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In Vivo Inhibition of MicroRNA to Decrease Tumor Growth in Mice
07:02

In Vivo Inhibition of MicroRNA to Decrease Tumor Growth in Mice

Published on: August 23, 2019

MiR-128 inhibits tumor growth and angiogenesis by targeting p70S6K1

Zhu-mei Shi1, Jing Wang, Zhiping Yan

  • 1Department of Neurosurgery, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China.

Plos One
|March 24, 2012
PubMed

Insights

MicroRNAs (miRNAs) regulate genes. This study found decreased miR-128 in glioma, targeting p70S6K1 to inhibit tumor growth and angiogenesis, suggesting miR-128 as a potential therapeutic target.

Area of Science:

  • Molecular Biology
  • Oncology
  • Biochemistry

Background:

  • MicroRNAs (miRNAs) are key regulators of gene expression, impacting various cellular processes.
  • Dysregulation of miRNAs is implicated in the development and progression of various cancers, including glioma.
  • Understanding miRNA function is crucial for developing novel cancer therapies.

Purpose of the Study:

  • To investigate the role of miR-128 in glioma.
  • To identify direct targets of miR-128 in glioma cells.
  • To elucidate the mechanism by which miR-128 affects glioma progression, focusing on tumor growth and angiogenesis.

Main Methods:

  • Quantitative real-time PCR to measure miR-128 expression levels in glioma tissues.
  • Western blotting and luciferase reporter assays to validate p70S6K1 as a direct target of miR-128.
  • Cell proliferation assays, in vivo tumor growth models, and assessment of angiogenesis markers (HIF-1, VEGF) following miR-128 or p70S6K1 manipulation.

Main Results:

  • miR-128 expression was significantly decreased in glioma tissues compared to normal brain tissues.
  • p70S6K1 was identified as a direct target of miR-128, with miR-128 overexpression leading to reduced p70S6K1 levels.
  • Overexpression of miR-128 suppressed glioma cell proliferation, tumor growth, and angiogenesis by inhibiting p70S6K1 and its downstream signaling pathways (HIF-1, VEGF).
  • Forced expression of p70S6K1 partially rescued the inhibitory effects of miR-128.

Conclusions:

  • The miR-128/p70S6K1 axis plays a critical role in regulating glioma tumor growth and angiogenesis.
  • miR-128 functions as a tumor suppressor in glioma by targeting p70S6K1.
  • miR-128 represents a promising therapeutic target for glioma treatment.

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