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GM1 Ganglioside Inhibits β-Amyloid Oligomerization Induced by Sphingomyelin
Mariana Amaro1, Radek Šachl2, Gokcan Aydogan2
1J. Heyrovský Inst. Physical Chemistry of the A.S.C.R. v.v.i., Prague, Czech Republic. amaro@jh-inst.cas.cz.
Abstract:
β-Amyloid (Aβ) oligomers are neurotoxic and implicated in Alzheimer's disease. Neuronal plasma membranes may mediate formation of Aβ oligomers in vivo. Membrane components sphingomyelin and GM1 have been shown to promote aggregation of Aβ; however, these studies were performed under extreme, non-physiological conditions. We demonstrate that physiological levels of GM1 , organized in nanodomains do not seed oligomerization of Aβ40 monomers. We show that sphingomyelin triggers oligomerization of Aβ40 and that GM1 is counteractive thus preventing oligomerization. We propose a molecular explanation that is supported by all-atom molecular dynamics simulations. The preventive role of GM1 in the oligomerization of Aβ40 suggests that decreasing levels of GM1 in the brain, for example, due to aging, could reduce protection against Aβ oligomerization and contribute to the onset of Alzheimer's disease.
Insights
Sphingomyelin promotes beta-amyloid (Aβ) oligomerization, a key factor in Alzheimer's disease. However, GM1 ganglioside prevents this aggregation, suggesting reduced GM1 levels may increase Alzheimer's risk.
Area of Science:
- Neuroscience
- Biochemistry
- Molecular Biology
Background:
- Beta-amyloid (Aβ) oligomers are neurotoxic and linked to Alzheimer's disease pathogenesis.
- Neuronal plasma membranes and their components, like sphingomyelin and GM1 ganglioside, are hypothesized to mediate Aβ oligomer formation in vivo.
- Previous studies on Aβ aggregation by membrane components were conducted under non-physiological conditions.
Purpose of the Study:
- To investigate the role of physiological levels of GM1 ganglioside and sphingomyelin in the oligomerization of Aβ40 monomers.
- To elucidate the molecular mechanisms underlying Aβ40 aggregation and the influence of membrane lipids.
Main Methods:
- All-atom molecular dynamics simulations were employed to model interactions between Aβ40 and membrane lipids.
- Experiments were conducted under physiological conditions to assess Aβ40 aggregation.
Main Results:
- Physiological levels of GM1 ganglioside, organized in nanodomains, do not initiate Aβ40 monomer oligomerization.
- Sphingomyelin was found to trigger Aβ40 oligomerization.
- GM1 ganglioside demonstrated a counteractive effect, preventing Aβ40 oligomerization induced by sphingomyelin.
Conclusions:
- GM1 ganglioside plays a preventive role in Aβ40 oligomerization.
- Decreased levels of GM1 ganglioside, potentially due to aging, may reduce protection against Aβ oligomerization.
- Reduced GM1 protection could contribute to the onset and progression of Alzheimer's disease.
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