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- W2021736150 abstract "We analyzed the effects of PKNalpha and protein kinase C (PKC) on phosphorylation of tau protein by glycogen synthase kinase (GSK)-3beta using monoclonal antibodies (AT8, AT180, and AT270). These antibodies are highly specific for phosphorylated tau in Alzheimer paired helical filaments, and recognize phosphorylated Ser202/Thr205, Thr231, and Thr181 of tau protein, respectively. Immunoblot analysis demonstrated that PKNalpha and PKC did not directly phosphorylate their sites, whereas GSK-3beta efficiently did so. Incubating GSK-3beta with PKNalpha or PKC subtypes inhibited subsequent GSK-3beta-induced AT8 and AT270 immunoreactivity. However, the constitutive active form of the GSK-3beta(S9A) mutant was almost totally inert to each enzyme. Incubating tau with PKNalpha increased the GSK-3beta-induced AT180 immunoreactivity, which was further enhanced when the S9A mutant was used instead of the wild type GSK-3beta. These results suggest that PKNalpha and PKC directly inhibit GSK-3beta activity at least in part by phosphorylating Ser9 of GSK-3beta, and that they indirectly suppress GSK-3beta-stimulated phosphorylation of tau at amino acids Ser202/Thr205 and Thr181, but enhanced phosphorylation at Thr231 through phosphorylation at other sites of tau." @default.
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- W2021736150 date "2000-06-01" @default.
- W2021736150 modified "2023-10-15" @default.
- W2021736150 title "Dual Effects of PKNα and Protein Kinase C on Phosphorylation of Tau Protein by Glycogen Synthase Kinase-3β" @default.
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- W2021736150 doi "https://doi.org/10.1006/bbrc.2000.2926" @default.
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