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• W2104457046 endingPage "2090" @default.
• W2104457046 startingPage "2083" @default.
• W2104457046 abstract "Nicotinamide, the principal form of niacin (vitamin B3), has been proposed to be neuroprotective in Parkinson's disease. However, the effects and mechanisms of nicotinamide on motor function in animals and on mitochondrial function in cellular systems have not been well studied. We hypothesized that niacin-derived NAD(P)H as antioxidants and enzyme cofactors could inhibit oxidative damage and improve mitochondrial function and thus protect neurodegeneration and improve motor function. In the present study, the effects of nicotinamide on mitochondrial function and oxidative stress were studied in a 1-methyl-4-phenylpyridinium (MPP(+))-induced cellular model of Parkinson's disease, and the effects of improving motor dysfunction were studied in an alpha-synuclein transgenic Drosophila Parkinson's model. Mitochondrial function was tested by measuring the activity of mitochondrial complex I and alpha-ketoglutarate dehydrogenase, and oxidative damage was tested by measuring reactive oxygen species, DNA damage (8-oxo-7,8-dihydro-2'-deoxyguanosine and Comet assay), and protein oxidation (protein carbonyls) levels. Nicotinamide at a relatively higher concentration, that is, 100-fold of the level in the cell culture medium (101 mg/L), significantly protected SK-N-MC human neuroblastoma cells from an MPP(+)-induced decrease in cell viability, complex I and alpha-ketoglutarate dehydrogenase activity, and an increase in oxidant generation, DNA damage, and protein oxidation. In the Drosophila model, nicotinamide at 15 and 30 mg/100 g diet significantly improved climbing ability. These results suggest that nutritional supplementation of nicotinamide at high doses decreases oxidative stress and improves mitochondrial and motor function in cellular and/or Drosophila models and may be an effective strategy for preventing and ameliorating Parkinson's disease." @default.
• W2104457046 created "2016-06-24" @default.
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• W2104457046 date "2008-07-01" @default.
• W2104457046 modified "2023-10-18" @default.
• W2104457046 title "High doses of nicotinamide prevent oxidative mitochondrial dysfunction in a cellular model and improve motor deficit in a<i>Drosophila</i>model of Parkinson's disease" @default.
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• W2104457046 doi "https://doi.org/10.1002/jnr.21650" @default.
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