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Investigating Mast Cell Secretory Granules; from Biosynthesis to Exocytosis
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Flagellin modulates TIM4 expression in mast cells.

Linjing Li1, Lihua Mo, Huijie Hao

  • 1Department of Gastroenterology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China.

Cell Biology International
|July 22, 2014
PubMed
Summary
This summary is machine-generated.

Flagellin (FGN) triggers mast cells to express T cell immunoglobulin mucin molecule 4 (TIM-4), a key factor in initiating T-helper 2 (Th2) immune responses. This finding clarifies a mechanism in Th2 polarization relevant to immune diseases.

Keywords:
T helper 2TIM4adjuvantflagellinmast cells

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Area of Science:

  • Immunology
  • Cell Biology
  • Microbiology

Background:

  • T-helper 2 (Th2) cell polarization is implicated in various immune diseases.
  • Microbial products often act as adjuvants in Th2 polarization models.
  • T cell immunoglobulin mucin molecule 4 (TIM-4) is crucial for initiating Th2 responses.

Purpose of the Study:

  • To investigate the role of flagellin (FGN) in inducing TIM-4 expression in mast cells.
  • To elucidate the mechanism by which FGN influences Th2 polarization via mast cells.

Main Methods:

  • Bone marrow-derived mast cells (BMMC) were generated and treated with FGN in vitro and in vivo.
  • TIM-4 expression and STAT6 phosphorylation were assessed using Western blotting.
  • A co-culture system of FGN-primed BMMC and naive CD4(+) T cells was used to evaluate Th2 differentiation.

Main Results:

  • FGN significantly increased TIM-4 levels in BMMC and intestinal mast cells.
  • Increased STAT6 phosphorylation was observed in FGN-exposed BMMC.
  • FGN-primed BMMC induced naive CD4(+) T cells to differentiate into Th2 cells in a TIM-4-dependent manner.

Conclusions:

  • Flagellin induces mast cells to express TIM-4.
  • This FGN-induced TIM-4 expression on mast cells facilitates Th2 cell polarization.
  • The FGN-mast cell-TIM-4 axis is a significant pathway for initiating Th2 responses.