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Preparation Of Neovascular Tissues from Human Glioma Tissues for Quantitative Proteomics Analysis of Tumor Angiogenesis
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Decrease of endogenous vascular endothelial growth factor may not affect glioma cell proliferation and invasion.

Xin Hong1, Feng Jiang, Steven N Kalkanis

  • 1Department of Neurosurgery, Henry Ford Health Science Center, Detroit, MI 48202, USA.

Journal of Experimental Therapeutics & Oncology
|June 8, 2007
PubMed
Summary

Vascular endothelial growth factor (VEGF) is produced by glioma cells, but reducing its expression did not impact cell proliferation or invasion. This suggests VEGF may not be essential for glioma growth and spread.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Glioma cells, particularly glioblastoma, produce abundant vascular endothelial growth factor (VEGF).
  • VEGF typically promotes tumor angiogenesis via paracrine signaling on endothelial cells.
  • Recent findings suggest potential autocrine roles for VEGF in tumor cells expressing its receptors.

Purpose of the Study:

  • To investigate the autocrine function of VEGF in human glioma cell lines.
  • To determine if VEGF signaling influences glioma cell proliferation and invasion.

Main Methods:

  • Assessed VEGF and VEGF receptor (VEGFR) expression in U251n, U87, and A172 glioma cell lines.
  • Utilized phosphorothioate oligodeoxynucleotide (PS-ODN) and VEGF RNA interference (RNAi) to downregulate VEGF expression.
  • Measured cell proliferation using MTT and CyQuant NF assays.
  • Evaluated cell invasion with matrigel assays and analyzed matrix metalloproteinases (MMPs) via zymography.

Main Results:

  • Glioma cell lines expressed VEGF and multiple VEGFRs, including VEGFR-1, VEGFR-2, Neuropilin-1, and Neuropilin-2.
  • VEGF RNAi and antibody neutralization did not significantly affect glioma cell proliferation.
  • PS-ODN transfection caused a non-specific decrease in cell proliferation.
  • VEGF RNAi did not alter glioma cell invasion or the expression of MMP-2 and MMP-9.

Conclusions:

  • Endogenous VEGF expression in glioma cells does not appear to be critical for cell proliferation.
  • Reducing VEGF levels does not influence glioma cell invasion.
  • The autocrine signaling of VEGF may not play a significant role in the progression of these glioma cell lines.