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MicroRNA-374b accelerates the development of lung cancer through downregulating PTEN expression via activating

J Li1, Z Zhou, F-C Xu

  • 1Department of Thoracic Surgery, Qianshan hospital, Anshan, China. hanyeecn@163.com.

European Review for Medical and Pharmacological Sciences
|February 20, 2019
PubMed
Abstract

Insights

MicroRNA-374b promotes lung cancer (LC) by downregulating PTEN expression, activating the PI3K/Akt pathway. Inhibiting microRNA-374b reduces LC cell migration and proliferation.

Area of Science:

  • Molecular Biology
  • Oncology
  • Gene Regulation

Background:

  • Lung cancer (LC) is a leading cause of cancer mortality.
  • MicroRNAs play crucial roles in cancer development.
  • The specific role of microRNA-374b in LC requires further elucidation.

Purpose of the Study:

  • To investigate the role of microRNA-374b in lung cancer development.
  • To determine if microRNA-374b targets PTEN (gene of phosphate and tensin homolog deleted on chromosome ten).
  • To explore the involvement of the PI3K/Akt pathway in microRNA-374b-mediated lung cancer progression.

Main Methods:

  • Quantitative Real Time-Polymerase Chain Reaction (qRT-PCR) to measure microRNA-374b and PTEN expression.
  • Cell culture and transfection with microRNA-374b inhibitors in LC cell lines (A549, H358).
  • Wound healing and CCK-8 assays to assess cell migration and proliferation.
  • Dual-luciferase reporter gene assay to confirm microRNA-374b binding to PTEN.
  • Western blot to analyze protein expression in the PTEN/PI3K/Akt pathway.

Main Results:

  • MicroRNA-374b expression was significantly higher in LC tissues and cell lines compared to normal tissues.
  • PTEN expression was inversely correlated with microRNA-374b levels in LC.
  • Downregulation of microRNA-374b inhibited migration and proliferation of LC cells.
  • MicroRNA-374b directly targets PTEN, inhibiting its expression and activating the PI3K/Akt pathway.
  • PTEN knockdown promoted LC cell migration and proliferation, effects attenuated by microRNA-374b inhibition.

Conclusions:

  • MicroRNA-374b promotes lung cancer development.
  • This promotion occurs via the downregulation of PTEN expression.
  • Activation of the PI3K/Akt pathway is a key mechanism in microRNA-374b-driven lung cancer progression.

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