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microRNA-145 suppresses lung adenocarcinoma-initiating cell proliferation by targeting OCT4

Rong Yin1, Shuai Zhang, Yaqin Wu

  • 1Department of Thoracic Surgery, Nanjing Medical University Affiliated Cancer Hospital of Jiangsu Province, Cancer Institution of Jiangsu Province, Nanjing 210009, PR China.

Oncology Reports
|April 12, 2011
PubMed

Insights

MicroRNA-145 (miR-145) acts as a tumor suppressor in lung cancer. Upregulating miR-145 inhibits lung adenocarcinoma cell proliferation and invasion by targeting OCT4, thus suppressing tumor development.

Area of Science:

  • Molecular Biology
  • Oncology
  • Biochemistry

Background:

  • MicroRNA-145 (miR-145) is frequently downregulated in human cancers.
  • Its specific role in lung cancer progression and tumorigenesis requires further elucidation.
  • Emerging evidence suggests miR-145 may possess tumor-suppressive properties.

Purpose of the Study:

  • To investigate the functional role of miR-145 in human lung adenocarcinoma.
  • To determine the impact of miR-145 upregulation on cancer cell proliferation and invasion.
  • To identify the molecular targets of miR-145 in lung cancer.

Main Methods:

  • Utilized the human lung adenocarcinoma A549 cell line.
  • Assessed the effects of miR-145 upregulation on cell proliferation, invasion, and stem cell characteristics (CD133+ cells, tumorosphere formation).
  • Employed bioinformatic analysis and luciferase reporter assays to validate miR-145 targeting of OCT4 mRNA.

Main Results:

  • Upregulation of miR-145 significantly reduced proliferation and invasion of A549 cells.
  • miR-145 overexpression decreased the proportion of CD133-positive cells and inhibited tumorosphere growth.
  • Bioinformatic predictions and experimental validation confirmed OCT4 as a direct target of miR-145.

Conclusions:

  • MicroRNA-145 functions as a tumor suppressor in human lung adenocarcinoma.
  • miR-145 inhibits lung cancer development by targeting OCT4 and impairing the proliferation of cancer-initiating cells.

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