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Updated: Feb 28, 2026
09:27
Sequential Extraction of Soluble and Insoluble Alpha-Synuclein from Parkinsonian Brains
Published on: January 5, 2016
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Lipid Acyl Chain-Driven α-Synuclein Fibril Polymorphisms and Neuronal Pathologies.
Biorxiv : the Preprint Server for Biology
|February 27, 2026
Summary
Age-related changes in neuronal membranes alter alpha-synuclein (α-syn) fibril structure and pathogenicity. These modified fibrils exhibit distinct conformations and induce greater neuronal damage, linking membrane dynamics to neurodegeneration.
Area of Science:
- Neuroscience
- Biochemistry
- Molecular Biology
Background:
- Distinct alpha-synuclein (α-syn) fibril conformations are linked to synucleinopathies like Parkinson's disease (PD) and Lewy body dementia (LBD).
- Membranes are increasingly recognized as critical factors influencing α-syn fibril structure and disease phenotype.
- The impact of age-related membrane changes on α-syn fibril formation and pathogenicity is not fully understood.
Purpose of the Study:
- To investigate how age-related alterations in neuronal membrane composition and fluidity affect α-syn fibril formation.
- To determine the influence of these age-related membrane changes on the structure and pathogenicity of α-syn fibrils.
- To explore the cellular outcomes, including neuronal aggregation and inflammation, induced by membrane-associated α-syn fibrils.
Main Methods:
- Utilized complex mixture membranes mimicking normal and age-related neuronal membrane compositions.
- Grew α-syn fibrils in the presence of these distinct membrane environments.
- Analyzed fibril structures using 2D solid-state NMR (ssNMR).
- Assessed fibril-membrane interactions and cellular pathologies in neuronal models.
Main Results:
- α-syn fibrils grown with age-related membranes showed distinct 2D ssNMR spectral patterns compared to lipid-free fibrils, indicating altered rigid fibril cores.
- Fibrils formed with age-related membranes exhibited reduced association with membranes compared to those grown with normal neuronal membranes.
- Membrane-associated fibrils induced more severe neuronal pathologies than lipid-free fibrils, with variations in intraneuronal aggregation and inflammation.
Conclusions:
- Age-related changes in membrane composition significantly shape α-syn fibril structure and pathogenicity.
- Distinct fibril conformations arising from membrane interactions contribute to disease phenotypes in synucleinopathies.
- These findings highlight the crucial role of membrane dynamics in amyloid-driven neurodegeneration and offer insights into disease mechanisms.
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