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The accumulation of alpha-synuclein (αS) inclusions is a hallmark feature of Parkinson's disease (PD) and PD-related diseases. Recently, a number of studies have demonstrated similarities between the prion protein and αS, including its ability to spread along neuroanatomical tracts throughout the central nervous system (CNS). However, there are caveats in each of these studies in which the injection routes used had the potential to result in a widespread dissemination of the αS-containing inocula, making it difficult to precisely define the mechanisms of spread. In this study, we assessed the spread of pathology following a localized induction of αS inclusions in the lumbar spinal cord following a unilateral injection in the sciatic nerve. Using this paradigm, we demonstrated the ability for αS inclusion spread and/or induction along neuroanatomical tracts within the CNS of two αS-overexpressing mouse models.

Localized Induction of Wild-Type and Mutant Alpha-Synuclein Aggregation Reveals Propagation along Neuroanatomical Tracts