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MicroRNA Detection in Prostate Tumors by Quantitative Real-time PCR qPCR
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Micro-RNA-204 Participates in TMPRSS2/ERG Regulation and Androgen Receptor Reprogramming in Prostate Cancer

Krassimira Todorova1, Metodi V Metodiev2, Gergana Metodieva2

  • 1Institute of Biology and Immunology of Reproduction "Acad. Kiril Bratanov", Laboratory of Reproductive OMICs Technologies, Bulgarian Academy of Sciences, 73 Tsarigradsko shosse blvd, 1113, Sofia, Bulgaria.

Hormones & Cancer
|January 5, 2017
PubMed

Insights

MicroRNA-204 (miR-204) regulates TMPRSS2/ERG oncofusion and androgen receptor (AR) signaling in prostate cancer. It acts as a tumor suppressor by inhibiting TMPRSS2/ERG and upregulating AR, with implications for cancer progression.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Cancer progression involves genome instability and rearrangements like TMPRSS2/ERG fusions.
  • MicroRNAs (miRNAs) can exhibit dual roles, acting as tumor suppressors or oncogenes.
  • Previous studies indicated miR-204 has context-dependent effects in ERG fusion-positive cancers.

Purpose of the Study:

  • To investigate the role of miR-204 in modulating TMPRSS2/ERG and androgen receptor (AR) signaling in prostate cancer.
  • To elucidate the regulatory mechanisms of miR-204 on TMPRSS2/ERG expression and AR signaling.
  • To develop a novel method for detecting TMPRSS2/ERG protein products.

Main Methods:

  • Proximity-based ligation assay for TMPRSS2/ERG protein detection.
  • Analysis of DNA methylation, promoter activity, and gene expression.
  • Proteomics to study miR-204's role in AR reprogramming.
  • Patient serum analysis for fusion transcripts and protein products.

Main Results:

  • miR-204 negatively regulates TMPRSS2/ERG oncofusion via DNA methylation of the TMPRSS2 promoter.
  • RUNX2 and ETS1 promote TMPRSS2/ERG expression and promoter hypomethylation.
  • miR-204 upregulates AR by direct promoter hypomethylation, potentiated by ERG fusion, RUNX2, and ETS1.
  • miR-204 exhibits a dual role in AR reprogramming, promoting androgen-responsive and AR target genes.

Conclusions:

  • miR-204 acts as a negative regulator of TMPRSS2/ERG oncofusion in prostate cancer.
  • miR-204 plays a significant role in modulating AR signaling, influencing AR target genes and co-regulatory molecules.
  • miR-204's methylation-dependent regulation involves chromatin remodeling and DNA methylation pathways.
  • miR-204 fine-tunes AR function during preserved AR sensitivity, crucial for ERG-fusion translocation.

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