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• W2022545540 startingPage "e57979" @default.
• W2022545540 abstract "Altered proteolysis of amyloid precursor protein is an important determinant of pathology development in Alzheimer's disease. Here, we describe the detection of two novel fragments of amyloid precursor protein in H4 neuroglioma cells undergoing apoptosis. Immunoreactivity of these 25-35 kDa fragments to two different amyloid precursor protein antibodies suggests that they contain the amyloid-β region and an epitope near the C-terminus of amyloid precursor protein. Generation of these fragments is associated with cleavage of caspase-3 and caspase-7, suggesting activation of these caspases. Studies in neurons undergoing DNA damage-induced apoptosis also showed similar results. Inclusion of caspase inhibitors prevented the generation of these novel fragments, suggesting that they are generated by a caspase-dependent mechanism. Molecular weight prediction and immunoreactivity of the fragments generated suggested that such fragments could not be generated by cleavage at any previously identified caspase, secretase, or calpain site on amyloid precursor protein. Bioinformatic analysis of the amino acid sequence of amyloid precursor protein revealed that fragments fitting the observed size and immunoreactivity could be generated by either cleavage at a novel, hitherto unidentified, caspase site or at a previously identified matrix metalloproteinase site in the extracellular domain. Proteolytic cleavage at any of these sites leads to a decrease in the generation of α-secretase cleaved secreted APP, which has both anti-apoptotic and neuroprotective properties, and thus may contribute to neurodegeneration in Alzheimer's disease." @default.
• W2022545540 created "2016-06-24" @default.
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• W2022545540 date "2013-02-28" @default.
• W2022545540 modified "2023-10-14" @default.
• W2022545540 title "Altered Processing of Amyloid Precursor Protein in Cells Undergoing Apoptosis" @default.
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• W2022545540 doi "https://doi.org/10.1371/journal.pone.0057979" @default.
• W2022545540 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3585261" @default.
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