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PTEN regulates TLR5-induced intestinal inflammation by controlling Mal/TIRAP recruitment

Yoon Jeong Choi1, Jane Jung, Hyo Kyun Chung

  • 1Division of Digestive Diseases, David Geffen School of Medicine, University of California–Los Angeles, Los Angeles, California 90095, USA.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|October 6, 2012
PubMed

Insights

Interleukin-10 (IL-10) deficiency exacerbates flagellin-induced colitis. PTEN deletion inhibits this inflammation by disrupting Mal recruitment to TLR5, suggesting a novel therapeutic target for intestinal inflammation.

Area of Science:

  • Immunology
  • Gastroenterology
  • Molecular Biology

Background:

  • Defective Interleukin-10 (IL-10) alleles are linked to intestinal inflammation.
  • Toll-like receptor 5 (TLR5) recognizes flagellin, a microbial component crucial for intestinal epithelial cell responses.
  • Microbial factors contribute to intestinal inflammation, particularly in IL-10 deficient states.

Purpose of the Study:

  • To investigate the role of PTEN in regulating flagellin-induced colonic inflammation in IL-10 deficient mice.
  • To elucidate the molecular mechanism by which PTEN influences TLR5 signaling and inflammatory responses.

Main Methods:

  • Induction of colonic inflammation using flagellin in IL-10(-/-) and TLR5(-/-);IL-10(-/-) mouse models.
  • Assessment of inflammatory markers including tissue hypertrophy, epithelial changes, and cytokine production (MPO, KC, IL-6).
  • Analysis of PTEN deletion effects on flagellin-induced inflammation and TLR5 signaling, focusing on the adaptor protein Mal.

Main Results:

  • Flagellin induced significant colonic inflammation in IL-10(-/-) mice, characterized by hypertrophy, inflamed epithelium, and elevated cytokines.
  • Inflammatory responses were significantly reduced in TLR5(-/-);IL-10(-/-) mice, confirming TLR5's role.
  • Intestinal epithelial PTEN deletion attenuated flagellin-induced inflammation.
  • PTEN deletion disrupted the interaction between Mal and TLR5, impeding Mal localization and TLR5 signaling.

Conclusions:

  • PTEN plays a critical role in regulating TLR5-mediated inflammatory responses in the colon.
  • PTEN controls flagellin-induced inflammation by modulating Mal recruitment to TLR5.
  • Targeting the PTEN-Mal-TLR5 axis may offer a therapeutic strategy for intestinal inflammatory diseases.

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