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miRNA Expression Analyses in Prostate Cancer Clinical Tissues
11:29

miRNA Expression Analyses in Prostate Cancer Clinical Tissues

Published on: September 8, 2015

CCN3/NOV gene expression in human prostate cancer is directly suppressed by the androgen receptor

L Wu1, C Runkle1, H-J Jin1

  • 1Division of Hematology/Oncology, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL, USA.

Oncogene
|January 16, 2013
PubMed

Insights

Androgen receptor (AR) represses the tumor suppressor gene NOV in prostate cancer. Inhibiting AR and EZH2 restores NOV, reducing cancer growth and suggesting a new therapeutic strategy.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Epigenetics

Background:

  • Androgen receptor (AR) plays a critical role in prostate cancer progression.
  • Recent studies highlight AR's function as a transcriptional repressor, but mechanisms remain unclear.

Purpose of the Study:

  • To elucidate the mechanisms of AR-mediated gene repression in prostate cancer.
  • To identify AR-repressed genes and their role in tumor suppression.

Main Methods:

  • Meta-analysis of microarray data to identify androgen-repressed genes.
  • ChIP-seq to map AR-binding sites.
  • Molecular assays to assess gene expression, protein recruitment (EZH2), and epigenetic modifications (H3K27me3).
  • In vitro and in vivo functional studies using prostate cancer models.

Main Results:

  • Nephroblastoma overexpressed (NOV) identified as a top androgen-repressed gene, directly suppressed by AR.
  • AR recruits EZH2 to the NOV promoter, leading to epigenetic silencing via H3K27 tri-methylation.
  • NOV is downregulated in prostate cancer, and its expression is inversely correlated with AR and EZH2 levels.
  • NOV exhibits tumor-suppressive functions, inhibiting cell growth in vitro and in vivo.
  • Restoring NOV expression reverses androgen-induced growth and suppresses androgen-independent growth.

Conclusions:

  • AR-mediated repression of the tumor suppressor NOV is a key mechanism in prostate cancer progression.
  • AR and EZH2 cooperate to epigenetically silence NOV, promoting tumor growth.
  • NOV acts as a crucial tumor suppressor in prostate cancer.
  • Targeting AR-mediated repression of NOV may offer novel therapeutic strategies.

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