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Cell Mol Neurobiol. 2018 Nov;38(8):1539-1550. doi: 10.1007/s10571-018-0622-5. Epub 2018 Oct 4.

Secretion and Uptake of α-Synuclein Via Extracellular Vesicles in Cultured Cells.

Author information

1
Department of Public Health and Caring Sciences/Geriatrics, Uppsala University, Uppsala, Sweden.
2
Department of Neurology, Massachusetts General Hospital, Charlestown, USA.
3
Neuroscience Program, Harvard Medical School, Boston, USA.
4
Department of Experimental Neurodegeneration, University Medical Center Göttingen, Göttingen, Germany.
5
Department of Radiology, Massachusetts General Hospital, Charlestown, USA.
6
Department of Pathology, Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden.
7
Max Planck Institute for Experimental Medicine, Göttingen, Germany.
8
Institute of Neuroscience, The Medical School, Newcastle University, Framlington Place, Newcastle Upon Tyne, NE2 4HH, UK.
9
Department of Public Health and Caring Sciences/Geriatrics, Uppsala University, Uppsala, Sweden. martin.ingelsson@pubcare.uu.se.
10
Department of Neurology, Massachusetts General Hospital, Charlestown, USA. martin.ingelsson@pubcare.uu.se.
11
Department of Radiology, Massachusetts General Hospital, Charlestown, USA. martin.ingelsson@pubcare.uu.se.
12
Neuroscience Program, Harvard Medical School, Boston, USA. martin.ingelsson@pubcare.uu.se.

Abstract

In Parkinson's disease and other Lewy body disorders, the propagation of pathology has been accredited to the spreading of extracellular α-synuclein (α-syn). Although the pathogenic mechanisms are not fully understood, cell-to-cell transfer of α-syn via exosomes and other extracellular vesicles (EVs) has been reported. Here, we investigated whether altered molecular properties of α-syn can influence the distribution and secretion of α-syn in human neuroblastoma cells. Different α-syn variants, including α-syn:hemi-Venus and disease-causing mutants, were overexpressed and EVs were isolated from the conditioned medium. Of the secreted α-syn, 0.1-2% was associated with vesicles. The major part of EV α-syn was attached to the outer membrane of vesicles, whereas a smaller fraction was found in their lumen. For α-syn expressed with N-terminal hemi-Venus, the relative levels associated with EVs were higher than for WT α-syn. Moreover, such EV-associated α-syn:hemi-Venus species were internalized in recipient cells to a higher degree than the corresponding free-floating forms. Among the disease-causing mutants, A53T α-syn displayed an increased association with EVs. Taken together, our data suggest that α-syn species with presumably lost physiological functions or altered aggregation properties may shift the cellular processing towards vesicular secretion. Our findings thus lend further support to the tenet that EVs can mediate spreading of harmful α-syn species and thereby contribute to the pathology in α-synucleinopathies.

KEYWORDS:

Alpha-synuclein; Alpha-synuclein oligomers; Exosomes; Extracellular vesicles; Human neuroblastoma; Parkinson’s disease

PMID:
30288631
PMCID:
PMC6223723
DOI:
10.1007/s10571-018-0622-5
[Indexed for MEDLINE]
Free PMC Article

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