International Immunology, Vol. 12, No. 5, 671-676,
May 2000
© 2000 Japanese Society for Immunology
Tumor angiogenesis factors reduce leukocyte adhesion in vivo
1 Departments of Physiology and
2 Biophysics, Cardiovascular Research Institute Maastricht, Maastricht University, PO Box 616, 6200 MD Maastricht, The Netherlands
3 Department of Internal Medicine, Tumor Angiogenesis Laboratory, University Hospital Maastricht, PO Box 5800, 6202 AZ Maastricht, The Netherlands
4 Laboratory for Physiology, Institute for Cardiovascular Research, Free University, 1081 BT Amsterdam, The Netherlands
Correspondence to: A. W. Griffioen
Leukocyte–endothelium interactions are diminished in tumors. It is reported here that, in a tumor-free in vivo model, angiogenic factors can down-regulate leukocyte adhesion to endothelium. Slow releasing pellets were loaded with either basic fibroblast growth factor (bFGF), vascular endothelial cell growth factor (VEGF) or vehicle alone and were placed in the scrotum of mice. After 3 days, a single intrascrotal injection of 1 µg/kg IL-1ß was given 4 h before vessels of the cremaster muscle were investigated for leukocyte rolling and adhesion by means of intravital microscopy. Exposure of normal tissue to either bFGF or VEGF resulted in markedly decreased levels of cytokine-induced leukocyte adhesion. Suppression of leukocyte rolling was not observed. Instead a moderate enhancement of rolling by VEGF was found. The observed differences could not be explained by differences in fluid dynamic parameters or systemic leukocyte counts. In conclusion, evidence is presented that, in vivo, angiogenic factors significantly reduce leukocyte adhesion, the final step preceding leukocyte infiltration. This observation may explain why tumors escape from immune surveillance.
Keywords: adhesion, angiogenesis, leukocyte
Transmitting editor: M.Feldmann
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