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• W2022344041 abstract "AbstractReactive oxygen species (ROS) are key intermediates in cellular signal transduction pathways whose function may be counterbalanced by antioxidants. Acting as an antioxidant, ascorbic acid (AA) donates two electrons and becomes oxidized to dehydroascorbic acid (DHA). We discovered that DHA directly inhibits IκBα kinase β (IKKβ) and IKKα enzymatic activity in vitro, whereas AA did not have this effect. When cells were loaded with AA and induced to generate DHA by oxidative stress in cells expressing a constitutive active IKKβ, NF-κB activation was inhibited. Our results identify a dual molecular action of vitamin C in signal transduction and provide a direct linkage between the redox state of vitamin C and NF-κB signaling events. AA quenches ROS intermediates involved in the activation of NF-κB and is oxidized to DHA, which directly inhibits IKKβ and IKKα enzymatic activity. These findings define a function for vitamin C in signal transduction other than as an antioxidant and mechanistically illuminate how vitamin C down-modulates NF-κB signaling. We thank Richard Gaynor for providing the pFLAG-CMV2-IKK2, pRcBactin3xHA-IKK1κ, and pFLAG-CMV2-IKK2(SS/EE) plasmids.This work was supported in part by grants from the National Institutes of Health (CA30388), New York State Department of Health, and Lebensfeld Foundation." @default.
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• W2022344041 date "2004-08-01" @default.
• W2022344041 modified "2023-10-11" @default.
• W2022344041 title "Vitamin C Is a Kinase Inhibitor: Dehydroascorbic Acid Inhibits IκBα Kinase β" @default.
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• W2022344041 doi "https://doi.org/10.1128/mcb.24.15.6645-6652.2004" @default.
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