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Negative regulation of tumor suppressor p53 by microRNA miR-504

Wenwei Hu1, Chang S Chan, Rui Wu

  • 1Cancer Institute of New Jersey, University of Medicine and Dentistry of New Jersey, New Brunswick, NJ 08903, USA.

Molecular Cell
|June 15, 2010
PubMed

Insights

MicroRNA 504 (miR-504) directly inhibits the tumor suppressor p53 by binding to its 3' untranslated region. This regulation by miR-504 reduces p53 function, promoting tumor development.

Area of Science:

  • Molecular Biology
  • Cancer Biology
  • Genetics

Background:

  • The tumor suppressor p53 is crucial for preventing cancer through intricate cellular regulation.
  • MicroRNAs (miRNAs) are key regulators of gene expression, influencing cellular processes.
  • Understanding miRNA-mediated regulation of p53 is vital for cancer research.

Purpose of the Study:

  • To investigate the role of miR-504 in the regulation of tumor suppressor p53.
  • To elucidate the mechanism by which miR-504 affects p53 activity and function.

Main Methods:

  • Direct binding analysis of miR-504 to the p53 3' untranslated region.
  • Overexpression studies of miR-504 in cells to assess p53 protein levels and function.
  • Evaluation of p53-mediated apoptosis and cell-cycle arrest.
  • In vivo tumorigenecity assays.

Main Results:

  • miR-504 directly binds to two sites within the p53 3' untranslated region.
  • Overexpression of miR-504 leads to decreased p53 protein levels and impaired p53 functions.
  • Reduced p53 activity affects transcriptional activity, apoptosis, and cell-cycle arrest.
  • miR-504 overexpression promotes in vivo tumorigenecity.

Conclusions:

  • miR-504 acts as a direct negative regulator of human p53.
  • This miRNA-mediated regulation of p53 is a significant mechanism in cellular control.
  • The findings highlight the critical role of microRNAs in tumorigenesis and cancer development.

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