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• W171024714 endingPage "2325" @default.
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• W171024714 abstract "The receptor-mediated uptake of rat hypercholesterolemic very low density lipoproteins (beta VLDL) and rat chylomicron remnants was studied in monolayer cultures of the J774 and P388D1 macrophage cell lines and in primary cultures of mouse peritoneal macrophages. Uptake of 125I-beta VLDL and 125I-chylomicron remnants was reduced 80-90% in the presence of high concentrations of unlabeled human low density lipoproteins (LDL). Human acetyl-LDL did not significantly compete at any concentration tested. Uptake of 125I-beta VLDL and 125I-chylomicron remnants was also competitively inhibited by specific polyclonal antibodies directed against the estrogen-induced LDL receptor of rat liver. Incubation in the presence of anti-LDL receptor IgG, but not nonimmune IgG, reduced specific uptake greater than 80%. Anti-LDL receptor IgG, 125I-beta VLDL, and 125I-chylomicron remnants bound to two protein components of apparent molecular weights 125,000 and 111,000 on nitrocellulose blots of detergent-solubilized macrophage membranes. Between 70-90% of 125I-lipoprotein binding was confined to the 125,000-Da peptide. Binding of 125I-beta VLDL and 125I-chylomicron remnants to these proteins was competitively inhibited by anti-LDL receptor antibodies. Comparison of anti-LDL receptor IgG immunoblot profiles of detergent-solubilized membranes from mouse macrophages, fibroblasts, and liver, and normal and estrogen-induced rat liver demonstrated that the immunoreactive LDL receptor of mouse cells is of a lower molecular weight than that of rat liver. Incubation of J774 cells with 1.0 micrograms of 25-hydroxycholesterol/ml plus 20 micrograms of cholesterol/ml for 48 h decreased 125I-beta VLDL uptake and immuno- and ligand blotting to the 125,000- and 111,000-Da peptides by only 25%. Taken together, these data demonstrate that uptake of beta VLDL and chylomicron remnants by macrophages is mediated by an LDL receptor that is immunologically related to the LDL receptor of rat liver." @default.
• W171024714 created "2016-06-24" @default.
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• W171024714 date "1987-02-01" @default.
• W171024714 modified "2023-09-30" @default.
• W171024714 title "Transport of beta-very low density lipoproteins and chylomicron remnants by macrophages is mediated by the low density lipoprotein receptor pathway." @default.
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• W171024714 doi "https://doi.org/10.1016/s0021-9258(18)61656-4" @default.
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