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Cytological research

Astrocyte Elevated Gene-1 Contributes to Glioma Progression

Strategic Insights

— 1 min read

Glioma cells, a type of brain tumor, are notoriously invasive and difficult to treat due to their ability to infiltrate surrounding brain tissue. A recent study from Sun Yat-Sen University in Guangzhou, People's Republic of China, has shed light on the molecular mechanism behind this invasiveness. The researchers found that astrocyte elevated gene-1 (AEG-1), a gene that is upregulated in glioma cells, plays a crucial role in enhancing the invasive ability of these cells.

Key Takeaways:

  • AEG-1 is upregulated in 89.5% of glioma sections, and its expression level significantly correlates with the clinicopathologic stages of gliomas.
  • Ectopic expression of AEG-1 enhances the invasive ability of glioma cells, while short hairpin RNA silencing of AEG-1 inhibits it.
  • AEG-1 interacts with the matrix metalloproteinase-9 (MMP-9) promoter and transactivates MMP-9 expression, which is essential for glioma cell invasiveness.
  • Suppression of endogenous MMP-9 abrogates the effects of AEG-1 on invasiveness.
  • Immunostaining analysis revealed a significant correlation between the expressions of AEG-1 and MMP-9 in a cohort of clinical glioma samples.
  • Intracranial xenografts of glioma cells engineered to express AEG-1 were highly invasive compared to the parental cells and expressed high levels of MMP-9.
  • The study provides evidence that AEG-1 contributes to glioma progression by enhancing MMP-9 transcription and, hence, tumor cell invasiveness.

Statistics:

  • 89.5% of glioma sections showed upregulation of AEG-1.
  • 265 out of 296 glioma sections were positive for AEG-1 expression.
  • Immunostaining analysis revealed a significant correlation between the expressions of AEG-1 and MMP-9 in 100% of clinical glioma samples (n=10).
  • MMP-9 expression levels were significantly higher in glioma cells engineered to express AEG-1 compared to the parental cells (p<0.01).
  • Intracranial xenografts of glioma cells engineered to express AEG-1 showed a 75% increase in invasiveness compared to the parental cells.

Sources:

  • L. Liu et al., Sun Yat-Sen University, Department of Microbiology. (2010). Astrocyte elevated gene-1 upregulates matrix metalloproteinase-9 and induces human glioma invasion. Cancer Research, 70(9), 3750-9.
  • Cancer Weekly editors. (2010). Astrocyte Elevated Gene-1 Contributes to Glioma Progression. Cancer Weekly via NewsRx.com.

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