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Exogenous Administration of Microsomes-associated Alpha-synuclein Aggregates to Primary Neurons As a Powerful Cell Model of Fibrils Formation
Published on: June 26, 2018
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E46K α-synuclein pathological mutation causes cell-autonomous toxicity without altering protein turnover or
Ignacio Íñigo-Marco1,2, Miguel Valencia1,3,4, Laura Larrea1
1Neuroscience Program, Center for Applied Medical Research, University of Navarra, Pamplona 31008, Spain.
Summary
The E46K mutation in alpha-synuclein (aSyn) drives neurotoxicity through soluble species, not aggregation or phosphorylation. This toxicity is primarily cell-autonomous, offering insights into synucleinopathies.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- Alpha-synuclein (aSyn) is central to synucleinopathies, but its toxic mechanisms are unclear.
- Understanding aSyn toxicity is crucial for developing treatments for neurodegenerative diseases.
Purpose of the Study:
- To investigate the toxic mechanisms of alpha-synuclein (aSyn) using a primary neuronal model.
- To determine the role of specific aSyn mutations, phosphorylation, aggregation, and cell-to-cell spread in neuronal toxicity.
Main Methods:
- Developed a primary neuronal model for longitudinal survival analysis of fluorescently tagged aSyn.
- Utilized optical pulse-chase experiments to assess aSyn protein turnover.
- Assayed for non-cell-autonomous toxicity of E46K aSyn mutant.
Main Results:
- The E46K aSyn mutation was the most toxic, causing neuronal death.
- PLK2-dependent phosphorylation at serine 129 did not alleviate E46K aSyn toxicity, suggesting it's an epiphenomenon.
- E46K aSyn toxicity was primarily driven by soluble species, preceding aggregation, and was mostly cell-autonomous.
Conclusions:
- Soluble aSyn species, not aggregation or phosphorylation, are key drivers of toxicity in this model.
- Identified a minor non-cell-autonomous component, but toxicity is predominantly cell-autonomous.
- The study provides a model to dissect aSyn toxicity mechanisms and hallmarks in synucleinopathies.
