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Related Experiment Videos

Structure and function of Fas/Fas ligand.

J R Orlinick1, A K Vaishnaw, K B Elkon

  • 1Hospital for Special Surgery, Cornell University Medical Center, New York, NY 10021, USA.

International Reviews of Immunology
|January 8, 2000
PubMed
Summary

The Fas/Fas ligand pathway is crucial for immune system regulation. Defects in this pathway can lead to autoimmune disorders, highlighting its importance in preventing self-reactivity.

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Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Fas is a tumor necrosis factor (TNF) receptor family member with cysteine-rich domains (CRDs) and a death domain.
  • The death domain facilitates signal transduction via adaptor molecules, involving caspases, ceramides, and stress pathways.
  • Fas ligand (FasL) functions as a homotrimer, with binding sites at the C-terminus and self-association motif at the N-terminus.

Purpose of the Study:

  • To elucidate the structural and functional characteristics of the Fas/Fas ligand pathway.
  • To understand the regulatory mechanisms governing FasL expression and activity.
  • To explore the role of the Fas/FasL pathway in immune system homeostasis and autoimmune disease pathogenesis.

Main Methods:

  • Analysis of TNF receptor family structure, focusing on Fas and its ligand.
  • Investigation of signal transduction pathways initiated by Fas receptor activation.
  • Examination of FasL expression regulation at transcriptional and post-translational levels (metalloproteinase cleavage).

Main Results:

  • Fas possesses a death domain essential for transmitting apoptotic signals.
  • FasL activity is regulated by its trimeric structure and expression control.
  • The Fas/FasL pathway is critical for deleting activated immune cells in the periphery.

Conclusions:

  • The Fas/Fas ligand system is a key regulator of peripheral immune tolerance.
  • Dysfunction in the Fas/FasL pathway compromises immune homeostasis and increases susceptibility to autoimmune disorders.

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