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To study the influence of endothelium derived relaxing factor/nitric oxide (EDNO) on renin gene expression, the effects of a 2-day treatment with the NO-synthase inhibitor nitro-L-arginine-methylester (L-NAME, 40 mg/kg twice a day) on plasma renin activity (PRA) and renal and adrenal renin m-RNA levels were examined in conscious rats with and without unilateral renal clips (0.2 mm). In sham-clipped animals L-NAME led to a decrease of PRA from 7.5 to 2.5 ng angiotensin (ANGI).h-1.ml-1 and to a 35% decrease of renal renin m-RNA levels. Unilateral renal artery clipping increased PRA to 35 and to 13 ng ANGI.h-1.ml-1 in vehicle and in L-NAME-treated rats, respectively. In the clipped kidneys renin m-RNA levels increased to 450% of control values in vehicle-treated animals and to 220% of control values in L-NAME-treated animals. In the contralaterals as opposed to clipped kidneys, renin m-RNA levels decreased to 16% and 50% of the control values in vehicle- and in L-NAME-treated animals, respectively. In the adrenal glands renin m-RNA levels were not significantly changed either by clipping of one renal artery or by treatment of animals with L-NAME. The NO-donor sodium nitroprusside (100 microM) was found to increase renin secretion and renin m-RNA levels in primary cultures of renal juxtaglomerular cells. These findings suggest that EDNO is involved in the control of the renin gene by the renal perfusion pressure.

Endothelium derived relaxing factor is involved in the pressure control of renin gene expression in the kidney