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• W2896429875 abstract "Protein phosphatase methylesterase-1 (PME-1) is a serine hydrolase that catalyzes protein phosphatase 2A (PP2A) demethylation and negatively regulates its activity. PME-1 is compartmentalized within cells to precisely control the demethylation of PP2A. This study investigated the localization of PME-1 in human fibroblast cells (HDF) under oxidative stress.Alkaline demethylation and peptide competition assays were applied to detect the methylation sensitivity of anti-PP2Ac. The localization of PME-1, leucine carboxyl methyltransferase 1 (LCMT1), demethylated-phosphorylated-PP2Ac (dem-p-PP2Ac) and total PP2Ac was determined by immunofluorescence analysis, and protein expression was measured by Western blot. A HEK293 cell line stably expressing constructed PME-1-EGFP was used to dynamically monitor the nuclear export of PME-1 under oxidative stress.After hydrogen peroxide (H2O2) treatment, the protein expression of PME-1 remained unchanged, while PME-1 facilitated redistribution from the nucleus to the cytoplasm in HDF according to immunofluorescence analysis. In constructed HEK293 cells, the EGFP-tagged PME-1 was exported from the nucleus to the cytoplasm after H2O2 treatment, and nuclear export was eliminated after leptomycin B additions. Our observation of dem-p-PP2Ac species relocation from the nucleus to the cytoplasm under oxidative stress is consistent with the redistribution patterns of PME-1. Antioxidant N-acetyl cysteine can reverse the nuclear to cytoplasmic ratio of PME-1 proteins and dem-p-PP2Ac after H2O2 exposure.We found that PME-1 is exported from the nucleus to the cytoplasm upon H2O2 treatment and redistributes dem-p-PP2Ac in subcellular compartments. These findings offer new insight into the regulation of PME-1 localization and PP2A demethylation under oxidative stress." @default.
• W2896429875 created "2018-10-26" @default.
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• W2896429875 date "2018-11-01" @default.
• W2896429875 modified "2023-10-17" @default.
• W2896429875 title "Hydrogen peroxide redistributes the localization of protein phosphatase methylesterase 1" @default.
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• W2896429875 doi "https://doi.org/10.1016/j.lfs.2018.10.029" @default.
• W2896429875 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30340029" @default.
• W2896429875 hasPublicationYear "2018" @default.
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