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• W2023480443 startingPage "839" @default.
• W2023480443 abstract "Proteins are susceptible to various non-enzymatic post-translational modifications occurring during aging and in certain pathological states. The protein L-isoaspartyl methyltransferase (PIMT) is an enzyme that recognizes and repairs the abnormal L-isoaspartyl residues in proteins. Recently, we reported that PIMT expression was stimulated by the anti-epileptic drug valproic acid and that this was mediated through the glycogen synthase kinase-3 (GSK-3)/beta-catenin pathway. In this study, to gain further insights into which of the signaling pathways activated by valproic acid regulate PIMT abundance, astrocytoma U-87 MG and neuroblastoma SH-SY5Y cells were treated with this drug to investigate the possible involvement of the extracellular-regulated kinase (ERK) pathway in PIMT induction. Valproic acid increased ERK1/2 phosphorylation on Thr202/Tyr204 and Thr185/Tyr187, respectively. Pharmacological inhibitors against the kinases Src, c-Raf, MEK1/2 and ERK1/2 abolished the ERK1/2 phosphorylation stimulated by valproic acid, thus preventing PIMT induction by the drug. Furthermore, MEK1/2 inhibition with U0126 blocked the higher phosphorylation of RSK-1 on Thr359/Ser363 and of GSK-3beta on Ser9 as well as the increased expression of RSK-1, beta-catenin and PIMT upon treatment with valproic acid. RSK-1 knockdown by interfering RNA abrogated the increased expression of RSK-1, beta-catenin and PIMT as well as the induced phosphorylation of RSK-1 and GSK-3beta due to valproic acid. Thus, our findings demonstrated that PIMT up-regulation by valproic acid required the activation of the ERK signaling pathway including RSK-1 the latter being responsible for inactivating GSK-3 and subsequently leading to beta-catenin stabilization." @default.
• W2023480443 created "2016-06-24" @default.
• W2023480443 creator A5054079538 @default.
• W2023480443 creator A5059806162 @default.
• W2023480443 date "2009-04-01" @default.
• W2023480443 modified "2023-10-17" @default.
• W2023480443 title "Valproic acid enhances protein l-isoaspartyl methyltransferase expression by stimulating extracellular signal-regulated kinase signaling pathway" @default.
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• W2023480443 doi "https://doi.org/10.1016/j.neuropharm.2009.01.008" @default.
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