Abstract
Here we used mice lacking tumor necrosis factor-α (TNFα) and its associated receptors to study a model of demyelination and remyelination in which these events could be carefully controlled using a toxin, cuprizone. Unexpectedly, the lack of TNFα led to a significant delay in remyelination as assessed by histology, immunohistochemistry for myelin proteins and electron microscopy coupled with morphometric analysis. Failure of repair correlated with a reduction in the pool of proliferating oligodendrocyte progenitors (bromodeoxyuridine-labeled NG2+ cells) followed by a reduction in the number of mature oligodendrocytes. Analysis of mice lacking TNF receptor 1 (TNFR1) or TNFR2 indicated that TNFR2, not TNFR1, is critical to oligodendrocyte regeneration. This unexpected reparative role for TNFα in the CNS is important for understanding oligodendrocyte regeneration/proliferation, nerve remyelination and the design of new therapeutics for demyelinating diseases.
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Acknowledgements
This work was supported by NIH grants NS34190 (J.P.-Y.T.) and NS24453 (K.S.), as well as NMSS grants RG185 (J.P.-Y.T.) and RG254B (G.K.M.). We thank L. Old for the use of the TNFα−/− mice and R. Bagnell for his expertise in electron microscopy.
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Arnett, H., Mason, J., Marino, M. et al. TNFα promotes proliferation of oligodendrocyte progenitors and remyelination. Nat Neurosci 4, 1116–1122 (2001). https://doi.org/10.1038/nn738
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DOI: https://doi.org/10.1038/nn738
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