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Vol. 61, Issue 2, 294-302, February 2002

The Possible Implication of trans-Resveratrol in the Cardioprotective Effects of Long-Term Moderate Wine Consumption

Francisco Orallo, Ezequiel Álvarez, Mercedes Camiña, José Manuel Leiro, Eva Gómez, and Pilar Fernández

Departamentos de Farmacología (F.O., E.Á., M.C.) y Microbiología y Parasitología (J.M.L.), Facultad de Farmacia; Departamento de Farmacología, Facultad de Medicina y Odontología (E.G., P.F.), Universidad de Santiago de Compostela, Santiago de Compostela (La Coruña), España

trans-Resveratrol (t-RESV; 1-10 µM), a phenolic component of wines, had no effect on phenylephrine-(PE; 1 µM) and high KCl-(60 mM) induced contractions in endothelium-denuded rat aortic rings. However, it relaxed the contractile response produced by these vasoconstrictor agents in intact rat aorta. The vasorelaxing effects of t-RESV were completely inhibited by NG-nitro-L-arginine (L-NOARG; 0.1 mM) and methylene blue (10 µM), but they were unaffected by atropine (10 µM) and yohimbine (1 µM). The reversal effect produced by L-NOARG was antagonized by L-arginine but not by D-arginine (0.1 mM). t-RESV (1-10 µM) did not significantly modify rat aorta constitutive nitric-oxide synthase activity. However, this natural compound decreased NADH/NADPH oxidase activity in rat aortic homogenates. In addition, t-RESV (1-10 µM) was ineffective in scavenging superoxide anions (O2&cjs1138;) generated enzymatically by a hypoxanthine/xanthine oxidase (HX/XO) system and/or to inhibit XO. The above data demonstrate that the characteristic endothelium-dependent vasorelaxant effect of t-RESV in rat aorta seems to be caused by the inhibition of vascular NADH/NADPH oxidase and the subsequent decrease of basal cellular O2&cjs1138; generation and, therefore, of NO biotransformation. Under the assumption that t-RESV exhibits a similar behavior in human blood vessels and bearing in mind that an overactivity of NADH/NADPH oxidase has been found in a number of cardiovascular pathologies, the results obtained in this work suggest that t-RESV could play an important role in the cardioprotective effects induced by the long-term moderate wine consumption.


Copyright © 2002 by The American Society for Pharmacology and Experimental Therapeutics



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