Effects of sized heparin oligosaccharide on the interactions of Chinese hamster ovary cell with thrombospondin

X. I. Sun, Paul Kaesberg, J. Choay, J. Harenberg, W. B. Ershler, D. F. Mosher

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

Binding and degradation of TSP by CHO cells and adhesion of CHO cells to substrate-adsorbed TSP are mediated by cell surface PGs and inhibitable by heparin. In order to learn how these three processes are related, we studied the effects of defined heparin oligosaccharides up to 18-mer produced by nitrous acid digestion. There was a complex correlation among oligosaccharide chain length, affinity of oligosaccharide for TSP in a solid phase binding assay, and potencies of oligosaccharide in inhibition of the three cellular processes. Inhibition of degradation was more sensitive to shorter oligosaccharides than inhibition of binding. For instance, the 10-mer inhibited binding of TSP to cells by 10% and degradation by 70%. Punctate immunofluorescence of cell surface bound TSP was replaced by a diffuse pattern after incubation in the presence of the 10-mer. These results suggest that the clustering of TSP on the cell surface may trigger endocytosis and degradation. Inhibition of binding of TSP to cells, in turn, was more sensitive to midsized oligosaccharides than inhibition of cell adhesion to adsorbed TSP. Inhibition of adhesion correlated with the ability of oligosaccharides to block binding of 125I-heparin to adsorbed TSP.

Original languageEnglish (US)
Pages (from-to)243-251
Number of pages9
JournalSeminars in Thrombosis and Hemostasis
Volume18
Issue number2
StatePublished - 1992
Externally publishedYes

ASJC Scopus subject areas

  • Hematology

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