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Studying Pre-formed Fibril Induced α-Synuclein Accumulation in Primary Embryonic Mouse Midbrain Dopamine Neurons
Published on: August 16, 2020
Mouse α-synuclein fibrils are structurally and functionally distinct from human fibrils associated with Lewy body
Arpine Sokratian1,2, Ye Zhou3, Meltem Tatli4
1Duke Center for Neurodegeneration Research, Department of Pharmacology and Cancer Biology, Duke University, Durham, NC 27710, USA.
Abstract:
The intricate process of α-synuclein aggregation and fibrillization holds pivotal roles in Parkinson's disease (PD) and multiple system atrophy (MSA). While mouse α-synuclein can fibrillize in vitro, whether these fibrils commonly used in research to induce this process or form can reproduce structures in the human brain remains unknown. Here, we report the first atomic structure of mouse α-synuclein fibrils, which was solved in parallel by two independent teams. The structure shows striking similarity to MSA-amplified and PD-associated E46K fibrils. However, mouse α-synuclein fibrils display altered packing arrangements, reduced hydrophobicity, and heightened fragmentation sensitivity and evoke only weak immunological responses. Furthermore, mouse α-synuclein fibrils exhibit exacerbated pathological spread in neurons and humanized α-synuclein mice. These findings provide critical insights into the structural underpinnings of α-synuclein pathogenicity and emphasize a need to reassess the role of mouse α-synuclein fibrils in the development of related diagnostic probes and therapeutic interventions.
Insights
Mouse alpha-synuclein fibrils, crucial for Parkinson's disease research, differ structurally from human forms. These differences impact their pathogenicity and immune response, necessitating a re-evaluation of their use in developing diagnostics and therapeutics.
Area of Science:
- Neuroscience
- Biochemistry
- Structural Biology
Background:
- Alpha-synuclein aggregation and fibrillization are central to Parkinson's disease (PD) and multiple system atrophy (MSA).
- Mouse alpha-synuclein fibrils are widely used in research, but their structural relevance to human disease remains unclear.
Purpose of the Study:
- To determine the atomic structure of mouse alpha-synuclein fibrils.
- To compare the structure and properties of mouse alpha-synuclein fibrils with human pathogenic forms.
Main Methods:
- Atomic structure determination of mouse alpha-synuclein fibrils by two independent teams.
- Comparative analysis of structural features, hydrophobicity, fragmentation sensitivity, and immunological response.
- Assessment of pathological spread in neuronal and mouse models.
Main Results:
- The atomic structure of mouse alpha-synuclein fibrils was solved, revealing similarities to MSA- and PD-associated human fibrils.
- Mouse fibrils exhibit distinct packing, reduced hydrophobicity, increased fragmentation, and weaker immunogenicity.
- Mouse alpha-synuclein fibrils show enhanced pathological spread in neuronal and humanized mouse models.
Conclusions:
- Mouse alpha-synuclein fibrils possess unique structural and functional characteristics compared to human pathogenic forms.
- These differences highlight the need to critically evaluate the utility of mouse alpha-synuclein fibrils in PD and MSA research.
- Reassessment is crucial for developing accurate diagnostic tools and effective therapeutic strategies for synucleinopathies.
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