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- W2022127583 abstract "The hypothesis tested was PKCalpha mediates the phosphorylation of glycogen synthetase kinase 3beta (GSK3beta) and that the GSK3beta inhibition modulates the response to tumor necrosis factor-alpha (TNF) in rat pulmonary microvessel endothelial cells (PMEC). PMEC were treated with TNF for 4.0 h (100 ng/ml) or vehicle. First, to assess the role of PKCalpha in the phosphorylation of GSK3beta (i.e., an indicator of GSK3beta inhibition), PMEC were pretreated with 1) nonsense-RNA-PKCalpha, 2) siRNA-PKCalpha, and 3) the PKC inhibitor Gö6983. In the nonsense RNA-PKCalpha+TNF and TNF groups, there was increased phosphorylated GSK3beta-Ser9 that did not occur in the Gö6983+TNF group. In the TNF groups, there was a significant correlation between PKCalpha protein and phosphorylated GSK3beta-Ser9 that did not occur in the groups without TNF. Second, to assess the role of GSK3beta in beta-catenin activity, PMEC were pretreated with 1) wild-type (w) GSK3beta plasmid to enhance GSK3beta activity, 2) kinase dead (kd)-GSK3beta plasmid, and 3) the GSK3beta inhibitor SB-216763. In the TNF group, there was increased unphosphorylated beta-catenin-Ser37/33 compared with the control group. In the GSK3beta-inhibited groups (i.e., SB-216763 and kdGSK3beta) +/- TNF, the unphosphorylated beta-catenin-Ser37/33 was similar to the TNF group. In the GSK3beta-enhanced group +/- TNF, the unphosphorylated beta-catenin-Ser37/33 was similar to the control. Finally, PMEC were also treated with TOPflash, a beta-catenin-dependent promoter luciferase reporter, or the mutant construct FOPflash, 2 days before treatment with TNF. In the TNF group, there was an increased TOPflash/FOPflash activity ratio compared with the control group. In the GSK3beta-inhibited groups (i.e., SB-216763 and kdGSK3beta) +/- TNF, the TOPflash/FOPflash activity ratio was similar to the TNF group. In the GSK3beta-enhanced group +/- TNF, the TOPflash/FOPflash activity ratio was similar to the control. The data indicate that TNF induces endothelial activation that is modulated by a PKCalpha-dependent inhibition of GSK3beta." @default.
- W2022127583 created "2016-06-24" @default.
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- W2022127583 date "2009-04-01" @default.
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- W2022127583 title "TNF-induced activation of pulmonary microvessel endothelial cells: a role for GSK3β" @default.
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- W2022127583 doi "https://doi.org/10.1152/ajplung.90566.2008" @default.
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