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Related Experiment Videos

NF-kappa B-dependent Fas ligand expression.

S C Hsu1, M A Gavrilin, H H Lee

  • 1Graduate Institute of Microbiology, National Taiwan University School of Medicine, Taipei, Taiwan.

European Journal of Immunology
|October 3, 1999
PubMed
Summary

Cyclic AMP (cAMP) suppresses T cell apoptosis by inhibiting Fas ligand (FasL) expression, primarily by blocking NF-kappaB activation. This reveals NF-kappaB as a key mediator in FasL induction during T cell activation and stress responses.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • Lymphocyte apoptosis is crucial for immune regulation and is triggered by stimuli inducing Fas and Fas ligand (FasL) expression.
  • T cell activation involves complex signaling pathways regulating the expression of apoptosis-related molecules.

Purpose of the Study:

  • To investigate the differential regulation of Fas and Fas ligand (FasL) expression during T cell activation.
  • To elucidate the role of cyclic AMP (cAMP) and transcription factors, particularly NF-kappaB, in controlling FasL expression and T cell apoptosis.

Main Methods:

  • Utilized T cell activation as a model system to study Fas/FasL expression.
  • Analyzed the impact of cAMP on T cell apoptosis and FasL promoter activity.
  • Investigated the role of transcription factors NF-kappaB, NF-AT, and AP-1 using reporter assays and overexpression studies.

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Main Results:

  • cAMP effectively suppressed T cell activation-induced apoptosis by inhibiting TCR-coupled FasL expression.
  • cAMP had a weaker effect on Fas expression, with remaining Fas molecules still mediating apoptosis.
  • cAMP suppressed NF-kappaB activation on the FasL promoter, while NF-AT and AP-1 were less affected.
  • Overexpression of p65 (RelA), a component of NF-kappaB, enhanced FasL promoter activity and expression, highlighting NF-kappaB's critical role.

Conclusions:

  • NF-kappaB is essential for the expression of the death receptor ligand FasL.
  • A direct link exists between NF-kappaB activation and FasL expression.
  • NF-kappaB may serve as a common mediator for FasL induction through T cell receptor activation and various stress stimuli.