Abstract

SQ 14, 225, a new angiotensin-converting enzyme inhibitor, attenuated the vascular contraction induced by norepinephrine in the perfused rat mesenteric vascular bed, while SQ 20, 881, an another converting enzyme inhibitor, did not have any effect on the vascular reactivity. Furthermore, this effect of SQ 14, 225 was not altered in the presence of bradykinin or angiotensin II in the perfusate. These results suggest that SQ 14, 225 may have a direct antihypertensive effect which is not mediated by the inhibition of angiotensin-converting enzyme.

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