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1 Laboratory of Kidney and Electrolyte Metabolism, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland 20892-1603; and 2 The Water and Salt Research Center, University of Aarhus, DK-8000 Aarhus C, Denmark
Renal tubule profiling studies were
carried out to investigate the long-term effects of administration of
spironolactone, a mineralocorticoid receptor antagonist, on abundances
of the major Na transporter and Na channel proteins along the rat renal tubule. Oral administration of spironolactone for 7 days to
NaCl-restricted rats did not significantly alter abundances of Na
transporters expressed proximal to the macula densa, while
substantially decreasing the abundances of the thiazide-sensitive Na-Cl
cotransporter (NCC), the
-subunit of the amiloride-sensitive
epithelial Na channel (ENaC), and the 70-kDa form of the
-subunit of
ENaC. A dependency of NCC expression on aldosterone was confirmed by
showing increased NCC expression in response to aldosterone infusion in
adrenalectomized rats. Immunoperoxidase labeling of ENaC in renal
cortex confirmed that dietary NaCl restriction causes a redistribution
of ENaC to the apical domain of connecting tubule cells and showed that high-dose spironolactone administration does not block this apical redistribution. In contrast, spironolactone completely blocked the
increase in
-ENaC abundance in response to dietary NaCl restriction. We conclude that the protein abundances of NCC,
-ENaC, and the 70-kDa form of
-ENaC are regulated via the classical
mineralocorticoid receptor, but the subcellular redistribution of ENaC
in response to dietary NaCl restriction is not prevented by blockade of
the mineralocorticoid receptor.
aldosterone; collecting duct; distal convoluted tubule
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