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Related Concept Videos

MicroRNAs01:22

MicroRNAs

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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns (non-coding regions of a gene) or intergenic regions (stretches of DNA present between genes). Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself, forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA...
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miR-340 suppresses glioblastoma multiforme.

Daquan Huang1,2, Shuwei Qiu1, Ruiguang Ge3

  • 1Department of Neurology, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou, China.

Oncotarget
|April 2, 2015
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Summary

MicroRNA-340 (miR-340) is downregulated in glioblastoma multiforme (GBM). Restoring miR-340 inhibits glioma growth, induces cell death, and may serve as a prognostic biomarker and therapeutic target.

Keywords:
ROCK1biomarkerglioblastoma multiformemiR-340

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Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • MicroRNA (miRNA) deregulation is implicated in cancer development.
  • miR-340 is frequently downregulated across various cancer types.
  • The specific role of miR-340 in glioblastoma multiforme (GBM) is not well understood.

Purpose of the Study:

  • To investigate the biological function and clinical significance of miR-340 in glioblastoma.
  • To identify the molecular mechanisms underlying miR-340's effects in glioma.

Main Methods:

  • Analysis of miR-340 expression in glioma cell lines and patient tissues.
  • In vitro functional assays to assess proliferation, cell cycle, apoptosis, motility, autophagy, and differentiation.
  • Western blotting and luciferase reporter assays to identify and validate miR-340 targets.
  • ROCK1 silencing experiments.

Main Results:

  • miR-340 expression was significantly downregulated in glioma tissues and cell lines.
  • Lower miR-340 levels correlated with reduced patient survival.
  • Restoration of miR-340 suppressed glioma cell proliferation, induced cell-cycle arrest and apoptosis, reduced motility, and promoted autophagy and differentiation.
  • miR-340 targeted and suppressed oncogenes including AKT, EZH2, EGFR, BMI1, XIAP, and ROCK1.
  • ROCK1 was identified as a direct functional target, and its silencing mimicked miR-340's anti-tumor effects.

Conclusions:

  • miR-340 functions as a tumor suppressor in glioblastoma.
  • miR-340 plays a critical role in inhibiting glioma cell proliferation, survival, and metastasis.
  • miR-340 represents a potential prognostic biomarker and therapeutic target for GBM.