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T cell-derived interferon-γ programs stem cell death in immune-mediated intestinal damage.

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Immune T cells damage intestinal stem cells (ISCs) by releasing interferon-gamma (IFNγ), which triggers apoptosis. Blocking JAK/STAT signaling protects ISCs from this T cell-mediated injury.

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Area of Science:

  • Immunology
  • Gastroenterology
  • Stem Cell Biology

Background:

  • Intestinal stem cells (ISCs) are crucial for maintaining gut epithelial health.
  • The impact of immune-mediated damage on ISCs and their niche is not well understood.

Purpose of the Study:

  • To investigate how T cell-mediated immunopathology affects intestinal stem cells.
  • To identify the mechanisms by which T cells damage ISCs and their niche.

Main Methods:

  • Allogeneic bone marrow transplantation (BMT) models in mice.
  • Ex vivo epithelial cultures with human and murine organoids.
  • Interferon-gamma (IFNγ) and JAK/STAT signaling pathway analysis.
  • Genetic modification of T cells, IFNγ, and IFNγ receptors.

Main Results:

  • T cell infiltration in the gut after BMT primarily targets the crypt region, damaging ISCs.
  • Activated T cells induce ISC depletion and organoid death via interferon-gamma (IFNγ).
  • IFNγ triggers JAK1/STAT1-dependent apoptosis in ISCs, independent of Paneth cells.
  • Blocking IFNγ, IFNγ receptor, or JAK/STAT signaling protects ISCs from T cell-mediated damage.

Conclusions:

  • Dysregulated T cell activation and IFNγ production are key drivers of ISC injury.
  • Targeting JAK/STAT signaling in ISCs can prevent T cell-mediated stem cell damage.
  • Understanding these mechanisms is vital for treating intestinal inflammatory diseases.