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• W1990717706 abstract "We have investigated the association of apolipoprotein E (apoE) with the HepG2 cell surface (i.e. plasma membrane and extracellular matrix) using domain specific monoclonal antibodies against apoE. Growth in beta-D-xyloside decreased the incorporation of 35S into glycosaminoglycans by 31% and cell surface apoE by 45% with a concomitant increase in apoE secretion (4.3-fold), underlining the importance of glycosaminoglycan association of apoE. Heparinase (3-10 U/mL) or heparin (1 mg/mL) decreased apoE by 25 and 30.5%, respectively, which suggests that some apoE is associated with cell surface heparan sulfate proteoglycans. Chondroitinase ABC (1.5 U/mL) reduced cell surface apoE by 40%, indicating that a major pool of apoE is associated with chondroitin sulfate proteoglycans. Further enzymatic and displacement analysis suggested that cell surface apoE associates specifically with GAGs containing chondroitin-4-sulfates. 3H1, a monoclonal antibody that recognizes an epitope within the lipid-binding C-terminal domain of apoE, decreased binding of apoE to chondroitin sulfate proteoglycans in solid-phase assays by 77% and to heparan sulfate proteoglycans by 46%, suggesting that this region is of increased importance for binding to chondroitin sulfate proteoglycans. Previous studies with 3H1 demonstrated that apoE of the extracellular matrix is lipid-poor (Burgess, J. W., Gould, D. R., and Marcel, Y. L. (1998) J. Biol. Chem. 273, 5645-5654), but we show here that apoE on the remaining cell surface is lipid-associated. In summary, lipidated apoE associates with the HepG2 plasma membrane through interactions with chondroitin-4-sulfate containing GAGs and, to a lesser extent, HSPG." @default.
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• W1990717706 date "1998-12-19" @default.
• W1990717706 modified "2023-10-16" @default.
• W1990717706 title "ApoE of the HepG2 Cell Surface Includes a Major Pool Associated with Chondroitin Sulfate Proteoglycans" @default.
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• W1990717706 doi "https://doi.org/10.1021/bi9819778" @default.
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