Cholesterol Movement in Niemann-Pick Type C Cells and in Cells Treated with Amphiphiles
نویسندگان
چکیده
منابع مشابه
Cyclodextrin overcomes deficient lysosome-to-endoplasmic reticulum transport of cholesterol in Niemann-Pick type C cells.
A handoff model has been proposed to explain the egress from lysosomes of cholesterol derived from receptor-mediated endocytosis of LDL. Cholesterol is first bound by soluble Niemann-Pick C2 (NPC2) protein, which hands off the cholesterol to the N-terminal domain of membrane-bound NPC1. Cells lacking NPC1 or NPC2 accumulate LDL-derived cholesterol in lysosomes and fail to deliver LDL cholestero...
متن کاملActivation Mobilizes the Cholesterol in the Late Endosomes-Lysosomes of Niemann Pick Type C Cells
A variety of intercalating amphipaths increase the chemical activity of plasma membrane cholesterol. To test whether intracellular cholesterol can be similarly activated, we examined NPC1 and NPC2 fibroblasts, since they accumulate large amounts of cholesterol in their late endosomes and lysosomes (LE/L). We gauged the mobility of intracellular sterol from its appearance at the surface of the i...
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Bone marrow aspiration is the preliminary investigation in Niemann Pick disease type A when enzyme assays and mutation studies are unavailable. We report an infant with typical phenotype and enzyme deficiency, but undetectable Niemann Pick cells in the bone marrow. A new mutation R542X in SMPD gene was also detected.
متن کاملNiemann-Pick type C disease.
A 4-year-old Afghan girl born to consanguineous parents presented with progressive neurological regression and hepatomegaly noticed after one year of age. The child had hypotonia, repeated unexplained falls and facial dyskinesia. Bone marrow examination revealed presence of storage cells suggestive of Gauchers or Niemann Pick. Confirmatory study by lysosomal enzyme from leucocytes was normal fo...
متن کامل[Niemann-Pick disease (type C)].
A 15-year old girl with slowly progressive gait and speech disorders, and with impairment of mental ability, is decsribed. The disease appeared 18 months before the first hospitalization at the Department of Neurology and Physchiatry for Children and Young People. Neurological and other examinations confirmed extrapyramidal and cerebellar signs, conspisuous knee and ankle reflexes, marked splen...
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ژورنال
عنوان ژورنال: Journal of Biological Chemistry
سال: 2000
ISSN: 0021-9258
DOI: 10.1074/jbc.m000875200