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- W2040236388 abstract "Abstract The inhibitory effects of (+)- and (-)-verapamil on the hypertensive responses brought about by the α2-adrenoceptor agonist B-HT 920 were investigated in pithed normotensive rats. (-)-Verapamil was found to be about 4 times more potent with respect to depressing α2-pressor responses compared with (+)-verapamil. To rule out the effect of ‘unspecific’ vasodilatation after the administration of the stereoisomers of verapamil, vasopressin was continuously infused into the carotid artery of pithed rats in a separate series of experiments. In the course of this vasopressin infusion, new inhibitory activities of the stereoisomers of verapamil on α2–adrenoceptor-mediated pressor responses were determined. Under these circumstances, the potency ratio of (-)- vs (+)-verapamil was about 7. With the aid of a radioligand binding assay using [3H]clonidine to identify α2–adrenoceptors, low affinities were measured for the stereoisomers of verapamil. A Ki = 6170 nM for (-)-verapamil and a Ki = 41700 nM for (+)-verapamil were calculated. The results indicate that the interaction between α2-adrenoceptor-mediated pressor responses and calcium entry blockers, such as verapamil, is a stereoselective event." @default.
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- W2040236388 date "1983-08-01" @default.
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- W2040236388 title "Differential inhibition of α2-adrenoceptor-mediated pressor responses by (+)- and (-)-verapamil in pithed rats" @default.
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- W2040236388 doi "https://doi.org/10.1111/j.2042-7158.1983.tb04818.x" @default.
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