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Profiling of Estrogen-regulated MicroRNAs in Breast Cancer Cells
16:24

Profiling of Estrogen-regulated MicroRNAs in Breast Cancer Cells

Published on: February 21, 2014

Estrogen receptor {beta}1 expression is regulated by miR-92 in breast cancer

Hakeemah Al-Nakhle1, Philip A Burns, Michele Cummings

  • 1Leeds Institute of Molecular Medicine, University of Leeds, Leeds, United Kingdom.

Cancer Research
|May 21, 2010
PubMed

Insights

MicroRNA miR-92 directly targets the estrogen receptor beta1 (ERbeta1) 3'-untranslated region, leading to ERbeta1 downregulation in breast cancer. This microRNA (miRNA) pathway is a key mechanism behind reduced ERbeta1 expression in tumors.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Estrogen receptor beta1 (ERbeta1) downregulation is common in breast cancer.
  • The molecular mechanisms driving ERbeta1 loss remain largely unknown.

Purpose of the Study:

  • To investigate the role of microRNA miR-92 in regulating ERbeta1 expression in breast cancer.
  • To elucidate the molecular mechanism by which miR-92 affects ERbeta1 levels.

Main Methods:

  • Expression analysis in primary breast tumors.
  • In vitro experiments using MCF-7 cells (miR-92 inhibition and overexpression).
  • Bioinformatics analysis and reporter assays to confirm direct targeting of the ERbeta1 3 -untranslated region (UTR).

Main Results:

  • A significant negative correlation was observed between miR-92 levels and both ERbeta1 mRNA and protein in breast tumors.
  • Inhibition of miR-92 in MCF-7 cells resulted in a dose-dependent increase in ERbeta1 expression.
  • Overexpression of miR-92 led to ERbeta1 downregulation, confirming direct targeting of the ERbeta1 3 -UTR by miR-92.

Conclusions:

  • MicroRNA miR-92 directly targets the 3 -UTR of ERbeta1, leading to its downregulation.
  • This miR-92-mediated downregulation represents a significant molecular mechanism contributing to reduced ERbeta1 expression in breast cancer.

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