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miR-340-FHL2 axis inhibits cell growth and metastasis in ovarian cancer

Zheng Huang1, Qiuxia Li1, Kaili Luo1

  • 1Institute of Genomic Medicine, Wenzhou Medical University, 325000, Wenzhou, Zhejiang, P. R. China.

Cell Death & Disease
|May 10, 2019
PubMed

Insights

MicroRNA-340 (miR-340) is downregulated in ovarian cancer (OC), inhibiting tumor growth and metastasis by targeting FHL2. Restoring miR-340 may offer a new therapeutic strategy for OC patients.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • MicroRNAs (miRNAs) play a role in cancer development.
  • The specific function of miR-340 in ovarian cancer (OC) is not well understood.

Purpose of the Study:

  • To investigate the role of miR-340 in ovarian cancer.
  • To identify miR-340's molecular targets and pathways involved in OC progression.

Main Methods:

  • Compared miR-340 expression in OC tissues and normal samples.
  • Treated OC cells with epigenetic modifiers (5-Aza-dC, TSA).
  • Overexpressed miR-340 and silenced FHL2 in OC cells.
  • Analyzed Wnt/β-catenin pathway and downstream targets.
  • Performed pan-cancer analysis on patient tissues.

Main Results:

  • miR-340 expression was significantly downregulated in OC tissues.
  • 5-Aza-dC and TSA treatments upregulated miR-340 expression.
  • miR-340 overexpression inhibited OC cell growth and metastasis in vitro and in vivo.
  • FHL2 was identified as a direct target of miR-340; silencing FHL2 mimicked miR-340's effects.
  • miR-340 suppressed the Wnt/β-catenin pathway by targeting FHL2, affecting cell cycle and EMT.
  • Low miR-340 and high FHL2 levels correlated with poor patient outcomes.

Conclusions:

  • The miR-340-FHL2 axis regulates Wnt/β-catenin signaling and is implicated in ovarian cancer tumorigenesis.
  • miR-340 acts as a tumor suppressor in OC.
  • Targeting the miR-340-FHL2 pathway presents a potential therapeutic strategy for ovarian cancer.

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