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Updated: May 10, 2026

Studying TGF-β Signaling and TGF-β-induced Epithelial-to-mesenchymal Transition in Breast Cancer and Normal Cells
06:54

Studying TGF-β Signaling and TGF-β-induced Epithelial-to-mesenchymal Transition in Breast Cancer and Normal Cells

Published on: October 27, 2020

TRAF2 regulates the cytoplasmic/nuclear distribution of TRAF4 and its biological function in breast cancer cells

Xiaoli Zhang1, Zhifeng Wen, Limei Sun

  • 1Department of Pathology, The First Affiliated Hospital and College of Basic Medical Sciences of China Medical University, Shenyang 110001, China.

Biochemical and Biophysical Research Communications
|June 8, 2013
PubMed

Insights

Tumor necrosis factor receptor-associated factor 2 (TRAF2) interacts with TRAF4, influencing its cellular location in breast cancer. TRAF2 overexpression promotes cell proliferation and inhibits apoptosis by activating NF-κB signaling.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Tumor necrosis factor receptor-associated factor 4 (TRAF4) is implicated in various cancers, but its precise role and regulation are not fully understood.
  • Understanding the molecular mechanisms of TRAF4 in carcinogenesis is crucial for developing targeted therapies.

Purpose of the Study:

  • To investigate the regulatory role of TRAF2 on the cytoplasmic and nuclear distribution of TRAF4 in breast cancer cell lines.
  • To elucidate the downstream signaling pathways affected by TRAF2-TRAF4 interactions.

Main Methods:

  • Immunofluorescence staining to assess co-localization of TRAF2 and TRAF4.
  • Co-immunoprecipitation to confirm protein-protein interactions.
  • siRNA-mediated gene silencing and plasmid transfection to manipulate protein expression levels.
  • Western blotting to analyze protein expression and localization.
  • NF-κB nuclear translocation assays.

Main Results:

  • TRAF2 and TRAF4 were found to co-localize in the cytoplasm and interact in multiple breast cancer cell lines.
  • TRAF2 depletion led to decreased cytoplasmic TRAF4 and increased nuclear TRAF4.
  • TRAF2 overexpression enhanced cytoplasmic TRAF4, increased cell proliferation, and inhibited apoptosis.
  • TRAF2-mediated TRAF4 regulation influenced NF-κB activation, with TRAF4 potentially playing a role in TRAF2-induced NF-κB activation.

Conclusions:

  • TRAF2 interacts with TRAF4 and modulates its subcellular localization in breast cancer cells.
  • TRAF2-induced TRAF4 cytoplasmic expression promotes cell proliferation and inhibits apoptosis, likely through activation of the NF-κB pathway.
  • TRAF4 may be a key mediator in TRAF2-driven NF-κB activation and subsequent oncogenic effects.

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