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Regulatory volume decrease in alveolar macrophages: cation loss is not correlated with changes in membrane recycling.

J M Novak1, P M Cala, D M Ward

  • 1Department of Pathology, University of Utah College of Medicine, Salt Lake City 84132.

Journal of Cellular Physiology
|November 1, 1988
PubMed
Summary
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Alveolar macrophages use regulatory volume decrease (RVD) to restore normal cell volume after swelling. This process involves the loss of potassium (K+) and chloride (Cl-) ions, initiated rapidly upon osmotic stress.

Area of Science:

  • Cell Biology
  • Physiology
  • Immunology

Background:

  • Alveolar macrophages, key immune cells in the lungs, can swell in hypotonic environments.
  • Regulatory Volume Decrease (RVD) is a cellular mechanism to counteract osmotic swelling and maintain cell homeostasis.

Purpose of the Study:

  • To investigate the ionic mechanisms and kinetics of regulatory volume decrease (RVD) in alveolar macrophages.
  • To determine the timing and cellular localization of ion transporters involved in RVD.

Main Methods:

  • Exposure of alveolar macrophages to hypotonic solutions.
  • Measurement of cell volume changes over time.
  • Analysis of intracellular cation content and ion efflux (rubidium assay).
  • Assessment of ion replacement effects (Na+, Cl-) and temperature dependence (0°C).

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Main Results:

  • Alveolar macrophages exhibit RVD, returning to near-normal volumes within 30 minutes after hypotonic exposure.
  • RVD is dependent on extracellular Na+ and Cl-, and occurs optimally above 0°C.
  • Cation loss (K+ and Cl-) is rapid, fits first-order kinetics, and precedes volume decrease and receptor changes.

Conclusions:

  • Alveolar macrophage RVD is primarily mediated by the efflux of K+ and Cl- ions.
  • The cation transporters responsible for RVD are located at the cell surface and their activity is regulated independently of membrane dynamics.