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- W1547605412 abstract "We studied the extracellular localization of factor VIII-related antigen (VIIIR: Ag) in cultures of human endothelial cells. The cells deposited both VIIIR: Ag and fibronectin already during their initial adhesion phase and in immunofluorescence microscopy of spread cells extracellular VIIIR: Ag was localized to fibrils coaligning with pericellular fibronectin. When human fibroblasts, which do not synthesize VIIIR: Ag, were cultured in endothelial cell post-culture medium, a fibrillar matrix localization of VIIIR: Ag was seen, comparable to that of endothelial cell cultures. A fibrillar VIIIR: Ag-specific staining was also seen in cell-free pericellular matrices of endothelial cells, produced by deoxycholate treatment. In immunoelectron microscopy, VIIIR: Ag was seen in fibrillar extracellular material between and underneath the cells and in cell-free matrices of of endothelial cells as well. In immunofluorescence microscopy of cell-free matrices, VIIIR: Ag codistributed with both fibronectin and type III procollagen. Digestion of the matrices with purified bacterial collagenase abolished the type III procollagen-specific fluorescence, whereas the fibrillar VIIIR: Ag-specific staining, codistributing with fibronectin, remained unaffected. In electrophoresis of isolated, metabolically labelled endothelial cell matrices, major polypeptides with Mr 220-240; 180; 160 and 45 kD and some minor polypeptides were resolved. In addition, immunoblotting revealed fibronectin, VIIIR: Ag and type III procollagen as components of cell-free matrices of endothelial cells. Direct overlay of iodinated cellular fibronectin on electrophoretically separated polypeptides of cultured endothelial cells, transferred to nitrocellulose, suggested that fibronectin binds directly to VIIIR: Ag. Our results indicate that VIIIR: Ag produced by human endothelial cells is a component of the pericellular matrix and is not bound to collagen but may directly associate with fibronectin." @default.
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- W1547605412 date "1983-12-01" @default.
- W1547605412 modified "2023-10-10" @default.
- W1547605412 title "Factor VIII-related antigen" @default.
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- W1547605412 doi "https://doi.org/10.1016/0014-4827(83)90360-9" @default.
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