(Hypertension. 1999;33:232-237.)
© 1999 American Heart Association, Inc.
Scientific Contribution |
Role of Aldosterone in Renal Vascular Injury in Stroke-Prone Hypertensive Rats
Correspondence to Charles T. Stier, Jr., PhD, Department of Pharmacology, Basic Science Building, New York Medical College, Valhalla, NY 10595. E-mail Charles_Stier{at}NYMC.edu
Abstract—Stroke-prone spontaneously hypertensive rats (SHRSP) on 1% NaCl drinking solution and Stroke-Prone Rodent Diet develop severe hypertension and glomerular and vascular lesions characteristic of thrombotic microangiopathy seen in malignant nephrosclerosis. We recently reported that spironolactone, a mineralocorticoid receptor antagonist, markedly reduced proteinuria and malignant nephrosclerotic lesions in these animals. This observation, together with our previous findings that angiotensin-converting enzyme inhibitors prevent the development of vascular damage, suggests that mineralocorticoids, as part of the renin-angiotensin-aldosterone system, play a pathophysiological role in this model. In the present study, we examined whether chronic (2-week) infusion of aldosterone can reverse the renal vascular protective effects of captopril in SHRSP. SHRSP received vehicle (n=8); captopril alone (50 mg · kg-1 · d-1, orally) (n=10); aldosterone infusion alone (40 µg · kg-1 · d-1, SC) (n=7); or captopril and aldosterone at 20 (n=6) or 40 (n=7) µg · kg-1 · d-1. Systolic blood pressure was markedly elevated in all groups. Vehicle- and aldosterone-infused SHRSP developed severe proteinuria and comparable degrees of renal injury (21±3% and 29±3%, respectively) manifested as thrombotic and proliferative lesions in the arterioles and glomeruli. Captopril treatment reduced plasma aldosterone levels concomitant with marked reductions in proteinuria and the absence of histologic lesions of malignant nephrosclerosis. Aldosterone substitution at 20 or 40 µg · kg-1 · d-1 in captopril-treated SHRSP resulted in the development of severe renal lesions (16±3% and 21±2%, respectively) and proteinuria comparable with that observed in SHRSP given either aldosterone or vehicle alone. These findings support a major role for aldosterone in the development of malignant nephrosclerosis in saline-drinking SHRSP, independent of the effects of blood pressure.
Key Words: hypertension • kidney • malignant nephrosclerosis • captopril • aldosterone
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