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Detection of Disease-associated α-synuclein by Enhanced ELISA in the Brain of Transgenic Mice Overexpressing Human A53T Mutated α-synuclein
Published on: May 30, 2015
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Brain region-dependent differential expression of alpha-synuclein
Katsutoshi Taguchi1, Yoshihisa Watanabe1, Atsushi Tsujimura1
1Department of Basic Geriatrics, Kyoto Prefectural University of Medicine, Kawaramachi-Hirokoji, Kamikyo-ku, Kyoto, Japan.
The Journal of Comparative Neurology
|September 12, 2015
Summary
Alpha-synuclein, a key component of Lewy bodies, aggregates in neurodegenerative diseases like Parkinson's disease (PD). This study maps its expression in mouse brains, identifying high levels in early PD-affected regions and varying synaptic patterns.
Area of Science:
- Neuroscience
- Molecular Biology
- Neurodegenerative Diseases
Background:
- Alpha-synuclein is the primary component of Lewy bodies (LBs) and is implicated in synaptic function.
- Abnormal alpha-synuclein aggregation is a hallmark of neurodegenerative disorders, including Parkinson's disease (PD).
- High intracellular expression of alpha-synuclein is considered a risk factor for pathological aggregation.
Purpose of the Study:
- To investigate the precise expression profile of alpha-synuclein in the adult mouse brain.
- To correlate alpha-synuclein expression with regions vulnerable to idiopathic PD progression.
- To differentiate alpha-synuclein expression in excitatory versus inhibitory synapses across brain regions.
Main Methods:
- Utilized immunohistochemistry and molecular markers to analyze alpha-synuclein expression patterns.
- Examined expression in specific brain regions known to be affected early in PD.
- Assessed co-localization with excitatory (vesicular glutamate transporter-1) and inhibitory (GABAergic) presynaptic markers.
Main Results:
- High alpha-synuclein expression was observed in neuronal cell bodies of early PD-affected regions: olfactory bulb, dorsal motor nucleus of the vagus, and substantia nigra pars compacta.
- Synaptic alpha-synuclein expression often correlated with the excitatory presynaptic marker vesicular glutamate transporter-1.
- Alpha-synuclein expression in inhibitory synapses varied by region, notably present in the olfactory bulb, globus pallidus, and substantia nigra pars reticulata, but absent in the cerebral cortex, subthalamic nucleus, and thalamus.
Conclusions:
- Neurons in early PD-affected regions exhibit high perikaryal alpha-synuclein levels, consistent with findings in human PD brains.
- The distribution of alpha-synuclein in synaptic profiles differs significantly across various brain regions.
- These regional expression differences may contribute to the selective vulnerability of neuronal populations in PD.
