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Am J Physiol Cell Physiol 249: C267-C270, 1985;
0363-6143/85 $5.00
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AJP - Cell Physiology, Vol 249, Issue 3 267-C270, Copyright © 1985 by American Physiological Society

ARTICLES

Vasopressin stimulates DNA synthesis and ion transport in quiescent epithelial cells

V. M. Reznik, R. J. Shapiro and S. A. Mendoza

The mitogenic effect of vasopressin was studied in subconfluent quiescent renal epithelial cells (MDCK). Vasopressin stimulated DNA synthesis in the presence of low concentrations of serum. Vasopressin increased the entry of Na into the cells and increased ouabain-sensitive 86Rb uptake, a measure of Na-K pump activity. Because the activity of the Na-K pump in MDCK cells is steeply dependent on intracellular Na, it is likely that stimulation of the Na-K pump by vasopressin was mediated by the increase in Na entry into the cells. Thus both serum and vasopressin stimulate Na uptake and Na-K pump activity in quiescent MDCK cells with a subsequent increase in DNA synthesis. It is concluded that growth regulation in epithelial cells may be mediated in part by changes in monovalent ion transport.


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