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Updated: Apr 12, 2026

miRNA Expression Analyses in Prostate Cancer Clinical Tissues
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miRNA Expression Analyses in Prostate Cancer Clinical Tissues

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Oncogenic Activity of miR-650 in Prostate Cancer Is Mediated by Suppression of CSR1 Expression

Ze-Hua Zuo1, Yan P Yu1, Ying Ding2

  • 1Department of Pathology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania.

The American Journal of Pathology
|May 10, 2015
PubMed

Insights

MicroRNA-650 (miR-650) suppresses the tumor suppressor gene CSR1 in prostate cancer. Inhibiting miR-650 reduces tumor growth and metastasis, offering a potential therapeutic strategy.

Area of Science:

  • Molecular Biology
  • Oncology
  • Gene Regulation

Background:

  • Cellular stress response 1 (CSR1) acts as a tumor suppressor, but its reduced expression in prostate cancer is not fully understood.
  • Prostate cancer progression is linked to complex gene regulatory mechanisms.

Purpose of the Study:

  • To elucidate the mechanism behind CSR1 down-regulation in prostate cancer.
  • To investigate the role of microRNA-650 (miR-650) in regulating CSR1 expression and its impact on prostate cancer.
  • To evaluate the therapeutic potential of targeting miR-650.

Main Methods:

  • Bioinformatic analysis to identify potential miR-650 target sites in the CSR1 3' untranslated region (UTR).
  • Luciferase reporter assays to validate the interaction between miR-650 and CSR1 3' UTR.
  • In vitro studies using prostate cancer cell lines (PC3, DU145) with miR-650 inhibition.
  • In vivo studies using a xenograft mouse model.

Main Results:

  • miR-650 directly targets the CSR1 3' UTR, leading to its down-regulation in prostate cancer.
  • Inhibition of miR-650 restored CSR1 expression, suppressed cell proliferation, and induced cell cycle arrest.
  • Targeting miR-650 significantly reduced tumor volume, metastasis, and mortality in vivo.

Conclusions:

  • miR-650 is a key oncogenic driver in prostate cancer by suppressing the tumor suppressor CSR1.
  • Inhibition of miR-650 represents a promising therapeutic strategy for prostate cancer treatment.

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