Abstract
In vivo remyelination promoted by a combination of four oligodendrocyte specific growth factors (GFs) in cuprizone-induced demyelinated mice brains was described recently by our group [1]. Here we report activation of inflammatory response in mice brain following cuprizone-induced demyelination and its further enhancement immediately after injection of growth factors in vivo, while no significant inflammatory response was evident in GFs-injected normal brains. Cuprizone-induced demyelination was accompanied by increased expression of inflammatory cytokines, TNFα and IL-1β, anti-inflammatory cytokines TGFβ, IL-10 and increased levels of chemokines, CCL2, CCL5, and CXCL10, produced by resident microglia and astrocytes. During demyelination, involvement of oxidative stress was evident by disruption of mitochondrial structure and temporal decline in reduced glutathione levels, later returning to normal. Increase in the cytokines and chemokines was further enhanced within 2 days post injection (dpi) of GFs, coinciding with signal for repair via activation of pAkt and NFκB transcription factor reported earlier. Upregulation of mRNA and protein level of antioxidant genes, metallothionein (MT) I/II and activity of a cytosolic oxidoreductase enzyme, glycerolphosphate-3 dehydrogenase (cGPDH) occurred, resulting in a metabolic shuttle with an increase in glycerol in mice brains during period of demyelination and early GF-mediated repair.
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Acknowledgements
We thank Dr. Seema Tiwari-Woodruff for her critical reading of the manuscript and Donna Crandall for her assistance in preparation of figures. This work was supported by National Institute of Health NICHD grant HD-06576.
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Special issue article in honor of Dr. Anna Maria Giuffrida-Stella.
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Biancotti, J.C., Kumar, S. & de Vellis, J. Activation of Inflammatory Response by a Combination of Growth Factors in Cuprizone-Induced Demyelinated Brain Leads to Myelin Repair. Neurochem Res 33, 2615–2628 (2008). https://doi.org/10.1007/s11064-008-9792-8
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DOI: https://doi.org/10.1007/s11064-008-9792-8