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• W2552053610 abstract "SIRT1, the NAD+-dependent protein deacetylase, controls cell-cycle progression and apoptosis by suppressing p53 tumour suppressor. Although SIRT1 is known to be phosphorylated by JNK1 upon oxidative stress and subsequently down-regulated, it still remains elusive how SIRT1 stability and activity are controlled. Here, we have unveiled that CHFR functions as an E3 Ub-ligase of SIRT1, responsible for its proteasomal degradation under oxidative stress conditions. CHFR interacts with and destabilizes SIRT1 by ubiquitylation and subsequent proteolysis. Such CHFR-mediated SIRT1 inhibition leads to the increase of p53 acetylation and its target gene transcription. Notably, CHFR facilitates SIRT1 destabilization when SIRT1 is phosphorylated by JNK1 upon oxidative stress, followed by prominent apoptotic cell death. Meanwhile, JNK inhibitor prevents SIRT1 phosphorylation, leading to elevated SIRT1 protein levels even in the presence of H2O2. Taken together, our results indicate that CHFR plays a crucial role in the cellular stress response pathway by controlling the stability and function of SIRT1." @default.
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• W2552053610 date "2016-11-24" @default.
• W2552053610 modified "2023-09-24" @default.
• W2552053610 title "CHFR negatively regulates SIRT1 activity upon oxidative stress" @default.
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• W2552053610 doi "https://doi.org/10.1038/srep37578" @default.
• W2552053610 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5121620" @default.
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