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Death receptor signaling and autoimmunity.

Richard M Siegel1, Jagan Muppidi, Margaret Roberts

  • 1Immunoregulation Section, Autoimmunity Branch, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institute of Health, Bethesda, MD 20892, USA. rsiegel@nih.gov

Immunologic Research
|July 15, 2003
PubMed
Summary

Immune system self-nonself discrimination relies on pathogen sensors and regulators of cell death, like Fas receptors. Defects in these pathways disrupt immune homeostasis and lead to autoimmunity.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • Immune self-nonself discrimination is mediated by ligand-receptor systems, including toll-like receptors and tumor necrosis factor (TNF) family receptors.
  • These receptor families utilize shared signaling pathways involving cytoplasmic proteins with death and TRAF domains, regulating apoptosis and inflammation.
  • Genetic defects in Fas, a TNF-receptor superfamily member, lead to lymphocyte accumulation and autoimmunity, underscoring its role in immune homeostasis.

Purpose of the Study:

  • Investigate the regulation of apoptosis susceptibility through death receptors.
  • Elucidate the function of Fas and related death receptors in maintaining immune self-tolerance and homeostasis.
  • Explore nonapoptotic lymphocyte activation signals that utilize death receptor signaling components.

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Main Methods:

  • Analysis of genetic defects in TNF-receptor family members.
  • Study of signaling pathways involving death and TRAF domains.
  • Investigation of lymphocyte apoptosis and activation.

Main Results:

  • Fas receptor is crucial for immunoreceptor-mediated apoptosis of activated T and B lymphocytes.
  • Six TNF-receptor superfamily members share a death domain, linking them to the apoptotic machinery and termed 'death receptors'.
  • Genetic defects in Fas result in abnormal lymphocyte accumulation and systemic autoimmunity.

Conclusions:

  • Death receptors, including Fas, play a critical role in immune system homeostasis and self-tolerance.
  • Understanding death receptor signaling is key to addressing autoimmune diseases and immune dysregulation.
  • Further research is needed to fully comprehend the regulation and nonapoptotic functions of death receptors in immune cells.