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Hepatic expression of detoxification enzymes is decreased in human obstructive cholestasis due to gallstone biliary

Jin Chai1, Xinchan Feng1, Liangjun Zhang1

  • 1Department of Gastroenterology, Southwest Hospital, Third Military Medical University, Chongqing, P.R. China.

Plos One
|March 24, 2015
PubMed
Abstract

Insights

In human obstructive cholestasis, bile acid detoxification enzymes and the nuclear receptor FXR are significantly reduced, impairing the liver's ability to process bile acids.

Area of Science:

  • Hepatology
  • Bile Acid Metabolism
  • Molecular Biology

Background:

  • Bile acid metabolic enzymes and transporters change during cholestasis.
  • These changes are considered adaptive responses to reduce liver injury.
  • Molecular mechanisms in human obstructive cholestasis remain unclear.

Purpose of the Study:

  • Investigate molecular mechanisms of adaptive responses in human obstructive cholestasis.
  • Analyze expression of bile acid metabolism-related genes in gallstone-induced obstruction.

Main Methods:

  • Collected liver samples from cholestatic patients (gallstone obstruction) and controls.
  • Measured expression levels of bile acid synthetic/detoxification enzymes, membrane transporters, nuclear receptors, and transcription factors.

Main Results:

  • Increased bile acid synthetic enzymes (CYP7B1, CYP8B1) and CYP2B6.
  • Decreased detoxification enzymes (UGT2B4/7, SULT2A1, GSTs) by ~50%.
  • Altered membrane transporters (OSTβ, OCT1 increased; OSTα, ABCG2/8 decreased).
  • Induced nuclear receptors (VDR, HNF4α, RXRα, RARα) but reduced FXR.
  • Positive correlation between reduced FXR and decreased detoxification enzymes.

Conclusions:

  • Hepatic detoxification enzyme levels are significantly decreased in human obstructive cholestasis.
  • These decreases correlate with reduced Farnesoid X Receptor (FXR) levels.
  • Findings suggest impaired detoxification capacity in obstructive cholestasis.

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