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Human skin fibroblasts cultured on collagen gels produced two dermatan sulphate species, one, enriched in iduronic acid residues, that bound specifically to the collagenous fibres of the gel, the other, enriched in glucuronic acid, that accumulated in the culture medium. Collagen-binding and collagen-non-binding dermatan sulphates were also produced by cells grown on plastic surfaces, but in these cultures each constituent was released into the growth medium. Net synthesis of dermatan sulphate was 3-fold higher in cells maintained on collagen gels. In contrast, heparan sulphate synthesis was not influenced by the nature of the culture surface. The concentration of heparan sulphate in surface-membrane extracts was similar for cells grown on plastic and on collagen gels, but cells cultured on collagen showed a notable increase in the content of surface-membrane dermatan sulphate. The patterns of synthesis and distribution of sulphated glycosaminoglycans observed in skin fibroblasts maintained on collagen gels may reflect differentiated cellular functions.

Specific association of iduronic acid-rich dermatan sulphate with the extracellular matrix of human skin fibroblasts cultured on collagen gels