The amyloid precursor protein of Alzheimer's disease in the reduction of copper(II) to copper(I).
Multhaup. G G; Schlicksupp. A A; Hesse. L L; Beher. D D; Ruppert. T T; Masters. C L CL; Beyreuther. K K
Key Findings
- A segment of the amyloid precursor protein (APP) can reduce copper(II) to copper(I).
- The reduction triggers disulfide bond formation in APP, indicating involvement of its sulfhydryl groups.
- The process can boost hydroxyl radical production, potentially contributing to neurodegeneration.
Practical Outcomes
- For biohackers, the main takeaway is that excess copper or copper‑binding peptides could theoretically promote harmful oxidative reactions in the brain. There are no direct dosage or protocol recommendations from this study, but it suggests caution with high‑dose copper supplementation, especially in people concerned about Alzheimer's risk.
Summary
The study shows that a part of the Alzheimer's protein can turn copper from its +2 form to the more reactive +1 form, which then creates harmful radicals that might damage brain cells. This reaction happens on its own, without needing other chemicals like superoxide or hydrogen peroxide.
Abstract
The transition metal ion copper(II) has a critical role in chronic neurologic diseases. The amyloid precursor protein (APP) of Alzheimer's disease or a synthetic peptide representing its copper-binding site reduced bound copper(II) to copper(I). This copper ion-mediated redox reaction led to disulfide bond formation in APP, which indicated that free sulfhydryl groups of APP were involved. Neither superoxide nor hydrogen peroxide had an effect on the kinetics of copper(II) reduction. The reduction of copper(II) to copper(I) by APP involves an electron-transfer reaction and could enhance the production of hydroxyl radicals, which could then attack nearby sites. Thus, copper-mediated toxicity may contribute to neurodegeneration in Alzheimer's disease.
Study Information
pubmed
1996
1996-03-08T00:00:00.000Z
10.1126/science.271.5254.1406
668
64