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Related Experiment Videos

Epithelial cell volume regulation: bicarbonate dependence

R S Fisher, B E Persson, K R Spring

    Science (New York, N.Y.)
    |December 18, 1981
    PubMed
    Summary
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    Necturus gallbladder epithelial cells regulate volume by rapidly swelling in hypertonic solutions. This process relies on bicarbonate and chloride ion uptake, likely via specific membrane exchangers.

    Area of Science:

    • Cell biology
    • Physiology
    • Epithelial transport

    Background:

    • Osmotic stress triggers cell volume changes.
    • Epithelial cells possess mechanisms for volume regulation.
    • Ion transport is crucial for maintaining cell homeostasis.

    Purpose of the Study:

    • To investigate the mechanisms of volume regulation in Necturus gallbladder epithelial cells.
    • To identify the ions and transporters involved in cell volume recovery.

    Main Methods:

    • Osmotic shrinkage of Necturus gallbladder epithelial cells.
    • Exposure to hypertonic bathing solutions.
    • Measurement of ion fluxes and cell volume.

    Main Results:

    Related Experiment Videos

  • Cells rapidly recovered volume despite sustained hypertonic conditions.
  • Volume regulation required bicarbonate ions in the bathing solution.
  • Chloride ion uptake was associated with cell volume increase.

    • Conclusions:

    • Necturus gallbladder epithelial cells exhibit robust volume-regulatory increase.
    • The process involves apical membrane ion exchangers, specifically sodium-hydrogen and chloride-bicarbonate exchangers.
    • Bicarbonate and chloride ions are essential for this recovery mechanism.