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Induction of an Inflammatory Response in Primary Hepatocyte Cultures from Mice
08:32

Induction of an Inflammatory Response in Primary Hepatocyte Cultures from Mice

Published on: March 10, 2017

FXR ligands protect against hepatocellular inflammation via SOCS3 induction

Zhizhen Xu1, Gang Huang, Wei Gong

  • 1Department of Biochemistry and Molecular Biology, College of Basic Medical Sciences, Third Military Medical University, Chongqing 400038, China.

Cellular Signalling
|May 8, 2012
PubMed

Insights

Farnesoid X receptor (FXR) agonists reduce liver inflammation by increasing suppressor of cytokine signaling 3 (SOCS3) expression. This mechanism may offer new treatments for liver inflammatory diseases.

Area of Science:

  • Hepatology
  • Molecular Biology
  • Immunology

Background:

  • Farnesoid X receptor (FXR) agonists exhibit anti-inflammatory properties, making FXR a potential therapeutic target for liver diseases.
  • The precise molecular mechanisms underlying FXR's anti-inflammatory actions remain incompletely understood.

Purpose of the Study:

  • To elucidate the molecular mechanisms by which FXR activation exerts anti-inflammatory effects in liver injury.
  • To investigate the role of suppressor of cytokine signaling 3 (SOCS3) in mediating FXR's protective actions.

Main Methods:

  • Utilized an animal model of lipopolysaccharide (LPS)-induced liver injury.
  • Administered CDCA (a natural FXR ligand) and GW4064 (a synthetic FXR ligand).
  • Assessed inflammatory markers, transaminase activities, STAT3 phosphorylation, and SOCS3 expression; employed small interfering RNA (siRNA) for SOCS3 knockdown.

Main Results:

  • CDCA administration attenuated hepatocyte inflammatory damage and reduced liver injury markers in LPS-treated mice.
  • FXR activation suppressed key inflammation mediators (IL-6, TNF-α, ICAM-1) and inhibited STAT3 phosphorylation.
  • These protective effects correlated with increased SOCS3 expression, a negative regulator of cytokine-STAT3 signaling. SOCS3 knockdown diminished FXR's beneficial effects on STAT3 activation. Both natural and synthetic FXR ligands upregulated SOCS3 expression by enhancing its promoter activity.

Conclusions:

  • FXR activation protects against liver inflammation, at least partly, through the induction of SOCS3.
  • Modulation of SOCS3 expression represents a novel mechanism for FXR's anti-inflammatory effects.
  • FXR ligands hold therapeutic potential for treating liver inflammatory diseases by inducing SOCS3.

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