Journal Article

Alleviation of neuronal ganglioside storage does not improve the clinical course of the Niemann–Pick C disease mouse

Yujing Liu, Yun-Ping Wu, Ryuichi Wada, Edward B. Neufeld, Katherine A. Mullin, April C. Howard, Peter G. Pentchev, Marie T. Vanier, Kinuko Suzuki and Richard L. Proia

in Human Molecular Genetics

Volume 9, issue 7, pages 1087-1092
Published in print April 2000 | ISSN: 0964-6906
Published online April 2000 | e-ISSN: 1460-2083 | DOI: http://dx.doi.org/10.1093/hmg/9.7.1087
Alleviation of neuronal ganglioside storage does not improve the clinical course of the Niemann–Pick C disease mouse

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Niemann–Pick disease Type C (NP-C) is a progressive neurodegenerative disorder caused by mutations in the NPC1 gene and characterized by intracellular accumulation of cholesterol and sphingo­lipids. The major neuronal storage material in NP-C consists of gangliosides and other glycolipids, raising the possibility that the accumulation of these lipids may participate in the neurodegenerative process. To determine if ganglioside accumulation is a crucial factor in neuropathogenesis, we bred NP-C model mice with mice carrying a targeted mutation in GalNAcT, the gene encoding the β-1-4GalNAc transferase responsible for the synthesis of GM2 and complex gangliosides. Unlike the NP-C model mice, these double mutant mice did not exhibit central nervous system (CNS) accumulation of gangliosides GM2 or of glycolipids GA1 and GA2. Histological analysis revealed that the characteristic neuronal storage pathology of NP-C disease was substantially reduced in the double mutant mice. By contrast, visceral pathology was similar in the NP-C and double mutant mice. Most notably, the clinical phenotype of the double mutant mice, in the absence of CNS ganglioside accumulation and associated neuronal pathology, did not improve. The results demonstrate that complex ganglioside storage, while responsible for much of the neuronal pathology, does not significantly influence the clinical phenotype of the NP-C model.

Journal Article.  4181 words.  Illustrated.

Subjects: Genetics and Genomics

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