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Hypertension, Vol 21, 921-924, Copyright © 1993 by American Heart Association

ARTICLES

Captopril inhibits endothelin-1 secretion from endothelial cells through bradykinin

N Momose, K Fukuo, S Morimoto and T Ogihara
Department of Geriatric Medicine, Osaka University Medical School Japan.

Incubation with captopril, an angiotensin I converting enzyme inhibitor, for 24 hours at concentrations up to 10(-7) M inhibited endothelin-1 secretion by endothelial cells. This inhibition of endothelin-1 secretion was reversed by coincubation with 3 x 10(-3) M NG-nitro-L-arginine, an inhibitor of nitric oxide synthesis. Furthermore, captopril enhanced the production of nitric oxide in endothelial cells, suggesting that enhancement of nitric oxide production participates in captopril-induced inhibition of endothelin-1 secretion. Moreover, in the presence of 10(-6) M D-Arg,[Hyp3,Thi5,8,D- Phe7]-bradykinin, a bradykinin B2 receptor antagonist, captopril did not inhibit but rather stimulated endothelin-1 secretion, whereas bradykinin inhibited endothelin-1 secretion, and this inhibition by bradykinin was reversed by coincubation with NG-nitro-L-arginine. In addition, enhancement of nitric oxide production induced by either captopril or bradykinin was inhibited by D-Arg,[Hyp3,Thi5,8,D-Phe7]- bradykinin. Although 10(-6) M des-Arg9-[Leu8]-bradykinin, a bradykinin B1 receptor antagonist, did not affect nitric oxide production by bradykinin, it enhanced the inhibition of endothelin-1 secretion by bradykinin. Furthermore, 10(-7) M des-Arg9-bradykinin, a bradykinin B1 receptor agonist, stimulated endothelin-1 secretion by endothelial cells. These findings suggest that angiotensin I converting enzyme inhibitor inhibits endothelin-1 secretion by the accumulation of endogenous bradykinin in endothelial cells and that the inhibition of endothelin-1 secretion by bradykinin is mediated via B2 receptors.

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