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An Orthotopic Murine Model of Human Prostate Cancer Metastasis
06:48

An Orthotopic Murine Model of Human Prostate Cancer Metastasis

Published on: September 18, 2013

TMPRSS2-ERG-mediated feed-forward regulation of wild-type ERG in human prostate cancers

Ram-Shankar Mani1, Matthew K Iyer, Qi Cao

  • 1Michigan Center for Translational Pathology, University of Michigan Medical School, Ann Arbor, Michigan 48109, USA.

Cancer Research
|June 17, 2011
PubMed

Insights

The TMPRSS2-ERG gene fusion drives overexpression of wild-type ERG in prostate cancer. This overexpression is linked to increased cancer invasiveness, offering new insights into ERG regulation.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Recurrent ETS gene fusions are hallmarks of prostate cancer, with TMPRSS2-ERG being the most prevalent.
  • While TMPRSS2-ERG fusion transcripts are understood, the regulation of wild-type ERG in prostate cancer remains unclear.

Purpose of the Study:

  • To investigate the regulatory mechanisms of wild-type ERG expression in prostate cancer.
  • To determine the functional and clinical significance of wild-type ERG overexpression driven by TMPRSS2-ERG fusions.

Main Methods:

  • Integrative analysis of gene expression and genomic data.
  • Gene knockdown and overexpression studies in prostate cancer cell lines (VCaP and PC3).
  • Analysis of wild-type ERG expression in clinical prostate cancer samples.

Main Results:

  • The TMPRSS2-ERG fusion protein binds to the ERG locus, driving wild-type ERG overexpression.
  • Knockdown of TMPRSS2-ERG reduced wild-type ERG transcription, while its overexpression increased it.
  • Androgen signaling modulates TMPRSS2-ERG, consequently upregulating wild-type ERG.
  • Loss of wild-type ERG expression correlated with reduced cellular invasion.
  • Overexpression of wild-type ERG was observed in 38% of localized and 27% of metastatic prostate cancers with TMPRSS2-ERG fusions.

Conclusions:

  • The TMPRSS2-ERG fusion is a key driver of wild-type ERG overexpression in prostate cancer.
  • Wild-type ERG overexpression, regulated by TMPRSS2-ERG and androgen signaling, may contribute to prostate cancer progression and invasiveness.
  • These findings elucidate a novel regulatory pathway for ERG in prostate cancer.

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