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A TIRF Microscopy Technique for Real-time, Simultaneous Imaging of the TCR and its Associated Signaling Proteins
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Published on: March 22, 2012

TRADD-TRAF2 and TRADD-FADD interactions define two distinct TNF receptor 1 signal transduction pathways

H Hsu1, H B Shu, M G Pan

  • 1Tularik, Incorporated, South San Francisco, California 94080, USA.

Cell
|January 26, 1996
PubMed

Insights

Tumor necrosis factor (TNF) activates pathways through TNF receptor 1 (TNFR1) and TRADD. TRADD interacts with TRAF2 for NF-kappa B activation and FADD for apoptosis, indicating pathway bifurcation.

Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Immunology

Background:

  • Tumor necrosis factor (TNF) is a key cytokine that regulates cellular processes including apoptosis and inflammation.
  • TNF exerts its effects through TNF receptor 1 (TNFR1), initiating complex intracellular signaling cascades.
  • TRADD acts as a crucial adaptor protein downstream of TNFR1, mediating the activation of distinct signaling pathways.

Purpose of the Study:

  • To elucidate the specific roles of TRADD in mediating TNF-induced apoptosis and NF-kappa B activation.
  • To identify the downstream signaling molecules that interact with TRADD to activate these separate pathways.
  • To investigate the point of divergence for the TNFR1 signaling cascades.

Main Methods:

  • Co-immunoprecipitation assays to demonstrate direct protein-protein interactions.
  • Expression of dominant-negative mutants of TRAF2 and FADD to dissect signaling pathways.
  • Assessment of NF-kappa B activation and apoptosis induction in response to TNF stimulation.

Main Results:

  • TRADD directly interacts with both TRAF2 and FADD, key signal transducers.
  • A dominant-negative TRAF2 mutant inhibited TNF-mediated NF-kappa B activation but not apoptosis.
  • A dominant-negative FADD mutant inhibited TNF-induced apoptosis but not NF-kappa B activation.

Conclusions:

  • The TNFR1 signaling pathway bifurcates at TRADD, with distinct downstream interactions mediating NF-kappa B activation and apoptosis.
  • TRAF2 is specifically involved in the NF-kappa B activation cascade downstream of TRADD.
  • FADD is specifically involved in the apoptosis induction cascade downstream of TRADD.

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