Neuropathology of α-synuclein propagation and braak hypothesis

Movement Disorders : Official Journal of the Movement Disorder Society
Heather McCannGlenda M Halliday

Abstract

Parkinson's disease is a progressive neurodegenerative disorder with multiple factors contributing to increasing severity of pathology in specific brain regions. The Braak hypothesis of Lewy pathology progression in Parkinson's disease proposes a systematic spread of α-synuclein that can be staged, with the later stages correlating with clinical aspects of the disease. The spread of pathology through the different stages suggests progression, a theory that has proven correct from evidence of pathology in healthy neurons grafted into the brains of patients with Parkinson's disease. Progression of pathology occurs on a number of levels, within a cell, between nearby cells, and then over longer distances throughout the brain, and evidence using prion proteins suggests two dissociable mechanisms-intracellular toxicity versus a nontoxic infectious mechanism for propagation. In Parkinson's disease, intracellular changes associated with mitochondria and lysosome dysfunction appear important for α-synuclein propagation, with high stress conditions favoring mitochondrial cell death mechanisms. Functional neurons appear necessary for propagation. Unconventional exocytosis releases α-synuclein under stress conditions, and endocytic uptake...Continue Reading

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