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Updated: Apr 17, 2026

MicroRNA Detection in Prostate Tumors by Quantitative Real-time PCR qPCR
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MiR200c targets IRS1 and suppresses prostate cancer cell growth

Wenjing Su1, Miao Xu, Xueqin Chen

  • 1Department of Pathology and Laboratory of Pathology, State Key Laboratory of Biotherapy; West China Hospital, West China Medical School, Sichuan University, Chengdu, P.R. China; Department of Pathology, Shandong Provincial Hospital, Shandong University, Jinan, P.R. China.

The Prostate
|February 17, 2015
PubMed
Abstract

Insights

MicroRNA 200c (miR200c) suppresses prostate cancer growth by regulating insulin receptor substrate 1 (IRS1). Upregulating miR200c reduces IRS1 levels, inhibiting cancer cell proliferation and promoting cell death.

Area of Science:

  • Molecular Biology
  • Oncology
  • Gene Regulation

Background:

  • The tumor suppressor miR200c is downregulated in many cancers.
  • miR200c's role in prostate cancer progression is under investigation.
  • Insulin receptor substrate 1 (IRS1) is implicated in cancer development.

Purpose of the Study:

  • To investigate miR200c as a posttranscriptional regulator of IRS1.
  • To determine the effect of miR200c overexpression on prostate cancer cell growth.

Main Methods:

  • Bioinformatics and dual reporter gene assays to predict and confirm miR200c binding sites on IRS1.
  • RT-PCR, Q-PCR, and Western blot to assess mRNA and protein level changes.
  • Cell proliferation (CCK8, soft agar, trypan blue) and apoptosis assays (flow cytometry) were employed.

Main Results:

  • Three potential miR200c binding sites were identified in the IRS1 3'-UTR.
  • miR200c directly binds to IRS1, leading to decreased mRNA and protein expression.
  • Overexpression of miR200c significantly inhibited prostate cancer cell proliferation and induced apoptosis in PC3 and DU145 cells.

Conclusions:

  • miR200c acts as a posttranscriptional regulator of IRS1 in prostate cancer.
  • The miR200c/IRS1 pathway presents a potential therapeutic target for prostate cancer treatment.

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