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The turnover of proteoglycans in the extracellular matrix was studied in fibroblasts cultures derived from patients with mucopolysaccharidosis (MPS) and healthy donors. The cells were labelled with 35S-sulfate and 14C-glucosamine and it was found that in MPS-fibroblasts the rate of extracellular matrix turnover was hardly affected, where as the intracellular turnover was severely inhibited. Similar results were obtained with normal fibroblasts treated with 20 mM ammonia. Autoradiography revealed that MPS fibroblasts have a preferential accumulation of 35S-sulfate labelled material in the nuclear area, indicating that the nucleus may also be affected in MPS pathology. It is suggested that, although lysosomal enzymes are an important factor in intracellular proteoglycan turnover, they do not play a crucial role in the turnover of extracellular matrix proteoglycans.
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