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Related Experiment Video

Updated: Feb 23, 2026

Exogenous Administration of Microsomes-associated Alpha-synuclein Aggregates to Primary Neurons As a Powerful Cell Model of Fibrils Formation

Exogenous Administration of Microsomes-associated Alpha-synuclein Aggregates to Primary Neurons As a Powerful Cell Model of Fibrils Formation

Published on: June 26, 2018

E46K α-synuclein pathological mutation causes cell-autonomous toxicity without altering protein turnover or

Ignacio Íñigo-Marco^1,2, Miguel Valencia^1,3,4, Laura Larrea¹

¹Neuroscience Program, Center for Applied Medical Research, University of Navarra, Pamplona 31008, Spain.

Proceedings of the National Academy of Sciences of the United States of America

|September 14, 2017

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.

Keywords:

E46K mutation alpha-synuclein autonomous toxicity neuronal death serine 129 phosphorylation

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Last Updated: Feb 23, 2026

Exogenous Administration of Microsomes-associated Alpha-synuclein Aggregates to Primary Neurons As a Powerful Cell Model of Fibrils Formation

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Published on: June 26, 2018

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Sequential Extraction of Soluble and Insoluble Alpha-Synuclein from Parkinsonian Brains

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Published on: January 5, 2016

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.