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- W1970051116 abstract "Tritium-labeled neoglycolipids consisting of the oligosaccharide of ganglioside GM1 attached to cholesterol (GM1OSNH-X-CHOL), phosphatidylethanolamine (GM1OS-PE) and stearylamine (GM1OSNHC18) were synthesized and their uptake and metabolism by GM1-deficient rat glioma C6 cells were determined. When the neoglycolipids were added to serum-free culture medium, all three were rapidly taken up by the cells and initially inserted into the plasma membrane based on their resistance to trypsin and their ability to bind cholera toxin. With time, the neoglycolipids underwent internalization as the ratio of cell-associated radioactivity to cell surface toxin binding increased; this process was slow for GM1OSNH-X-CHOL and GM1OS-PE and rapid for GM1OSNHC18. Analysis of lipids extracted from the cells indicated that the neoglycolipids also underwent metabolism to GD1aOS-based analogues. In addition, GM1OSNH-X-CHOL and GM1OSNHC18 were degraded to their GM2OS-based analogues, whereas GM2OS-PE was not detected. In contrast, large amounts of 3H were recovered in the medium from cells treated with GM1OS-PE and the label was associated with material that behaved neither as an oligosaccharide or a neoglycolipid. In the presence of monensin or chloroquine, metabolism of the three neoglycolipids was inhibited. Thus, GM1OS-based neoglycolipids were taken up by the cells, internalized and sorted both to the Golgi apparatus (sialylated to GD1aOS-based analogues) and to lysosomes (hydrolyzed to GM2OS-based analogues). The rate and extent of these processes, however, were strongly influenced by the nature of lipid moiety." @default.
- W1970051116 created "2016-06-24" @default.
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- W1970051116 date "1991-05-01" @default.
- W1970051116 modified "2023-09-27" @default.
- W1970051116 title "Metabolism of cholesterol, phosphatidylethanolamine and stearylamine analogues of GM1 ganglioside by rat glioma C6 cells" @default.
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- W1970051116 doi "https://doi.org/10.1016/0005-2760(91)90036-h" @default.
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