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• W1502667717 abstract "In avian-cultured adipocytes 76% of the newly synthesized lipoprotein lipase is degraded before release into the medium (Cupp, M., Bensadoun, A., and Melford, K. (1987) J. Biol. Chem. 262, 6383-6388). The same group (Cisar, L. A., Hoogewerf, A. J., Cupp, M., Rapport, C. A., and Bensadoun, A. (1989) J. Biol. Chem. 264, 1767-1774) has proposed that the interaction of lipoprotein lipase with a class of cell surface heparan sulfate proteoglycans is necessary for degradation to occur. To test further this hypothesis, the binding capacity of the plasma membrane for the lipase was decreased by inhibiting the sulfation of glycosaminoglycans with sodium chlorate, an inhibitor of sulfate adenyltransferase. Chlorate decreased sulfate incorporation into trypsin-releasable heparan sulfate proteoglycans to 20% of control levels. The amount of uronic acid in the trypsin-releasable heparan sulfate proteoglycans remained constant. Therefore, chlorate decreased sulfation density on heparan sulfate chains by approximately 5-fold. In the same fractions, chlorate increased the median heparan sulfate Mr measured on Sephacryl S-300. Chlorate decreased the maximum binding of 125I-lipoprotein lipase to adipocytes by 4-fold, but no significant effects on the affinity constants were observed. Chlorate increased lipoprotein lipase secretion in a dose-dependent relationship up to 30 mM. Utilizing a pulse-chase protocol, it was shown that lipase synthesis in control and chlorate-treated cells was not significantly different and that the increased secretion could be accounted for by a decreased lipoprotein lipase degradation rate. In control cells 77 +/- 11% of the synthesized enzyme was degraded whereas in chlorate-treated cells degradation was reduced to 42 +/- 9% of the synthesized amount. The present study shows that decreased sulfation of heparan sulfate proteoglycans decreases the maximum binding of the lipase for the adipocyte cell surface. Consistent with the model that binding of lipoprotein lipase to cell surface heparan sulfate is required for lipase degradation, degradation is reduced in chlorate-treated cultures. In this report it is also shown that chlorate inhibits lipoprotein lipase sulfation and that desulfation of the enzyme has no effect on its catalytic efficiency or on its binding to cultured adipocytes." @default.
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• W1502667717 date "1991-09-01" @default.
• W1502667717 modified "2023-10-15" @default.
• W1502667717 title "Effect of chlorate on the sulfation of lipoprotein lipase and heparan sulfate proteoglycans. Sulfation of heparan sulfate proteoglycans affects lipoprotein lipase degradation." @default.
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• W1502667717 doi "https://doi.org/10.1016/s0021-9258(18)55338-2" @default.
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