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Ganglioside GD1a enhances VEGF-induced endothelial cell proliferation and migration
Z Lang1, M Guerrera, R Li
1Glycobiology Program, George Washington University School of Medicine, Washington, DC, USA.
Biochemical and Biophysical Research Communications
|May 16, 2001
Summary
Tumor cells release gangliosides that enhance blood vessel formation. This study shows ganglioside G(D1a) boosts endothelial cell proliferation and migration in response to vascular endothelial growth factor (VEGF), promoting tumor angiogenesis.
Area of Science:
- Molecular Biology
- Cancer Research
- Cell Biology
Background:
- Tumor progression relies on angiogenesis, the formation of new blood vessels from existing ones.
- Vascular endothelial growth factor (VEGF) is a key soluble factor driving angiogenesis.
- Tumor-associated molecules, including gangliosides, may also influence tumor angiogenesis.
Purpose of the Study:
- To investigate the effect of the ganglioside G(D1a) on endothelial cell responses to VEGF.
- To determine if G(D1a) modulates human umbilical vein endothelial cell (HUVEC) proliferation and migration.
Main Methods:
- HUVECs were preincubated with purified ganglioside G(D1a).
- VEGF-induced HUVEC proliferation was assessed by measuring DNA synthesis.
- VEGF-driven HUVEC migration was evaluated across a VEGF gradient after brief G(D1a) exposure.
Main Results:
- Preincubation with 10 microM G(D1a) resulted in a twofold increase in VEGF-induced HUVEC DNA synthesis.
- A 50% enhancement in HUVEC migration towards a VEGF gradient was observed after a 1-hour G(D1a) pre-exposure.
- Ganglioside G(D1a) significantly potentiates endothelial cell responses to VEGF.
Conclusions:
- Gangliosides shed by tumor cells can promote tumor angiogenesis.
- G(D1a) enhances endothelial cell proliferation and migration in response to VEGF.
- These findings highlight a novel mechanism by which tumor microenvironment components modulate angiogenesis.