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Hypertension, Vol 22, 237-242, Copyright © 1993 by American Heart Association

ARTICLES

Renal nitric oxide and angiotensin II interaction in renovascular hypertension

DH Sigmon and WH Beierwaltes
Hypertension and Vascular Research Division, Henry Ford Hospital, Detroit, Mich. 48202-2689.

In two-kidney, one clip (2K1C) renovascular hypertension, blood flow is reduced to the clipped but not to the nonclipped kidney, despite elevated angiotensin II. To determine possible interactions between endothelium-derived nitric oxide and angiotensin, we studied bilateral renal blood flow using radioactive microspheres in anesthetized 2K1C hypertensive rats 4 weeks after clipping. We studied the response to nitric oxide synthesis inhibition with 10 mg/kg body wt NG-nitro-L- arginine- methyl ester (L-NAME) in hypertensive rats untreated (n = 5) or treated (n = 5) with 10 mg/kg body wt of the angiotensin II antagonist losartan. 2K1C rats had a blood pressure of 159 +/- 9 mm Hg, and renal blood flow to the clipped kidney was reduced 87% compared with the nonclipped kidney. L-NAME increased blood pressure 36 +/- 5 mm Hg and decreased renal blood flow in the nonclipped kidney 61% (4.9 +/- 0.5 to 1.9 +/- 0.4 mL/min per gram kidney weight, P < .001). Renal vascular resistance increased 200% (33.4 +/- 2.2 to 100.7 +/- 15.0 resistance units [RU], P < .005). Renal blood flow and resistance in the clipped kidney were unchanged by L-NAME. Treatment of 2K1C rats with losartan reduced blood pressure (154 +/- 8 to 116 +/- 11 mm Hg, P < .01), did not change blood flow in the nonclipped, but normalized it in the clipped kidney (4.8 +/- 0.8 mL/min per gram kidney weight).(ABSTRACT TRUNCATED AT 250 WORDS)

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