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MicroRNA-21 inhibits p57Kip2 expression in prostate cancer

Sweta Mishra, Chun-Lin Lin, Tim H-M Huang

  • 1Department of Cellular and Structural Biology, University of Texas Health Science Center, 7703 Floyd Curl Drive, Mail Code 7762, San Antonio, TX 78229-3900, USA. sunl@uthscsa.edu.

Molecular Cancer
|September 14, 2014
PubMed
Abstract

Insights

MicroRNA-21 (miR-21) downregulates the tumor suppressor p57(Kip2) in prostate cancer by targeting its coding region. This interaction reveals a new mechanism for cancer development and a novel oncogenic role for miR-21.

Area of Science:

  • Molecular Biology
  • Oncology
  • Gene Regulation

Background:

  • p57(Kip2) is a cyclin-dependent kinase inhibitor and a potential tumor suppressor.
  • Decreased p57(Kip2) expression is common in various cancers, including prostate cancer.
  • Mutations in p57(Kip2) are rare, suggesting other regulatory mechanisms are involved.

Purpose of the Study:

  • To investigate the molecular mechanisms behind p57(Kip2) downregulation in prostate cancer.
  • To determine the role of microRNA-21 (miR-21) in regulating p57(Kip2) expression.

Main Methods:

  • Correlation analysis between p57(Kip2) and miR-21 expression in prostate cancer samples.
  • In vitro studies using prostate cancer cells to assess miR-21 targeting of p57(Kip2).
  • Experiments involving anti-miR-21 inhibitors and p57(Kip2) knockdown.

Main Results:

  • A significant negative correlation was observed between p57(Kip2) and miR-21 expression.
  • miR-21 directly targets the coding region of p57(Kip2), reducing its mRNA and protein levels.
  • Inhibition of miR-21 increased p57(Kip2) expression and reversed effects on cell migration and growth.

Conclusions:

  • miR-21 downregulates p57(Kip2) expression and its functional responses in prostate cancer.
  • p57(Kip2) is identified as a novel target of miR-21 in prostate cancer.
  • This study reveals a new oncogenic function for miR-21 in prostate cancer development.

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