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Related Experiment Videos

Niemann-Pick disease type C: an update.

M T Vanier1, P Pentchev, C Rodriguez-Lafrasse

  • 1Department of Biochemistry, INSERM U 189, Faculté de Médecine Lyon-Sud, Oullins, France.

Journal of Inherited Metabolic Disease
|January 1, 1991
PubMed
Summary
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Niemann-Pick disease type C is a distinct disorder characterized by abnormal intracellular cholesterol transport, not sphingomyelinase deficiency. This finding enables reliable diagnosis and offers new insights into neurolipidosis.

Area of Science:

  • Biochemistry
  • Genetics
  • Cell Biology

Background:

  • Niemann-Pick disease type C (NPC) is increasingly recognized as a secondary sphingomyelin storage disorder.
  • Unlike types A and B, NPC involves complex lipid storage and variable sphingomyelinase activity.
  • The primary genetic defect remains elusive, but recent research highlights cholesterol metabolism abnormalities.

Purpose of the Study:

  • To investigate the unique abnormalities in intracellular cholesterol translocation in Niemann-Pick disease type C.
  • To define the phenotypic heterogeneity and clinical presentation in a large patient cohort.
  • To explore the implications of cholesterol transport defects for disease pathogenesis and diagnosis.

Main Methods:

  • Analysis of intracellular cholesterol translocation in cultured patient fibroblasts.

Related Experiment Videos

  • Assessment of homeostatic responses to exogenous cholesterol, including cholesteryl ester formation.
  • Clinical and biochemical correlation in a large patient population.

    • Main Results:

    • A characteristic block in the intracellular translocation of exogenous cholesterol was identified.
    • This defect leads to delayed cholesterol homeostasis and accumulation of unesterified cholesterol in lysosomes.
    • Endogenous cholesterol transport appears unaffected.
    • Phenotypic heterogeneity was correlated with abnormal LDL processing.

    Conclusions:

    • Niemann-Pick disease type C is a distinct nosological entity separate from types A and B.
    • The identified cholesterol transport defect provides a basis for reliable prenatal and patient diagnosis.
    • NPC may serve as a model for a new molecular understanding of neurolipidosis and inherited metabolic diseases.