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Br J Pharmacol. 1993 Sep; 110(1): 151–158.
PMCID: PMC2175976

Involvement of nitric oxide in the endothelium-dependent relaxation induced by hydrogen peroxide in the rabbit aorta.


1. The effects of hydrogen peroxide (H2O2, 0.1-1 mM) on the tone of the rings of rabbit aorta precontracted with phenylephrine (0.2-0.3 microM) were studied. 2. H2O2 induced a concentration-dependent relaxation of both the intact and endothelium-denuded rings. However, in the presence of intact endothelium, H2O2-induced responses were 2-3 fold larger than in its absence, demonstrating the existence of endothelium-independent and endothelium-dependent components of the vasorelaxant action of H2O2. 3. The endothelium-dependent component of H2O2-induced relaxation was prevented by NG-nitro-L-arginine methyl ester (L-NAME, 30 microM) or NG-monomethyl-L-arginine (300 microM), inhibitors of nitric oxide synthase (NOS), in a manner that was reversible by L-, but not by D-arginine (2mM). The inhibitors of NOS did not affect the responses of denuded rings. 4. Methylene blue (10 microM), an inhibitor of soluble guanylate cyclase, blocked H2O2-induced relaxation of both the intact and denuded rings. 5. H2O2 (1 mM) enhanced the efflux of cyclic GMP from both the endothelium-intact and denuded rings. The effect of H2O2 was 4 fold greater in the presence of intact endothelium and this endothelium-dependent component was abolished after the inhibition of NOS by L-NAME (30 microM). 6. In contrast to the effects of H2O2, the vasorelaxant action of stable organic peroxides, tert-butyl hydroperoxide or cumene hydroperoxide, did not have an endothelium-dependent component. Moreover, they did not potentiate the efflux of cyclic GMP from the rings of rabbit aorta.(ABSTRACT TRUNCATED AT 250 WORDS)

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