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The epidermal growth factor receptor responsive miR-125a represses mesenchymal morphology in ovarian cancer cells

Karen D Cowden Dahl1, Richard Dahl, Jessica N Kruichak

  • 1Department of Pharmaceutical Sciences, College of Pharmacy, University of New Mexico, Albuquerque, NM 87131-0001, USA. kcowdendahl@salud.unm.edu

Neoplasia (New York, N.Y.)
|November 3, 2009
PubMed

Insights

Epidermal growth factor receptor (EGFR) signaling represses miR-125a, a microRNA that inhibits ovarian cancer cell invasion. This pathway promotes metastasis by altering microRNA expression, offering new therapeutic targets.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Biology

Background:

  • Epithelial-to-mesenchymal transition (EMT) is crucial for embryonic development and tumor metastasis.
  • MicroRNAs (miRNAs) are increasingly recognized as regulators of cancer progression and EMT.
  • Epidermal growth factor receptor (EGFR) overexpression in ovarian cancer correlates with poor prognosis and induces EMT.

Purpose of the Study:

  • To elucidate the mechanisms by which EGFR signaling influences miRNA expression in ovarian cancer.
  • To investigate the role of miR-125a in regulating EMT and invasive behavior of ovarian cancer cells.
  • To identify novel regulators of ovarian cancer metastasis.

Main Methods:

  • Analysis of EGFR signaling pathways in ovarian cancer cells.
  • Quantitative PCR to measure miRNA expression levels.
  • Western blotting to assess protein expression of transcription factors and target genes.
  • Cell morphology and invasion assays.

Main Results:

  • EGFR signaling transcriptionally represses the miRNA miR-125a via the transcription factor PEA3.
  • Overexpression of miR-125a promotes the conversion of invasive ovarian cancer cells from mesenchymal to epithelial morphology, indicating it's an EMT suppressor.
  • AT-rich interactive domain 3B (ARID3B) was identified as a direct target of miR-125a and is overexpressed in human ovarian cancers.

Conclusions:

  • EGFR-mediated repression of miR-125a is a novel mechanism driving ovarian cancer cell invasion and metastasis.
  • miR-125a acts as a tumor suppressor by inhibiting EMT and invasive phenotypes.
  • Targeting the EGFR-PEA3-miR-125a-ARID3B axis may offer therapeutic strategies for ovarian cancer.

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