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Syk inhibitor reduces oligomeric tau associated with GSK3β inactivation and autophagy activation

Neurofibrillary tangle (NFT), composed of highly phosphorylated tau is one of the pathological hallmarks of Alzheimer’s disease (AD). Spleen tyrosine kinase (Syk) is non receptor type tyrosine kinase, and has various physiological functions, including histamine release in mast cells, phagocytosis in macrophage, and B cell differentiation. The possibility of Syk inhibitor for clinical application was proposed in allergic rhinitis, rheumatoid arthritis, and immunologic thrombocytopenia. The possible relationship between Syk and AD has been reported recently. We have examined the effects of Syk specific inhibitor BAY61‐3606 on phosphorylation levels of tau protein and oligomeric tau by using cell culture model of tauopathy, M1C cells.