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MiR-421 inhibits the malignant phenotype in glioma by directly targeting MEF2D

Liang Liu1, Sitong Cui1, Rui Zhang2

  • 1Department of Neurosurgery, Nanjing First Hospital, Nanjing Medical UniversityNanjing 210006, China.

American Journal of Cancer Research
|May 5, 2017
PubMed

Insights

MicroRNA-421 (miRNA-421) is downregulated in high-grade gliomas. Its restoration inhibits glioma progression and enhances radiosensitivity by targeting myocyte enhancer factor 2D (MEF2D).

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • MicroRNA-421 (miRNA-421) dysregulation is implicated in various human cancers.
  • The specific role and molecular mechanisms of miRNA-421 in glioma pathogenesis remain largely uncharacterized.

Purpose of the Study:

  • To investigate the biological functions and molecular mechanisms of miRNA-421 in glioma.
  • To determine the potential of miRNA-421 as a therapeutic target in glioma treatment.

Main Methods:

  • Analysis of miRNA-421 expression in glioma datasets (CGGA) and patient tissues.
  • Functional assays in glioma cell lines to assess the impact of miRNA-421 on glucose metabolism, invasion, angiogenesis, and radiosensitivity.
  • Identification and validation of miRNA-421 targets using bioinformatics and experimental approaches.
  • In vivo studies using a xenograft model to evaluate the effect of miRNA-421 on tumorigenicity.

Main Results:

  • MiR-421 expression was significantly lower in high-grade gliomas (HGG) compared to low-grade gliomas (LGG).
  • Exogenous expression of miR-421 suppressed glioma cell glucose metabolism, invasion, and angiogenesis, while enhancing radiosensitivity.
  • Myocyte enhancer factor 2D (MEF2D) was identified as a direct target of miR-421.
  • Downregulation of MEF2D mimicked the tumor-suppressive effects of miR-421, and MEF2D overexpression partially reversed these effects.
  • Overexpression of miR-421 suppressed tumor growth in a xenograft model.

Conclusions:

  • MiR-421 acts as a tumor suppressor in gliomas.
  • MiR-421 exerts its tumor-suppressive functions, including inhibition of glucose metabolism, invasion, and angiogenesis, and enhancement of radiosensitivity, partly through the downregulation of MEF2D.
  • MiR-421 represents a potential therapeutic agent for glioma treatment.
Keywords:
MEF2Dangiogenesisglucose metabolismmiR-421radiosensitivity

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