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Am J Physiol Endocrinol Metab 256: E863-E871, 1989;
0193-1849/89 $5.00
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AJP - Endocrinology and Metabolism, Vol 256, Issue 6 E863-E871, Copyright © 1989 by American Physiological Society

ARTICLES

Adrenergic control of renin during dietary sodium deprivation in conscious dogs

H. Hisa, Y. H. Chen, K. J. Radke, J. L. Izzo Jr, C. D. Sladek and M. L. Blair
Department of Physiology, School of Medicine, University of Rochester, New York 14642.

These experiments evaluated the contribution of alpha- and beta-adrenergic stimulation to plasma renin activity (PRA) during early and long-term dietary sodium restriction, compared with normal sodium intake. Uninephrectomized conscious dogs with catheters in the aorta, vena cava, and remaining renal artery were studied during normal sodium diet (approximately 70 meq/day), after 2-3 days of low-sodium diet (5-7 meq/day), and after greater than or equal to 2 wk of low-sodium diet. Direct renal arterial (ira) infusion of phenoxybenzamine plus propranolol decreased PRA by similar proportions (39-48%) during all three states of dietary sodium intake. The PRA achieved after adrenergic blockade remained higher (P less than 0.05) during early and long-term sodium restriction than during normal sodium intake. The effect on PRA of ira infusion of propranolol alone was not different from that of phenoxybenzamine plus propranolol during normal or low-sodium diet, and the magnitude of decrease in PRA during low-sodium diet was the same whether propranolol (1 microgram.kg-1.min-1) was infused ira or intravenously. In summary, beta-adrenergic stimulation accounts for similar proportions of PRA during early and long-term dietary sodium restriction and during normal sodium intake. Renal alpha-adrenoceptors appear to play little or no role in control of PRA under these conditions.


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