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Gamma delta (γδ) T cells play a role in ulcerative colitis (UC) pathogenesis. Specific γδ T cell subsets shift during UC, impacting intestinal immunity and potentially offering therapeutic targets.

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Area of Science:

  • Immunology
  • Gastroenterology
  • Cell Biology

Background:

  • Gamma delta (γδ) T cells are crucial for maintaining intestinal immune homeostasis.
  • Their specific roles and alterations in human ulcerative colitis (UC) remain unclear.

Purpose of the Study:

  • To characterize γδ T cell populations in the intestines of UC patients.
  • To understand the functional phenotypes and distribution of γδ T cells in UC.
  • To explore the relationship between γδ T cells and epithelial cells in UC.

Main Methods:

  • Single-cell RNA sequencing of intestinal biopsies.
  • T cell receptor (TCR) profiling.
  • Mass cytometry analysis.

Main Results:

  • UC is associated with a decrease in CD103+Vγ4Vδ1+ γδ T cells in the intraepithelial compartment.
  • Expansion of stem-like (TCF-1+, PD-1+) and effector-like (granzyme B+, perforin+, T-bet+) γδ T cell subsets in the lamina propria of UC patients.
  • Changes in γδ T cell composition correlate with altered expression of butyrophilin (BTN) genes in epithelial cells.
  • Peripheral blood γδ T cells also show inflammation-associated alterations.
  • Clinical improvement in UC patients led to recovery of γδ T cells and reduced inflammation.

Conclusions:

  • Distinct γδ T cell subsets exhibit both protective and pathogenic functions in UC.
  • Alterations in γδ T cell populations are linked to disease activity and epithelial cell interactions.
  • γδ T cells represent potential biomarkers and therapeutic targets for UC.