Related Experiment Videos
Angiogenesis modulates the tumour immune response.
A W Griffioen1, S C Tromp, H F Hillen
1Department of Internal Medicine, University Hospital Maastricht, The Netherlands. a.griffioen@intmed.unimaas.nl
International Journal of Experimental Pathology
|May 13, 1999
Summary
Tumors evade immune detection by reducing endothelial adhesion molecules, a process reversed by angiogenesis inhibitors. This discovery offers new therapeutic strategies for cancer treatment.
Area of Science:
- Oncology
- Immunology
- Cell Biology
Background:
- Tumor growth and metastasis rely on angiogenesis.
- Tumors suppress immune infiltration by downregulating endothelial adhesion molecules.
- Angiogenic factors mediate this downregulation on endothelial cells.
Purpose of the Study:
- To investigate the role of angiogenesis in endothelial adhesion molecule expression.
- To explore mechanisms by which tumors evade immune surveillance.
- To identify potential therapeutic targets for counteracting tumor-induced endothelial cell anergy.
Main Methods:
- Comparative analysis of adhesion molecule expression in tumor vs. normal endothelial cells.
- In vitro culture of endothelial cells with angiogenic factors (bFGF, VEGF).
- Assessment of endothelial cell responsiveness to TNF-alpha under angiogenic conditions.
Main Results:
- Freshly isolated tumor endothelial cells show decreased ICAM-1 and ICAM-2 expression compared to normal cells.
- Angiogenesis stimulators (bFGF, VEGF) downregulate adhesion molecules on normal endothelial cells.
- Endothelial cells exposed to angiogenic factors become less responsive to TNF-alpha-induced adhesion molecule upregulation.
- Angiogenesis inhibitors were shown to counteract this detrimental endothelial cell anergy.
Conclusions:
- Tumor-induced downregulation of endothelial adhesion molecules facilitates immune evasion.
- Angiogenic factors play a critical role in suppressing endothelial cell adhesion molecule expression.
- Inhibitors of angiogenesis hold promise for restoring endothelial cell responsiveness and enhancing anti-tumor immunity.