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Beyond tumor necrosis factor receptor: TRADD signaling in toll-like receptors

Nien-Jung Chen1, Iok In Christine Chio, Wen-Jye Lin

  • 1The Campbell Family Institute for Breast Cancer Research, University Health Network and Department of Medical Biophysics, University of Toronto, Toronto, ON, Canada M5G 2C1.

Proceedings of the National Academy of Sciences of the United States of America
|August 23, 2008
PubMed

Insights

Tumor necrosis factor receptor 1-associated death domain protein (TRADD) is vital for TNFalpha signaling, impacting apoptosis and immune responses. TRADD also plays a key role in Toll-like receptor signaling, highlighting its multifunctional nature in immunity.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Signaling

Background:

  • Tumor necrosis factor receptor 1-associated death domain protein (TRADD) is a critical adaptor protein.
  • TRADD is recruited to TNF receptor 1 (TNFR1) upon TNFalpha stimulation.
  • TRADD plays a role in various cellular processes including apoptosis and immune responses.

Purpose of the Study:

  • To investigate the multifaceted roles of TRADD in cellular signaling pathways.
  • To elucidate TRADD's involvement in both TNFR1 and Toll-like receptor (TLR) signaling.
  • To understand the implications of TRADD deficiency on immune cell function and inflammatory responses.

Main Methods:

  • Utilized cells from TRADD-deficient mice to assess signaling pathway activation.
  • Examined TNFalpha-mediated apoptosis, NF-kappaB, JNK, and ERK activation.
  • Investigated TRADD's role in TLR3 and TLR4 signaling pathways, including cytokine production in macrophages.

Main Results:

  • TRADD deficiency resulted in defective TNFalpha-mediated apoptosis and signaling.
  • TRADD is essential for germinal center formation, T cell costimulation, and in vivo inflammatory responses.
  • TRADD plays a novel and crucial role in TLR3 and TLR4 signaling, with TRADD-deficient macrophages exhibiting impaired cytokine production upon LPS stimulation.
  • TRADD deficiency did not affect IFNgamma-induced signaling.

Conclusions:

  • TRADD is a multifunctional protein essential for TNFR1 signaling.
  • TRADD is also a key player in TLR signaling pathways, particularly TLR4.
  • TRADD is critical for diverse immune responses, including apoptosis, inflammation, and cytokine production.

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