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Updated: Aug 3, 2026
Rat Model of Widespread Cerebral Cortical Demyelination Induced by an Intracerebral Injection of Pro-Inflammatory Cytokines
Published on: September 21, 2021
Microglia and astrocyte activation in the frontal cortex of rats with experimental autoimmune encephalomyelitis
1Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC, CONICET-UNC), Departamento de Química Biológica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, X5000HUA Córdoba, Argentina.
Abstract:
Experimental autoimmune encephalomyelitis (EAE) is a widely used animal model for the human disease multiple sclerosis (MS), a demyelinating and neurodegenerative pathology of the central nervous system. Both diseases share physiopathological and clinical characteristics, mainly associated with a neuroinflammatory process that leads to a set of motor, sensory, and cognitive symptoms. In MS, gray matter atrophy is related to the emergence of cognitive deficits and contributes to clinical progression. In particular, injury and dysfunction in certain areas of the frontal cortex (FrCx) have been related to the development of cognitive impairments with high incidence, like central fatigue and executive dysfunction. In the present work we show the presence of region-specific microglia and astrocyte activation in the FrCx, during the first hours of acute EAE onset. It is accompanied by the production of the pro-inflammatory cytokines IL-6 and TNF-α, in the absence of detectable leukocyte infiltration. These findings expand previous studies showing presynaptic neural dysfunction occurring at the FrCx and might contribute to the understanding of the mechanisms involved in the genesis and prevalence of common MS symptoms.
Insights
Early neuroinflammation in the frontal cortex of experimental autoimmune encephalomyelitis (EAE) models, characterized by microglia and astrocyte activation, precedes leukocyte infiltration and may explain cognitive deficits in multiple sclerosis (MS).
Area of Science:
- Neuroscience
- Immunology
- Pathology
Background:
- Experimental autoimmune encephalomyelitis (EAE) models human multiple sclerosis (MS), a neurodegenerative disease.
- MS and EAE involve neuroinflammation, leading to motor, sensory, and cognitive symptoms.
- Frontal cortex (FrCx) dysfunction is linked to cognitive impairments like fatigue and executive dysfunction in MS.
Purpose of the Study:
- Investigate early neuroinflammatory changes in the frontal cortex during acute EAE.
- Determine the role of microglia and astrocytes in the initial stages of EAE.
- Correlate early FrCx changes with potential mechanisms underlying MS-related cognitive deficits.
Main Methods:
- Induction of acute EAE in a relevant animal model.
- Region-specific analysis of microglia and astrocyte activation in the frontal cortex.
- Measurement of pro-inflammatory cytokine production (IL-6, TNF-α).
- Assessment of leukocyte infiltration in the central nervous system.
Main Results:
- Region-specific activation of microglia and astrocytes was observed in the FrCx during early acute EAE.
- Pro-inflammatory cytokines IL-6 and TNF-α were produced in the FrCx.
- These inflammatory changes occurred in the absence of detectable leukocyte infiltration.
- Findings align with prior evidence of presynaptic neural dysfunction in the FrCx.
Conclusions:
- Early, localized neuroinflammation in the frontal cortex of EAE models involves glial activation and cytokine production.
- This early inflammatory response in the FrCx may contribute to the development of cognitive symptoms in MS.
- Understanding these initial mechanisms could inform therapeutic strategies for MS-related cognitive dysfunction.
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