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Am J Physiol Regul Integr Comp Physiol 258: R1008-R1015, 1990;
0363-6119/90 $5.00
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AJP - Regulatory, Integrative and Comparative Physiology, Vol 258, Issue 4 1008-R1015, Copyright © 1990 by American Physiological Society

ARTICLES

Different effects of sodium or chloride depletion on angiotensin II receptors in rats

P. E. Ray, E. Castren, E. J. Ruley and J. M. Saavedra
Section on Pharmacology, National Institute of Mental Health, Bethesda, Maryland 20892.

We studied the effects of selective chronic sodium or chloride depletion (0.005% in diet) on central and peripheral angiotensin II receptors in young rats. Chloride depletion produced the most significant increase in plasma renin activity and extracellular fluid volume contraction. In the brain, subfornical organ angiotensin II receptor concentration was decreased by sodium depletion and increased by chloride depletion. There were no significant changes in angiotensin II binding in the paraventricular nucleus. When sodium-depleted rats were water deprived for 3 days, subfornical organ angiotensin II receptor concentration increased, showing that normal sodium intake was not essential for increased numbers of angiotensin II receptors during dehydration. In the adrenal gland, chloride depletion decreased angiotensin II receptors in the medulla and zona glomerulosa. Conversely, sodium depletion increased angiotensin II receptors in the zona glomerulosa. In the kidney glomeruli and medulla, angiotensin II receptors were decreased by either sodium or chloride depletion. These results suggest different roles for sodium and chloride in the regulation of the peripheral and central renin-angiotensin system in young rats.


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