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Characterization of regulatory volume decrease in freshly isolated mouse cholangiocytes.

Won Kyoo Cho1

  • 1Department of Medicine, Division of Gastroenterology/Hepatology, Indiana University School of Medicine and The Richard L. Roudebush Veterans Affairs Medical Center, Indianapolis, Indiana 46202-5121, USA. wkcho@iupui.edu

American Journal of Physiology. Gastrointestinal and Liver Physiology
|November 16, 2002
PubMed
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Normal mouse cholangiocytes exhibit regulatory volume decrease (RVD), a process crucial for cell function. This study identifies specific chloride and potassium channels involved in RVD in bile duct cell clusters (BDCCs).

Area of Science:

  • Cell biology
  • Physiology
  • Molecular biology

Background:

  • Cell volume regulation is essential for cellular functions.
  • Previous studies implicated K(+) and Cl(-) channels in cholangiocarcinoma cell RVD, but physiological relevance remained unclear.
  • Normal cholangiocyte RVD mechanisms require further investigation.

Purpose of the Study:

  • To investigate the regulatory volume decrease (RVD) in normal mouse cholangiocytes.
  • To identify the ion channels involved in cholangiocyte RVD.
  • To establish a practical method for studying cholangiocyte volume regulation.

Main Methods:

  • Freshly isolated bile duct cell clusters (BDCCs) from normal mice were used.
  • Quantitative videomicroscopy measured BDCC cross-sectional area to indirectly assess cell volume.

Related Experiment Videos

  • Pharmacological agents were used to inhibit specific ion channels and assess their role in RVD.

    • Main Results:

    • Mouse cholangiocytes demonstrated regulatory volume decrease (RVD).
    • RVD was inhibited by chloride channel blockers (5-nitro-2'-(3-phenylpropylamino)-benzoate, DIDS) and glibenclamide, indicating involvement of volume-activated chloride channels.
    • RVD was inhibited by barium chloride but not tetraethylammonium chloride, suggesting involvement of specific potassium channels.
    • Cyclic adenosine monophosphate (cAMP) agonists did not significantly affect RVD in BDCCs.

    Conclusions:

    • Normal mouse cholangiocytes undergo regulatory volume decrease (RVD).
    • RVD in these cells is dependent on specific chloride and potassium channels.
    • The described videomicroscopy method provides a practical approach for studying cholangiocyte RVD in various mouse models.