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MicroRNA-145 function as a cell growth repressor by directly targeting c-Myc in human ovarian cancer

Wenjing Zhang1, Qian Wang, Minglian Yu

  • 1Department of Gynecology and Obstetrics, The Military General Hospital of Beijing PLA, No. 5 Nan Men Cang, Dongcheng District, Beijing 100700, PR China. wanghuibjing@sina.cn.

Technology in Cancer Research & Treatment
|August 8, 2013
PubMed

Insights

MicroRNA-145 (miR-145) is down-regulated in ovarian cancer. Restoring miR-145 inhibits cancer cell growth and promotes cell death by targeting c-Myc, suggesting its potential as a therapeutic target.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Ovarian cancer is a significant health concern with limited effective treatments.
  • MicroRNA-145 (miR-145) has been observed to be downregulated in ovarian cancer tissues.
  • Understanding the specific roles of miR-145 in epithelial ovarian cancer (EOC) is crucial for developing novel therapeutic strategies.

Purpose of the Study:

  • To investigate the functional role of miR-145 in regulating the biological behavior of epithelial ovarian cancer (EOC) cells.
  • To determine the molecular mechanism by which miR-145 exerts its effects on EOC cells.
  • To evaluate the potential of miR-145 as a therapeutic target for ovarian cancer.

Main Methods:

  • Transfection of miR-145 mimics into OVCAR-3 and SKOV-3 EOC cell lines.
  • Cell proliferation assays (e.g., MTT assay).
  • Apoptosis assays (e.g., flow cytometry).
  • Western blotting to assess protein expression levels.
  • Luciferase reporter assays to confirm direct targeting of c-Myc.
  • Cell cycle analysis.

Main Results:

  • Up-regulation of miR-145 significantly inhibited cell proliferation and induced apoptosis in OVCAR-3 and SKOV-3 cells.
  • miR-145 was found to directly target the 3'-untranslated region (3'-UTR) of c-Myc mRNA.
  • Ectopic expression of c-Myc partially rescued the inhibitory effect of miR-145 on cell proliferation.
  • miR-145 transfection led to a reduction in the S phase cell population, which was reversed by c-Myc restoration.

Conclusions:

  • miR-145 functions as a tumor suppressor in epithelial ovarian cancer.
  • The anti-proliferative and pro-apoptotic effects of miR-145 are mediated through direct targeting of c-Myc.
  • miR-145 represents a promising molecular target for the development of novel therapeutic interventions for ovarian cancer.

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