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- W1645139068 abstract "Mutations in the presenilin 1 (PS1) gene are the most common genetic factor underlying the development of early onset familial Alzheimer's disease (FAD). Accumulating evidence has shown that FAD-linked mutations of PS1 enhance the generation of amyloid-beta (1-42) protein. Recently, beta-catenin has been shown to interact with PS1. beta-catenin is essential for the Wnt signalling pathway. However, the biological significance of the interaction between beta-catenin and PS1 in this signalling pathway remains to be clarified. In this study, we investigated the effect of FAD-linked PS1 (M146L) mutation in the Wnt signalling pathway using the conditioned medium containing Wnt-3A. The expression of mutated PS1 inhibited the Wnt-3A-induced accumulation of beta-catenin. Chase analysis of beta-catenin in Wnt-3A-stimulated cells following cycloheximide treatment revealed that PS1 mutation enhanced the generation of the higher molecular mass form of beta-catenin, most likely, ubiquitinated beta-catenin. In addition, the expression of mutated PS1 elevated the level of phosphorylated beta-catenin, which is targeted to the ubiquitin/proteasome pathway. Thus, it appears that PS1 (M146L) mutation down-regulates the Wnt-3A-induced accumulation of beta-catenin due to an increase in the level of phosphorylated beta-catenin." @default.
- W1645139068 created "2016-06-24" @default.
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- W1645139068 date "2001-05-15" @default.
- W1645139068 modified "2023-10-15" @default.
- W1645139068 title "Inhibitory effect of a presenilin 1 mutation on the Wnt signalling pathway by enhancement of β-catenin phosphorylation" @default.
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- W1645139068 doi "https://doi.org/10.1046/j.1432-1327.2001.02197.x" @default.
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