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Hypertension, Vol 19, 221-227, Copyright © 1992 by American Heart Association

ARTICLES

Aldosterone regulation of gene transcription leading to control of ion transport

JD Horisberger and BC Rossier
Institut de Pharmacologie, Universite de Lausanne, Switzerland.

Aldosterone, like other steroid hormones, initiates its effects by binding to intracellular receptors; these receptors are then able to control the transcription of several genes. The products of these genes eventually modulate the activity of ionic transport systems located in the apical and the basolateral membrane of specialized epithelial cells, thereby modulating the excretion of Na+ and K+ ions. Considerable progress has been made recently in understanding these mechanisms and the structure of the proteins involved in these processes. A novel principle has been discovered to explain the selective effect of aldosterone on its target epithelia. These tissues exclude competing glucocorticoid hormones by the activity of the 11 beta-hydroxysteroid dehydrogenase to allow aldosterone, an enzyme- resistant steroid, to bind to its receptors. Aldosterone induces numerous changes in the activity of membrane ion transport systems and enzymes and cell morphology. Although the enhancement of Na,K-ATPase synthesis and the increase of the number of active Na+ channels in the apical membrane appear as both direct and primary effects, the mechanisms of the other effects remain to be determined. The knowledge of the primary structure of several elements of the aldosterone response system (e.g., mineralocorticoid receptor and Na,K-ATPase) allows us to understand abnormal regulation of Na+ balance at the molecular level and, potentially, to identify genetic alterations responsible for these defects.

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