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- W2024142707 abstract "DNA damage by ionizing radiation (IR) can induce activations of both NF-kappaB and p53 through the upstream kinase ataxia telangiectasia mutated (ATM). NF-kappaB activation could also be signaled through two distinct or overlapped pathways; IkappaB kinases (IKKs)-IkappaBalpha and Akt-glycogen synthase kinase-3 (GSK-3). In the present study, however, we show that activation of Akt1 and the subsequent phosphorylation and inactivation of GSK-3beta by IR could also occur in ATM-deficient AT5BIVA cells as well as in normal MRC5CV1 fibroblasts. Similarly, lithium chloride (LiCl) was found to increase the phosphorylation of GSK-3beta independently of ATM. Transfection with either wild-type or kinase dead mutant GSK-3beta to the cells further indicated that phosphorylations of Akt1 and GSK-3beta were closely associated with the transcriptional transactivation of NF-kappaB in response to ionizing radiation. On the other hand, LiCl, having no effect on caspase-3 activation, significantly increased p53 phosphorylation and apoptotic death of the normal MRC5CV1 cells while IR, activating both caspase-3 and p53, profoundly affected AT5BIVA cell death. Hence, our data suggest that although ATM-mediated IKK-IkappaBalpha pathway might be a typical pathway for IR-induced NF-kappaB activation, GSK-3beta phosphorylation could also partially contribute to the transcriptional transactivation of NF-kappaB in an ATM-independent manner and that GSK-3beta phosphorylation could induce ATM-mediated cell apoptosis through the activation of p53." @default.
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- W2024142707 date "2008-04-01" @default.
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- W2024142707 title "Ionizing radiation can induce GSK-3β phosphorylation and NF-κB transcriptional transactivation in ATM-deficient fibroblasts" @default.
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- W2024142707 doi "https://doi.org/10.1016/j.cellsig.2007.10.022" @default.
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