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Heat shock protein-derived T-cell epitopes contribute to autoimmune inflammation in pediatric Crohn's disease

Gisella L Puga Yung1, Meredith Fidler, Erika Albani

  • 1Department of Medicine/Pediatrics, University of California San Diego, La Jolla, California, United States of America.

Plos One
|November 6, 2009
PubMed

Insights

Immune responses to heat shock proteins (HSP) contribute to pediatric Crohn's disease (CD) inflammation. Specific HSP epitopes trigger inflammatory cytokines, correlating with disease severity in children.

Area of Science:

  • Immunology
  • Gastroenterology
  • Pediatric Autoimmune Diseases

Background:

  • Pediatric Crohn's disease (CD) is a chronic autoimmune bowel disorder.
  • Immune dysregulation to gut antigens is implicated in CD pathogenesis.
  • Heat shock proteins (HSP) are known modulators of autoimmune inflammation.

Purpose of the Study:

  • To investigate the role of immune responses to HSP in pediatric CD.
  • To identify specific HSP-derived epitopes that drive inflammation in pediatric CD patients.

Main Methods:

  • Colonic biopsies from pediatric CD patients and healthy controls were stimulated with HSP60-derived peptides.
  • Pro-inflammatory cytokine RNA and protein levels (TNF-α, IFN-γ) were measured.
  • Immune responses were correlated with clinical and histological disease activity.

Main Results:

  • Two HSP epitopes were identified that induced significant TNF-α and IFN-γ production.
  • These responses were observed specifically in inflamed intestinal mucosa of CD patients.
  • The magnitude of the immune response correlated positively with disease severity.

Conclusions:

  • Immune responses to specific HSP epitopes contribute to site-specific mucosal inflammation in pediatric CD.
  • Targeting HSP-driven immune responses may offer a therapeutic strategy for pediatric CD.
  • This study highlights the role of HSP in the autoimmune mechanisms of pediatric Crohn's disease.

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