Lysosomal exocytosis releases pathogenic α-synuclein species from neurons in synucleinopathy models

Ying Xue Xie, Nima N. Naseri, Jasmine Fels, Parinati Kharel, Yoonmi Na, Diane Lane, Jacqueline Burré and Manu Sharma ()
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Ying Xue Xie: Weill Cornell Medicine
Nima N. Naseri: University of Pennsylvania
Jasmine Fels: Weill Cornell Medicine
Parinati Kharel: Weill Cornell Medicine
Yoonmi Na: Weill Cornell Medicine
Diane Lane: Weill Cornell Medicine
Jacqueline Burré: Weill Cornell Medicine
Manu Sharma: Weill Cornell Medicine

Nature Communications, 2022, vol. 13, issue 1, 1-16

Abstract: Abstract Considerable evidence supports the release of pathogenic aggregates of the neuronal protein α-Synuclein (αSyn) into the extracellular space. While this release is proposed to instigate the neuron-to-neuron transmission and spread of αSyn pathology in synucleinopathies including Parkinson’s disease, the molecular-cellular mechanism(s) remain unclear. To study this, we generated a new mouse model to specifically immunoisolate neuronal lysosomes, and established a long-term culture model where αSyn aggregates are produced within neurons without the addition of exogenous fibrils. We show that neuronally generated pathogenic species of αSyn accumulate within neuronal lysosomes in mouse brains and primary neurons. We then find that neurons release these pathogenic αSyn species via SNARE-dependent lysosomal exocytosis. The released aggregates are non-membrane enveloped and seeding-competent. Additionally, we find that this release is dependent on neuronal activity and cytosolic Ca2+. These results propose lysosomal exocytosis as a central mechanism for the release of aggregated and degradation-resistant proteins from neurons.

Date: 2022
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DOI: 10.1038/s41467-022-32625-1

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