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Circulation Research. 1975;37:464-470

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Circulation Research, Vol 37, 464-470, Copyright © 1975 by American Heart Association

ARTICLES

Control of renin secretion in the dog. Effects of furosemide on the vascular and macula densa receptors

WA Corsini, JB Hook and MD Bailie

Experiments were undertaken to investigate further the effect of furosemide on renin secretion in the anesthetized dog. To separate the effects of the macula densa and the baroreceptor mechanisms, experiments were conducted in kidneys made nonfiltering by combining 2.5 hours of renal ischemia with ureteral ligation. Furosemide, in a dose of 5 mg/kg, increased renin secretion and decreased renal resistance in dogs with a nonfiltering kidney. Prior dilation of the nonfiltering kidney with either acetylcholine or papaverine prevented changes in both resistance and renin secretion. However, following dilation of the intact filtering kidney with acetylcholine, furosemide caused an increase in renin secretion. Infusion of d,l-propranolol decreased renin secretion in both the filtering and the nonfiltering kidneys. Following propranolol treatment, furosemide increased renin secretion in the filtering kidney but had no effect on renal resistance. These experiments indicate that furosemide stimulates renin secretion by both the macula densa and the baroreceptor mechanisms. The data suggest that stimulation of the sympathetic nervous system may alter renin secretion by modulating the renal baroreceptor, but sympathetic innervation does not appear to be involved in the macula densa mechanism.


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