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Protection against colitis by CD100-dependent modulation of intraepithelial γδ T lymphocyte function.

T F Meehan1, D A Witherden1, C-H Kim1

  • 1Department of Immunology and Microbial Science, The Scripps Research Institute, La Jolla, California, USA.

Mucosal Immunology
|May 23, 2013
PubMed
Summary
This summary is machine-generated.

The semaphorin CD100 molecule is crucial for intraepithelial gamma delta T cells (γδ IEL) to produce keratinocyte growth factor-1 (KGF-1), promoting colon epithelial repair during colitis. CD100 deficiency impairs this healing response.

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07:34

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Area of Science:

  • Immunology
  • Gastroenterology
  • Cell Biology

Background:

  • Intraepithelial γδ T lymphocytes (γδ IEL) are vital for epithelial repair at barrier sites.
  • The specific molecular mechanisms regulating γδ IEL function in the intestine are not fully understood.
  • Previous studies highlighted CD100-plexin B2 interactions in skin γδ T cell function.

Purpose of the Study:

  • To investigate the role of the semaphorin CD100 in intestinal γδ IEL function and colon epithelial repair.
  • To determine if CD100 signaling is involved in the response to inflammatory conditions like colitis.

Main Methods:

  • Utilized a dextran sulfate sodium (DSS)-induced mouse model of colitis.
  • Analyzed CD100 expression on intestinal epithelial cells and plexin B2 on colon epithelial cells.
  • Compared disease severity and colon epithelial proliferation in wild-type and CD100-deficient (CD100(-/-)) mice.
  • Assessed γδ IEL production of keratinocyte growth factor-1 (KGF-1) in response to DSS treatment.
  • Investigated the therapeutic effect of recombinant KGF-1 administration in CD100(-/-) mice.

Main Results:

  • CD100 is expressed on intestinal epithelial lymphocytes (IEL), and plexin B2 is present on colon epithelial cells.
  • CD100(-/-) mice exhibited exacerbated colitis severity, characterized by increased colon ulceration and inflammation.
  • Colon epithelial cells in CD100(-/-) mice failed to proliferate adequately in response to DSS-induced damage.
  • γδ IEL from CD100(-/-) mice did not produce KGF-1 upon DSS treatment, unlike wild-type γδ IEL.
  • Recombinant KGF-1 administration ameliorated colitis symptoms and reversed disease susceptibility in CD100(-/-) mice.

Conclusions:

  • CD100-mediated signaling is essential for the activation of γδ IEL to produce KGF-1.
  • KGF-1 is critical for the proliferative response and healing of the colon epithelium during colitis.
  • The CD100-γδ IEL axis represents a key pathway for maintaining intestinal barrier integrity and promoting colitis resolution.