PMID: 2857614Jan 1, 1985Paper

Studies of alpha 2-adrenoceptor antagonist potency in vitro: comparisons in tissues from rats, rabbits, dogs and humans

Clinical Science
J F WaterfallN Lattimer

Abstract

The potencies of a number of selective alpha 2-adrenoceptor antagonists have been measured in preparations from four species. In the rat vas deferens, the newer synthetic antagonists Wy 25309, Wy 26392, Wy 26703 and RX 781094 were more potent than the alkaloid yohimbine in blocking a clonidine-induced inhibition of an electrically evoked twitch response. In the rabbit vas deferens yohimbine was substantially more potent than the synthetic antagonists in reversing the action of clonidine. Yohimbine was also more potent than the synthetic antagonists in blocking the B-HT 933-induced contractile responses of the dog saphenous vein and preventing adrenaline-induced aggregation of human platelets. Together with previously published data derived from tritium overflow studies on rabbit pulmonary arteries and displacement of [3H]-rauwolscine binding from rat cerebral cortex and human platelets, the results suggest that the adrenoceptor currently labelled alpha 2 may not be a single entity.

Citations

Oct 1, 1987·Naunyn-Schmiedeberg's Archives of Pharmacology·R R RuffoloJ P Hieble
Oct 1, 1989·Medicinal Research Reviews·J C McGrathV G Wilson
Dec 1, 1986·British Journal of Clinical Pharmacology·C A Hamilton, J L Reid
Jan 1, 1994·Pharmacology & Therapeutics·R R Ruffolo, J P Hieble
Jan 1, 1993·General Pharmacology·P Alberts
Jan 29, 1986·European Journal of Pharmacology·K E DickinsonP S Sever

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