The FASEB Journal, Vol 8, 436-439, Copyright © 1994 by The Federation of American Societies for Experimental Biology

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Activation/deactivation of renal Na+,K(+)-ATPase: a final common pathway for regulation of natriuresis

A Aperia, U Holtback, ML Syren, LB Svensson, J Fryckstedt and P Greengard
Department of Woman and Child Health, St. Goran's Children's Hospital, Karolinska Institutet, Stockholm, Sweden.

Renal sodium metabolism, a major determinant of blood pressure, is regulated with great precision by a variety of endocrine, autocrine, and neuronal factors. Although these factors are known to regulate sodium metabolism by affecting the rate of tubular sodium reabsorption, the molecular mechanisms by which they act are poorly understood. Na+,K(+)-ATPase plays a pivotal role for sodium reabsorption in all tubular segments. The activity of this enzyme can be dynamically regulated by phosphorylation and dephosphorylation. Here we summarize both old and new evidence that several major substances believed to be involved in the regulation of sodium metabolism and blood pressure, i.e., the antidiuretic agents angiotensin II and norepinephrine, and the diuretic agents dopamine and atrial natriuretic peptide (ANP), may achieve their effects through a common pathway that involves reversible activation/deactivation of renal tubular Na+,K(+)-ATPase. Regulation of Na+,K(+)-ATPase activity was studied using a preparation of single proximal tubule (PT) segments, dissected from rat kidneys. Na+,K(+)- ATPase activity was stimulated by angiotensin II and the alpha- adrenergic agonist, oxymetazoline, at physiological, nonsaturating Na+ concentrations. These stimulatory effects were blocked by dopamine and ANP as well as by their respective second messengers, cAMP and cGMP. They were also blocked by the specific protein phosphatase 2B inhibitor FK506. These results indicate that regulation of sodium excretion by norepinephrine, angiotensin II, dopamine, and ANP can be accounted for by a bidirectionally regulated intracellular protein phosphorylation cascade that modulates the activity of renal tubular Na+,K(+)-ATPase.

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