Evidence for an interaction between canine synovial cell proteoglycans and link proteins

Rose S. Fife, Stephen L. Myers

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

Link proteins are glycoproteins which stabilize aggregates of proteoglycans and hyaluronic acid in cartilage. We recently identified link proteins in canine synovial cell cultures. We now find that link proteins and proteoglycans extracted from these cells under dissociative conditions sediment in the high-buoyant-density fractions of an associative cesium chloride density gradient, suggesting that link proteins interact with high-bouyant-density proteoglycans. In gradients containing [35S]sulfate-labeled synovial cell extracts, 76% of the labeled sulfate and 54% of the uronic acid is found in the high-buoyant-density fractions. Under associative conditions, Sepharose 2B elution profiles of the crude synovial cell extract, synovial cell high-buoyant-density fractions, and culture medium indicate that synovial cell proteoglycans are present in monomeric form, rather than in aggregates. Synovial cell link proteins co-elute with the [35S]sulfate-labeled material under the same conditions. These proteoglycans do not interact in vitro with exogenous hyaluronic acid. Dermatan sulfate, chondroitin sulfate and heparan sulfate are the major cell-associated sulfated glycosaminoglycans synthesized by cultured canine synovial cells, while hyaluronic acid is found in the culture medium. Although the proteoglycans synthesized by cultured synovial cells interact with link proteins, these data indicate that they do not interact with hyaluronic acid to form aggregates.

Original languageEnglish (US)
Pages (from-to)238-244
Number of pages7
JournalBBA - General Subjects
Volume843
Issue number3
DOIs
StatePublished - Dec 13 1985

Keywords

  • (Canine synovial cell)
  • Link protein
  • Proteoglycan

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Molecular Biology

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