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. 1986 Aug 15;238(1):209–216. doi: 10.1042/bj2380209

Effect of benzyl beta-D-xyloside on the biosynthesis of chondroitin sulphate proteoglycan in cultured human monocytes.

S O Kolset, J Ehlorsson, L Kjellén, U Lindahl
PMCID: PMC1147117  PMID: 3800933

Abstract

Monocytes isolated from human blood differentiate into macrophage-like cells when maintained in vitro for 3-5 days on plastic or glass culture dishes. In the process the cells display characteristic morphological changes, and in addition, a transition in glycosaminoglycan biosynthesis, from the production of chondroitin 4-sulphate to the formation of a polysaccharide containing 20% 4,6-disulphated disaccharide units [Kolset, Kjellén, Seljelid & Lindahl (1983) Biochem. J. 210, 661-667]. Cells were incubated with inorganic [35S]sulphate on day 1 or day 6 in culture, in the presence or absence of benzyl beta-D-xyloside, and labelled polysaccharide was isolated from the culture medium. In the presence of xyloside, the secretion of proteoglycans (90% galactosaminoglycan) was inhibited in a dose-dependent fashion and replaced by release of single polysaccharide chains, the size of which decreased with increasing dose of xyloside. The single polysaccharide chains produced on day 6 in the presence of 0.5 mM-xyloside showed the same proportion of disulphated disaccharide units as did the corresponding control material. Day-1 polysaccharide contained negligible amounts of this component, irrespective of the presence or absence of xyloside. It is concluded that the regulatory mechanism that induces 'oversulphation' during the differentiation process operates independently of any association between the polysaccharide chains and the core protein. Moreover, cells maintained in the presence of 0.5 mM-xyloside throughout a 6-day culture period showed the same morphological change, indicative of differentiation into macrophage-like cells, as did untreated control cells. The xyloside did not significantly affect the cytotoxicity of the monocytes, or of the differentiated macrophage-like cells, toward tumour cells.

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Selected References

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