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TCR/CD3 coupling to Fas-based cytotoxicity

F Vignaux1, E Vivier, B Malissen

  • 1Centre d'Immunologie Institut National de la Santé et de la Recherche Médicale-Centre National de la Recherche Scientifique de Marseille-Luminy, France.

The Journal of Experimental Medicine
|February 1, 1995
PubMed
Summary

T-cell receptor (TCR)/CD3 complex engagement rapidly activates T-cell-mediated cytotoxicity via Fas ligand (Fas-L) expression. The CD3 zeta chain

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Area of Science:

  • Immunology
  • Cellular Biology
  • Molecular Biology

Background:

  • The T-cell receptor (TCR)/CD3 complex is crucial for T cell activation and function.
  • Fas-mediated cytotoxicity is a key mechanism of T cell-induced cell death.

Purpose of the Study:

  • To investigate the coupling between TCR/CD3 engagement and the induction of Fas-based T-cell-mediated cytotoxicity.
  • To elucidate the molecular signaling pathways involved in this process.

Main Methods:

  • Stimulation of T cell hybridomas and mixed lymphocyte culture cells with anti-CD3 antibody.
  • Analysis of Fas-based cytotoxicity induction and execution.
  • Investigation of the role of calcium ions and macromolecular synthesis.
  • Transfection of T cell hybridomas with constructs to study TCR/CD3 components, particularly the CD3 zeta chain.

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Main Results:

  • TCR/CD3 engagement rapidly induced Fas-based cytotoxicity.
  • Cytotoxicity induction was calcium-dependent and required macromolecular synthesis, correlating with increased Fas ligand (Fas-L) message.
  • The cytoplasmic domain of the CD3 zeta chain alone could signal for Fas-L expression, provided its ARH-1 motifs were intact.

Conclusions:

  • The TCR/CD3 complex directly couples to the induction of Fas-based T-cell-mediated cytotoxicity.
  • CD3 zeta chain signaling is critical for this induction, highlighting its role in T cell effector functions.
  • These findings contribute to understanding TCR/CD3 signal transduction and the role of Fas-mediated cytotoxicity in physiological and pathophysiological contexts.