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The effects of intrarenal infusion of 1-sar-8-ala angiotension II (P 113) and a converting enzyme inhibitor, SQ 20881, at doses that did not affect systemic blood pressure (2.0 mug/kg per min) were studied in conscious, uninephrectomized dogs. In dogs receiving approximately equal to 5 mEq/day of sodium, intrarenal infusion of P 113 increased renal blood flow (RBF) from 219.8 +/- 32.3 to 282.7 +/- 20.0 ml/min (P less than 0.004), and with intrarenal SQ 20881 infusion from 215.3 +/- 14.2 to 278.0 +/- 22.2 ml/min (p less than 0.005). In sodium-restricted dogs (approximately equal to 5 mEq/day), glomerular filtration rate (GFR) also increased with intrarenal P 113 infusion from 57.9 +/- 5.7 to 66.3 +/- 6.6 ml/min (P less than 0.05), and with SQ 20881 infusion from 43.1 +/- 2.1 to 55.7 +/- 4.5 ml/min (P less than 0.01). Dogs on approximately equal to 5 mEq/day of sodium showed significant increases in plasma renin activity (PRA) with intrarenal infusion of the peptides, unmasking a negative feedback inhibition of renin release by angiotensin II. No increases in RBF, GFR, or PRA were seen with infusion without inhibitors, or in dogs give P 113 or SQ 20881 while on approximately equal to 80 mEq/day of sodium. In addition, angiotensin II inhibition increased sodium excretion during sodium restriction. These findings suggest that intrarenal angiotensin II is intimately involved in renal responses to sodium restriction which result in conservation of sodium and water.

Effect of intrarenal angiotensin II blockade on renal function in conscious dogs.