Abstract
Parellel toin vitro differentiation of human monocytes into macrophage-like cells, the cells change their synthesis of glycosaminoglycans from chondroitin 4-sulfate to highly sulfated chondroitin sulfate, containing 4,6-disulfatedN-acetylgalactosamine units [Kolsetet al. (1983) Biochem J 210:661–67]. After exposure of monocyte cultures to [35S]sulfate for 24h either from the onset of cultivation, prior to differentiation, or from day 4, after differentiation,35S-macromolecules from medium and cell-layer were isolated and characterized. The cell-layer of day 5 cultures contained both proteoglycans and free polysaccharide chains, while the35S-macromolecules present in the cell-layer of day 1 cultures and in medium of both monocytes and macrophage-like cells were almost exclusively of proteoglycan nature. Proteoglycans produced by macrophage-like cells were of larger size than the monocyte proteoglycans, most likely due to an increased polysaccharide chain length. These proteoglycans, in contrast to the monocyte-derived species, also showed affinity for fibronectin at physiological ionic strength.
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Kolset, S.O., Kjellén, L. Effect ofin vitro differentiation on proteoglycan structure in cultured human monocytes. Glycoconjugate J 3, 287–298 (1986). https://doi.org/10.1007/BF01051778
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DOI: https://doi.org/10.1007/BF01051778