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EglN2 contributes to triple negative breast tumorigenesis by functioning as a substrate for the FBW7 tumor suppressor

Mamoru Takada1, Ming Zhuang2, Hiroyuki Inuzuka3

  • 1Lineberger Comprehensive Cancer Center, University of North Carolina School of Medicine, Chapel Hill, NC 27599, USA.

Oncotarget
|December 31, 2016
PubMed

Insights

EglN2 promotes Triple Negative Breast Cancer (TNBC) progression. Targeting EglN2 via FBW7 regulation offers a potential therapeutic strategy for TNBC, improving patient survival.

Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • EglN2 is an estrogen-inducible gene implicated in ERα-positive breast cancer.
  • The post-transcriptional regulation of EglN2 and its role in Triple Negative Breast Cancer (TNBC) are not well understood.

Purpose of the Study:

  • To investigate the role of EglN2 in TNBC progression.
  • To elucidate the molecular mechanisms regulating EglN2 stability in TNBC.
  • To explore the potential of targeting EglN2 for TNBC therapy.

Main Methods:

  • Utilized C3Tag transgenic mice and a C3Tag cell line for TNBC studies.
  • Investigated the interaction between EglN2 and FBW7 (an E3 ligase).
  • Assessed the impact of FBW7 depletion and overexpression on EglN2 levels.
  • Identified potential phosphorylation sites on EglN2 involved in FBW7 regulation.

Main Results:

  • EglN2 contributes to TNBC tumor progression; its genetic knockout improves survival in C3Tag mice.
  • FBW7, often downregulated in TNBC, negatively regulates EglN2 protein stability.
  • FBW7 depletion increases EglN2 levels, while FBW7 overexpression decreases EglN2 in a GSK3β-dependent manner.
  • Potential serine/threonine residues on EglN2's C-terminus may mediate FBW7 binding.

Conclusions:

  • EglN2 acts as an FBW7 ubiquitin ligase substrate in TNBC.
  • Targeting the FBW7-EglN2 axis presents a potential therapeutic strategy for TNBC.
  • Understanding EglN2 regulation is crucial for developing novel TNBC treatments.
Keywords:
EglN2FBW7triple negative breast cancer

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