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Induction of Murine Intestinal Inflammation by Adoptive Transfer of Effector CD4+CD45RBhigh T Cells into Immunodeficient Mice
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The Wnt5a-Ror2 axis promotes the signaling circuit between interleukin-12 and interferon-γ in colitis

Akira Sato1, Hisako Kayama2, Kensaku Shojima1

  • 1Departments of Molecular Biology and Biochemistry.

Scientific Reports
|June 2, 2015
PubMed

Insights

The Wnt5a signaling pathway is crucial for intestinal immunity and the development of inflammatory bowel disease. Targeting Wnt5a may offer a new therapeutic strategy for colitis by modulating T-cell responses.

Area of Science:

  • Immunology
  • Molecular Biology
  • Gastroenterology

Background:

  • Wnt5a signaling regulates cellular functions and is implicated in inflammatory responses, but its precise role in intestinal immunity remains unclear.
  • Understanding the mechanisms of Wnt5a in inflammation is critical for developing targeted therapies.

Purpose of the Study:

  • To investigate the role of Wnt5a signaling in intestinal immunity and dextran sodium sulfate (DSS)-induced colitis.
  • To elucidate the molecular mechanisms by which Wnt5a influences T-cell differentiation in the context of colitis.

Main Methods:

  • Utilized conditional knockout mice lacking Wnt5a or its receptor Ror2.
  • Induced colitis using DSS and assessed inflammatory responses, cytokine production, and T-cell populations.
  • Investigated dendritic cell (DC) function in T-cell differentiation in vitro.

Main Results:

  • Deletion of Wnt5a or Ror2 suppressed DSS-induced colitis, reducing inflammation and interferon-γ (IFN-γ)-producing CD4(+) Th1 cells.
  • Wnt5a was upregulated in ulcerative lesions of mice and human inflammatory bowel disease (IBD) patients.
  • Wnt5a-Ror2 signaling enhanced DC priming of T cells, promoting IFN-γ-induced interleukin-12 (IL-12) expression and Th1 differentiation.

Conclusions:

  • Wnt5a signaling promotes Th1 cell differentiation in colitis by enhancing IL-12 production in DCs.
  • The Wnt5a-Ror2 axis plays a significant role in regulating intestinal inflammation.
  • Targeting Wnt5a signaling represents a potential therapeutic avenue for inflammatory bowel disease.

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