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Osmolality-induced changes in aldosterone secretion involve a chloride-dependent process

N Hayama1, W Wang, E G Schneider

  • 1Department of Physiology and Biophysics, University of Tennessee, Memphis 38163.

The American Journal of Physiology
|January 1, 1995
PubMed
Summary

Changes in extracellular fluid osmolality affect aldosterone secretion by altering cell volume. Chloride influx contributes to cell swelling and is crucial for osmolality-induced aldosterone release, impacting cell volume regulation.

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Area of Science:

  • Endocrinology
  • Cell Physiology
  • Molecular Biology

Background:

  • Extracellular osmolality powerfully influences aldosterone secretion, linked to cell volume changes.
  • Bovine glomerulosa cells are a model for studying osmolality's effects on aldosterone production.

Purpose of the Study:

  • To investigate how changes in extracellular osmolality affect bovine glomerulosa cell volume and aldosterone secretion.
  • To determine the role of chloride ions in osmolality-induced cell volume and aldosterone release.

Main Methods:

  • Primary culture of dispersed bovine glomerulosa cells.
  • Measurement of cell volume using [14C]urea and [3H]mannitol distribution.
  • Assay of aldosterone secretion under varying osmolality and chloride concentrations.

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Main Results:

  • Decreased osmolality increased cell volume in the presence of chloride.
  • Removing chloride suppressed osmolality-induced cell swelling, cytosolic calcium increases, and aldosterone secretion.
  • Chloride replacement with methyl sulfate inhibited angiotensin II-stimulated aldosterone secretion at low, but not high, concentrations.

Conclusions:

  • Reductions in osmolality increase cell volume partly via chloride influx, contributing to water entry.
  • Altered cell volume and membrane stretch may modulate angiotensin II signaling pathways, affecting aldosterone secretion.