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• W1521056506 abstract "The low density lipoprotein (LDL) receptor-related protein, which serves as the cell surface receptor for several proteins including alpha 2-macroglobulin-protease complexes, has been proposed to be a candidate hepatocytic receptor for chylomicron remnants through its recognition of apolipoprotein E. We have studied the effect of two ligands for this receptor, activated alpha 2-macroglobulin and the recently described 39-kDa protein that copurifies with the LDL receptor-related protein (receptor-associated protein), on the uptake and endocytosis of chylomicrons in intact rats and in isolated, perfused rat livers. Both of these ligands were rapidly taken up and endocytosed into the liver of rats. Chylomicrons from normal rats were injected in vivo and chylomicrons from estradiol-treated rats that were enriched in apolipoprotein E were added to liver perfusates. Prior administration of amounts of activated alpha 2-macroglobulin that saturated hepatic uptake mechanisms did not inhibit hepatic uptake or endocytosis of endogenously labeled cholesteryl esters of chylomicron particles in vivo or in perfused livers over a period of 15 min. By contrast, prior administration of saturating amounts of the receptor-associated protein (expressed in bacteria as a fusion protein with glutathione S-transferase) reduced hepatic uptake by about 30% and virtually abolished endocytosis. The receptor-associated protein inhibited hepatic uptake of human LDL in vivo by 70% and endocytosis by 81%. Our results show that receptor-associated protein-sensitive processes predominate in the overall pathways by which chylomicron remnants are endocytosed by rat liver. Furthermore, they show that the receptor-associated protein binds to and inhibits the function of the LDL receptor as well as the LDL receptor-related protein." @default.
• W1521056506 created "2016-06-24" @default.
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• W1521056506 date "1994-05-01" @default.
• W1521056506 modified "2023-10-15" @default.
• W1521056506 title "Effect of the 39-kDa receptor-associated protein on the hepatic uptake and endocytosis of chylomicron remnants and low density lipoproteins in the rat." @default.
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• W1521056506 doi "https://doi.org/10.1016/s0021-9258(17)36824-2" @default.
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