Abstract
A structure-activity analysis of peptides containing backbone C alpha-methyl modification at the P4 site of the angiotensinogen sequence led to the discovery of potent renin inhibitors with apparent in vitro metabolic stability. Boc-alpha-MePro-Phe-His-Leu psi[CHOHCH2]Val-Ile-Amp dicitrate (Va) is a potent inhibitor of human plasma renin with an IC50 value of 1.8 nM. This peptide was shown not to be degraded in vitro by chymotrypsin, elastase, pepsin, and a rat liver homogenate preparation. It is also a potent inhibitor of hog renin with an IC50 value of 1.6 nM and was shown to elicit in vivo activity and cause dose-dependent hypotensive responses when given intravenously to anesthetized ganglion-blocked, hog renin infused rats.
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