C virus genotype 1 infection as well as cirrhosis of the liver. Ritonavir: An HIV protease inhibitor that works by interfering with the reproductive cycle of HIV. It also inhibits CYTOCHROME P-450 CYP3A. | 1,3-thiazoles; carbamate ester; carboxamide; L-valine derivative; ureas | antiviral drug; environmental contaminant; HIV protease inhibitor; xenobiotic |
| oxytocin | oxytocin : A cyclic nonapeptide hormone with amino acid sequence CYIQNCPLG that also acts as a neurotransmitter in the brain; the principal uterine-contracting and milk-ejecting hormone of the posterior pituitary. Together with the neuropeptide vasopressin, it is believed to influence social cognition and behaviour. Oxytocin: A nonapeptide hormone released from the neurohypophysis (PITUITARY GLAND, POSTERIOR). It differs from VASOPRESSIN by two amino acids at residues 3 and 8. Oxytocin acts on SMOOTH MUSCLE CELLS, such as causing UTERINE CONTRACTIONS and MILK EJECTION. | heterodetic cyclic peptide; peptide hormone | oxytocic; vasodilator agent |
| strychnine | strychnine : A monoterpenoid indole alkaloid that is strychnidine bearing a keto substituent at the 10-position. Strychnine: An alkaloid found in the seeds of STRYCHNOS NUX-VOMICA. It is a competitive antagonist at glycine receptors and thus a convulsant. It has been used as an analeptic, in the treatment of nonketotic hyperglycinemia and sleep apnea, and as a rat poison. | monoterpenoid indole alkaloid; organic heteroheptacyclic compound | avicide; cholinergic antagonist; glycine receptor antagonist; neurotransmitter agent; rodenticide |
| saquinavir | saquinavir : An aspartic acid derivative obtained by formal condensation of the primary amino group of (2S,3R)-4-[(3S,4aS,8aS)-3-(tert-butylcarbamoyl)octahydroisoquinolin-2(1H)-yl]-3-hydroxy-1-phenylbutan-2-ylamine with the carboxy group of N(2)(-quinolin-2-ylcarbonyl)-L-asparagine. An inhibitor of HIV-1 protease. Saquinavir: An HIV protease inhibitor which acts as an analog of an HIV protease cleavage site. It is a highly specific inhibitor of HIV-1 and HIV-2 proteases, and also inhibits CYTOCHROME P-450 CYP3A. | L-asparagine derivative; quinolines | antiviral drug; HIV protease inhibitor |
| diethylstilbestrol | diethylstilbestrol : An olefinic compound that is trans-hex-3-ene in which the hydrogens at positions 3 and 4 have been replaced by p-hydroxyphenyl groups. Diethylstilbestrol: A synthetic nonsteroidal estrogen used in the treatment of menopausal and postmenopausal disorders. It was also used formerly as a growth promoter in animals. According to the Fourth Annual Report on Carcinogens (NTP 85-002, 1985), diethylstilbestrol has been listed as a known carcinogen. (Merck, 11th ed) | olefinic compound; polyphenol | antifungal agent; antineoplastic agent; autophagy inducer; calcium channel blocker; carcinogenic agent; EC 1.1.1.146 (11beta-hydroxysteroid dehydrogenase) inhibitor; EC 3.6.3.10 (H(+)/K(+)-exchanging ATPase) inhibitor; endocrine disruptor; xenoestrogen |
| deaminooxytocin | demoxytocin : A heterodetic cyclic peptide that is the synthetic analog of the peptide hormone oxytocin where the free amino group in the half-cystine residue is replaced by hydrogen. The mechanism of action and pharmacological properties of demoxytocin and oxytocin are similar. The drug affects the permeability of the cell membrane, increasing the content of calcium ions in smooth muscle cells, thereby increasing its contraction. It stimulates the contraction of smooth muscles of the uterus, as well as stimulating the contraction of myoepithelial cells of the mammary gland, and enhances the secretion of milk. | heterodetic cyclic peptide | oxytocic |
| arginine vasopressin | Arginine Vasopressin: The predominant form of mammalian antidiuretic hormone. It is a nonapeptide containing an ARGININE at residue 8 and two disulfide-linked cysteines at residues of 1 and 6. Arg-vasopressin is used to treat DIABETES INSIPIDUS or to improve vasomotor tone and BLOOD PRESSURE. argipressin : The predominant form of mammalian vasopressin (antidiuretic hormone). It is a nonapeptide containing an arginine at residue 8 and two disulfide-linked cysteines at residues of 1 and 6. | vasopressin | cardiovascular drug; hematologic agent; mitogen |
| sulindac | sulindac : A monocarboxylic acid that is 1-benzylidene-1H-indene which is substituted at positions 2, 3, and 5 by methyl, carboxymethyl, and fluorine respectively, and in which the phenyl group of the benzylidene moiety is substituted at the para position by a methylsulfinyl group. It is a prodrug for the corresponding sulfide, a non-steroidal anti-inflammatory drug, used particularly in the treatment of acute and chronic inflammatory conditions. Sulindac: A sulfinylindene derivative prodrug whose sulfinyl moiety is converted in vivo to an active NSAID analgesic. Specifically, the prodrug is converted by liver enzymes to a sulfide which is excreted in the bile and then reabsorbed from the intestine. This helps to maintain constant blood levels with reduced gastrointestinal side effects. | monocarboxylic acid; organofluorine compound; sulfoxide | analgesic; antineoplastic agent; antipyretic; apoptosis inducer; EC 1.14.99.1 (prostaglandin-endoperoxide synthase) inhibitor; non-narcotic analgesic; non-steroidal anti-inflammatory drug; prodrug; tocolytic agent |
| ah 001 | AH 001: structure given in first source; a melatonin agonist | ||
| opc 51803 | OPC 51803: a nonpeptide vasopressin V(2)-agonist; structure in first source | ||
| 4-phenyl-2-propionamidotetraline | 4-phenyl-2-propionamidotetraline: melatonin receptor antagonist; structure in first source | tetralins | |
| 2-phenylmelatonin | phenylindole | ||
| iik7 | IIK7: structure in first source | ||
| 5-methoxycarbonylamino-n-acetyltryptamine | 5-methoxycarbonylamino-N-acetyltryptamine: an mt1/MT2 receptor agonist | acetamides | |
| 8-methoxy-2-propionamidotetralin | 8-methoxy-2-propionamidotetralin: enhances sperm hyperactivation via the MT1 receptor | tetralins | |
| cholecalciferol | calciol : A hydroxy seco-steroid that is (5Z,7E)-9,10-secocholesta-5,7,10(19)-triene in which the pro-S hydrogen at position 3 has been replaced by a hydroxy group. It is the inactive form of vitamin D3, being hydroxylated in the liver to calcidiol (25-hydroxyvitamin D3), which is then further hydroxylated in the kidney to give calcitriol (1,25-dihydroxyvitamin D3), the active hormone. Cholecalciferol: Derivative of 7-dehydroxycholesterol formed by ULTRAVIOLET RAYS breaking of the C9-C10 bond. It differs from ERGOCALCIFEROL in having a single bond between C22 and C23 and lacking a methyl group at C24. | D3 vitamins; hydroxy seco-steroid; seco-cholestane; secondary alcohol; steroid hormone | geroprotector; human metabolite |
| atosiban | oligopeptide | ||
| deamino arginine vasopressin | Deamino Arginine Vasopressin: A synthetic analog of the pituitary hormone, ARGININE VASOPRESSIN. Its action is mediated by the VASOPRESSIN receptor V2. It has prolonged antidiuretic activity, but little pressor effects. It also modulates levels of circulating FACTOR VIII and VON WILLEBRAND FACTOR. | heterodetic cyclic peptide | diagnostic agent; renal agent; vasopressin receptor agonist |
| k 185 | |||
| l 372662 | L 372662: structure in first source | ||
| way-151932 | WAY-151932: structure in first source | ||
| ginkgolide b | |||
| dutasteride | dutasteride : An aza-steroid that is inasteride in which the tert-butyl group is replaced by a 2,5-bis(trifluoromethyl)phenyl group. A synthetic 4-azasteroid, dutasteride is a selective inhibitor of both the type 1 and type 2 isoforms of steroid 5alpha-reductase, an intracellular enzyme that converts testosterone to 5alpha-dihydrotestosterone. Dutasteride is used for the treatment of symptomatic benign prostatic hyperplasia in men with an enlarged prostate gland. Dutasteride: A 5-ALPHA-REDUCTASE INHIBITOR that is reported to inhibit both type-1 and type2 isoforms of the enzyme and is used to treat BENIGN PROSTATIC HYPERPLASIA. | (trifluoromethyl)benzenes; aza-steroid; delta-lactam | antihyperplasia drug; EC 1.3.1.22 [3-oxo-5alpha-steroid 4-dehydrogenase (NADP(+))] inhibitor |
| l 371257 | L 371257: structure given in first source | ||
| pmx 53 | |||
| vasopressin, 1-(1-mercaptocyclohexaneacetic acid)-2-(o- methyl-l-tyrosine)-8-l-arginine- | vasopressin, 1-(1-mercaptocyclohexaneacetic acid)-2-(O- methyl-L-tyrosine)-8-L-arginine-: highly potent antagonist of vasopressor response to arginine-vasopressin; structure in first source | ||
| l 368899 | |||
| ssr 149415 | |||
| bn 52020 | |||
| ucm 454 | |||
| 5-hydroxyethoxy-n-acetyltryptamine | 5-hydroxyethoxy-N-acetyltryptamine: structure in first source | ||
| regorafenib | (trifluoromethyl)benzenes; aromatic ether; monochlorobenzenes; monofluorobenzenes; phenylureas; pyridinecarboxamide | antineoplastic agent; hepatotoxic agent; tyrosine kinase inhibitor | |
| gsk221149a | GSK221149A: highly selective oxytocin receptor antagonist; structure in first source | dipeptide | |
| epelsiban | epelsiban: structure in first source | dipeptide | |
| carbetocin | carbetocin : Oxytocin in which the hydrogen on the phenolic hydroxy group is substituted by methyl, the amino group on the cysteine residue is substituted by hydrogen, and the sulfur of the cysteine residue is replaced by a methylene group. A synthetic carba-analogue of oxytocin, it is used to control bleeding after giving birth. Like oxytocin, it causes contraction of the uterus. | heterodetic cyclic peptide | oxytocic |
| nitd 609 | NITD 609: an antimalarial and coccidiostat; structure in first source | ||
| obe001 | OBE001: an oxytocin receptor antagonist | ||
| (6-chloro-1-(2-(dimethylamino)ethyl)indol-3-yl)-spiro(1h-isobenzofuran-3,4'-piperidine)-1'-yl-methanone | (6-chloro-1-(2-(dimethylamino)ethyl)indol-3-yl)-spiro(1H-isobenzofuran-3,4'-piperidine)-1'-yl-methanone: a vasopressin 1a receptor antagonist; structure in first source | ||
| way 267464 |