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MicroRNA Detection in Prostate Tumors by Quantitative Real-time PCR qPCR
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MiR-203 down-regulates Rap1A and suppresses cell proliferation, adhesion and invasion in prostate cancer

Jun Xiang1, Cuidong Bian2, Hao Wang3

  • 1Department of Urology, Tongji Hospital, Tongji University School of Medicine, NO 389 Xinchun road, Shanghai, 200065, China. zhuxufifa2007@163.com.

Journal of Experimental & Clinical Cancer Research : CR
|February 1, 2015
PubMed
Abstract

Insights

MicroRNA-203 (miR-203) inhibits prostate cancer (PCa) metastasis by targeting Rap1A. Downregulation of miR-203 promotes PCa cell proliferation, adhesion, and invasion, underscoring its tumor-suppressive role.

Area of Science:

  • Molecular Biology
  • Oncology
  • Gene Regulation

Background:

  • MicroRNA-203 (miR-203) is implicated in regulating prostate cancer (PCa) cell proliferation, migration, and invasion.
  • The precise molecular mechanisms of miR-203 in PCa progression remain incompletely understood.

Purpose of the Study:

  • To elucidate the role and underlying mechanisms of miR-203 in prostate cancer.
  • To investigate the regulatory relationship between miR-203 and its potential targets in PCa.

Main Methods:

  • Quantitative real-time PCR (qRT-PCR) to assess miR-203 expression in PCa tissues and cell lines.
  • In vitro assays (CCK-8, adhesion, transwell invasion) to evaluate the functional impact of miR-203 and Rap1A on PCa cells.
  • Luciferase reporter assay to confirm direct binding of miR-203 to Rap1A mRNA.
  • In vivo tumor growth assessment in nude mice.

Main Results:

  • miR-203 expression was significantly downregulated in prostate cancer specimens.
  • miR-203 suppressed PCa cell proliferation, adhesion, invasion, and tumor growth in vitro and in vivo.
  • Rap1A was identified as a direct target of miR-203, with an inverse expression correlation in PCa.
  • Rap1A knockdown mimicked miR-203's suppressive effects, while Rap1A overexpression partially reversed them.

Conclusions:

  • miR-203 acts as a tumor suppressor in prostate cancer by inhibiting metastasis.
  • Suppression of Rap1A expression by miR-203 is a key mechanism underlying its anti-metastatic effects in PCa.

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