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MiR-497 Suppresses YAP1 and Inhibits Tumor Growth in Non-Small Cell Lung Cancer

Chongbiao Huang1, Ruijue Ma, Jie Yue

  • 1Senior Ward, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for Cancer, Key Laboratory of Cancer Prevention and Therapy, Tianjin, China.

Cellular Physiology and Biochemistry : International Journal of Experimental Cellular Physiology, Biochemistry, and Pharmacology
|August 29, 2015
PubMed
Abstract

Insights

MicroRNA-497 (miR-497) is significantly decreased in non-small cell lung cancer (NSCLC) and inhibits tumor cell proliferation by targeting YAP1. Lower miR-497 levels correlate with advanced NSCLC and reduced patient survival, suggesting miR-497 as a potential therapeutic target.

Area of Science:

  • Molecular Biology
  • Oncology
  • Gene Regulation

Background:

  • Non-small cell lung cancer (NSCLC) is a major cause of cancer-related mortality.
  • The role of microRNAs (miRNAs) in NSCLC pathogenesis is an area of active research.
  • miR-497's specific function and clinical relevance in NSCLC remain to be fully elucidated.

Purpose of the Study:

  • To investigate the expression levels of miR-497 in NSCLC.
  • To determine the clinical significance of miR-497 in NSCLC patients.
  • To elucidate the cellular effects and molecular targets of miR-497 in NSCLC.

Main Methods:

  • Quantitative real-time PCR (qRT-PCR) to measure miR-497 expression in NSCLC tissues and cells.
  • Transfection of NSCLC cells with miR-497 mimics or siRNA to modulate its expression.
  • Luciferase, colony formation, and BrdU incorporation assays to identify miR-497 targets and assess its role in cell proliferation.
  • Correlation analysis of miR-497 levels with clinical parameters (pT stage, overall survival) in 51 NSCLC patients.

Main Results:

  • miR-497 transcript levels were significantly decreased in 83.3% of NSCLC tissues analyzed.
  • Low miR-497 expression correlated with advanced pT stage and reduced overall survival in NSCLC patients (p = 0.022).
  • Overexpression of miR-497 inhibited NSCLC cell proliferation, while its down-regulation promoted growth; YAP1 was identified as a target that partially mediated miR-497's effects.

Conclusions:

  • miR-497 functions as a tumor suppressor in NSCLC by inhibiting cell proliferation, primarily through targeting YAP1.
  • The findings highlight miR-497 as a potential biomarker for NSCLC progression.
  • miR-497 represents a promising therapeutic target for NSCLC treatment.

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