Discrimination between peripheral and central alpha-adrenergic effects using meta-substituted imidazolidines

European Journal of Pharmacology
A de JongeP A van Zwieten

Abstract

meta-Substituted 2-chlorophenyl(imino)imidazolidines of the clonidine-type (2,3- and 2,5-substituted derivatives) were used in attempts to discriminate between alpha-adrenergic effects (central hypotensive and peripheral hypertensive activities) in rats. The central hypotensive activity of four pairs of substitution isomers was expressed as a pC20, calculated from log dose-response curves after i.v. administration of the compounds to anaesthetized, normotensive rats. Peripheral hypertensive potency was evaluated in pithed normotensive rats following i.v. injections and quantified by means of pC60. The partition coefficients of the drugs were determined in an octanol/aqueous buffer (pH 7.4, 37 degrees C) system as a measure of lipophilic behaviour. The pressor activities in rats were comparable within each pair of substitution isomers whereas the depressor potencies differed greatly, although the representatives within each pair displayed similar lipophilicity. Regression analysis showed that the central hypotensive activity was governed by the steric bulk of the 5-substituent. On the other hand, this feature did not affect the peripheral hypertensive potency. The discrepancy between central and peripheral alpha-adrenergic activ...Continue Reading

References

Aug 1, 1976·Journal of Medicinal Chemistry·B RouotC G Wermuth
Sep 1, 1977·Life Sciences·S Berthelsen, W A Pettinger
Oct 1, 1979·British Journal of Pharmacology·G M Drew, S B Whiting
Oct 1, 1977·European Journal of Pharmacology·P B Timmermans, P A Van Zwieten
Dec 1, 1979·Naunyn-Schmiedeberg's Archives of Pharmacology·P B TimmermansP A van Zwieten
Nov 1, 1974·Clinical and Experimental Pharmacology & Physiology·D BogaievskyH Schmitt
Sep 1, 1974·Life Sciences·H S BoudierJ van Rossum
Aug 1, 1980·Naunyn-Schmiedeberg's Archives of Pharmacology·P B Timmermans, P A van Zwieten

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