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Negative regulation of liver regeneration by innate immunity (natural killer cells/interferon-gamma)

Rui Sun1, Bin Gao

  • 1NIAAA, NIH, Bethesda, MD 20892, USA.

Gastroenterology
|November 3, 2004
PubMed
Abstract

Insights

Activation of innate immunity, specifically natural killer (NK) cells and interferon-gamma (IFN-γ), suppresses liver regeneration following partial hepatectomy. This NK/IFN-γ pathway is implicated in viral hepatitis pathogenesis.

Area of Science:

  • Immunology
  • Hepatology
  • Regenerative Medicine

Background:

  • Hepatic lymphocytes, primarily natural killer (NK) cells and NKT cells, are crucial for innate immunity in the liver.
  • Activation of innate immunity through viral infection or toll-like receptor 3 (TLR3) ligand influences liver regeneration.

Purpose of the Study:

  • To investigate the impact of innate immunity activation on liver regeneration.
  • To elucidate the roles of NK cells, NKT cells, and interferon-gamma (IFN-γ) in this process.

Main Methods:

  • Partial hepatectomy (PHx) model for studying liver regeneration.
  • Murine cytomegalovirus (MCMV) infection and polyinosinic-polycytidylic acid [poly(I:C)] to activate innate immunity.
  • NK cell depletion and gene disruption (IFN-γ, IFN-γ receptor) to assess their roles.

Main Results:

  • NK cells are activated post-PHx, producing IFN-γ, which attenuates liver regeneration.
  • MCMV infection and poly(I:C) further activate NK cells and inhibit liver regeneration.
  • Depletion of NK cells or IFN-γ signaling enhances liver regeneration and counteracts inhibitory effects.

Conclusions:

  • Innate immunity activation, particularly via NK cells and IFN-γ, negatively regulates liver regeneration.
  • This pathway is a potential contributor to the pathology of viral hepatitis.

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