PMID: 6986224Jan 1, 1980Paper

Vasodepressor property of the converting enzyme inhibitor captopril (SQ 14 225): the role of factors other than renin-angiotensin blockade in the rat

Clinical Science
E S MarksJ D Swales


1. The peptide converting enzyme inhibitor captopril was given (1.25 mg/kg intravenously) to normal and nephrectomized rats and rats with renovascular and deoxycorticosterone hypertension. 2. Captopril lowered blood pressure to a small extent in normal and nephrectomized rats. Bradykinin infusion in nephrectomized animals, however, potentiated the vasodepressor action of captopril. 3. Captopril produced a major blood pressure fall in the early stages of Goldblatt two-kidney one-clip hypertension: even when hypertension had been present for more than 4 months, a substantial vasodepressor action was seen. Rats with deoxycorticosterone-induced hypertension also showed a significant blood pressure fall. 4. Captopril was given to salt-loaded and salt-depleted rats in which the renin-angiotensin system had been blocked by infusion of the competitive angiotensin II antagonist saralasin. Captopril still lowered blood pressure in the salt-depleted group. 5. Captopril lowers blood pressure in situations where the renin-angiotensin system is not responsible for blood pressure maintenance. Further, the fall in blood pressure produced in Goldblatt two-kidney one-clip hypertension is greater than would be predicted on the basis of renin-angi...Continue Reading


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