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Deubiquitination of EGFR by Cezanne-1 contributes to cancer progression

F Pareja1, D A Ferraro, C Rubin

  • 1Department of Biological Regulation, Weizmann Institute of Science, Rehovot, Israel.

Oncogene
|December 20, 2011
PubMed

Insights

Cezanne-1, a deubiquitinating enzyme, prevents epidermal growth factor receptor (EGFR) degradation, enhancing cancer growth signals. Overexpression of Cezanne-1 in breast cancer correlates with aggressive disease, highlighting its oncogenic role.

Area of Science:

  • Molecular biology
  • Cell signaling
  • Cancer research

Background:

  • Epidermal growth factor receptor (EGFR) signaling is crucial for cell growth and is often dysregulated in cancer.
  • EGFR is typically degraded after activation through ubiquitination mediated by CBL ligases.
  • Understanding regulators of EGFR stability is key to targeting cancer growth.

Purpose of the Study:

  • To identify novel regulators of EGFR stability and signaling.
  • To investigate the role of Cezanne-1 in EGFR degradation and downstream signaling.
  • To explore the clinical relevance of Cezanne-1 in breast cancer.

Main Methods:

  • RNA interference (RNAi) screens to identify deubiquitinating enzymes affecting EGFR.
  • Biochemical assays to study the interaction between Cezanne-1, EGFR, and CBL.
  • Analysis of Cezanne-1 expression and gene amplification in human breast cancer tissues.

Main Results:

  • Cezanne-1 was identified as a deubiquitinating enzyme that opposes EGFR degradation.
  • Cezanne-1's catalytic and ubiquitin-binding domains are essential for its function.
  • EGFR directly interacts with and transphosphorylates Cezanne-1, enhancing its activity.
  • Cezanne-1 overexpression and gene amplification are frequent in breast tumors and associated with poor prognosis.

Conclusions:

  • Deubiquitination by Cezanne-1 stabilizes EGFR, prolonging its signaling.
  • Cezanne-1 promotes EGF-induced growth and migration, contributing to oncogenesis.
  • Cezanne-1 represents a potential therapeutic target in cancers with EGFR pathway activation.

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