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MicroRNA-125b regulates proliferation and radioresistance of oral squamous cell carcinoma

M Shiiba1, K Shinozuka, K Saito

  • 1Department of Clinical Molecular Biology, Graduate School of Medicine, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8670, Japan. m.shiiba@faculty.chiba-u.jp

British Journal of Cancer
|April 18, 2013
PubMed
Abstract

Insights

Downregulated microRNA-125b (miR-125b) expression in oral squamous cell carcinoma (OSCC) correlates with increased proliferation and radioresistance, likely via ICAM2 signaling. Restoring miR-125b may overcome resistance.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Genetics

Background:

  • MicroRNAs (miRNAs) regulate biological processes and are differentially expressed in cancers.
  • Intercellular adhesion molecule-2 (ICAM2) inhibition radiosensitizes oral squamous cell carcinoma (OSCC).
  • Hypothesis: miRNAs regulate OSCC radioresistance by modulating ICAM2.

Purpose of the Study:

  • Investigate the role of microRNA-125b (miR-125b) in OSCC radioresistance.
  • Determine if miR-125b regulates ICAM2 expression.

Main Methods:

  • Predicted miR-125b targeting of ICAM2 mRNA.
  • Quantified miR-125b expression using real-time RT-PCR in OSCC cells and samples.
  • Functional analysis via miR-125b transfection into OSCC cells.

Main Results:

  • miR-125b was downregulated in OSCC cell lines and patient samples.
  • Transfected cells exhibited reduced proliferation, increased radiosensitivity, and decreased ICAM2 mRNA.
  • miR-125b expression correlated with OSCC tumor stage and patient survival.

Conclusions:

  • Downregulated miR-125b is linked to OSCC proliferation and radioresistance, likely through ICAM2 signaling.
  • Modulating miR-125b may offer a strategy to suppress proliferation and enhance radiosensitivity in OSCC.

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