Cardiorenal protective effects of vasopeptidase inhibition with omapatrilat in hypertensive transgenic (mREN-2)27 rats.

Abstract

Vasopeptidase inhibitors simultaneously inhibit both angiotensin-converting enzyme (ACE) and neutral endopeptidase (NEP). The aim of this study was to determine the cardiorenal effects of the vasopeptidase inhibitor omapatrilat in the transgenic m(Ren-2)27 rat which exhibits fulminant hypertension and severe organ pathology. At 6 weeks of age, male Ren-2 rats were randomized to receive no treatment (N = 10), the ACE inhibitor fosinopril 10 mg/kg/day (N = 10), or omapatrilat 10 mg/kg/day (N = 10) or 40 mg/kg/day (N = 10) by daily gavage for 24 weeks. Various cardiorenal functional and structural parameters were assessed. Compared to controls, all treatment groups reduced hypertension in control Ren-2 rats, with both doses of omapatrilat reducing systolic blood pressure significantly more than fosinopril (control, 178 +/- 3 mmHg; fosinopril 10 mg/kg/day, 130 +/- 4 mmHg; omapatrilat 10 mg/kg/day, 110 +/- 3 mmHg; omapatrilat 40 mg/kg/day, 91 +/- 3 mmHg). Omapatrilat dose-dependently reduced cardiac hypertrophy, caused a greater inhibition of renal ACE than fosinopril, and was the only treatment to inhibit renal NEP. Attenuation of albuminuria, glomerulosclerosis and cardiorenal fibrosis occurred to a similar degree with omapatrilat and fosinopril. Omapatrilat confers cardiorenal protection in the hypertensive Ren-2 rat. Although inhibition of tissue NEP may contribute to the superior blood pressure reduction by omapatrilat, overall, the results are consistent with the central role that angiotensin II plays in renal and cardiac fibrosis in this model of hypertension.

• Authors: Sally A Mifsud, Louise M Burrell, Eiji Kubota, Kassie Jaworski, Mark E Cooper, Jennifer L Wilkinson-Berka
• Journal: Clinical and experimental hypertension (New York, N.Y. : 1993) (Clin Exp Hypertens) Vol. 26 Issue 1 Pg. 69-80 (Jan 2004) ISSN: 1064-1963 [Print] England
• PMID: 15000298 (Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Angiotensin-Converting Enzyme Inhibitors
• Antihypertensive Agents
• Biomarkers
• Pyridines
• Thiazepines
• omapatrilat
• Atrial Natriuretic Factor
• Renin
• Neprilysin
• Fosinopril

Topics

• Angiotensin-Converting Enzyme Inhibitors (administration & dosage, adverse effects)
• Animals
• Animals, Genetically Modified
• Antihypertensive Agents (administration & dosage, adverse effects)
• Atrial Natriuretic Factor (blood, metabolism)
• Biomarkers (blood)
• Blood Pressure (drug effects)
• Body Weight (drug effects)
• Cardiomegaly (drug therapy, enzymology, mortality)
• Disease Models, Animal
• Dose-Response Relationship, Drug
• Fosinopril (administration & dosage, adverse effects)
• Hypertension (drug therapy, enzymology, mortality)
• Kidney (drug effects, enzymology, pathology)
• Male
• Models, Cardiovascular
• Neprilysin (drug effects)
• Pyridines (administration & dosage, adverse effects)
• Rats (genetics)
• Renin (blood, drug effects)
• Statistics as Topic
• Survival Analysis
• Systole (drug effects)
• Thiazepines (administration & dosage, adverse effects)
• Time Factors
• Treatment Outcome