Extracellular matrix-bound vascular endothelial growth factor promotes endothelial cell adhesion, migration, and survival through integrin ligation
| Autor: | Helen Hutchings, Nathalie Ortega, Jean Plouët |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Vascular Endothelial Growth Factor A
Integrins Tumstatin Angiogenesis Cell Survival Integrin Endothelial Growth Factors Biochemistry Models Biological Extracellular matrix chemistry.chemical_compound Cell Movement Stress Fibers Genetics Cell Adhesion Humans Molecular Biology Cells Cultured Lymphokines biology Vascular Endothelial Growth Factors Integrin alpha3beta1 Integrin alphaVbeta3 Cell biology Extracellular Matrix Vascular endothelial growth factor Vascular endothelial growth factor B Vascular endothelial growth factor A Vascular endothelial growth factor C chemistry biology.protein Intercellular Signaling Peptides and Proteins Endothelium Vascular Biotechnology |
| Zdroj: | FASEB journal : official publication of the Federation of American Societies for Experimental Biology. 17(11) |
| ISSN: | 1530-6860 |
| Popis: | Vascular endothelial growth factor (VEGF), a major factor mediating endothelial cell survival, migration, and proliferation during angiogenesis, is expressed as five splice variants (121, 145, 165, 189, and 206 aminoacids) encoded by a single gene. Although the three shorter isoforms are mainly diffusible, the two longer ones are sequestered in cell membranes after secretion. However, their potential role as true components of the extracellular matrix has not been investigated. We determined that endothelial cells could adhere and spread on VEGF189 and VEGF165, but not on VEGF121. Adhesion was mediated by the alpha3beta1 and alpha(v)beta3 integrins and other alpha(v) integrins but not by the cognate VEGF receptors. Cells migrated on VEGF165 and VEGF189 and displayed a stellate morphology with numerous lamellopodia and FAK staining but no actin stress fibers. Tumstatin, an antiangiogenic peptide that interacts with the alpha(v)beta3 integrin, could inhibit adhesion on VEGF, and this effect was potentiated by anti-alpha(v)beta3 blocking antibody. Immobilized VEGF almost totally abolished endothelial cell apoptosis through interactions with integrins. The inhibition of alpha(v)beta3 engagement with immobilized VEGF by tumstatin inhibited most of its survival activity. We have thus determined a new VEGF receptor-independent role for immobilized VEGF in supporting cell adhesion and survival through interactions with integrins. |
| Databáze: | OpenAIRE |
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