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• W2984270613 abstract "Neurofibrillary tangles, a pathological hallmark of Alzheimer's disease (AD), are somatodendritic filamentous inclusions composed of hyperphosphorylated tau. Microtubule loss is also a common feature of affected neurons in AD. However, whether and how the disruptions of microtubules and the microtubule-associated proteins occur in the pathogenesis of AD remain unclear. Recent evidence indicates that reduced expression of tubulin by knocking down a tubulin chaperon can cause tau neurotoxicity. Thus, the disruption of tubulin homeostasis may result in the acquisition of tau pathogenesis and ultimately cause tauopathy. To investigate whether the disruption of tubulin maintenance induces tau abnormalities in mammalian neurons, we developed a miRNA-mediated knockdown system of tubulin-specific chaperon E (Tbce), which is a factor required for the de novo synthesis of tubulin. Tbce knockdown in mouse primary cultured neurons induced an increase in tubulin in the cell body at 14 days in vitro. Accumulated tubulin was not acetylated or incorporated in microtubules, indicating that they were functionally inert. Concomitantly, tau also accumulated in neuronal cell bodies. The mis-localized tau was phosphorylated at Ser202/Thr205 and Ser396/Ser404. These results indicate that Tbce knockdown in mammalian neurons induces not only a reduction in properly folded tubulins, which are microtubule assembly competent, but also an accumulation of phosphorylated tau in the cell body of mammalian neurons. These findings suggest that disruption of the homeostatic mechanism for maintaining tubulin biosynthesis and/or microtubules can cause tau accumulation in the cell body, which is commonly observed in tauopathies." @default.
• W2984270613 created "2019-11-22" @default.
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• W2984270613 date "2020-01-01" @default.
• W2984270613 modified "2023-09-24" @default.
• W2984270613 title "Inhibition of microtubule assembly competent tubulin synthesis leads to accumulation of phosphorylated tau in neuronal cell bodies" @default.
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• W2984270613 doi "https://doi.org/10.1016/j.bbrc.2019.10.191" @default.
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