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• W2051220133 abstract "The synthesis and turnover of metabolically labeled proteoglycans from medium, cell layer, and substratum-associated compartments were characterized in four cell lines of fibroblastic origin, including a fibrosarcoma line, and in the murine melanoma cell type, B16.F10. Substantial differences were apparent between the various cell types with regard to quantities, hydrodynamic sizes, and compartmentalization of labeled product. Such variations were greater between the different cell lines than between separately labeled cultures of the same cell type. Greater than 85% of cell-associated proteoglycans were accessible to glycosaminoglycan-degrading enzymes added to the medium of monolayer cultures, demonstrating their principal location to be external to the cell membrane. Apparent glycosaminoglycan free chains, determined by a lack of change in hydrodynamic size following alkaline elimination, were among the products from each cell line and were similarly found to be in a principally pericellular location. Results from label-chase studies demonstrated apparent independent kinetics for proteoglycans and glycosaminoglycan free chains, with little conclusive evidence for precursor-product relationships. Also, their processing by the cells was different, since the proteoglycans were shed largely unchanged into the medium for the three cell lines evaluated, whereas the free chains were not recoverable from the medium in significant amounts. The latter observation suggests the internalization of cell surface-associated free chains and their depolymerization at an intracellular site. The results, which indicate that the content, cellular disposition, and turnover of proteoglycans are quite variable between the cell lines studied, may reflect fundamental cell type-specific specialization in the metabolism of these complex substances. Furthermore, the data raise the interesting possibility that glycosaminoglycan free chains may have biological functions at the cellular level, independent of proteoglycans." @default.
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• W2051220133 date "1988-05-01" @default.
• W2051220133 modified "2023-09-27" @default.
• W2051220133 title "Evidence for independent metabolism and cell surface localization of cellular proteoglycans and glycosaminoglycan free chains" @default.
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• W2051220133 doi "https://doi.org/10.1002/jcp.1041350206" @default.
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