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• W2069834090 abstract "Niemann-Pick disease type C (NPC) is a neurovisceral lysosomal lipidosis caused in most cases by mutations in the NPC1 gene that codes for the cholesterol regulating NPC1 protein.Cultured skin fibroblasts from 11 NPC patients aged 0.25 to 34 years at diagnosis with different severity of neurologic and visceral involvement, diagnosed by the cytochemical filipin test for lysosomally stored cholesterol, were analyzed for lipid composition. Cholesterol and other lipids were separated on thin-layer chromatography from fibroblast total lipid extracts, quantified by densitometry and compared with the total cell lipid mass.Cholesterol concentration in the patient cells was 1.5 to 5-fold higher than normal and total lipids up to 2.4-fold normal. Cholesterol and total lipids were particularly high in cells from NPC patients aged less than about 6 years, and for the whole patient series the abundance of fibroblast cholesterol was correlated with the tentatively assessed clinical disease severity. The findings in NPC suggested that NPC1 protein has a role not only in the balance of cholesterol but also the distribution of the total cell lipid mass. Another increase found in the NPC cells was that of a minor lipid fraction, globotriaosylceramide (Gb3, known as a cell signalling glycolipid). Gb3, in the average of its very variable individual concentrations, was about 2.5-fold higher in the NPC cell group as compared to normal or pathologic control group, but there was no correlation of Gb3 with the other lipid concentrations studied.For NPC diagnosis, the fibroblast cholesterol and total lipid quantification can be used as an alternative to the usual filipin test for lysosomal cholesterol, but both test methods are prone to equivocal results in cells from a small fraction of atypical NPC patients, where chemical testing in organ biopsies or mutational analysis of the NPC1 gene should be tried." @default.
• W2069834090 created "2016-06-24" @default.
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• W2069834090 date "2001-03-01" @default.
• W2069834090 modified "2023-09-27" @default.
• W2069834090 title "Quantified increases of cholesterol, total lipid and globotriaosylceramide in filipin-positive Niemann-Pick type C fibroblasts" @default.
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• W2069834090 doi "https://doi.org/10.1016/s0009-8981(00)00421-6" @default.
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