Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UNIPROT:P08908 (5-HT1A)
 5,574 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

5-Hydroxytryptamine (5-HT) reduces porcine arteriovenous shunting in the carotid vascular bed by stimulation of both 5-HT1-like and 5-HT2 receptors and increases capillary flow to some tissues, like the skin and ears, by different 5-HT1-like receptors. In view of the heterogeneous nature of the 5-HT1-like receptors and the relative selectivity for the 5-HT1D binding sites of sumatriptan, which also reduces porcine arteriovenous shunting and slightly increases capillary blood flow towards skin and ears by 5-HT1-like receptors, we have attempted to determine whether one or both of these carotid 5-HT1-like receptors belong to the 5-HT1D subtype. Pentobarbitone anaesthetized pigs, subjected to bilateral cervical vagosympathectomy, received either 5-HT (2 micrograms.kg-1.min-1) in the carotid artery or cumulative i.v. doses of sumatriptan (10, 30, 100 and 300 micrograms.kg-1). Their effect on the total carotid blood flow and its distribution into capillary and arteriovenous anastomotic parts was determined with radioactive microspheres. The effect of metergoline (1 mg.kg-1), a substance with a very high affinity for the 5-HT1D receptor as well as for the 5-HT1A, 5-HT1B, 5-HT1C and 5-HT2 receptors, was studied on the responses to 5-HT and sumatriptan. Both 5-HT and sumatriptan reduced carotid arteriovenous anastomotic blood flow. 5-HT and, to a lesser extent, sumatriptan also increased capillary blood flow towards some tissues. Metergoline by itself did not affect the distribution of porcine carotid blood flow.(ABSTRACT TRUNCATED AT 250 WORDS)
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PMID:5-HT1-like receptor mediated changes in porcine carotid haemodynamics: are 5-HT1D receptors involved? 132 17

Ditolyguanidine (DTG) induced a dose-dependent emetic response in pigeons, with 100% of the birds vomiting after 5.6 mg/kg. Retching and vomiting originally induced by DTG could be conditioned to the test situation. Both the unconditioned and conditioned emetic responses were dose-dependently blocked by 8-hydroxy-(di-n-propylamino)tetralin (8-OH-DPAT) and LY228729, agonists at the 5-HT1A subtype of serotonin receptor, but not by the 5-HT3, antagonist tropisetron. Higher doses (0.25-0.5 mg/kg) of tropisetron exhibited intrinsic emetic activity which could also be prevented by 8-OH-DPAT. NAN-190, a putative 5-HT1A partial agonist, produced both an antiemetic response when administered before DTG and also attenuated the antiemetic effects of 8-OH-DPAT. Pentobarbital blocked the conditioned, but not the unconditioned DTG-induced emesis. These results support the possibility that 5-HT1A agonists exhibit antiemetic activity against a broad range of emetic stimuli, including conditioned vomiting which is usually resistant to pharmacological attenuation.
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PMID:Antiemetic effects of 5-HT1A agonists in the pigeon. 782 54

Serotonin (5-HT) is generally considered to serve a facilitatory role in the regulation of adrenocortical secretion. Numerous studies have shown that administration of 5-HT1A receptor agonists increases plasma corticosterone (CS) concentrations in rats; however, the mechanism has not been established. Rats were prepared with a cannula implanted above the lateral cerebral ventricle, or bilateral cannulae above the hypothalamic paraventricular nuclei (PVN), the site of the perikarya of corticotropin-releasing factor (CRF)-secreting neurons regulating adrenocortical secretion. In sodium pentobarbital-anesthetized rats, intracerebroventricular and intra-PVN administration of 5-HT resulted in a multi-component dose-response curve in plasma CS, whereas administration of 5-HT in conscious animals resulted in low-dose inhibition and higher dose elevation of plasma CS levels. Under pentobarbital anesthesia, central administration of the selective 5-HT1A agonists, 8-hydroxy-2-(di-n-propylamino)tetralin (8-OH-DPAT) and ipsapirone decreased plasma CS levels, relative to saline-treated control rats, at all doses tested (0.001-20 nmol). In conscious rats, administration of 8-OH-DPAT decreased adrenocortical secretion at lower doses and significantly increased plasma CS concentrations at higher doses. Ipsapirone produced similar but less pronounced effects. In contrast, intraperitoneal injection of 8-OH-DPAT (2 mumol/kg) increased plasma CS concentrations, but this was not prevented by prior intracerebroventricular administration of the 5-HT1A antagonist, NAN-190 (5 nmol). Pentobarbital anesthesia completely blocked the plasma CS response to peripheral administration of 8-OH-DPAT. In view of the adrenocortical activating effects of hypotensive stimuli, we speculate that the well-documented hemodynamic changes following 5-HT1A receptor stimulation may be responsible for the adrenocortical responses observed. Our data demonstrate that low doses of 5-HT1A agonists delivered directly into the CNS decrease adrenocortical secretion. Since intra-PVN injections of 8-OH-DPAT to pentobarbital-anesthetized rats also decreased hypothalamo-pituitary-adrenocortical activity, it appears that a component of the inhibitory effect of 5-HT1A receptor activation is mediated by a direct effect at the level of the PVN, and presumably involves CRF-secreting neurons.
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PMID:Central 5-HT1A receptors inhibit adrenocortical secretion. 851 Aug 3