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• W2009145128 abstract "Studies of metabolism of the Alzheimer amyloid precursor protein (APP) have focused much recent attention on the biology of juxta- and intra-membranous proteases. Release or 'shedding' of the large APP ectodomain can occur via one of two competing pathways, the alpha- and beta-secretase pathways, that are distinguished both by subcellular site of proteolysis and by site of cleavage within APP. The alpha-secretase pathway cleaves within the amyloidogenic Abeta domain of APP, precluding the formation of toxic amyloid aggregates. The relative utilization of the alpha- and beta-secretase pathways is controlled by the activation of certain protein phosphorylation signal transduction pathways including protein kinase C (PKC) and extracellular signal regulated protein kinase [ERK/mitogen-activated protein kinase (MAP kinase)], although the relevant substrates for phosphorylation remain obscure. Because of their apparent ability to decrease the risk for Alzheimer disease, the effects of statins (HMG CoA reductase inhibitors) on APP metabolism were studied. Statin treatment induced an APP processing phenocopy of PKC or ERK activation, raising the possibility that statin effects on APP processing might involve protein phosphorylation. In cultured neuroblastoma cells transfected with human Swedish mutant APP, atorvastatin stimulated the release of alpha-secretase-released, soluble APP (sAPPalpha). However, statin-induced stimulation of sAPPalpha release was not antagonized by inhibitors of either PKC or ERK, or by the co-expression of a dominant negative isoform of ERK (dnERK), indicating that PKC and ERK do not play key roles in mediating the effect of atorvastatin on sAPPalpha secretion. These results suggest that statins may regulate alpha-secretase activity either by altering the biophysical properties of plasma membranes or by modulating the function of as-yet unidentified protein kinases that respond to either cholesterol or to some intermediate in the cholesterol metabolic pathway. A 'phospho-proteomic' analysis of N2a cells with and without statin treatment was performed, revealing changes in the phosphorylation state of several protein kinases plausibly related to APP processing. A systematic evaluation of the possible role of these protein kinases in statin-regulated APP ectodomain shedding is underway." @default.
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• W2009145128 date "2004-07-15" @default.
• W2009145128 modified "2023-10-10" @default.
• W2009145128 title "Atorvastatin-induced activation of Alzheimer's alpha secretase is resistant to standard inhibitors of protein phosphorylation-regulated ectodomain shedding" @default.
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• W2009145128 doi "https://doi.org/10.1111/j.1471-4159.2004.02521.x" @default.
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