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Misfolded amyloid-ß-42 impairs the endosomal–lysosomal pathway
journal contribution
posted on 2023-06-15, 21:08 authored by Karen MarshallKaren Marshall, Devkee M Vadukul, Kevin StarasKevin Staras, Louise SerpellLouise SerpellMisfolding and aggregation of proteins is strongly linked to several neurodegenerative diseases, but how such species bring about their cytotoxic actions remains poorly understood. Here we used specifically-designed optical reporter probes and live fluorescence imaging in primary hippocampal neurons to characterise the mechanism by which prefibrillar, oligomeric forms of the Alzheimer’s-associated peptide, Aß42, exert their detrimental effects. We used a pH-sensitive reporter, Aß42-CypHer, to track Aß internalisation in real-time, demonstrating that oligomers are rapidly taken up into cells in a dynamin-dependent manner, and trafficked via the endo-lysosomal pathway resulting in accumulation in lysosomes. In contrast, a non-assembling variant of Aß42 (vAß42) assayed in the same way is not internalised. Tracking ovalbumin uptake into cells using CypHer or Alexa Fluor tags shows that preincubation with Aß42 disrupts protein uptake. Our results identify a potential mechanism by which amyloidogenic aggregates impair cellular function through disruption of the endosomal–lysosomal pathway.
History
Publication status
- Published
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- Published version
Journal
Cellular and Molecular Life SciencesISSN
1420-682XPublisher
Springer VerlagExternal DOI
Volume
77Page range
5031-5043Event location
SwitzerlandDepartment affiliated with
- Biochemistry Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2021-09-16First Open Access (FOA) Date
2021-09-16First Compliant Deposit (FCD) Date
2021-09-16Usage metrics
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