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J Biol Chem, Vol. 274, Issue 22, 15892-15900, May 28, 1999

Sulfation of Chondroitin Sulfate in Human Articular Cartilage
THE EFFECT OF AGE, TOPOGRAPHICAL POSITION, AND ZONE OF CARTILAGE ON TISSUE COMPOSITION

Michael T. BaylissDagger , David Osborne, Sandra Woodhouse, and Catherine Davidsonparallel

From the Dagger  Royal Veterinary College, Royal College Street, London NW1 OTU,  Lilly Research Centre Ltd., Windlesham, Surrey GU20 6PH, and the parallel  Wellcome/CRC Institute, University of Cambridge, Tennis Court Road, Cambridge CB2 1QR, United Kingdom

The chondroitin ABC lyase digestion products of normal human femoral condyle articular cartilage and of purified aggrecan were analyzed for their mono- and nonsulfated disaccharide composition. Changes in the total tissue chemistry were most pronounced during the period from birth to 20 years of age, when the -[GlcAbeta ,3GalNAc6]- disaccharide content increased from approximately 50% to 85% of the total disaccharide content and there was a concomitant decrease in the content of the 4-sulfated disaccharide. In general, the disaccharide content of the deeper layers of immature cartilage were richer in the 4-sulfated residue than the upper regions of the tissue. As the tissue aged and decreased in thickness, the disaccharide composition became more evenly 6-sulfated. The newly synthesized chondroitin sulfate chains had a similar composition to the endogenous chains and also underwent the same age and zonal changes. The monoclonal antisera 3B3(+) and 2B6(+) were used to immunolocalize the unsaturated 6- and 4-sulfated residues generated at the reducing termini of the chondroitin sulfate chains by digestion with chondroitin ABC lyase, and these analyses indicated that the sulfation pattern at this position did not necessarily reflect the internal disaccharide composition of the chains. In summary, the sulfation pattern of chondroitin sulfate disaccharides from human normal articular cartilage varies with the age of the specimen, the position (topography) on the joint surface, and the zone of cartilage analyzed. Furthermore, these changes in composition are a consequence of both extracellular, post-translational processing of the core protein of aggrecan and changes in the sulfotransferase activity of the chondrocyte.

Copyright © 1999 by The American Society for Biochemistry and Molecular Biology, Inc.
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