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Human Astrocytes Transfer Aggregated Alpha-Synuclein via Tunneling Nanotubes
Open accessAbstract
Many lines of evidence suggest that the Parkinson's disease (PD)-related protein α-synuclein (α-SYN) can propagate from cell to cell in a prion-like manner. However, the cellular mechanisms behind the spreading remain elusive. Here, we show that human astrocytes derived from embryonic stem cells actively transfer aggregated α-SYN to nearby astrocytes via direct contact and tunneling nanotubes (TNTs). Failure in the astrocytes' lysosomal digestion of excess α-SYN oligomers results in α-SYN deposits in the trans-Golgi network followed by endoplasmic reticulum swelling and mitochondrial disturbances. The stressed astrocytes respond by conspicuously sending out TNTs, enabling intercellular transfer of α-SYN to healthy astrocytes, which in return deliver mitochondria, indicating a TNT-mediated rescue mechanism. Using a pharmacological approach to inhibit TNT formation, we abolished the transfer of both α-SYN and mitochondria. Together, our results highlight the role of astrocytes in α-SYN cell-to-cell transfer, identifying possible pathophysiological events in the PD brain that could be of therapeutic relevance. SIGNIFICANCE STATEMENT Astrocytes are the major cell type in the brain, yet their role in Parkinson's disease progression remains elusive. Here, we show that human astrocytes actively transfer aggregated α-synuclein (α-SYN) to healthy astrocytes via direct contact and tunneling nanotubes (TNTs), rather than degrade it. The astrocytes engulf large amounts of oligomeric α-SYN that are subsequently stored in the trans-Golgi network region. The accumulation of α-SYN in the astrocytes affects their lysosomal machinery and induces mitochondrial damage. The stressed astrocytes respond by sending out TNTs, enabling intercellular transfer of α-SYN to healthy astrocytes. Our findings highlight an unexpected role of astrocytes in the propagation of α-SYN pathology via TNTs, revealing astrocytes as a potential target for therapeutic intervention.
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“In the AD and PD brain, both astrocytes and microglia acquire reactive, inflammatory phenotypes and can effectively phagocytose aggregated proteins and cell debris, as well as secrete various cytokines and inflammatory mediators [8–13].”
From Crosstalk between astrocytes and microglia results in increased degradation of α-synuclein and amyloid-β aggregates (2021) · cites this paper as [11]
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“Subsequently, stressed astrocytes respond by sending out tunneling nanotubes (TNTs), enabling intercellular transfer of pathogenic protein aggregates, as well as MHCII complexes to nearby cells [11, 24].”
From Crosstalk between astrocytes and microglia results in increased degradation of α-synuclein and amyloid-β aggregates (2021) · cites this paper as [11]
Experimental — accuracy not yet measuredThe source backs part of the claim, not all of it — or backs it for a different population, condition or comparison.
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“The concentrations were selected based on our previous studies [11, 12, 23, 28, 29].”
From Crosstalk between astrocytes and microglia results in increased degradation of α-synuclein and amyloid-β aggregates (2021) · cites this paper as [11]
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“The αSYN and Aβ accumulation result in severe cellular stress, indicated by lysosomal and mitochondrial deficiencies [11, 12, 23].”
From Crosstalk between astrocytes and microglia results in increased degradation of α-synuclein and amyloid-β aggregates (2021) · cites this paper as [11]
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“These observations are in line with our previous discoveries that astrocytes easily degrade αSYN and Aβ monomers, while they accumulate larger oligomers and fibrils [11, 12].”
From Crosstalk between astrocytes and microglia results in increased degradation of α-synuclein and amyloid-β aggregates (2021) · cites this paper as [11]
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“Our previous results indicate that astrocytes are capable of transferring αSYN as well as MHCII to other astrocytes via direct membrane contact and through TNTs, implicating astrocytes as one of the important players in propagation of αSYN pathology [11, 24].”
From Crosstalk between astrocytes and microglia results in increased degradation of α-synuclein and amyloid-β aggregates (2021) · cites this paper as [11]
Experimental — accuracy not yet measuredThe source backs part of the claim, not all of it — or backs it for a different population, condition or comparison.
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“Microglia and astrocytes are known to be responsible for many inflammatory processes in affected brains, including phagocytosis of αSYN and Aβ aggregates, secretion of inflammatory mediators, and stimulation of the innate immune system [8–12].”
From Crosstalk between astrocytes and microglia results in increased degradation of α-synuclein and amyloid-β aggregates (2021) · cites this paper as [11]
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“We have previously shown that astrocytes accumulate large amounts of αSYN and Aβ aggregates, resulting in severe cellular stress [11, 12, 23, 24].”
From Crosstalk between astrocytes and microglia results in increased degradation of α-synuclein and amyloid-β aggregates (2021) · cites this paper as [11]
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“We have previously reported that cultured astrocytes accumulate αSYN and Aβ aggregates but not the monomeric form of the proteins [11, 12].”
From Crosstalk between astrocytes and microglia results in increased degradation of α-synuclein and amyloid-β aggregates (2021) · cites this paper as [11]
In the citing paper
“iii) αSyn has the ability to spread to adjacent cells via secretion in exosomes [209], uptake via endocytosis [210] and cell-surface receptors like HSPGs, or even direct neuron-to-neuron [211, 212] or astrocyte-to-neuron [213] transfer via tunneling nanotubes (Fig. 2).”
From α-synuclein in the pathophysiology of Alzheimer’s disease (2019) · cites this paper as [213]
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Metadata
- Authors
- Rostami, J., Holmqvist, S., Lindström, V., Sigvardson, J., Westermark, G. T., Ingelsson, M., Bergström, J., Roybon, L., & Erlandsson, A.
- Affiliations
- Uppsala University (SE)
- Lund University (SE)
- Corresponding author
- Erlandsson, Anna
- ORCID
- Venue
- The Journal of Neuroscience
- Publisher
- Society for Neuroscience
- Published
- 2017-10-31
- Volume
- 37
- Issue
- 49
- Pages
- 11835-11853
- ISSN
- 0270-6474 (ISSN-L)
- 1529-2401
- PMC
- PMC5719970
- OpenAlex
- W2765364382
- Cited by
- 339
- References
- 75
- Citations by year
- 2026: 45 · 2025: 30 · 2024: 64 · 2023: 47 · 2022: 34 · 2021: 38 · 2020: 26 · 2019: 31 · 2018: 24
- FWCI
- 15.43
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Locations
- Journal of Neuroscience (publishedVersion, cc-by)
- Europe PMC (PubMed Central) (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- Uppsala University Publications (Uppsala University) (submittedVersion, other-oa)
- Lund University Publications (Lund University) (submittedVersion)
- Apollo (University of Cambridge) (submittedVersion, cc-by)
- Apollo (cc-by)
- Funders
- Åke Wiberg Stiftelse
- Innovationsfonden
- Vetenskapsrådet
- Topics
- Health Sciences › Medicine › Clinical Neurology › Parkinson's Disease Mechanisms and Treatments
- Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Alzheimer's disease research and treatments
- Keywords
- alpha-synuclein, Parkinson's disease, tunneling nanotubes, astrocytes, prion-like propagation, intercellular transfer, lysosomal degradation, trans-Golgi network, mitochondrial damage, endoplasmic reticulum stress, mitochondrial transfer
- MeSH terms
- Astrocytes, Cell Communication, Cells, Cultured, Humans, Nanotubes, alpha-Synuclein, Embryonic Stem Cells
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