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Compound | Specification | Antioxidant characteristics | Relevance for MS |
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Coenzyme Q10 | Coenzyme | Energy transfer molecule, cofactor in mitochondrial electron transport chain | Increases SOD and decreases malondialdehyde A in RRMS patients; synthetic analog has no effect on EAE |
Curcumin | Natural pigment | ROS, RNS, and peroxyl radical scavenger; it also modulated GSH, catalase, and SOD activities [190] | Decreases EAE clinical severity, demyelination, and inflammation in the spinal cord and IL-12 production by macrophages/microglia through Janus kinase-STAT pathway [191] |
Melatonin | Neurohormone | Activates SOD, catalase, and GPx | It increases SOD and GPx levels in erythrocytes of SPMS patients. Its levels negatively correlate with lesion activity. It ameliorates EAE symptoms, blocks Th17 differentiation and promotes Tr1 expansion. |
Vitamin A | Essential nutrient (retinoic acid) | Hydrophobic polyene chain quenches singlet oxygen and neutralizes thiyl radicals stabilizing peroxyl radicals [192]. | Serum levels are low in MS patients during relapses [193]. It increases TGFbeta and FoxP3 expression in PBMCs in Avonex-treated RRMS patients [194]. Retinoic acid inhibits cytokine production by Th17 cells in EAE [195]. |
Vitamin C | Essential nutrient (ascorbic acid) | Scavenges ROS and RNS [196] | Serum levels are low in MS patients during relapses [193]. It promotes OLGs generation and remyelination [197]. |
Vitamin D | Essential nutrient | Inhibits iron-dependent lipid peroxidation [198] | Serum levels are low in MS patients with elevated relapse frequency [199]. It diminishes risk of MS although the therapeutic value is still debated [200]. |
Vitamin E | Essential nutrient (alpha-tocopherol) | Peroxyl radical scavenger [201] | Serum levels are low in MS patients during relapses [193]. During IFNβ treatment, decreased MRI activity in RRMS patients is associated with higher levels of alpha-tocopherol [202]. It decreases IFNγ production, inflammation, and demyelination in the spinal cord of EAE mice [203]. |
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