What the study found
The study found that neurons exposed to alpha-synuclein aggregates had compromised lysosomal degradation and impaired autophagic flux, while microglia showed higher lysosomal turnover, especially through lysophagy, a process that removes damaged lysosomes. The authors report that this imbalance helps drive transfer of the aggregates from neurons to microglia through tunneling nanotubes, which are thin cell connections that allow cargo exchange.
Why the authors say this matters
The authors conclude that dysfunctional autophagy in neurons is a key driver of outsourcing alpha-synuclein aggregates to microglia. The findings indicate that this cell-to-cell transfer may depend on how well neurons clear aggregates and how effectively microglia can degrade what they receive.
What the researchers tested
The researchers used human neuronal and microglial cell lines, and also tested human induced pluripotent stem cell-derived neurons and microglia, to examine how alpha-synuclein aggregates are handled after exposure. They assessed lysosomal processing, autophagic flux, lysophagy, and tunneling nanotube-mediated transfer between neurons and microglia, including the effect of autophagy inhibition.
What worked and what didn't
Microglia showed higher lysosomal turnover and efficient degradation of transferred aggregates, while neuronal cells showed reduced degradative capacity and impaired autophagic flux after alpha-synuclein exposure. When aggregate clearance was further disrupted by autophagy inhibition, transfer from neurons to microglia through tunneling nanotubes increased.
What to keep in mind
The summary describes cell-based experiments, so the findings are limited to the systems tested in the abstract. The abstract does not provide detailed limitations, quantitative results, or in vivo evidence.
Key points
- Neurons exposed to alpha-synuclein aggregates showed impaired lysosomal degradation and autophagic flux.
- Microglia had higher lysosomal turnover, including lysophagy.
- Autophagy inhibition increased tunneling nanotube-mediated transfer of alpha-synuclein from neurons to microglia.
- Human iPSC-derived neurons and microglia showed a similar response pattern.
- The authors describe dysfunctional neuronal autophagy as a driver of aggregate transfer.
Disclosure
- Research title:
- Neuronal autophagy failure promotes alpha-synuclein transfer to microglia
- Authors:
- Ranabir Chakraborty, Francesca Palese, Philippa Samella, Veronica Testa, Jara Montero-Muñoz, Sylvie Syan, Takashi Nonaka, Masato Hasegawa, Antonella Consiglio, Chiara Zurzolo
- Institutions:
- Centre National de la Recherche Scientifique, Centre National de la Recherche Scientifique, Centre National de la Recherche Scientifique, Centre National de la Recherche Scientifique, Centre National de la Recherche Scientifique, Federico II University Hospital, Institut d'Investigació Biomédica de Bellvitge, Institut d'Investigació Biomédica de Bellvitge, Institut d'Investigació Biomédica de Bellvitge, Institut Pasteur, Institut Pasteur, Institut Pasteur, Institut Pasteur, Institut Pasteur, Tokyo Metropolitan Institute of Medical Science, Tokyo Metropolitan Institute of Medical Science, Université Paris Cité, Université Paris Cité, Université Paris Cité, Université Paris Cité, Université Paris Cité, Université Paris-Saclay, University of Cambridge, University of Naples Federico II
- Publication date:
- 2026-03-12
- OpenAlex record:
- View
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