Am J Physiol Cell Physiol AJP: Endocrinology and Metabolism
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Am J Physiol Cell Physiol 275: C303-C308, 1998;
0363-6143/98 $5.00
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Vol. 275, Issue 1, C303-C308, July 1998

Effect of in vivo corticosteroids on Na+ transport across airway epithelia

B. R. Grubb and R. C. Boucher

Cystic Fibrosis/Pulmonary Research and Treatment Center, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7248

We have investigated the role in vivo of mineralocorticoid and glucocorticoid hormones in regulating the rate of electrogenic amiloride-sensitive Na+ absorption across murine airway tissue studied in vivo (nasal potential difference) and in vitro (Ussing chambers). We found that elevating the plasma aldosterone concentration 10-fold (low-Na+ diet) had no significant effect on amiloride-sensitive Na+ absorption across tracheal or nasal epithelia. High doses of dexamethasone for 1 wk likewise did not change the rate of amiloride-sensitive Na+ absorption across airway epithelia. In contrast, both hormonal manipulations elevated the rate of colonic Na+ absorption. Furthermore, adrenalectomy (both normal and cystic fibrosis mice) also failed to alter Na+ absorption across airway epithelia. We conclude that, in vivo, neither the mineralocorticoid nor the glucocorticoid hormones significantly regulate the rates of amiloride-sensitive electrogenic Na+ absorption across airway epithelia in the adult mouse.

aldosterone; dexamethasone; adrenalectomy; mouse; cystic fibrosis


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