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- W2147367612 abstract "Perturbation of lipid metabolism favours progression of Alzheimer disease, in which processing of Amyloid Precursor Protein (APP) has important implications. APP cleavage is tightly regulated by cholesterol and APP fragments regulate lipid homeostasis. Here, we investigated whether up or down regulation of full-length APP expression affected neuronal lipid metabolism. Expression of APP decreased HMG-CoA reductase (HMGCR)-mediated cholesterol biosynthesis and SREBP mRNA levels, while its down regulation had opposite effects. APP and SREBP1 co-immunoprecipitated and co-localized in the Golgi. This interaction prevented Site-2 protease-mediated processing of SREBP1, leading to inhibition of transcription of its target genes. A GXXXG motif in APP sequence was critical for regulation of HMGCR expression. In astrocytes, APP and SREBP1 did not interact nor did APP affect cholesterol biosynthesis. Neuronal expression of APP decreased both HMGCR and cholesterol 24-hydroxylase mRNA levels and consequently cholesterol turnover, leading to inhibition of neuronal activity, which was rescued by geranylgeraniol, generated in the mevalonate pathway, in both APP expressing and mevastatin treated neurons. We conclude that APP controls cholesterol turnover needed for neuronal activity." @default.
- W2147367612 created "2016-06-24" @default.
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- W2147367612 date "2013-04-01" @default.
- W2147367612 modified "2023-10-16" @default.
- W2147367612 title "Amyloid precursor protein controls cholesterol turnover needed for neuronal activity" @default.
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- W2147367612 doi "https://doi.org/10.1002/emmm.201202215" @default.
- W2147367612 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3628100" @default.