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Drug-Induced Senescence in Liver Cells Promotes M2 Macrophage Polarization: Implications for Tyrosine Kinase Inhibitor-Associated Hepatotoxicity
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Drug-Induced Senescence in Liver Cells Promotes M2 Macrophage Polarization: Implications for Tyrosine Kinase Inhibitor-Associated Hepatotoxicity

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Senescent hepatocyte secretion of matrix metalloproteinases is regulated by nuclear factor-κB signaling

Jinfeng Zang1, Min Sha2, Chi Zhang1

  • 1Department of Hepatobiliary Surgery, Taizhou People's Hospital, The Fifth Affiliated Hospital of Medical School of Nantong University, China.

Life Sciences
|October 22, 2017
PubMed
Abstract

Insights

Senescent hepatocytes secrete matrix metalloproteinases (MMPs), enzymes linked to liver disease progression. Nuclear factor-kappa B (NF-κB) signaling drives this MMP production in liver cells.

Area of Science:

  • Hepatology
  • Cellular Biology
  • Molecular Biology

Background:

  • Cellular senescence and matrix metalloproteinases (MMPs) are implicated in liver disease pathogenesis.
  • The specific contribution of senescent hepatocytes to MMP production and the regulatory mechanisms involved remain unclear.

Purpose of the Study:

  • To investigate whether senescent hepatocytes secrete MMPs.
  • To determine if nuclear factor-kappa B (NF-κB) signaling regulates MMP production in senescent hepatocytes.

Main Methods:

  • Hepatocyte senescence was induced in AML12 cells using hydrogen peroxide (H2O2).
  • NF-κB signaling activity was assessed via Western blotting and luciferase reporter assays.
  • Expression levels of MMP-2, MMP-9, and MMP-13 were quantified using RT-qPCR.

Main Results:

  • H2O2-induced senescent AML12 cells exhibited characteristic senescence morphology.
  • Senescent AML12 cells displayed elevated NF-κB activity and increased expression of MMP-2, MMP-9, and MMP-13.
  • Inhibition of NF-κB signaling with BAY 11-7082 reduced MMP levels.

Conclusions:

  • Senescent hepatocytes contribute to liver disease pathology by secreting MMPs.
  • NF-κB signaling is a key regulator of MMP production in senescent hepatocytes, influencing extracellular matrix remodeling.
Keywords:
HepatocyteMatrix metalloproteinaseNuclear factor-κBSenescence

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