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• W2022779304 abstract "Cellular senescence is characterized by impaired cell proliferation. We have previously shown that, relative to the young counterpart, senescent WI-38 human fibroblasts display a decreased abundance of active phosphorylated ERK (p-ERK) in the nucleus. We have tested the hypothesis that this is due to elevated levels of nuclear MAP kinase phosphatase (MKP) activity in senescent cells. Our results indicate that the activity and abundance of MKP-2 is increased in senescent fibroblasts, compared to their young counterparts. Further analysis indicates that it is MKP-2 protein, but not MKP-2 mRNA level, that is increased in senescent cells. This increase is the result of the increased stability of MKP-2 protein against proteolytic degradation. The degradation of MKPs was impaired by proteasome inhibitors both in young and old WI-38 cells, indicating that proteasome activity is involved in the degradation of MKPs. Finally, our results indicate that proteasome activity, in general, is diminished in senescent fibroblasts. Taken together, these data indicate that the increased level and activity of MKP-2 in senescent WI-38 cells are the consequence of impaired proteosomal degradation, and this increase is likely to play a significant role in the decreased levels of p-ERK in the nucleus of senescent cells." @default.
• W2022779304 created "2016-06-24" @default.
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• W2022779304 date "2003-11-01" @default.
• W2022779304 modified "2023-10-13" @default.
• W2022779304 title "Metabolic stabilization of MAP kinase phosphatase-2 in senescence of human fibroblasts" @default.
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• W2022779304 doi "https://doi.org/10.1016/s0014-4827(03)00309-4" @default.
• W2022779304 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/14567979" @default.
• W2022779304 hasPublicationYear "2003" @default.
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