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Immunological studies on lysosomal sphingomyelinase: Identification of a 28 000-Da component deficient in urine from patients with Niemann-Pick disease types A and B

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Bioscience Reports

Abstract

The immunoblotting technique was used to identify sphingomyeJinase protein in samples of tissue and urine after subjection to poIyacrylamide-gel etectrophoresis in the presence of sodium dodecyl sulphate. In a sphingomyelinase preparation purified from control urine a prominent band was seen with an Mr of 28 000 Da. Glycoprotein fractions from urine and placenta, a membrane extract from spleen, and a partially purified sphingomyelinase preparation from placenta contained the 28 000-Da band plus additional, higher-Mr bands. The 28 000-Da band was detectable in urine from a patient with Niemann-Pick disease type C, but not in urine from patients with Niemann-Pick disease types A and B. It is concluded t h a t sphingomyeJinase is composed of at least one polypeptide with an Mr of 28 000 Da and that this polypeptide is deficient in the urine of patients with Niemann-Pick disease types A and B.

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Schram, A.W., Dreissen, M., Bastiaannet, J. et al. Immunological studies on lysosomal sphingomyelinase: Identification of a 28 000-Da component deficient in urine from patients with Niemann-Pick disease types A and B. Biosci Rep 4, 1051–1057 (1984). https://doi.org/10.1007/BF01116698

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  • DOI: https://doi.org/10.1007/BF01116698

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