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. 1986 Sep 1;238(2):465–474. doi: 10.1042/bj2380465

Comparison of small proteoglycans from skin fibroblasts and vascular smooth-muscle cells.

U Rauch, J Glössl, H Kresse
PMCID: PMC1147158  PMID: 3800948

Abstract

Physicochemical and chemical properties of small proteoglycans containing galactosaminoglycan chains from cultured human skin fibroblasts and human smooth-muscle cells were compared to determine the extent of structural similarity. The proteoglycan secreted by smooth-muscle cells was of larger molecular size and of higher buoyant density, due to longer glycosaminoglycan chains, than the secretion product of skin fibroblasts. Additionally, both proteoglycans differed in the ratio of iduronic acid and glucuronic acid residues. On the other hand, degradation of secreted [3H]leucine-labelled proteoglycans with chondroitin ABC lyase followed by SDS/polyacrylamide-gel electrophoresis resulted in the appearance of core protein bands of identical size (Mr 48,000 and 45,000, depending on the number of asparagine-bound oligosaccharides). An Mr value of 40,000 was determined for the core protein of cells pretreated with tunicamycin. An antibody against the core protein from fibroblast secretions was cross-reactive with the core protein from smooth-muscle cells. Core protein accumulating intracellularly after treatment with carbonyl cyanide m-chlorophenylhydrazone exhibited, on reduction and alkylation, an isoelectric point of 7.8 in both cell types. Limited proteolysis by staphylococcal V8 serine proteinase or endoproteinase Lys-C led in both instances to the formation of peptides of identical size. Peptides bearing asparagine-bound oligosaccharides were free of glycosaminoglycan chains. Similar peptide patterns were obtained when 125I-labelled core proteins were digested with either trypsin or chymotrypsin. Thus small proteoglycans from fibroblasts and smooth-muscle cells can be differentiated by their glycosaminoglycan moieties but not by the nature of their core proteins.

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