Effects of a Specific and Long-Acting Renin Inhibitor in the Marmoset

• Published in: Hypertension (Dallas, Tex. 1979) Tex. 1979), 1985-09, Vol.7 (5), p.797-803
• Main Authors: WOOD, JEANETTE M, GULATI, NEELAM, FORGIARINI, PETER, FUHRER, WALTER, HOFBAUER, KARL G
• Format: Article
• Language: English
• Subjects: Animals; Blood Pressure - drug effects; Callithrix - physiology; Callitrichinae - physiology; Dogs; Furosemide - pharmacology; Heart Rate - drug effects; Humans; Kidney - physiology; Male; Oligopeptides; Rats; Renin - antagonists & inhibitors; Renin - blood; Renin - pharmacology; Species Specificity
• ISSN: 0194-911X; 1524-4563
• DOI: 10.1161/01.hyp.7.5.797

Inhibition of renin was induced in conscious marmosets with CGP 29 287, Z- Arg-Arg-Pro-Phe-His-Sta-Ile-Hls-Lys (Boc) -OMe, a renin inhibitor with a prolonged duration of action. In vitro, CGP 29 287 is a potent inhibitor of primate plasma renin (inhibitory concentration, 50%human = 1 × 10M; marmoset = 5 × 10M) and less potent against dog (2 × 10M) orrat (3 × 10M) plasma renin. CGP 29 287 is a weak inhibitor of other aspartic proteases such as porcine pepsin or bovine cathepsin D (inhibitory concentration, 50% = 4 × 10M). In furosemide-treated marmosets, CGP 29 287 lowered blood pressure and inhibited plasma renin activity during intravenous infusion and after intravenous bolus injection. The duration of action after intravenous injection was dose dependent and ranged from 1 hour after 0.1 mg/kg to more than 3 hours after 10 mg/kg. High doses of CGP 29 287 (100 mg/kg) were active after oral administration. In all experiments a close relation between inhibition of plasma renin activity and reduction of blood pressure was found. A maximum hypotensive response to CGP 29 287 was associated with complete inhibition of plasma renin activity, and the recovery of blood pressure was accompanied by recovery of plasma renin activity. The hypotensive effects of CGP 29 287 were smaller in untreated than in furosemide-treated marmosets. CGP 29 287 had no influence on blood pressure in marmosets after bilateral nephrectomy or after pretreatment with a converting enzyme inhibitor. CGP 29 287 did not affect the pressor responses to exogenous angiotensin I or angiotensin II. These results indicate that CGP 29 287 is a potent and specific inhibitor of primate renin. In furosemide-treated marmosets CGP 29 287 induced a long-lasting reduction in blood pressure that appears to be entirely due to inhibition of renin.