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C/EBPβ-Thr217 Phosphorylation Stimulates Macrophage Inflammasome Activation and Liver Injury

Martina Buck1,2,3, Jose Solis-Herruzo4, Mario Chojkier1,2,3,5

  • 1Department of Medicine, University of California, San Diego, La Jolla, CA, USA.

Scientific Reports
|April 13, 2016
PubMed

Insights

Macrophage inflammasome activation in liver injury is mediated by CCAAT/Enhancer Binding Protein-β (C/EBPβ) phosphorylation. This specific C/EBPβ modification is crucial for inflammasome activation and subsequent liver cell death, contributing to liver damage.

Area of Science:

  • Hepatology
  • Immunology
  • Molecular Biology

Background:

  • Liver injury is amplified by macrophages, but the precise signaling pathways remain unclear.
  • CCAAT/Enhancer Binding Protein-β (C/EBPβ) is vital for macrophage differentiation and function.
  • Previous work indicated C/EBPβ phosphorylation mimics enhance macrophage survival against toxins.

Purpose of the Study:

  • To elucidate the role of C/EBPβ phosphorylation in macrophage inflammasome activation during liver injury.
  • To determine if C/EBPβ phosphorylation is essential for hepatotoxin-induced liver damage.

Main Methods:

  • Primary hepatocytes and liver macrophages were utilized.
  • Transgenic mice with altered C/EBPβ-Thr217 phosphorylation were employed.
  • Macrophage ablation and inhibitory peptides targeting C/EBPβ phosphorylation were used.

Main Results:

  • C/EBPβ phosphorylation at Thr217 is essential for inflammasome activation in liver macrophages.
  • This phosphorylation is critical for hepatocyte apoptosis induced by hepatotoxins.
  • Findings were corroborated in human liver samples from Toxic Oil Syndrome patients.

Conclusions:

  • C/EBPβ phosphorylation is a key mediator of macrophage-driven liver injury.
  • Targeting C/EBPβ phosphorylation may offer therapeutic strategies for liver diseases.
  • This signaling pathway is conserved in human acute liver injury.

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