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• W2973409872 abstract "Abstract Increasing evidence suggests that the process of alpha-synuclein (aSyn) aggregation from monomers into amyloid fibrils via oligomeric intermediates plays an essential role in the pathogenesis of different synucleinopathies, including Parkinson’s disease (PD), multiple system atrophy and dementia with Lewy bodies. However, the nature of the toxic species and the mechanisms by which they contribute to neurotoxicity and disease progression remain elusive. Over the past two decades, significant efforts and resources have been invested in studies aimed at identifying the putative toxic species along the pathway of aSyn fibrillization, and to develop small molecule drugs or antibodies that target toxic aSyn oligomeric intermediates. Although this approach has helped to advance the field and provide insights into the biological properties and toxicity of different aSyn species, many of the fundamental questions regarding the role of aSyn aggregation in PD remain unanswered, and no therapeutic compounds targeting aSyn oligomers have passed clinical trials. Several factors have contributed to this slow progress, including the complexity of the aggregation pathways and the heterogeneity and dynamic nature of aSyn aggregates. In the majority of experiment, the aSyn samples used contain mixtures of aSyn species that exist in an equilibrium and their ratio changes upon modifying experimental conditions. The failure to quantitatively account for the distribution of different aSyn species in different studies has contributed not only to experimental irreproducibility but also to misinterpretation of results and misdirection of valuable resources. Towards addressing these challenges and improving experimental reproducibility in Parkinson’s research, we describe here a simple centrifugation-based filtration protocol for the isolation, quantification and assessment of the distribution of of aSyn monomers, oligomers and fibrils, in heterogeneous aSyn samples of increasing complexity. The protocol is simple, does not require any special instrumentation and can be performed rapidly on multiple samples using small volumes. Here, we present and discuss several examples that illustrate the applications of this protocol and how it could contribute to improving the reproducibility of experiments aimed at elucidating the structural basis of aSyn aggregation, seeding activity, toxicity and pathology spreading. This protocol is applicable, with slight modifications, to other amyloid-forming proteins. Table of Content Figure" @default.
• W2973409872 created "2019-09-26" @default.
• W2973409872 creator A5021864353 @default.
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• W2973409872 creator A5086170675 @default.
• W2973409872 date "2019-09-21" @default.
• W2973409872 modified "2023-09-24" @default.
• W2973409872 title "A simple, versatile and robust centrifugation-based filtration protocol for the isolation and quantification of α-synuclein monomers, oligomers and fibrils: towards improving experimental reproducibility in α-synuclein research" @default.
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• W2973409872 doi "https://doi.org/10.1101/772160" @default.
• W2973409872 hasPublicationYear "2019" @default.
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