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1. The incorporation of [(35)S]sulphate in vivo into the acid-soluble intermediates extracted from young rat skin showed three sulphated hexosamine-containing components. 2. The rates of synthesis of these components were determined in vivo by measuring the incorporation of radioactivity from [U-(14)C]glucose into their isolated hexosamine moieties. 3. The incorporation of radioactivity from [U-(14)C]glucose into the isolated hexosamine and uronic acid moieties of the acid glycosaminoglycans was also measured. These results, combined with those obtained on the intermediary pathways of hexosamine and uronic acid biosynthesis previously determined in this tissue, indicated that the acid-soluble sulphated hexosamine-containing components were not precursors of the sulphated hexosamine found in the acid glycosaminoglycans. 4. The rates of synthesis of the acid glycosaminoglycan fractions were calculated from the incorporation of radioactivity from [U-(14)C]glucose into the hexosamine moiety. The sulphated components containing principally dermatan sulphate, chondroitin 6-sulphate and in smaller amounts, chondroitin 4-sulphate, heparan sulphate and heparin appeared to be turning over about twice as rapidly as hyaluronic acid and about four times as rapidly as the small keratan sulphate fraction. The relative rates of synthesis of the sulphated glycosaminoglycans were calculated from the incorporation of [(35)S]sulphate and were in agreement with those from (14)C-labelling studies.

Studies on the incorporation of [U-14C]glucose and [35S]sulphate into the acid glycosaminoglycans of neonatal rat skin