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[Down-regulation of miR-21 expression enhances the radiosensitivity of TE-1 cells in vitro]

Xiaoqing Li1, Xin Chen, Shan Huang

  • 1Department of Radiotherapy, First Affiliated Hospital of Xi'an Jiaotong University College of Medicine, Xi'an, China. Lixiaoqing_1221@126.com

Nan Fang Yi Ke Da Xue Xue Bao = Journal of Southern Medical University
|November 24, 2012
PubMed
Abstract

Insights

Down-regulating miR-21 enhances radiosensitivity in TE-1 cells. This effect may involve the wnt/β-catenin pathway and reduced p75NTR positive cells, offering potential therapeutic strategies.

Area of Science:

  • Molecular Biology
  • Oncology
  • Cell Biology

Context:

  • MicroRNA-21 (miR-21) is implicated in cancer progression and radioresistance.
  • Esophageal squamous cell carcinoma (TE-1 cells) exhibit varying responses to radiotherapy.
  • Understanding miR-21's role is crucial for improving cancer treatment efficacy.

Purpose:

  • To investigate the impact of miR-21 down-regulation on the radiosensitivity of TE-1 cells.
  • To explore the underlying mechanisms, including the wnt/β-catenin pathway and p75NTR expression.

Summary:

  • TE-1 cells with stably down-regulated miR-21 (TE-1-miR21(-)) were generated using lentiviral transfection.
  • Radiosensitivity was assessed via colony formation assay, showing enhanced sensitivity in TE-1-miR21(-) cells.
  • While β-catenin mRNA levels remained unchanged, protein expression was suppressed by irradiation; p75NTR positive cell proportion decreased.

Impact:

  • miR-21 down-regulation significantly enhances the radiosensitivity of TE-1 cells.
  • This enhancement is potentially mediated by the inactivation of the wnt/β-catenin signaling pathway.
  • A reduced proportion of p75NTR positive cells may also contribute to increased radiosensitivity, suggesting novel therapeutic targets.

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