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TRAF2 Cooperates with Focal Adhesion Signaling to Regulate Cancer Cell Susceptibility to Anoikis

Sabrina Daniela da Silva1,2, Bin Xu1, Mariana Maschietto3

  • 1Segal Cancer Centre and Lady Davis Institute for Medical Research, Sir Mortimer B. Davis-Jewish General Hospital, Departments of Medicine, Oncology, and Pharmacology and Therapeutics, Faculty of Medicine, McGill University, Montreal, Quebec, Canada.

Molecular Cancer Therapeutics
|October 31, 2018
PubMed

Insights

Tumor necrosis factor receptor-associated factor 2 (TRAF2) interacts with focal adhesion kinase (FAK) to prevent anoikis, a form of cell death. This TRAF2-FAK signaling is crucial for cancer progression and shorter survival in breast cancer patients.

Area of Science:

  • Cell biology
  • Molecular signaling
  • Cancer research

Background:

  • Tumor necrosis factor receptor-associated factor 2 (TRAF2) is vital in inflammatory and immune responses via TNF and TWEAK signaling.
  • Anoikis is a form of programmed cell death triggered by the loss of cell-matrix adhesion.
  • Focal adhesion kinase (FAK) is a key regulator of cell adhesion and survival.

Purpose of the Study:

  • To investigate the functional interaction between TRAF2 and focal adhesion (FA) signaling, specifically involving FAK.
  • To determine the role of the TRAF2-FAK interaction in regulating anoikis.
  • To explore the clinical relevance of TRAF2 and FAK coamplification in human breast cancer.

Main Methods:

  • Utilized TRAF2-proficient/deficient and FAK-proficient/deficient mouse embryonic fibroblasts.
  • Performed co-localization studies and physical interaction assays.
  • Analyzed The Cancer Genome Atlas database for genomic alterations in human breast cancer tissues.

Main Results:

  • TRAF2 physically interacts with the N-terminal region of FAK and co-localizes to cell membrane protrusions.
  • This TRAF2-FAK interaction confers resistance to anoikis in both mouse and human cells.
  • TRAF2 and FAK downregulation increases susceptibility to anoikis.
  • Coamplification of TRAF2 and FAK in breast cancer tissues predicts shorter patient survival.

Conclusions:

  • TRAF2 and FAK form a functional complex that inhibits anoikis.
  • This TRAF2-FAK signaling pathway plays a significant role in promoting cell survival and potentially cancer progression.
  • The coamplification of TRAF2 and FAK serves as a potential biomarker for poor prognosis in breast cancer.

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