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miR-203 Inhibits Frizzled-2 Expression via CD82/KAI1 Expression in Human Lung Carcinoma Cells

Mariko Mine1, Kojiro Yamaguchi2, Tsuyoshi Sugiura2

  • 1Division of Maxillofacial Diagnostic and Surgical Sciences, Department of Oral and Maxillofacial Surgery, Graduate School of Dental Science, Kyushu University Maidashi, Higashi-ku, Fukuoka, Japan.

Plos One
|July 2, 2015
PubMed

Insights

CD82/KAI1 suppresses cancer metastasis by regulating microRNAs. It increases miR-203, which then reduces Frizzled-2 expression, inhibiting Wnt signaling and cell migration.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Signaling

Background:

  • CD82/KAI1, a tetraspanin protein, acts as a metastasis suppressor.
  • CD82 inhibits the canonical Wnt signaling pathway by downregulating Frizzled (FZD) receptors.
  • This Wnt pathway inhibition leads to beta-catenin accumulation at the cell membrane.

Purpose of the Study:

  • To investigate the mechanism by which CD82 influences Frizzled expression.
  • To examine the role of microRNAs (miRNAs) in mediating CD82's effect on FZD expression.
  • To elucidate how CD82-mediated miRNA changes impact cancer metastasis.

Main Methods:

  • Bioinformatic prediction of miRNAs targeting FZD sequences using the miRanda algorithm.
  • Quantitative analysis of miRNA expression (miR-203 and miR-338-3p) in cells with and without CD82.
  • Functional validation using miRNA mimics and inhibitors to assess effects on FZD2 mRNA and protein levels.
  • Assessment of cell migration following miRNA manipulation.

Main Results:

  • CD82 expression correlated with increased miR-203 levels (2.095-fold) and decreased miR-338-3p levels (0.354-fold).
  • Overexpression of miR-203 led to significant downregulation of FZD2 mRNA (0.268-fold) and protein (0.701-fold).
  • Inhibition of cell migration was observed upon transfection with miR-203 mimic.

Conclusions:

  • CD82 enhances miR-203 expression, which directly targets and downregulates FZD2.
  • This miR-203-mediated suppression of FZD2 inhibits Wnt signaling.
  • The findings suggest a novel mechanism for CD82 in suppressing cancer metastasis via the miR-203/FZD2/Wnt pathway axis.

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