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Alpha-synuclein (α-syn) protein is abundantly expressed mainly within neurons, and exists in a number of different forms - monomers, tetramers, oligomers and fibrils. During disease, α-syn undergoes conformational changes to form oligomers and high molecular weight aggregates that tend to make the protein more insoluble. Abnormally aggregated α-syn is a neuropathological feature of Parkinson's disease (PD), dementia with Lewy bodies (DLB) and multiple system atrophy (MSA). Biochemical characterization and analysis of insoluble α-syn using buffers with increasing detergent strength and high-speed ultracentrifugation provides a powerful tool to determine the development of α-syn pathology associated with disease progression. This protocol describes the isolation of increasingly insoluble/aggregated α-syn from post-mortem human brain tissue. This methodology can be adapted with modifications to studies of normal and abnormal α-syn biology in transgenic animal models harbouring different α-syn mutations as well as in other neurodegenerative diseases that feature aberrant fibrillar deposits of proteins related to their respective pathologies.

Sequential Extraction of Soluble and Insoluble Alpha-Synuclein from Parkinsonian Brains