MicroRNA-646 inhibits proliferation and cell cycle progression of nasopharyngeal carcinoma cells by targeting mTOR

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Analysis of Combinatorial miRNA Treatments to Regulate Cell Cycle and Angiogenesis
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Y-L Song1, M-Z Pan, A-L Wang

  • 1Department of Otolaryngology, The Seventh People's Hospital of Jinan, Jinan, China. 13953190521@163.com.

European Review for Medical and Pharmacological Sciences
|November 8, 2019
PubMed
Abstract

Insights

MicroRNA-646 is downregulated in nasopharyngeal carcinoma and inhibits tumor growth by targeting mTOR. Upregulating microRNA-646 can suppress cancer cell proliferation and progression, offering a potential therapeutic strategy for nasopharyngeal carcinoma.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Nasopharyngeal carcinoma (NPC) is a prevalent cancer in certain regions.
  • Understanding the molecular mechanisms regulating NPC progression is crucial for developing effective treatments.

Purpose of the Study:

  • To investigate the role of microRNA-646 (miR-646) in regulating the proliferation and cell cycle of nasopharyngeal carcinoma cells.
  • To determine if miR-646 targets the mammalian target of rapamycin (mTOR) pathway in NPC.

Main Methods:

  • Quantitative Real-time polymerase chain reaction (qRT-PCR) to assess miR-646 and mTOR expression.
  • Cell counting kit-8 (CCK-8) assay and flow cytometry to evaluate proliferation and cell cycle.
  • Dual-luciferase reporter gene assay and Pearson correlation analysis to confirm the miR-646-mTOR interaction.
  • Gain-of-function experiments to elucidate miR-646's regulatory role.

Main Results:

  • MicroRNA-646 was significantly downregulated in NPC tissues and cell lines.
  • Low miR-646 expression correlated with poorer survival in NPC patients.
  • Overexpression of miR-646 inhibited NPC cell proliferation and induced cell cycle arrest.
  • miR-646 directly targets mTOR, which was found to be upregulated in NPC.
  • mTOR overexpression reversed the inhibitory effects of miR-646.

Conclusions:

  • MicroRNA-646 acts as a tumor suppressor in nasopharyngeal carcinoma.
  • miR-646 inhibits NPC cell proliferation and cell cycle progression by targeting mTOR.
  • Restoring miR-646 levels may represent a therapeutic strategy for NPC.

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