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Phosphorylation of tau protein is regulated by several kinases, especially glycogen synthase kinase 3β (GSK-3β), cyclin-dependent protein kinase 5 (cdk5) and cAMP-dependent protein kinase (PKA). Phosphorylation of tau by PKA primes it for phosphorylation by GSK-3β, but the site-specific modulation of GSK-3β-catalyzed tau phosphorylation by the prephosphorylation has not been well investigated. Here,...
The abnormal hyperphosphorylation of tau protein is one of the hallmarks of Alzheimer disease and other tauopathies; as yet the exact role of various tau kinases in this pathology is not fully understood. Here, we show that injection of isoproterenol, an activator of cAMP-dependent kinase (PKA), into rat hippocampus bilaterally results in the activation of PKA, calcium/calmodulin-dependent kinase...
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