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Apoptosis signal-regulating kinase 1 regulates colitis and colitis-associated tumorigenesis by the innate immune

Yoku Hayakawa1, Yoshihiro Hirata, Hayato Nakagawa

  • 1Department of Gastroenterology, University of Tokyo, Tokyo 113-8655, Japan.

Gastroenterology
|November 26, 2009
PubMed
Abstract

Insights

Apoptosis signal-regulating kinase 1 (ASK1) is crucial for controlling intestinal inflammation and colitis-associated cancer (CAC) by regulating innate immunity and macrophage function.

Area of Science:

  • Immunology
  • Molecular Biology
  • Gastroenterology

Background:

  • Mitogen-activated protein kinase (MAPK) pathways are vital for cellular functions and linked to inflammatory bowel disease and colitis-associated cancer (CAC).
  • Apoptosis signal-regulating kinase 1 (ASK1), a MAPK kinase kinase, has an under-explored role in colonic diseases.

Purpose of the Study:

  • To investigate the role of ASK1 in the development of intestinal inflammation and CAC.
  • To assess the impact of ASK1 deficiency on innate immune responses in the colon.

Main Methods:

  • Induction of colitis using dextran sodium sulfate (DSS) or Citrobacter rodentium in wild-type (WT) and ASK1 knock-out (ASK1(-/-)) mice.
  • Induction of CAC using azoxymethane and DSS in WT and ASK1(-/-) mice.
  • In vitro analysis of primary macrophages and bone marrow chimeric mice to study ASK1's role in innate immunity and colitis.

Main Results:

  • ASK1 deficiency exacerbated colonic inflammation and increased susceptibility to colitis.
  • ASK1(-/-) macrophages showed impaired bacterial killing and increased apoptosis due to p38 inactivation and reduced antiapoptotic gene expression.
  • ASK1(-/-) bone marrow cell transplants led to more severe DSS-induced colitis.
  • ASK1(-/-) mice exhibited increased tumor multiplicity and size in the CAC model, driven by heightened colonic inflammation.

Conclusions:

  • ASK1 plays a critical role in regulating intestinal inflammation and CAC development.
  • ASK1 controls innate immune responses, particularly macrophage function, which influences colonic disease progression.

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