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Related Experiment Videos

Regulatory volume decrease stimulates bile flow, bile acid excretion, and exocytosis in isolated perfused rat liver.

R Bruck1, P Haddad, J Graf

  • 1Liver Center, Yale University School of Medicine, New Haven, Connecticut 06510.

The American Journal of Physiology
|May 1, 1992
PubMed
Summary
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Volume regulation in liver cells stimulates bile flow and bile acid excretion. This process involves potassium channels and microtubule-dependent exocytosis, impacting liver function during hypotonic stress.

Area of Science:

  • Hepatology
  • Cell Physiology
  • Membrane Transport

Background:

  • Bile secretion is crucial for liver function and detoxification.
  • Cell volume regulation mechanisms are essential for maintaining cellular homeostasis.
  • Understanding how volume changes affect bile secretion is key to liver health.

Purpose of the Study:

  • To investigate the impact of volume regulation on bile secretory function in isolated perfused rat livers.
  • To elucidate the mechanisms underlying altered bile flow and biliary excretion during hypotonic stress.

Main Methods:

  • Isolated perfused rat livers (IPRL) subjected to hypotonic stress (45 mM NaCl).
  • Measurement of bile flow, bile acid excretion, and horseradish peroxidase (HRP) excretion.
  • Assessment of the effects of colchicine, lumicolchicine, and BaCl2 on these parameters.

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Main Results:

  • Hypotonic stress induced a biphasic increase in bile flow and enhanced HRP excretion.
  • Regulatory Volume Decrease (RVD) inhibition by BaCl2 or colchicine abolished the second phase of increased bile flow and HRP excretion.
  • Sodium taurocholate infusion amplified the RVD-induced increase in bile flow and bile acid excretion.

Conclusions:

  • Hepatocyte volume regulation significantly stimulates bile flow and bile acid excretion.
  • These effects are mediated by K+ channels and microtubule-dependent exocytosis at the canalicular membrane.
  • RVD plays a critical role in modulating bile secretory function.