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• W2019968489 abstract "In Alzheimer's disease there is abnormal brain copper distribution, with accumulation of copper in amyloid plaques and a deficiency of copper in neighbouring cells. Excess copper inhibits Aβ (amyloid β-peptide) production, but the effects of deficiency have not yet been determined. We therefore studied the effects of modulating intracellular copper levels on the processing of APP (amyloid precursor protein) and the production of Aβ. Human fibroblasts genetically disposed to copper accumulation secreted higher levels of sAPP (soluble APP ectodomain)α into their medium, whereas fibroblasts genetically manipulated to be profoundly copper deficient secreted predominantly sAPPβ and produced more amyloidogenic β-cleaved APP C-termini (C99). The level of Aβ secreted from copper-deficient fibroblasts was however regulated and limited by α-secretase cleavage. APP can be processed by both α- and β-secretase, as copper-deficient fibroblasts secreted sAPPβ exclusively, but produced primarily α-cleaved APP C-terminal fragments (C83). Copper deficiency also markedly reduced the steady-state level of APP mRNA whereas the APP protein level remained constant, indicating that copper deficiency may accelerate APP translation. Copper deficiency in human neuroblastoma cells significantly increased the level of Aβ secretion, but did not affect the cleavage of APP. Therefore copper deficiency markedly alters APP metabolism and can elevate Aβ secretion by either influencing APP cleavage or by inhibiting its degradation, with the mechanism dependent on cell type. Overall our results suggest that correcting brain copper imbalance represents a relevant therapeutic target for Alzheimer's disease." @default.
• W2019968489 created "2016-06-24" @default.
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• W2019968489 date "2008-04-25" @default.
• W2019968489 modified "2023-09-26" @default.
• W2019968489 title "Intracellular copper deficiency increases amyloid-β secretion by diverse mechanisms" @default.
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• W2019968489 doi "https://doi.org/10.1042/bj20080103" @default.
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