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Regulation of the chondroitin/dermatan fine structure by transforming growth factor-beta 1 through effects on polymer-modifying enzymes

In English

Författare

Summary, in English

The chondroitin/dermatan sulfate proteoglycans (CS/DSPGs), biglycan, decorin, and versican play several important roles in extracellular matrix influencing matrix organization, cell proliferation, and recruitment. Moreover, they bind and regulate growth factors in the extracellular matrix. We have previously shown that cultured human lung fibroblasts treated with transforming growth factor-beta (TGF-beta) alone or in combination with epidermal growth factor and platelet-derived growth factor, increase the production of these PGs. In this report, we describe that the structure of their galactosaminoglycan side chains is altered, albeit there is no alteration of polysaccharide length. The findings showed that iduronic acid content is reduced by 50% in decorin and biglycan, whereas 4-O-sulfation is increased 2-fold in versican. To unravel the mechanism behind these changes, the activities of chondroitin C-5 epimerase and of O-sulfotransferases in cellular fractions prepared from fibroblasts were quantitated, and transcript levels of the relevant sulfotransferases were measured by real time polymerase chain reaction (RT-PCR). The C-5 epimerase activity was reduced by 25% in TGF-beta 1 treated cells and 50% in fibroblasts treated with the growth factor combination. No change in activity in dermatan 4-O sulfotransferase was observed, and only a minor decrease in dermatan 4-O-sulfotransferase-1 (D4ST-1) mRNA was observed. On the other hand, chondroitin 4-O sulfotransferase activity increased 2-fold upon TGF-beta 1 treatment and 3-fold upon treatment with the growth factor combination. This is in agreement with a 2-fold up-regulation of chondroitin-4-O-sulfotransferase 1 (C4ST-1) mRNA, and no changes in chondroitin-4-O-sulfotransferase 2 (C4ST-2) mRNA. Thus, cellular activity and transcript level correlated well with the changes in the structure of the dermatan/chondroitin sulfate chains.

Avdelning/ar

Publiceringsår

2005

Språk

Engelska

Sidor

1277-1285

Publikation/Tidskrift/Serie

Glycobiology

Volym

15

Issue

12

Dokumenttyp

Artikel i tidskrift

Förlag

Oxford University Press

Ämne

  • Biochemistry and Molecular Biology

Nyckelord

  • glucuronyl c5-epimerase
  • chondroitin
  • sulfotransferase
  • dermatan
  • glycosaminoglycan

Status

Published

Forskningsgrupp

  • Matrix Biology
  • Lung Biology

ISBN/ISSN/Övrigt

  • ISSN: 1460-2423