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Oligodendrocyte loss during the disease course in a canine model of the lysosomal storage disease fucosidosis

Citation

Fletcher, JL and Kondagari, GS and Vite, CH and Williamson, P and Taylor, RM, Oligodendrocyte loss during the disease course in a canine model of the lysosomal storage disease fucosidosis, Journal of Neuropathology and Experimental Neurology, 73, (6) pp. 536-547. ISSN 0022-3069 (2014) [Refereed Article]


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DOI: doi:10.1097/NEN.0000000000000075

Abstract

Hypomyelination is a poorly understood feature of many neurodegenerative lysosomal storage diseases, including fucosidosis in children and animals. To gain insight into hypomyelination in fucosidosis, we investigated lysosomal storage, oligodendrocyte death, and axonal and neuron loss in CNS tissues of fucosidosis-affected dogs aged 3 weeks to 42 months using immunohistochemistry, electron microscopy, and gene expression assays. Vacuole accumulation in fucosidosis oligodendrocytes commenced by 5 weeks of age; all oligodendrocytes were affected by 16 weeks. Despite progressive vacuolation, mature oligodendrocyte loss by apoptosis (caspase-6 positive) in the corpus callosum and cerebellar white matter stabilized by 16 weeks, with no further subsequent loss. Axonal neurofilament loss progressed only in late disease, suggesting that disturbed axon-oligodendrocyte interactions are unlikely to be the primary cause of hypomyelination. A 67% decline in the number of Purkinje cell layer oligodendrocytes coincided with a 67% increase in the number of caspase-6-positive Purkinje cells at 16 weeks, suggesting that early oligodendrocyte loss contributes to Purkinje cell apoptosis. Fucosidosis hypomyelination appeared to follow normal spatiotemporal patterns of myelination, with greater loss of oligodendrocytes and larger downregulation of CNP, MAL, and PLP1 genes at 16 weeks in the cerebellum versus the frontal cortex. These studies suggest that survival of oligodendrocytes in fucosidosis is limited during active myelination, although the mechanisms remain unknown.

Item Details

Item Type:Refereed Article
Keywords:lysosomal storage disease, animal model, demyelinating disease, oligodendrocytes
Research Division:Biomedical and Clinical Sciences
Research Group:Neurosciences
Research Field:Cellular nervous system
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the biomedical and clinical sciences
UTAS Author:Fletcher, JL (Dr Jessica Fletcher)
ID Code:147211
Year Published:2014
Web of Science® Times Cited:10
Deposited By:Menzies Institute for Medical Research
Deposited On:2021-10-19
Last Modified:2021-11-01
Downloads:0

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