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XIAP and PHB1 Regulate Anoikis through Competitive Binding to TRAF6

Bo Yang1, Chao Lou1, Shengkai Chen1

  • 1Department of Oral and Maxillofacial-Head Neck Oncology, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, National Clinical Research Center for Oral Diseases, Shanghai Key Laboratory of Stomatology, Shanghai Research Institute of Stomatology, Shanghai, China.

Molecular Cancer Research : MCR
|November 8, 2022
PubMed

Insights

Tumor cells resist anoikis, or cell death, through prohibitin 1 (PHB1) competing with XIAP to stabilize TRAF6. This mechanism promotes tumor cell survival and metastasis, identifying PHB1 and TRAF6 as therapeutic targets.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Death Mechanisms

Background:

  • Anoikis resistance is crucial for circulating tumor cell survival.
  • The molecular mechanisms driving anoikis resistance remain largely undefined.
  • Tumor cell dissemination and metastasis depend on overcoming anoikis.

Purpose of the Study:

  • To investigate the role of TNF receptor-associated factor 6 (TRAF6)-induced NF-κB activation in anoikis susceptibility.
  • To identify TRAF6-binding proteins that modulate anoikis resistance in tumor cells.
  • To elucidate novel molecular pathways governing anoikis and tumor cell survival.

Main Methods:

  • Differential screening of TRAF6-binding proteins in anoikis-sensitive versus resistant cells using LC/MS-MS.
  • Assessment of TRAF6 stability, NF-κB signaling activation, and anoikis susceptibility.
  • In vivo studies involving PHB1 and TRAF6 knockdown to evaluate tumor cell circulation and metastasis.

Main Results:

  • Loss of TRAF6 expression is linked to anoikis sensitivity.
  • X-linked inhibitor of apoptosis protein (XIAP) binds, ubiquityinates, and degrades TRAF6, promoting anoikis sensitivity.
  • Prohibitin 1 (PHB1) competes with XIAP for TRAF6 binding, conferring anoikis resistance.
  • PHB1 and TRAF6 knockdown reduced circulating tumor cells in vivo.
  • Elevated PHB1 and TRAF6 expression correlated with distant metastasis in oral cancer patients.

Conclusions:

  • A novel mechanism of anoikis regulation involving PHB1, XIAP, and TRAF6 was elucidated.
  • PHB1 stabilizes TRAF6 by competing with XIAP, thereby conferring anoikis resistance.
  • TRAF6 and PHB1 represent potential therapeutic targets for inhibiting tumor cell dissemination.

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