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

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