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Open AccessArticle

Different Trafficking Phenotypes of Niemann-Pick C1 Gene Mutations Correlate with Various Alterations in Lipid Storage, Membrane Composition and Miglustat Amenability

1
Department of Physiological Chemistry, University of Veterinary Medicine Hannover, 30559 Hannover, Germany
2
Department of Paediatrics, Hannover Medical School, Carl-Neuberg-Strasse 1, 30625 Hannover, Germany
3
Department of Natural Sciences, Lebanese American University, Beirut 1102-2801, Lebanon
*
Author to whom correspondence should be addressed.
These authors contribute equally to this work.
Shared last authors.
§
Current address: Institute for Experimental Virology, TWINCORE, Centre for Experimental and Clinical Infection Research, 30165 Hannover, Germany.
Int. J. Mol. Sci. 2020, 21(6), 2101; https://doi.org/10.3390/ijms21062101
Received: 29 February 2020 / Revised: 15 March 2020 / Accepted: 16 March 2020 / Published: 19 March 2020
Niemann-Pick Type C (NPC) is an autosomal recessive lysosomal storage disease leading to progressive neurodegeneration. Mutations in the NPC1 gene, which accounts for 95% of the cases, lead to a defect in intra-lysosomal trafficking of cholesterol and an accumulation of storage material including cholesterol and sphingolipids in the endo-lysosomal system. Symptoms are progressive neurological and visceral deterioration, with variable onset and severity of the disease. This study investigates the influence of two different NPC1 mutations on the biochemical phenotype in fibroblasts isolated from NPC patients in comparison to healthy, wild type (WT) cells. Skin derived fibroblasts were cultured from one patient compound-heterozygous for D874V/D948Y mutations, which presented wild-type like intracellular trafficking of NPC1, and a second patient compound- heterozygous for I1061T/P887L mutations, which exhibited a more severe biochemical phenotype as revealed in the delayed trafficking of NPC1. Biochemical analysis using HPLC and TLC indicated that lipid accumulations were mutation-dependent and correlated with the trafficking pattern of NPC1: higher levels of cholesterol and glycolipids were associated with the mutations that exhibited delayed intracellular trafficking, as compared to their WT-like trafficked or wild type (WT) counterparts. Furthermore, variations in membrane structure was confirmed in these cell lines based on alteration in lipid rafts composition as revealed by the shift in flotillin-2 (FLOT2) distribution, a typical lipid rafts marker, which again showed marked alterations only in the NPC1 mutant showing major trafficking delay. Finally, treatment with N-butyldeoxynojirimycin (NB-DNJ, Miglustat) led to a reduction of stored lipids in cells from both patients to various extents, however, no normalisation in lipid raft structure was achieved. The data presented in this study help in understanding the varying biochemical phenotypes observed in patients harbouring different mutations, which explain why the effectiveness of NB-DNJ treatment is patient specific. View Full-Text
Keywords: Niemann-Pick type C; cholesterol; Miglustat (N-butyldeoxynojirimycin; NB-DNJ); lipid rafts Niemann-Pick type C; cholesterol; Miglustat (N-butyldeoxynojirimycin; NB-DNJ); lipid rafts
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MDPI and ACS Style

Brogden, G.; Shammas, H.; Walters, F.; Maalouf, K.; Das, A.M.; Naim, H.Y.; Rizk, S. Different Trafficking Phenotypes of Niemann-Pick C1 Gene Mutations Correlate with Various Alterations in Lipid Storage, Membrane Composition and Miglustat Amenability. Int. J. Mol. Sci. 2020, 21, 2101. https://doi.org/10.3390/ijms21062101

AMA Style

Brogden G, Shammas H, Walters F, Maalouf K, Das AM, Naim HY, Rizk S. Different Trafficking Phenotypes of Niemann-Pick C1 Gene Mutations Correlate with Various Alterations in Lipid Storage, Membrane Composition and Miglustat Amenability. International Journal of Molecular Sciences. 2020; 21(6):2101. https://doi.org/10.3390/ijms21062101

Chicago/Turabian Style

Brogden, Graham; Shammas, Hadeel; Walters, Friederike; Maalouf, Katia; Das, Anibh M.; Naim, Hassan Y.; Rizk, Sandra. 2020. "Different Trafficking Phenotypes of Niemann-Pick C1 Gene Mutations Correlate with Various Alterations in Lipid Storage, Membrane Composition and Miglustat Amenability" Int. J. Mol. Sci. 21, no. 6: 2101. https://doi.org/10.3390/ijms21062101

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