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Toll-like receptor 4 participates in gastric mucosal protection through Cox-2 and PGE2

Yan Zhang1, Huan Chen, Li Yang

  • 1Division of Gastroenterology, West China Hospital of Sichuan University, GuoXue Street 37, Chengdu 610041, Sichuan, China. fengyixx@sohu.com

Digestive and Liver Disease : Official Journal of the Italian Society of Gastroenterology and the Italian Association for the Study of the Liver
|December 19, 2009
PubMed
Abstract

Insights

Toll-like receptor 4 (TLR4) signaling activates in the stomach after ethanol injury. This pathway protects the gastric lining by increasing cyclooxygenase-2 (Cox-2) and prostaglandin E2 (PGE2) production.

Area of Science:

  • Gastroenterology
  • Immunology
  • Cell Biology

Background:

  • Ethanol-induced gastric injury is a significant clinical concern.
  • Toll-like receptors (TLRs) play crucial roles in innate immunity and inflammation.
  • The specific role of TLRs in gastric cytoprotection remains incompletely understood.

Purpose of the Study:

  • To investigate the involvement of Toll-like receptors (TLRs) in protecting the gastric mucosa from ethanol-induced damage.
  • To elucidate the molecular mechanisms underlying TLR-mediated gastric cytoprotection.

Main Methods:

  • Utilized C57BL/6J, C3H/HeOuJ, and C3H/HeJ mouse models of ethanol-induced gastric injury.
  • Assessed the expression of TLR4, cyclooxygenase-2 (Cox-2), and prostaglandin E2 (PGE2) using immunohistochemistry, Western blotting, and ELISA.
  • Quantified macrophage infiltration and MIP-2 expression.

Main Results:

  • TLR4 expression was upregulated in the gastric mucosa of C57BL/6J mice 4 hours post-ethanol administration.
  • Gastric injury was more severe in C3H/HeJ mice compared to C3H/HeOuJ mice.
  • Upregulation of Cox-2 and PGE2, along with increased macrophage infiltration and MIP-2 expression, was observed exclusively in C3H/HeOuJ mice.

Conclusions:

  • TLR4 signaling is activated in the mouse stomach following ethanol injury.
  • The cytoprotective effects of TLR4 are mediated by the induction of Cox-2 expression and subsequent PGE2 production.
  • These findings highlight TLR4 as a potential therapeutic target for managing alcohol-induced gastric damage.

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