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• W2023692836 endingPage "708" @default.
• W2023692836 startingPage "699" @default.
• W2023692836 abstract "Fibroblasts have cell surface sites that mediate assembly of plasma and cellular fibronectin into the extracellular matrix. Cell adhesion to fibronectin can be mediated by the interaction of an integrin (alpha 5 beta 1) with the Arg-Gly-Asp-Ser (RGDS)-containing cell adhesion region of fibronectin. We have attempted to elucidate the role of the alpha 5 beta 1 fibronectin receptor in assembly of fibronectin in matrices. Rat monoclonal antibody mAb 13, which recognizes the integrin beta 1 subunit, completely blocked binding and matrix assembly of 125I-fibronectin as well as binding of the 125I-70-kD amino-terminal fragment of fibronectin (70 kD) to fibroblast cell layers. Fab fragments of the anti-beta 1 antibody were also inhibitory. Antibody mAb 16, which recognizes the integrin alpha 5 subunit, partially blocked binding of 125I-fibronectin and 125I-70-kD. When cell layers were coincubated with fluoresceinated fibronectin and either anti-beta 1 or anti-alpha 5, anti-beta 1 was a more effective inhibitor than anti-alpha 5 of binding of labeled fibronectin to the cell layer. Inhibition of 125I-fibronectin binding by anti-beta 1 IgG occurred within 20 min. Inhibition of 125I-fibronectin binding by anti-beta 1 Fab fragments or IgG could not be overcome with increasing concentrations of fibronectin, suggesting that anti-beta 1 and exogenous fibronectin may not compete for the same binding site. No beta 1-containing integrin bound to immobilized 70 kD. These data indicate that the beta 1 subunit plays an important role in binding and assembly of exogenous fibronectin, perhaps by participation in the organization, regeneration, or cycling of the assembly site rather than by a direct interaction with fibronectin." @default.
• W2023692836 created "2016-06-24" @default.
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• W2023692836 date "1990-08-01" @default.
• W2023692836 modified "2023-10-07" @default.
• W2023692836 title "Inhibition of binding of fibronectin to matrix assembly sites by anti-integrin (alpha 5 beta 1) antibodies." @default.
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• W2023692836 doi "https://doi.org/10.1083/jcb.111.2.699" @default.
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