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Hydrogen peroxide is generated during the very early stages of aggregation of the amyloid peptides implicated in Alzheimer's disease and familial British dementia.

Tabner, Brian J. and El-Agnaf, Omar M. A. and Turnbull, Stuart and German, Matthew J. and Paleologou, Katerina E. and Hayashi, Yoshihito and Cooper, Leanne J. and Fullwood, Nigel and Allsop, David (2005) Hydrogen peroxide is generated during the very early stages of aggregation of the amyloid peptides implicated in Alzheimer's disease and familial British dementia. Journal of Biological Chemistry, 280 (43). pp. 35789-35792. ISSN 1083-351X

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Abstract

Alzheimer disease and familial British dementia are neurodegenerative diseases that are characterized by the presence of numerous amyloid plaques in the brain. These lesions contain fibrillar deposits of the -amyloid peptide (A) and the British dementia peptide (ABri), respectively. Both peptides are toxic to cells in culture, and there is increasing evidence that early "soluble oligomers" are the toxic entity rather than mature amyloid fibrils. The molecular mechanisms responsible for this toxicity are not clear, but in the case of A, one prominent hypothesis is that the peptide can induce oxidative damage via the formation of hydrogen peroxide. We have developed a reliable method, employing electron spin resonance spectroscopy in conjunction with the spin-trapping technique, to detect any hydrogen peroxide generated during the incubation of A and other amyloidogenic peptides. Here, we monitored levels of hydrogen peroxide accumulation during different stages of aggregation of A-(1–40) and ABri and found that in both cases it was generated as a short "burst" early on in the aggregation process. Ultrastructural studies with both peptides revealed that structures resembling "soluble oligomers" or "protofibrils" were present during this early phase of hydrogen peroxide formation. Mature amyloid fibrils derived from A-(1–40) did not generate hydrogen peroxide. We conclude that hydrogen peroxide formation during the early stages of protein aggregation may be a common mechanism of cell death in these (and possibly other) neurodegenerative diseases.

Item Type: Article
Journal or Publication Title: Journal of Biological Chemistry
Subjects: Q Science > QH Natural history > QH301 Biology
Departments: Faculty of Science and Technology > Lancaster Environment Centre
Faculty of Health and Medicine > Health Research
Faculty of Health and Medicine > Biomedical & Life Sciences
ID Code: 8841
Deposited By: Prof David Allsop
Deposited On: 15 May 2008 11:47
Refereed?: Yes
Published?: Published
Last Modified: 09 Apr 2014 22:14
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/8841

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