Abstract
Multiple Sclerosis (MS), is a disease that degenerates myelin in central nervous system (CNS). Reactive oxygen species (ROSs) are toxic metabolites, and accumulating data indicate that ROSs-mediated apoptosis of oligodendrocytes (OLGs) plays a major role in the pathogenesis of MS under oxidative stress conditions. In this study, we investigated the role of endogenous antioxidant alpha-lipoic acid (ALA) as ROSs scavenger in the OLGs loss and myelin degeneration during cuprizone (cup)-induced demyelination in the experimental model of MS. Our results have shown that ALA treatment significantly increased population of mature OLGs (MOG+ cells), as well as decreased oxidative stress (ROSs, COX-2 and PGE2) and apoptosis mediators (caspase-3 and Bax/Bcl2 ratio) in corpus callosum (CC). Surprisingly, ALA significantly stimulates population of NG2 chondroitin sulfate proteoglycan positive glia (NG2+ cells or polydendrocytes), from week 4 afterward. Accordingly ALA could prevents apoptosis, delays demyelination and recruits OLGs survival and regeneration mechanisms in CC. We conclude that ALA has protective effects against toxic demyelination via reduction of redox signaling, and alleviation of polydendrocytes vulnerability to excitotoxic challenge.
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Abbreviations
- ALA:
-
Alpha-lipoic acid
- CC:
-
Corpus callosum
- CNS:
-
Central nervous system
- COX-1:
-
Cyclooxygenase-1
- COX-2:
-
Cyclooxygenase-2
- MS:
-
Multiple Sclerosis
- MOG:
-
Myelin oligodendrocyte glycoprotein
- OLGs:
-
Oligodendrocytes
- OPCs:
-
Oligodendrocyte precursor cells
- PGE2:
-
Prostaglandin E2
- ROSs:
-
Reactive oxygen species
- RNSs:
-
Reactive nitrogen species
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The authors declare that there are no conflicts of interest.
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This work was supported by the Iran university medical science, grant number 81273037.
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Mehdi Mehdizadeh designed the study and collected funds. Nima Sanadgol performed the experiments and collected the data. Fatemeh Moradi did the statistical analysis and data interpretation, and finally marziyeh ajdary and nima sanadgol prepared the manuscript and literature search.
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Sanadgol, N., Golab, F., Askari, H. et al. Alpha-lipoic acid mitigates toxic-induced demyelination in the corpus callosum by lessening of oxidative stress and stimulation of polydendrocytes proliferation. Metab Brain Dis 33, 27–37 (2018). https://doi.org/10.1007/s11011-017-0099-9
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DOI: https://doi.org/10.1007/s11011-017-0099-9