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Updated: Oct 28, 2025
Rat Model of Widespread Cerebral Cortical Demyelination Induced by an Intracerebral Injection of Pro-Inflammatory Cytokines
Published on: September 21, 2021
Novel cell-based analysis reveals region-dependent changes in microglial dynamics in grey matter in a cuprizone model
Ilias Roufagalas1, Maria Avloniti1, Alexandra Fortosi1
1Department of Immunology, Laboratory of Molecular Genetics, Hellenic Pasteur Institute, Athens, Greece.
Abstract:
Microglia are key players in Multiple Sclerosis (MS), expressing many susceptibility genes for this disease. They constantly survey the brain microenvironment, but the precise functional relationships between microglia and pathological processes remain unknown. We performed a detailed assessment of microglial dynamics in three distinct grey matter regions in a cuprizone-induced demyelination model. We found that microglial activation preceded detectable demyelination and showed regional specificities, such as prominent phagocytic activity in cortical layer 5 and early hypertrophic morphology in hippocampal CA1. Demyelination happened earliest in cortical layer 5, although was more complete in CA1. In cortical layer 2/3, microglial activation and demyelination were less pronounced but microglia became hyper-ramified with slower process movement during remyelination, thereby maintaining local brain surveillance. Profiling of microglia using specific morphological and motility parameters revealed region-specific heterogeneity of microglial responses in the grey matter that might serve as sensitive indicators of progression in CNS demyelinating diseases.
Insights
Microglia activation precedes demyelination in Multiple Sclerosis (MS) grey matter. Their region-specific responses and dynamics offer insights into disease progression and surveillance mechanisms.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Microglia are central to Multiple Sclerosis (MS) pathogenesis, with many susceptibility genes linked to them.
- Their role in brain surveillance and pathological processes in MS remains incompletely understood.
Purpose of the Study:
- To investigate the regional specificities of microglial dynamics during demyelination in grey matter.
- To correlate microglial activation and morphology with demyelination and remyelination processes.
Main Methods:
- Utilized a cuprizone-induced demyelination model in rodents.
- Performed detailed assessments of microglial activation, morphology, and motility in distinct grey matter regions.
- Analyzed regional differences in demyelination and remyelination.
Main Results:
- Microglial activation was observed before detectable demyelination and exhibited regional variations.
- Specific patterns included prominent phagocytic activity in cortical layer 5 and hypertrophic morphology in hippocampal CA1.
- Cortical layer 5 showed the earliest demyelination, while CA1 exhibited more complete demyelination.
- In cortical layer 2/3, microglia displayed hyper-ramified morphology and slower process movement during remyelination, maintaining surveillance.
Conclusions:
- Microglial responses in grey matter are heterogeneous and region-specific during demyelination.
- These region-specific microglial dynamics can serve as sensitive indicators for monitoring the progression of central nervous system (CNS) demyelinating diseases like MS.
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