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• W2000520946 abstract "The metabolism of galactosylceramide and lactosylceramide in cultured fibroblasts was studied using the lipid-loading test. These compounds were incorporated into the fibroblasts yet only small amounts of the incorporated lipids were hydrolyzed unless additional phospholipid was mixed with the glycolipid before loading. Among phospholipids, phosphatidylserine was the most effective for incorporation and hydrolysis of the glycolipids, while phosphatidylcholine inhibited the incorporation of the glycolipids. Using filtration techniques, light scattering analyses and subcellular fractionation, the particle size of glycolipid in the culture medium was found to be critically important for the incorporation of the lipids into the cells and their transportation to the lysosomes. The particle sizes of the glycolipids were decreased by mixing with phosphatidylserine. Furthermore, the negative charge in phosphatidylserine may be necessary for the glycolipid transportation into the lysosomes. In fibroblasts from patients with globoid cell leukodystrophy, 40–50% of galactosylceramide was hydrolyzed on the 4th day of culture, a time when the control fibroblasts had hydrolyzed it about 80%. This finding is in contrast with observations made on fibroblasts with other sphingolipidoses which showed near-zero degradation in corresponding substrate-loading tests. In fibroblasts from patients with either globoid cell leukodystrophy or GM1-gangliosidosis, hydrolysis of lactosylceramide was fairly normal yet somewhat lower than control values on any day of culture, thereby indicating that, in the loading tests, lactosylceramide seems to be hydrolyzed with similar levels of enzyme activities by two distinct β-galactosidases, galactosylceramidase and GM1-ganglioside βalactosidase." @default.
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• W2000520946 date "1985-07-01" @default.
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• W2000520946 title "Galactosylceramide- and lactosylceramide-loading studies in cultured fibroblasts from normal individuals and patients with globoid cell leukodystrophy (Krabbe's disease) and GM1-gangliosidosis" @default.
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• W2000520946 doi "https://doi.org/10.1016/0005-2760(85)90115-8" @default.
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