Abstract

Bradykinin induced relaxation and cyclic GMP accumulation in both bovine intrapulmonary artery and vein. Both the relaxant responses and the accompanying cyclic GMP accumulations were abolished or markedly reduced by intimal rubbing or pretreatment with the guanylate cyclase inhibitor, methylene blue. These findings indicate that both bovine intrapulmonary artery and vein exhibit endothelium-dependent relaxation in response to bradykinin, and that the relaxant responses in both vessels are associated with cyclic GMP accumulation.

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