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- W2069492079 abstract "Abstract The potential role of 4‐hydroxynonenal (HNE), a major product of membrane lipid peroxidation, in regulating glycogen synthase kinase‐3β (GSK3β) activity was examined in human neuroblastoma IMR‐32 cells. The inhibition of GSK3β activity by HNE was observed by in vitro kinase assays with two substrates, the synthetic glycogen synthase peptide‐2 and the human recombinant tau. GSK3β activity is regulated by Ser9 (inhibitory) and Tyr216 (stimulatory) phosphorylation. By using specific activity‐dependent phospho‐antibodies, immunoblot analysis revealed that HNE induces an increase in phosphorylation of GSK3β in Ser9, enhancing basal phosphatidylinositol 3‐kinase (PI3K)/AKT and extracellular signal‐regulated kinase 2 (ERK2) signalling pathways. Ser9‐GSK3β phosphorylation induced by HNE was abolished by treatment with LY294002 or U0126, two inhibitors of PI3K/AKT and ERK pathways, respectively. These experiments provide evidence for a crucial role of the PI3K/AKT and ERK2 pathways as intracellular targets of HNE that mediate the inhibition of GSK3β activity in regulating cellular response to HNE in viable cells under conditions in which membrane lipid peroxidation occurs. These data support a key role for GSK3β as a mediator of the signalling pathways activated by oxidative stress, and therefore it may be included among the redox‐sensitive enzymes." @default.
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- W2069492079 date "2004-04-29" @default.
- W2069492079 modified "2023-10-12" @default.
- W2069492079 title "Regulation of glycogen synthase kinase-3beta by products of lipid peroxidation in human neuroblastoma cells" @default.
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- W2069492079 doi "https://doi.org/10.1111/j.1471-4159.2004.02413.x" @default.
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