Distinct Region-Specific α-Synuclein Oligomers in A53T Transgenic Mice: Implications for Neurodegeneration
Open Access
- 3 March 2010
- journal article
- Published by Society for Neuroscience in Journal of Neuroscience
- Vol. 30 (9), 3409-3418
- https://doi.org/10.1523/jneurosci.4977-09.2010
Abstract
Aggregation of α-synuclein (α-syn), a process that generates oligomeric intermediates, is a common pathological feature of several neurodegenerative disorders. Despite the potential importance of the oligomeric α-syn intermediates in neuron function, their biochemical properties and pathobiological functionsin vivoremain vastly unknown. Here we used two-dimensional analytical separation and an array of biochemical and cell-based assays to characterize α-syn oligomers that are present in the nervous system of A53T α-syn transgenic mice. The most prominent species identified were 53 Å detergent-soluble oligomers, which preceded neurological symptom onset, and were found at equivalent amounts in regions containing α-syn inclusions as well as histologically unaffected regions. These oligomers were resistant to SDS, heat, and urea but were sensitive to proteinase-K digestion. Although the oligomers shared similar basic biochemical properties, those obtained from inclusion-bearing regions were prominently reactive to antibodies that recognize oxidized α-syn oligomers, significantly accelerated aggregation of α-synin vitro, and caused primary cortical neuron degeneration. In contrast, oligomers obtained from non-inclusion-bearing regions were not toxic and delayed thein vitroformation of α-syn fibrils. These data indicate that specific conformations of α-syn oligomers are present in distinct brain regions of A53T α-syn transgenic mice. The contribution of these oligomers to the development of neuron dysfunction appears to be independent of their absolute quantities and basic biochemical properties but is dictated by the composition and conformation of the intermediates as well as unrecognized brain-region-specific intrinsic factors.Keywords
This publication has 55 references indexed in Scilit:
- Dopamine and L‐dopa disaggregate amyloid fibrils: implications for Parkinson's and Alzheimer's diseaseThe FASEB Journal, 2004
- α-Synuclein: Normal Function and Role in Neurodegenerative DiseasesCurrent Topics in Developmental Biology, 2004
- Staging of brain pathology related to sporadic Parkinson’s diseaseNeurobiology of Aging, 2003
- Common Structure of Soluble Amyloid Oligomers Implies Common Mechanism of PathogenesisScience, 2003
- Oxidative Dimer Formation Is the Critical Rate-Limiting Step for Parkinson's Disease α-Synuclein FibrillogenesisBiochemistry, 2002
- Synaptic Vesicle Depletion Correlates with Attenuated Synaptic Responses to Prolonged Repetitive Stimulation in Mice Lacking α-SynucleinJournal of Neuroscience, 2002
- Human α-synuclein-harboring familial Parkinson's disease-linked Ala-53 → Thr mutation causes neurodegenerative disease with α-synuclein aggregation in transgenic miceProceedings of the National Academy of Sciences of the United States of America, 2002
- Neuronal α-Synucleinopathy with Severe Movement Disorder in Mice Expressing A53T Human α-SynucleinNeuron, 2002
- Synuclein: a neuron-specific protein localized to the nucleus and presynaptic nerve terminalJournal of Neuroscience, 1988
- Deficits in Feeding Behavior after Intraventricular Injection of 6-Hydroxydopamine in RatsScience, 1972