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- W2043467684 abstract "Little attention has been devoted to studying the roles of natural antioxidants in the ubiquitin-proteasome pathway during oxidative stress. We demonstrated that a time course revealed that the reassociation of the 19S regulators with the 20S proteasomes occurred automatically and rapidly to reconstitute the 26S proteasomes, with up to 80% completion, within 5 min after H2O2 treatment. Ubiquitin, methyl gallate and tannic acid are able to prevent H2O2 from inhibiting the 26S activity. We further show that the level of the ubiquitin, S5a and 20S core subunits decreased within 30 min and increased after 24 h of H2O2 treatment in Hep-2 cells. Phenolic compounds not only inhibited the 26S activity but also decreased the USP47 levels, which reduce the DNA damage repair rate during oxidative stress; in addition, the presence of DNA fragments, procaspase-3 and a decreased poly (ADP-ribose) polymerase also appeared as a result of the above conditions. Ubiquitin could serve as a protective substrate in H2O2 and phenolic compound-treated Hep-2 cells. Methyl gallate and tannic acid, as prooxidants, can attenuate the apoptotic response resulting from long-term oxidative stress. Collectively, these data demonstrate an important role for phenolic compounds in regulating the 26S proteasome and ubiquitin during oxidative stress." @default.
- W2043467684 created "2016-06-24" @default.
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- W2043467684 date "2013-11-01" @default.
- W2043467684 modified "2023-09-26" @default.
- W2043467684 title "Regulation of ubiquitin and 26S proteasome mediated by phenolic compounds during oxidative stress" @default.
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- W2043467684 doi "https://doi.org/10.1016/j.jnutbio.2013.07.001" @default.
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