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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Rabelo, G. Saxena, P. Centurión, D. De Vries, P. Sánchez-lópez, A. Villalón, C. M. |
| Description | Author Affiliation: Villalón CM ( Departamento de Farmacología y Toxicologia, CINVESTAV, I.P.N., México D.F., México. carlos_villalon@infosel.net.mx) |
| Abstract | The antimigraine drugs methysergide, ergotamine and dihydroergotamine (DHE) produce selective vasoconstriction in the external carotid bed of vagosympathectomized dogs anaesthetized with pentobarbital and artificially respired, but the receptors involved have not yet been completely characterized. Since the above drugs display affinity for several binding sites, including alpha-adrenoceptors and several 5-HT1 and 5-HT2 receptor subtypes, this study has analysed the mechanisms involved in the above responses. Intracarotid (i.c.) infusions during 1 min of methysergide (31-310 microg min(-1)), ergotamine (0.56-5.6 microg min(-1)) or DHE (5.6-31 microg min(-1)) dose-dependently reduced external carotid blood flow (ECBF) by up to 46+/-4, 37+/-4 and 49+/-5%, respectively. Blood pressure and heart rate remained unchanged. The reductions in ECBF by methysergide were abolished and even reversed to increases in animals pre-treated with GR127935 (10 microg kg(-1), i.v.). The reductions in ECBF by ergotamine and DHE remained unchanged in animals pre-treated (i.v.) with prazosin (300 microg kg(-1)), but were partly antagonized in animals pre-treated with either GR127935 (10 or 30 microg kg(-1)) or yohimbine (1000 microg kg(-1)). Pre-treatment with a combination of GR127935 (30 microg kg(-1)) and yohimbine (1000 microg kg(-1)) abolished the responses to both ergotamine and DHE. The above doses of antagonists were shown to produce selective antagonism at their respective receptors. These results suggest that the external carotid vasoconstrictor responses to methysergide primarily involve 5-HT1B/1D receptors, whereas those to ergotamine and DHE are mediated by 5-HT1B/1D receptors as well as alpha2-adrenoceptors. |
| ISSN | 00071188 |
| e-ISSN | 14765381 |
| Journal | British Journal of Pharmacology |
| Issue Number | 3 |
| Volume Number | 126 |
| Language | English |
| Publisher | Wiley Online Library(on behalf of The British Pharmacological Society) |
| Publisher Date | 1999-02-01 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | Open |
| Subject Keyword | Carotid Arteries Drug Effects Vasoconstriction Vasoconstrictor Agents Pharmacology Adrenergic Alpha-1 Receptor Antagonists Adrenergic Alpha-2 Receptor Agonists Adrenergic Alpha-2 Receptor Antagonists Adrenergic Alpha-Agonists Adrenergic Alpha-Antagonists Animals Blood Flow Velocity Physiology Clonidine Dihydroergotamine Ergotamine Hemodynamics Methysergide Oxadiazoles Phenylephrine Piperazines Prazosin Receptor, Serotonin, 5-HT1B Receptor, Serotonin, 5-HT1D Receptors, Adrenergic, Alpha-2 Receptors, Serotonin Serotonin Antagonists Sumatriptan Yohimbine Research Support, Non-U.S. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Pharmacology |
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