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Glucocorticoids increase the Na+-H+ exchange and decrease the Na+ gradient-dependent phosphate-uptake systems in

J M Freiberg, J Kinsella, B Sacktor

    Proceedings of the National Academy of Sciences of the United States of America
    |August 1, 1982
    PubMed
    Summary
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    Glucocorticoids like dexamethasone enhance sodium-hydrogen exchange in rat kidneys, affecting phosphate transport but not glucose uptake. This clarifies how these hormones influence acid secretion and phosphate excretion.

    Area of Science:

    • Nephrology
    • Endocrinology
    • Molecular Physiology

    Background:

    • Glucocorticoids are key regulators of renal function.
    • Understanding their precise molecular targets in the kidney is crucial for explaining physiological effects like acid-base balance and phosphate homeostasis.

    Purpose of the Study:

    • To investigate the effect of the glucocorticoid dexamethasone on ion transport in rat proximal tubule brush border vesicles.
    • To determine whether dexamethasone specifically modulates amiloride-sensitive Na+-H+ exchange and its impact on phosphate and glucose transport.

    Main Methods:

    • Preparation of rat proximal tubule brush border membrane vesicles.
    • Measurement of Na+ uptake, including amiloride-sensitive and Na+ gradient-dependent transport.
    • Assay of phosphate and D-glucose uptake in the presence and absence of a Na+ gradient.

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    Main Results:

    • Dexamethasone significantly increased amiloride-sensitive Na+-H+ exchange activity.
    • Glucocorticoid treatment decreased Na+ gradient-dependent phosphate uptake.
    • Na+ uptake independent of amiloride and Na+ gradient-dependent D-glucose uptake remained unaffected.

    Conclusions:

    • Dexamethasone selectively enhances Na+-H+ exchange in rat proximal tubules, contributing to its known effects on acid secretion.
    • The observed decrease in phosphate uptake suggests a mechanism for glucocorticoid-induced phosphaturia.
    • These findings pinpoint the proximal tubule brush border as a key site for glucocorticoid action on ion and nutrient transport.