Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 55, Issue 32, Pages 9411-9415Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201603178
Keywords
Alzheimer's disease; amyloid beta-peptides; diffusion coefficients; fluorescence spectroscopy; neuroprotectives
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Funding
- GACR [P208/12/G016, 14-12598S]
- MEYS
- European Regional Development Fund [CZ.1.05/1.1.00/02.0068 CEITEC]
- CAS
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beta-Amyloid (A beta) oligomers are neurotoxic and implicated in Alzheimer's disease. Neuronal plasma membranes may mediate formation of A beta oligomers in vivo. Membrane components sphingomyelin and GM(1) have been shown to promote aggregation of A beta; however, these studies were performed under extreme, non-physiological conditions. We demonstrate that physiological levels of GM(1), organized in nanodomains do not seed oligomerization of A beta(40) monomers. We show that sphingomyelin triggers oligomerization of A beta(40) and that GM(1) is counteractive thus preventing oligomerization. We propose a molecular explanation that is supported by all-atom molecular dynamics simulations. The preventive role of GM(1) in the oligomerization of A beta(40) suggests that decreasing levels of GM(1) in the brain, for example, due to aging, could reduce protection against A beta oligomerization and contribute to the onset of Alzheimer's disease.
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