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Methods and Findings
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Methods Find Exp Clin Pharmacol 2000, 22(3): 145
ISSN 0379-0355
Copyright 2000 Clarivate
CCC: 0379-0355
Interactions between phenylephrine, clonidine and xylazine in rat and rabbit aortas
Atalik K.E., Sahin, A.S., Dogan, N.
The interaction of the alpha2-adrenoceptor agonists clonidine and xylazine with the alpha1-adrenoceptors in the rat and rabbit aortas was investigated. In preparations preconstricted with phenylephrine (10exp(-6) M), cumulative addition of clonidine and xylazine induced concentration-related vasodilatation in the presence of the alpha2-adrenoceptor antagonist yohimbine and the beta-blocker propranolol. Neither clonidine nor xylazine treatment inhibited 5-HT- and KCl-induced vasoconstriction. It is concluded that alpha2-agonists have affinity for alpha1-adrenoceptors in rat and rabbit aortas.

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