Journal
JOURNAL OF BIOLOGICAL CHEMISTRY
Volume 280, Issue 40, Pages 34186-34192Publisher
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
DOI: 10.1074/jbc.M501694200
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The mechanism of neurodegeneration caused by beta-amyloid in Alzheimer disease is controversial. Neuronal toxicity is exerted mostly by various species of soluble beta-amyloid oligomers that differ in their N- and C-terminal domains. However, abundant accumulation of beta-amyloid also occurs in the brains of cognitively normal elderly people, in the absence of obvious neuronal dysfunction. We postulated that neuronal toxicity depends on the molecular composition, rather than the amount, of the soluble beta-amyloid oligomers. Here we show that soluble beta-amyloid aggregates that accumulate in Alzheimer disease are different from those of normal aging in regard to the composition as well as the aggregation and toxicity properties.
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