Abstract
The cuprizone model is a suitable animal model of de- and remyelination secondary to toxin-induced oligodendrogliopathy. From a pharmaceutical point of view, the cuprizone model is a valuable tool to study the potency of compounds which interfere with toxin-induced oligodendrocyte cell death or boost/inhibit remyelinating pathways and processes. The aim of this study was to analyze the vulnerability of neighboring white mater tracts (i.e., the fornix and cingulum) next to the midline of the corpus callosum which is the region of interest of most studies using this model. Male mice were fed cuprizone for various time periods. Different white matter areas were analyzed for myelin (anti-PLP), microglia (anti-IBA1), and astrocyte (anti-GFAP) responses by means of immunohistochemistry. Furthermore, Luxol fast blue–periodic acid Schiff stains were performed to validate loss of myelin-reactive fibers in the different regions. Cuprizone induced profound demyelination of the midline of the corpus callosum and medial parts of the cingulum that was paralleled by a significant astrocyte and microglia response. In contrast, lateral parts of the corpus callosum and the cingulum, as well as the fornix region which is just beneath the midline of the corpus callosum appeared to be resistant to cuprizone exposure. Furthermore, resistant areas displayed reduced astrogliosis and microgliosis. This study clearly demonstrates that neighboring white matter tracts display distinct vulnerability to toxin-induced demyelination. This important finding has direct relevance for evaluation strategies in this frequently used animal model for multiple sclerosis.
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Acknowledgments
We would like to thank H. Helten and S. Vidal de la Torre for technical assistance. This study was supported by a START grant of the Medical Faculty, RWTH Aachen (TC).
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T. Schmidt and H. Awad contributed equally to this work.
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Schmidt, T., Awad, H., Slowik, A. et al. Regional Heterogeneity of Cuprizone-Induced Demyelination: Topographical Aspects of the Midline of the Corpus Callosum. J Mol Neurosci 49, 80–88 (2013). https://doi.org/10.1007/s12031-012-9896-0
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DOI: https://doi.org/10.1007/s12031-012-9896-0