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- W2064959298 abstract "We have investigated the initial distribution of mannose-specific binding sites in rat liver as well as the uptake and transcytosis pathways of ligands for this receptor in in situ and in vivo experiments. As ligands we used mannan adsorbed onto colloidal gold particles of sizes 5, 17, and 35 nm (Man-Au5, Man-Au17, or Man-Au35). The in situ binding pattern of Man-Au5 in the prefixed liver is identical to the one described earlier for galactose-exposing ligands in the same organ. With the exception of the binding by hepatocytes, where only scarce binding of Man-Au5 was observed, ligands were found adhering in a preclustered pattern all over the cell surface of liver macrophages and binding in aggregates over the coated pits of endothelial cells. In double-labeling experiments different particle sizes were used for glycoproteins with terminal mannosyl or galactosyl residues. This simultaneous localization of the two binding activities revealed that on endothelial cells the two activities are always found to be present in the same coated pit. On liver macrophages the clustered binding occurred at different membrane areas. Uptake and transcytosis of Man-Au5, 17, 35 were studied after their injection into the tail vein. Three and fifteen minutes after injection most of the Man-Au5 and all of Man-Au17 or Man-Au35 was found in sinusoidal liver cells, i.e., macrophages and endothelial cells. One hour after injection, endocytosed ligand is redistributed from large—presumably lysosomal—vacuoles to small noncoated vesicles that are localized predominantly near the space of Dissé. Between 1 and 40 h after injection, ligands of all sizes are transcytosed and found in the hepatocytes. No ligand accumulation is observed in hepatocytes as an indirect indication for secretion into bile. With this investigation we give evidence for transcytotic activity not only of liver endothelium but also of the resident liver macrophages." @default.
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- W2064959298 date "1988-05-01" @default.
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- W2064959298 title "Binding, uptake, and transcytosis of ligands for mannose-specific receptors in rat liver: An electron microscopic study" @default.
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- W2064959298 doi "https://doi.org/10.1016/0014-4827(88)90118-8" @default.
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