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MiR-509-3-5p causes aberrant mitosis and anti-proliferative effect by suppression of PLK1 in human lung cancer A549

Xian-Hui Wang1, Yao Lu1, Jing-Jing Liang1

  • 1Department of Biochemistry and Molecular Biology, Beijing Key Laboratory of Protein Posttranslational Modifications and Cell Function, School of Basic Medical Sciences, Peking University Health Science Center, Beijing, 100191, PR China.

Biochemical and Biophysical Research Communications
|August 8, 2016
PubMed

Insights

MicroRNA 509-3-5p suppresses lung cancer growth by targeting PLK1, a key player in DNA damage response. This finding offers potential for combined cancer therapies.

Area of Science:

  • Molecular Biology
  • Genetics
  • Cancer Research

Background:

  • MicroRNAs (miRNAs) regulate gene expression and are involved in DNA damage response (DDR).
  • PLK1 is a known modulator of DNA damage checkpoints.
  • The specific interaction between miR-509-3-5p and PLK1 in DDR remains largely unexplored.

Purpose of the Study:

  • To investigate the role of miR-509-3-5p in the DNA damage response pathway.
  • To elucidate the mechanism by which miR-509-3-5p affects PLK1 expression.
  • To evaluate the potential of miR-509-3-5p as a therapeutic target in human lung cancer.

Main Methods:

  • Overexpression of miR-509-3-5p in human cancer cell lines (A549, HepG2, HCT116p53(-/-)).
  • Target validation using 3'-UTR reporter assays.
  • Cell cycle analysis via flow cytometry.
  • Mitotic spindle morphology assessment using immunofluorescence labeling.
  • Assessment of cell proliferation and chemosensitivity.

Main Results:

  • miR-509-3-5p directly targets the 3'-UTR of PLK1, repressing its expression.
  • Overexpression of miR-509-3-5p in cancer cells led to suppressed PLK1 protein levels.
  • miR-509-3-5p induction in cells exposed to cisplatin (CIS) and adriamycin (ADR) correlated with PLK1 downregulation, indicating its role in CIS/ADR-induced DDR.
  • miR-509-3-5p overexpression caused G2/M phase arrest and aberrant mitosis in A549 cells.
  • miR-509-3-5p significantly inhibited A549 cell proliferation and enhanced sensitivity to CIS and ADR.

Conclusions:

  • miR-509-3-5p acts as a tumor suppressor by targeting PLK1.
  • The miR-509-3-5p/PLK1 axis is a crucial component of the DNA damage response pathway.
  • These findings support the potential development of miR-509-3-5p-based strategies for combined cancer chemotherapy.
Keywords:
Aberrant mitosisAdriamycinCisplatinDNA damage responsePLK1miR-509-3-5p

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