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FOXA1 antagonizes EZH2-mediated CDKN2A repression in carcinogenesis.

Yu Zhang1, Tanjun Tong1

  • 1Research Center on Aging, Department of Biochemistry and Molecular Biology, Peking University Health Science Center, Beijing 100191, People's Republic of China.

Biochemical and Biophysical Research Communications
|September 30, 2014
PubMed
Summary

Forkhead box A1 (FOXA1) activates the tumor suppressor CDKN2A, counteracting EZH2-mediated repression in cancers. FOXA1 directly inhibits EZH2 activity, preventing cancer cell proliferation and promoting senescence.

Keywords:
CDKN2ACarcinogenesisEZH2FOXA1

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Area of Science:

  • Oncology
  • Molecular Biology
  • Epigenetics

Background:

  • CDKN2A (p16(INK4a)) is a critical tumor suppressor gene implicated in numerous cancers.
  • FOXA1, a forkhead transcription factor, was identified to mediate CDKN2A activation during cellular senescence.
  • The role of the FOXA1-CDKN2A axis in cancer development remained largely undetermined.

Purpose of the Study:

  • To investigate the role of the FOXA1-CDKN2A axis in carcinogenesis.
  • To elucidate the interplay between FOXA1, CDKN2A, and EZH2 in cancer.
  • To determine the mechanism by which FOXA1 influences EZH2 activity.

Main Methods:

  • Analysis of cancer microarray data to assess FOXA1 and CDKN2A expression.
  • Epistasis analysis in prostate and breast cancer cell lines.
  • Oncogenic transformation assays.
  • In vitro histone methyltransferase (HMTase) assays.

Main Results:

  • FOXA1 is downregulated in many cancers, with a positive correlation to CDKN2A in prostate and breast cancers with low EZH2.
  • FOXA1 antagonizes EZH2-mediated repression of CDKN2A, and FOXA1 depletion reverses EZH2 inhibition effects.
  • FOXA1 directly inhibits EZH2's histone methyltransferase activity via its C-terminal motif.

Conclusions:

  • FOXA1 acts as a tumor suppressor by activating CDKN2A and counteracting EZH2-driven oncogenic repression.
  • The FOXA1-CDKN2A pathway is crucial for maintaining senescence and preventing cancer progression.
  • Targeting the FOXA1-EZH2 interaction could offer novel therapeutic strategies for cancer treatment.