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The regulation of the activity of CaMKII by PP-1 and PP-2A, as well as the role of this protein kinase in the phosphorylation of tau protein in forebrain were investigated. The treatment of metabolically active rat brain slices with 1.0 μM okadaic acid (OA) inhibited ~65% of PP-2A and had no significant effect on PP-1 in the 16 000xg tissue extract. Calyculin A (CL-A), 0.1 μM under the same conditions,...
In Alzheimer disease brain the activities of protein phosphatase (PP)-2A and PP-1 are decreased and the microtubule-associated protein tau is abnormally hyperphosphorylated at several sites at serine/threonine. Employing rat forebrain slices kept metabolically active in oxygenated artificial CSF as a model system, we investigated the role of PP-2A/PP-1 in the regulation of some of the major abnormally...
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