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Considerable evidence points to oxidative stress in the brain as an important event in the early stages of Alzheimer's disease (AD).  The transition metal ions of Cu, Fe, and Zn are all enriched in the amyloid cores of senile plaques in AD.  Those of Cu and Fe are redox active and bind to Aβ in vitro. When bound, they can facilitate the reduction of oxygen to hydrogen peroxide, and of the latter to the hydroxyl radical.  This radical is very aggressive and can cause considerable oxidative damage.  Recent research favours the involvement of small, soluble oligomers as the aggregating species responsible for Aβ neurotoxicity. We propose that the generation of reactive oxygen species (i.e., hydrogen peroxide and hydroxyl radicals) by these oligomers, in association with redox-active metal ions, is a key molecular mechanism underlying the pathogenesis of AD and some other neurodegenerative disorders

international journal of alzheimer's disease

Hypothesis: Soluble A<i>β</i>Oligomers in Association with Redox-Active Metal Ions Are the Optimal Generators of Reactive Oxygen Species in Alzheimer's Disease

Hypothesis: Soluble AβOligomers in Association with Redox-Active Metal Ions Are the Optimal Generators of Reactive Oxygen Species in Alzheimer's Disease