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• W2786397146 abstract "Urea cycle enzymes may play important yet poorly characterized roles in Alzheimer’s disease (AD). Our previous results showed that amyloid-β (Aβ) affects urea cycle enzymes in rat pheochromocytoma (PC12) cells. The aim of the present study was to investigate the changes in arginases, other urea cyc le enzymes, and nitric oxide synthases (NOSs) in PC12 cells transfected with AβPP bearing the double ‘Swedish’ mutation (APPsw, K670M/N671L) and in postmortem sporadic AD brain hippocampus; the mutation intensifies Aβ production and strongly associates with AD neuropathology. mRNA expression was analyzed using real-time PCR in cell cultures and DNA microarrays in hippocampal CA1 area of human AD brains. Arginase activity was measured spectrophotometrically, and arginine, ornithine, and citrulline levels by high-performance liquid chromatography. Our data demonstrated that the expression and activity of arginases (Arg1 and Arg2), as well as the expression of argininosuccinate synthase (Ass) were significantly reduced in APPsw cells compared to control. However, argininosuccinate lyase (Asl) was upregulated in APPsw cells. Real-time PCR analysis revealed significant elevation of neuronal nitric oxide synthase (Nnos) mRNA in APPsw cells, without changes in the endothelial Enos, whereas inducible Inos was undetectable. The changes were found to follow closely those observed in the human hippocampal CA1 region of sporadic AD brains. The changes in enzyme expression were accompanied in APPsw cells by significantly elevated citrulline, ornithine, and arginine. Our findings demonstrate that AβPP/Aβ alters arginine metabolism and induces a shift of cellular homeostasis that may support the oxidative/nitrosative stress observed in AD." @default.
• W2786397146 created "2018-02-23" @default.
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• W2786397146 date "2018-02-06" @default.
• W2786397146 modified "2023-10-02" @default.
• W2786397146 title "Altered Expression of Urea Cycle Enzymes in Amyloid-β Protein Precursor Overexpressing PC12 Cells and in Sporadic Alzheimer’s Disease Brain" @default.
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• W2786397146 doi "https://doi.org/10.3233/jad-170427" @default.
• W2786397146 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29439324" @default.
• W2786397146 hasPublicationYear "2018" @default.
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