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Protumorigenic effects of mir-145 loss in malignant pleural mesothelioma

M Cioce1, F Ganci2, V Canu2

  • 1Department of Cardiothoracic Surgery, NYU Langone Medical Center, New York, NY, USA.

Oncogene
|November 19, 2013
PubMed

Insights

MicroRNA-145 (miR-145) is downregulated in malignant pleural mesothelioma (MPM) due to hyper-methylation. Restoring miR-145 levels inhibits MPM cell growth and chemoresistance by targeting OCT4.

Area of Science:

  • Oncology
  • Molecular Biology
  • Epigenetics

Background:

  • Mesothelioma is a rare cancer with limited treatment options.
  • MicroRNAs (miRNAs) play crucial roles in cancer development and progression.
  • Identifying novel biomarkers and therapeutic targets for mesothelioma is essential.

Purpose of the Study:

  • To investigate the role of differentially expressed miRNAs in benign versus malignant mesothelial tissues.
  • To elucidate the function and mechanism of miR-145 in malignant pleural mesothelioma (MPM).
  • To explore the therapeutic potential of miR-145 in MPM.

Main Methods:

  • Differential expression analysis of miRNAs in mesothelial tissues and cell lines.
  • Assessment of miR-145 levels and its correlation with promoter hyper-methylation in MPM.
  • In vitro studies using miR-145 agonists to evaluate effects on MPM cell properties (clonogenicity, migration, chemoresistance).
  • Investigation of the miR-145 targeting mechanism involving OCT4 and ZEB1.

Main Results:

  • miR-145 was significantly downregulated in malignant mesothelial tissues and MPM cell lines.
  • Promoter hyper-methylation was identified as a cause for low miR-145 levels in MPM.
  • miR-145 restoration reduced MPM cell clonogenicity, migration, and pemetrexed resistance.
  • miR-145 induced accelerated senescence in MPM cells by targeting OCT4 and its downstream gene ZEB1.
  • The miR-145-OCT4 interaction is critical for MPM cell survival.

Conclusions:

  • miR-145 acts as a tumor suppressor in MPM, with its downregulation mediated by hyper-methylation.
  • Restoring miR-145 levels holds therapeutic potential for MPM by inhibiting cell proliferation and overcoming chemoresistance.
  • miR-145 levels may serve as a biomarker for distinguishing benign from malignant mesothelial tissues.

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