Tau is a microtubule binding protein that promotes microtubule assembly and stability. Tau is found to be the major component of the paired helical filaments (PHFs) found in the brains of patients with Alzheimer disease (AD) (1,2). Tau is hyperphosphorylated in PHFs, and specific phosphorylation sites have been implicated in the loss of Taus association with the membrane cortex during AD disease state, including Serine 199/202, Threonine 231, and Serine 393/404 (3). Glycogen synthase kinase-3, or GSK-3, phosphorylates Tau on Serine 396 (4).
MAPK signaling pathway
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