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• W2116777719 abstract "Vasoconstriction of carotid arteriovenous anastomoses may be involved in the therapeutic action of acutely acting antimigraine agents, including the triptans and ergot alkaloids. While 5-HT1B/1D receptors mediate the effect of triptans, ergotamine and dihydroergotamine also interact with α-adrenoceptors. In the present study, we investigated the potential role of α1- and α2-adrenoceptors in mediating vasoconstriction of carotid arteriovenous anastomoses in anaesthetized pigs. Ten minute intracarotid infusions of phenylephrine (1, 3 and 10 μg kg−1 min−1) or BHT 933 (3, 10 and 30 μg kg−1 min−1) produced dose-dependent decreases in total carotid and arteriovenous anastomotic conductances; no changes were observed in the capillary fraction. The carotid vascular effects of phenylephrine and BHT 933 were selectively abolished by prazosin (100 μg kg−1, i.v.) and rauwolscine (300 μg kg−1, i.v.), respectively. The responses to phenylephrine and BHT 933 were not affected by the selective 5-HT1B/1D receptor antagonist GR127935 (500 μg kg−1, i.v.). These results show that both α1- and α2-adrenoceptors can mediate vasoconstriction of carotid arteriovenous anastomoses in anaesthetized pigs. Since vasoconstrictor activity in this in vivo model is predictive of anti-migraine activity, an agonist activity at particularly the α2-adrenoceptor subtypes, in view of their less ubiquitous nature, could provide migraine abortive potential. Thus, the present results may aid further understanding of the mode of action of some current anti-migraine agents and may eventually be helpful in the development of future treatment in migraine. British Journal of Pharmacology (1999) 127, 1263–1271; doi:10.1038/sj.bjp.0702655" @default.
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• W2116777719 date "1999-07-01" @default.
• W2116777719 modified "2023-10-16" @default.
• W2116777719 title "Pharmacological evidence that α₁ - and α₂ -adrenoceptors mediate vasoconstriction of carotid arteriovenous anastomoses in anaesthetized pigs" @default.
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• W2116777719 doi "https://doi.org/10.1038/sj.bjp.0702655" @default.
• W2116777719 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1566127" @default.
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