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Journal of Cell Science, Vol 112, Issue 4 569-578, Copyright © 1999 by Company of Biologists
JOURNAL ARTICLES |
G Collo and MS Pepper
Department of Morphology, University Medical Center, 1211 Geneva 4, Switzerland. michael.pepper@medecine.unige.ch
Alterations in endothelial cell-extracellular matrix interactions are central to the process of angiogenesis. We have investigated the effect of wound-induced two-dimensional migration, basic fibroblast growth factor (bFGF), transforming growth factor-beta1 (TGF-beta1) and leukemia inhibitory factor (LIF) on expression of the alpha5beta1 integrin in endothelial cells. In multiple-wounded monolayers of bovine microvascular endothelial (BME) cells, an increase in mRNA and total protein for both alpha5 and beta1 subunits was observed, and this could be correlated with a reduction in cell density but not proliferation, both of which are induced following wounding. Although as previously reported, the alpha5 subunit was increased when cells were exposed to TGF-beta1 alone, co-addition of bFGF and TGF-beta1 resulted in a striking synergistic induction of alpha5, with no significant changes in the expression of beta1. In contrast, the alpha5 subunit was decreased by LIF in bovine aortic endothelial but not in BME cells. These findings suggest that quantitative alterations in alpha5 and beta1 integrin subunit expression modulate the adhesive and migratory properties of endothelial cells during angiogenesis.
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