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Coupled NaCl entry into Necturus gallbladder epithelial cells

A C Ericson, K R Spring

    The American Journal of Physiology
    |September 1, 1982
    PubMed
    Summary
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    Sodium chloride (NaCl) enters Necturus maculosus gallbladder cells via a bumetanide-sensitive, carrier-mediated process across the apical membrane. This mechanism drives fluid absorption, essential for gallbladder function.

    Area of Science:

    • Cell Biology
    • Physiology
    • Epithelial Transport

    Background:

    • Gallbladder epithelial cells absorb NaCl and water, a process crucial for fluid balance.
    • The Na+-K+-ATPase in the basolateral membrane actively transports sodium, maintaining the driving force for absorption.

    Purpose of the Study:

    • To elucidate the mechanism of NaCl entry across the apical membrane of Necturus maculosus gallbladder epithelial cells.
    • To quantify the rate and identify the transport pathway for NaCl influx.

    Main Methods:

    • Inhibition of Na+-K+-ATPase with ouabain to induce cell swelling.
    • Manipulation of mucosal bath ionic composition (Na+, Cl-) to assess entry mechanisms.
    • Kinetic analysis to determine saturation kinetics (K1/2) for Na+ and Cl-.

    Related Experiment Videos

  • Testing the effects of specific inhibitors (amiloride, bumetanide) and bicarbonate removal.

    • Main Results:

    • Ouabain inhibition led to cell swelling, indicating continued NaCl entry across the apical membrane.
    • NaCl entry was dependent on mucosal Na+ and Cl-, exhibiting saturable kinetics.
    • The transport mechanism was identified as carrier-mediated and sensitive to bumetanide, but not affected by Na+-H+ or Cl(-)-HCO-3 exchangers.

    Conclusions:

    • NaCl enters Necturus gallbladder epithelial cells via a coupled, carrier-mediated mechanism across the apical membrane.
    • This apical NaCl influx, coupled with basolateral Na+ extrusion, drives transepithelial NaCl and water absorption.
    • The findings highlight the specific transporters involved in gallbladder fluid absorption.