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Pursuing different 'TRADDes': TRADD signaling induced by TNF-receptor 1 and the Epstein-Barr virus oncoprotein LMP1

Arnd Kieser1

  • 1Abteilung Genvektoren, Helmholtz Zentrum München - Deutsches Forschungszentrum für Gesundheit und Umwelt, Marchioninistrasse 25, D-81377 München, Germany. a.kieser@helmholtz-muenchen.de

Biological Chemistry
|August 21, 2008
PubMed

Insights

Tumor necrosis factor receptor-associated death domain (TRADD) protein is key in TNF-receptor 1 (TNFR1) signaling, mediating apoptosis. However, Epstein-Barr virus

Area of Science:

  • Molecular Biology
  • Cellular Signaling
  • Virology

Background:

  • Tumor necrosis factor (TNF)-receptor 1-associated death domain (TRADD) is a critical signaling adapter for TNF-receptor 1 (TNFR1).
  • TRADD mediates TNFR1-induced apoptosis and activation of NF-kappaB and JNK pathways.
  • Epstein-Barr virus' latent membrane protein 1 (LMP1) is a viral oncoprotein crucial for B-cell transformation.

Purpose of the Study:

  • To provide an overview of TRADD's dual role in TNFR1 and LMP1 signaling pathways.
  • To highlight TRADD's function in both apoptotic (TNFR1) and transforming (LMP1) signaling.
  • To incorporate recent findings from TRADD RNA interference (RNAi) and knockout studies.

Main Methods:

  • Review of existing literature on TNFR1 and LMP1 signal transduction.
  • Analysis of TRADD's recruitment and interaction mechanisms with TNFR1 and LMP1.
  • Incorporation of data from TRADD RNAi and knockout studies.

Main Results:

  • TRADD is recruited to TNFR1 via death domain interaction, initiating apoptosis and NF-kappaB/JNK signaling.
  • TRADD is also recruited by LMP1, but independently of a functional death domain.
  • The LMP1-TRADD complex promotes NF-kappaB signaling distinct from TNFR1 and inhibits TRADD-mediated apoptosis.

Conclusions:

  • TRADD acts as a central adapter protein with divergent functions depending on the receptor context.
  • LMP1 subverts TRADD signaling, promoting viral-driven transformation and inhibiting apoptosis.
  • Understanding these distinct TRADD-mediated pathways is crucial for targeting viral oncogenesis.

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