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Functionally different α-synuclein inclusions yield insight into Parkinson's disease pathology
Christian C Raiss1, Theresa S Braun1, Irene B M Konings1
1Nanobiophysics Group, MESA+ Institute for Nanotechnology &MIRA Institute for Biomedical Technology and Technical Medicine, Faculty of Science and Technology, University of Twente, Enschede, The Netherlands.
Scientific Reports
|March 18, 2016
Summary
Parkinson's disease involves alpha-synuclein (α-S) aggregates, or Lewy bodies (LBs). Different LB types form depending on induction, impacting cell toxicity and neuronal function.
Area of Science:
- Neuroscience
- Cell Biology
- Biochemistry
Background:
- Lewy bodies (LBs), composed of alpha-synuclein (α-S) aggregates, are a key pathological feature of Parkinson's disease (PD).
- The precise role of LBs in PD pathogenesis, whether neuroprotective or neurotoxic, remains incompletely understood.
- Investigating the functional diversity of α-S inclusions is crucial for understanding PD progression.
Purpose of the Study:
- To investigate how different induction methods influence the formation, morphology, and cellular localization of α-S inclusions.
- To correlate the characteristics of α-S inclusions with cellular toxicity and neuronal function.
- To determine if distinct types of α-S inclusions exist in both in vitro models and in vivo human brain tissue.
Main Methods:
- Induction of α-S inclusions using three distinct methods in SH-SY5Y neuroblastoma cells and primary rat neurons.
- Confocal and STED microscopy to analyze inclusion morphology, subcellular localization, and association with cellular compartments (e.g., proteasome).
- Cell viability assays to quantify the toxicity associated with different induction methods and inclusion types.
Main Results:
- Induction method-dependent variations in α-S inclusion morphology, location, and cellular function were observed.
- A correlation exists between the aggregation site of α-S and the observed cellular toxicity.
- Proteasome-associated, juxta-nuclear inclusions were linked to higher cytotoxicity, while cytosolic deposits were associated with less toxic methods.
- Distinct α-S inclusion types were identified not only in cell models but also in primary neurons and human mesencephalon tissue.
Conclusions:
- The formation of α-S inclusions is heterogeneous, with distinct types exhibiting different functional consequences.
- The cellular compartment and association with cellular machinery (like the proteasome) influence the toxicity of α-S aggregates.
- The existence of functionally diverse Lewy bodies in vitro and in vivo provides critical insights into Parkinson's disease mechanisms.
- Understanding Lewy body heterogeneity may offer new therapeutic targets for Parkinson's disease.
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