| First Author | Xie YX | Year | 2022 |
| Journal | Nat Commun | Volume | 13 |
| Issue | 1 | Pages | 4918 |
| PubMed ID | 35995799 | Mgi Jnum | J:346552 |
| Mgi Id | MGI:7332178 | Doi | 10.1038/s41467-022-32625-1 |
| Citation | Xie YX, et al. (2022) Lysosomal exocytosis releases pathogenic alpha-synuclein species from neurons in synucleinopathy models. Nat Commun 13(1):4918 |
| abstractText | Considerable evidence supports the release of pathogenic aggregates of the neuronal protein alpha-Synuclein (alphaSyn) into the extracellular space. While this release is proposed to instigate the neuron-to-neuron transmission and spread of alphaSyn 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 alphaSyn aggregates are produced within neurons without the addition of exogenous fibrils. We show that neuronally generated pathogenic species of alphaSyn accumulate within neuronal lysosomes in mouse brains and primary neurons. We then find that neurons release these pathogenic alphaSyn 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 Ca(2+). These results propose lysosomal exocytosis as a central mechanism for the release of aggregated and degradation-resistant proteins from neurons. |
