An orally active inhibitor of renin.
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| Abstract |
A potent renin inhibitor, U-71038 (Boc-Pro-Phe-N-MeHis-Leu psi[CHOHCH2]Val-Ile-Amp), was tested for oral effectiveness. Enzyme kinetic studies indicated that U-71038 was a competitive inhibitor of hog renin with an inhibitor constant (Ki) value of 12 nM. Intravenous as well as oral administration of U-71038 to anesthetized, ganglion-blocked rats infused with hog renin elicited dose-related hypotensive responses. Intravenous administration of U-71038 to conscious, sodium-depleted monkeys caused dose-related decreases of blood pressure and plasma renin activity without affecting heart rate. Similarly, the oral administration of U-71038 at 50 mg/kg to conscious, sodium-depleted monkeys elicited a pronounced hypotension and decrease in plasma renin activity that persisted for 5 hours. The hypotensive responses elicited by intravenous and oral administration of U-71038 to hog renin-infused rats and sodium-depleted monkeys were shown to be due entirely to inhibition of the renin-angiotensin system. A comparison of the results obtained after the intravenous administration of U-71038 with the results obtained after the oral administration of U-71038 implied that at least 10% of the orally administered U-71038 must have been absorbed to cause the observed effects in hog renin-infused rats and sodium-depleted monkeys. The studies demonstrated that an inhibitor of renin with a long duration of action and with oral effectiveness is a feasible entity.
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| Authors | D T Pals, S Thaisrivongs, J A Lawson, W M Kati, S R Turner, G L DeGraaf, D W Harris, G A Johnson |
| Journal | Hypertension (Dallas, Tex. : 1979) (Hypertension) Vol. 8 Issue 12 Pg. 1105-12 (Dec 1986) ISSN: 0194-911X [Print] United States |
| PMID | 3539793 (Publication Type: Journal Article) |
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