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MicroRNA-16 modulates HuR regulation of cyclin E1 in breast cancer cells

Xun Guo1, Melanie C Connick2, Jennifer Vanderhoof3

  • 1Department of Cell Biology and Physiology, University of New Mexico Health Sciences Center, Albuquerque, NM 87131, USA. xunguo1128@gmail.com.

International Journal of Molecular Sciences
|April 2, 2015
PubMed

Insights

MicroRNA-16 (miR-16) can overcome RNA binding protein HuR

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Gene Regulation

Background:

  • RNA binding proteins (RBPs) and microRNAs (miRNAs) regulate gene expression post-transcriptionally.
  • Both RBPs and miRNAs are implicated in cancer development.
  • The interplay between RBPs and miRNAs is crucial for understanding gene regulation in cancer.

Purpose of the Study:

  • To investigate the crosstalk between the RBP HuR and miR-16 in breast cancer cells.
  • To determine how HuR and miR-16 regulate cyclin E1 expression.
  • To elucidate the mechanism by which miR-16 affects HuR-mediated cyclin E1 upregulation.

Main Methods:

  • Analysis of HuR binding to cyclin E1 mRNA 3' untranslated region (3'UTR).
  • Assessment of miR-16 repression of cyclin E1.
  • Investigation of the effects of HuR overexpression on miR-16 activity.
  • Evaluation of miR-16's impact on HuR-mediated cyclin E1 upregulation.

Main Results:

  • HuR upregulates cyclin E1 by binding to U-rich elements in its 3'UTR.
  • miR-16 represses cyclin E1 via binding to its 3'UTR.
  • HuR and miR-16 do not affect each other's expression or binding to the cyclin E1 3'UTR.
  • miR-16 overrides HuR-mediated cyclin E1 upregulation without impacting HuR's expression or binding.

Conclusions:

  • miR-16 can effectively counteract HuR-driven cyclin E1 expression in breast cancer.
  • This regulatory interaction highlights a key mechanism in post-transcriptional gene control in cancer.
  • Understanding this crosstalk is vital for developing targeted cancer therapies.

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