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- W4253124152 abstract "The metabolism of GM2-ganglioside was studied in situ using cultured skin fibroblasts from normal individuals and patients with different forms of GM2-gangliosidosis. [3H]Sphingosine-labeled GM2 was provided in the culture medium to confluent cells in 6-cm petri dishes. After 10 days, the cells were washed free of radioactivity and harvested by trypsinization. The cellular lipids were extracted and analyzed for radioactivity in GM2 and its metabolic products. In fibroblasts from healthy subjects, 50–60% of the total cellular radioactivity was found in the neutral glycosphingolipids, ceramide, sphingomyelin and fatty acids. Degradation of the labeled GM2 progressed rapidly via GM3, ceramide dihexoside and ceramide monohexoside with a build-up of radioactivity mainly in the ceramide pool of the cell. The labeled ceramide is also reutilized for the synthesis of ceramide trihexoside, globoside and sphingomyelin or is converted to fatty acid and incorporated in ester linkages. In contrast, cells from patients with GM2-gangliosidosis representing Tay-Sachs, Sandhoff and AB variant forms of the disease did not metabolize the ingested labeled GM2-like controls. Nearly all of the radioactivity was present in the ganglioside fraction in the lipid extracts from these cells and consisted of unhydrolyzed GM2. High-performance liquid chromatographic analysis of monosialogangliosides from cells grown without added labeled GM2 in the medium indicated accumulation of endogenously synthesized GM2 in cell lines from all patients with GM2 gangliosidosis compared to healthy controls. This approach provides a reliable tool for pre- and post-natal diagnosis of all forms of GM2-gangliosidosis without ambiguity." @default.
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- W4253124152 date "1985-01-01" @default.
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- W4253124152 title "The distribution patterns of glycolipid in primary cultured cells from rat cerebral hemispheres" @default.
- W4253124152 doi "https://doi.org/10.1016/0168-0102(85)90343-8" @default.
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