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A role for FADD in T cell activation and development

C M Walsh1, B G Wen, A M Chinnaiyan

  • 1Department of Biology and the Cancer Center, The University of California, San Diego, La Jolla 92093-0687, USA.

Immunity
|May 20, 1998
PubMed

Insights

FAS-associated death domain (FADD) is crucial for T cell development and activation. Transgenic mice with a dominant-negative FADD mutant showed impaired T cell development and signaling defects, revealing a new role for FADD.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • FAS-associated death domain (FADD) is a key adapter protein connecting death receptors to caspase activation in apoptosis.
  • FADD plays a central role in initiating apoptotic signaling pathways.
  • Understanding FADD's function is critical for dissecting immune cell regulation and apoptosis.

Purpose of the Study:

  • To investigate the role of FADD in T cell development and activation using transgenic mouse models.
  • To determine if inhibiting FADD or downstream caspases affects thymocyte selection and T cell homeostasis.
  • To elucidate previously uncharacterized functions of FADD in the immune system.

Main Methods:

  • Generation of transgenic mice expressing a dominant-negative FADD mutant (FADDdd) lacking the death effector domain.
  • Generation of transgenic mice overexpressing the poxvirus serpin CrmA, a caspase inhibitor.
  • Analysis of thymocyte and peripheral T cell populations, apoptosis, and signaling pathways in FADDdd mice.

Main Results:

  • Thymocytes from FADDdd and CrmA-overexpressing mice were protected from CD95-dependent cytotoxicity.
  • Neither transgene protected against apoptosis during thymocyte selection, nor caused lymphoproliferative disorders.
  • FADDdd mice exhibited retarded early thymocyte development and altered peripheral T cell populations, with observed signaling anomalies.

Conclusions:

  • FADD is essential for normal T cell development and activation, beyond its known role in CD95-mediated apoptosis.
  • Inhibition of FADD leads to significant defects in T cell maturation and signaling.
  • These findings reveal a novel, critical function for FADD in T cell biology.

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