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Regulatory volume decrease in cultured kidney cells (A6): role of amino acids

P De Smet1, J Simaels, P E Declercq

  • 1Laboratorium voor Fysiologie, K. U. Leuven, Belgium.

The Journal of General Physiology
|September 1, 1995
PubMed
Summary
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A6 epithelia exhibit regulatory volume decrease (RVD) when exposed to hypotonic solutions. Amino acid excretion contributes to RVD, and external amino acids may stimulate this volume regulation process.

Area of Science:

  • Cell Biology
  • Physiology
  • Biochemistry

Background:

  • Cell volume regulation is crucial for maintaining cellular function.
  • Epithelial cells, like A6 cells, possess mechanisms to adapt to osmotic stress.
  • The role of amino acids in epithelial volume regulation requires further elucidation.

Purpose of the Study:

  • To investigate volume regulation in A6 epithelia under hypotonic conditions.
  • To determine the involvement of amino acids in the regulatory volume decrease (RVD) response.
  • To explore the effect of exogenous amino acids on RVD in A6 cells.

Main Methods:

  • A6 epithelia grown on permeable supports were used.
  • Cell thickness (Tc), short circuit current (ISC), and transepithelial conductance (Gt) were measured.

Related Experiment Videos

  • Amino acid analysis of cell extracts and bathing solutions was performed.

    • Main Results:

    • Hypotonic stress induced regulatory volume decrease (RVD) in A6 epithelia.
    • Excretion of glycine, aspartate, and glutamate increased during hypotonic treatment.
    • Exogenous amino acids, particularly glycine, aspartate, and glutamate, enhanced RVD amplitude.

    Conclusions:

    • A6 epithelia demonstrate robust volume regulatory mechanisms, including RVD.
    • Amino acid excretion is a component of RVD, though not fully accounting for volume changes.
    • Extracellular amino acids appear to stimulate the RVD process in A6 cells.