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Published on: June 25, 2019
Multiple system atrophy (MSA): topographic distribution of the alpha-synuclein-associated pathological changes
R A Armstrong1, N J Cairns, P L Lantos
1Vision Sciences, Aston University, Birmingham B4 7ET, UK. R.A.Armstrong@aston.ac.uk
In multiple system atrophy (MSA), glial cytoplasmic inclusions (GCIs) appear randomly, while neuronal pathology clusters. This suggests glial changes may precede neuronal damage in MSA.
Area of Science:
- Neuropathology
- Neurodegenerative Diseases
- Cell Biology
Background:
- Multiple system atrophy (MSA) is a progressive neurodegenerative disorder characterized by autonomic dysfunction, parkinsonism, and ataxia.
- The precise pathological mechanisms and the sequence of cellular events in MSA remain incompletely understood.
- Alpha-synuclein aggregation into glial cytoplasmic inclusions (GCIs) and neuronal inclusions (NIs) is a hallmark of MSA.
Purpose of the Study:
- To investigate the spatial distribution patterns of glial and neuronal pathology in multiple system atrophy (MSA).
- To determine the relationship between glial cytoplasmic inclusions (GCIs) and neuronal pathology in MSA.
- To elucidate the potential sequence of pathological events in MSA.
Main Methods:
- Analysis of alpha-synuclein immunohistochemistry in brain tissue samples from 10 individuals with MSA.
- Pattern analysis of glial cytoplasmic inclusions (GCIs) and neuronal inclusions (NIs) distribution.
- Spatial correlation analysis between GCIs, NIs, and abnormal neurons.
Main Results:
- Glial cytoplasmic inclusions (GCIs) exhibited random or clustered distribution patterns.
- Neuronal inclusions (NIs) and abnormal neurons were found in regular, spatially correlated clusters.
- GCIs did not show spatial correlation with neuronal inclusions or abnormal neurons.
Conclusions:
- The findings suggest that glial cytoplasmic inclusions (GCIs) represent an early pathological event in MSA.
- Neuronal pathology, including inclusions and abnormal neurons, appears to develop secondary to the primary glial pathology.
- Understanding the topographic distribution provides insights into the pathogenesis of multiple system atrophy.
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