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Development of Stem Cell-derived Antigen-specific Regulatory T Cells Against Autoimmunity
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TCR affinity and negative regulation limit autoimmunity.

Matthew A Gronski1, Jonathan M Boulter, Demetrius Moskophidis

  • 1Institute for Breast Cancer Research, Ontario Cancer Institute, Departments of Medical Biophysics and Immunology, University of Toronto, Toronto, Ontario M5G 2C1, Canada.

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|October 7, 2004
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Summary
This summary is machine-generated.

T-cell receptor (TCR) affinity for activating ligands significantly impacts autoimmune disease incidence. Lower affinity and intact negative immune regulation reduce autoimmunity, even with T-cell activation.

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Area of Science:

  • Immunology
  • Autoimmunity research
  • Molecular mimicry

Background:

  • Autoimmune diseases involve self-reactive T cells causing immunopathology.
  • Molecular mimicry suggests pathogens can activate self-reactive T cells via cross-reactive ligands.

Purpose of the Study:

  • To model and investigate the influence of T-cell receptor (TCR) affinity on autoimmunity.
  • To understand how ligand affinity impacts T-cell activation and disease development.

Main Methods:

  • Development of a model system to study TCR-ligand affinity.
  • Analysis of autoimmunity incidence with varying TCR affinities.
  • Investigation of T-cell responses and insulitis in the absence of Cbl-b.

Main Results:

  • A fivefold decrease in TCR affinity reduced autoimmunity by 50%.
  • Significantly lower TCR affinity (20x) did not induce autoimmunity, despite T-cell activation and insulitis.
  • Absence of Cbl-b led to 100% autoimmunity upon infection with lower-affinity ligands.

Conclusions:

  • Autoimmune disease susceptibility is modulated by TCR-ligand affinity.
  • Normal immune regulatory mechanisms, like Cbl-b, are crucial in preventing autoimmunity.
  • Both ligand affinity and immune regulation determine autoimmune disease outcomes.