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In Vivo Inhibition of MicroRNA to Decrease Tumor Growth in Mice
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In Vivo Inhibition of MicroRNA to Decrease Tumor Growth in Mice

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miR-21 downregulates the tumor suppressor P12 CDK2AP1 and stimulates cell proliferation and invasion

Jun Zheng1, Hui Xue, Tao Wang

  • 1Department of Oral and Maxillofacial Surgery, School of Stomatology, Fourth Military Medical University, 145 West Changle Road, Xi'an 710032, China.

Journal of Cellular Biochemistry
|February 18, 2011
PubMed

Insights

MicroRNAs regulate gene expression. This study found that miR-21 downregulates P12(CDK2AP1) protein, impacting cell proliferation and invasion in head and neck cancers.

Area of Science:

  • Molecular Biology
  • Oncology
  • Gene Regulation

Background:

  • MicroRNAs (miRNAs) are key regulators of gene expression.
  • P12(CDK2AP1) is a protein involved in cell cycle regulation.
  • Dysregulation of miRNAs and P12(CDK2AP1) is implicated in cancer development.

Purpose of the Study:

  • To investigate the role of miRNAs in regulating P12(CDK2AP1) expression.
  • To determine the specific miRNA targeting P12(CDK2AP1).
  • To assess the functional impact of this regulation on cancer cell behavior.

Main Methods:

  • Bioinformatic prediction of miRNA target sites.
  • Real-time RT-PCR for miRNA quantification.
  • Luciferase reporter assays to validate miRNA-target interaction.
  • Cell transfection with miRNA mimics and inhibitors.
  • Assessment of cell proliferation and invasion.
  • Analysis of patient tumor samples.

Main Results:

  • A conserved target site for miR-21 in the CDK2AP1-3'-UTR was identified.
  • miR-21 directly targets and downregulates P12(CDK2AP1) protein levels.
  • Overexpression of miR-21 suppressed reporter activity, while inhibition increased it.
  • Inhibition of miR-21 led to increased P12(CDK2AP1) protein, reduced proliferation, and decreased invasion.
  • An inverse correlation between miR-21 and P12(CDK2AP1) was observed in head and neck cancer patients.

Conclusions:

  • P12(CDK2AP1) is a direct target of miR-21.
  • miR-21 promotes proliferation and invasion by downregulating P12(CDK2AP1).
  • This miR-21/P12(CDK2AP1) axis represents a potential therapeutic target in head and neck squamous cell carcinomas.

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