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- W2024407722 abstract "We analyzed the effect of the vacuolar H+-ATPase inhibitor bafilomycin A1 (bafA1) on the processing of β-amyloid precursor protein (βAPP). In kidney 293 cells stably transfected with the wild-type βAPP cDNA, bafA1 caused a stabilization of mature βAPP and its 10-kDa COOH-terminal fragment. Moreover, it caused a 2-3-fold increase in secretion of soluble APP and amyloid-β protein (Aβ). Interestingly, bafA1 treatment of cells transfected with a mutant βAPP isoform that occurs in a Swedish kindred with familial Alzheimer's disease resulted in a decrease of Aβ production and no increase of soluble APP secretion. Identical results were obtained when the effect of bafA1 was analyzed on fibroblasts derived from affected versus unaffected members of the Swedish family. These data demonstrate a differential effect of bafA1 on the production of Aβ derived from wild-type or Swedish mutant βAPP. Radiosequencing of Aβ derived from bafA1-treated cells expressing wild-type βAPP revealed a marked increase of Aβ peptides starting at amino acids phenylalanine 4 and valine −3 and a relative decrease of Aβ molecules beginning at the typical NH2 terminus of aspartate 1. Cells transfected with the Swedish mutation and treated with bafA1 did not produce these alternative Aβ peptides, so that bafA1 treatment resulted in a decrease of Aβ starting at aspartate 1. Our data indicate that multiple proteases are able to cleave Aβ at or near its NH2 terminus. Inhibition of the protease cleaving at aspartate 1 by bafA1 and perhaps other similar agents can result in an increase of alternatively cleaved peptides. We analyzed the effect of the vacuolar H+-ATPase inhibitor bafilomycin A1 (bafA1) on the processing of β-amyloid precursor protein (βAPP). In kidney 293 cells stably transfected with the wild-type βAPP cDNA, bafA1 caused a stabilization of mature βAPP and its 10-kDa COOH-terminal fragment. Moreover, it caused a 2-3-fold increase in secretion of soluble APP and amyloid-β protein (Aβ). Interestingly, bafA1 treatment of cells transfected with a mutant βAPP isoform that occurs in a Swedish kindred with familial Alzheimer's disease resulted in a decrease of Aβ production and no increase of soluble APP secretion. Identical results were obtained when the effect of bafA1 was analyzed on fibroblasts derived from affected versus unaffected members of the Swedish family. These data demonstrate a differential effect of bafA1 on the production of Aβ derived from wild-type or Swedish mutant βAPP. Radiosequencing of Aβ derived from bafA1-treated cells expressing wild-type βAPP revealed a marked increase of Aβ peptides starting at amino acids phenylalanine 4 and valine −3 and a relative decrease of Aβ molecules beginning at the typical NH2 terminus of aspartate 1. Cells transfected with the Swedish mutation and treated with bafA1 did not produce these alternative Aβ peptides, so that bafA1 treatment resulted in a decrease of Aβ starting at aspartate 1. Our data indicate that multiple proteases are able to cleave Aβ at or near its NH2 terminus. Inhibition of the protease cleaving at aspartate 1 by bafA1 and perhaps other similar agents can result in an increase of alternatively cleaved peptides." @default.
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- W2024407722 date "1995-03-01" @default.
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- W2024407722 title "The Vacuolar H+-ATPase Inhibitor Bafilomycin A1 Differentially Affects Proteolytic Processing of Mutant and Wild-type β-Amyloid Precursor Protein" @default.
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- W2024407722 doi "https://doi.org/10.1074/jbc.270.11.6186" @default.
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