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Updated: Oct 14, 2025
Determining Immune System Suppression versus CNS Protection for Pharmacological Interventions in Autoimmune Demyelination
Published on: September 12, 2016
Reduction in CD11c+ microglia correlates with clinical progression in chronic experimental autoimmune demyelination
Florian Mayrhofer1, Zhanna Dariychuk1, Anthony Zhen1
1IPRM, Shriners Hospital for Children, Sacramento, CA 95817, United States of America.
Abstract:
Multiple sclerosis (MS) is a chronic autoimmune demyelinating disease with high variability of clinical symptoms. In most cases MS appears as a relapsing-remitting disease course that at a later stage transitions into irreversible progressive decline of neurologic function. The mechanisms underlying MS progression remain poorly understood. Experimental autoimmune encephalomyelitis (EAE) is an animal model of MS. Here we demonstrate that mice that develop mild EAE after immunization with myelin oligodendrocyte glycoprotein 35-55 are prone to undergo clinical progression around 30 days after EAE induction. EAE progression was associated with reduction in CD11c+ microglia and dispersed coalescent parenchymal infiltration. We found sex-dependent differences mediated by p38α signaling, a key regulator of inflammation. Selective reduction of CD11c+ microglia in female mice with CD11c-promoter driven p38α knockout correlated with increased rate of EAE progression. In protected animals, we found CD11c+ microglia forming contacts with astrocyte processes at the glia limitans and immune cells retained within perivascular spaces. Together, our study identified pathological hallmarks of chronic EAE progression and suggests that CD11c+ microglia may regulate immune cell parenchymal infiltration in autoimmune demyelination.
Insights
Researchers identified key changes in microglia, a type of immune cell, during chronic multiple sclerosis (MS) progression in mice. These changes, particularly in female mice, are linked to disease worsening and offer potential therapeutic targets for MS.
Area of Science:
- Neuroimmunology
- Autoimmune Diseases
- Cellular Biology
Background:
- Multiple sclerosis (MS) is a chronic autoimmune disease characterized by neurological dysfunction.
- MS progression mechanisms are not fully understood.
- Experimental autoimmune encephalomyelitis (EAE) serves as a model for MS.
Purpose of the Study:
- To investigate the pathological hallmarks of chronic EAE progression.
- To explore the role of CD11c+ microglia in EAE progression.
- To identify sex-dependent differences in EAE progression.
Main Methods:
- Induction of EAE in mice using myelin oligodendrocyte glycoprotein 35-55.
- Monitoring clinical progression of EAE.
- Analyzing microglia populations (CD11c+) and immune cell infiltration.
- Investigating p38α signaling pathways and sex-dependent effects.
Main Results:
- Mice with mild EAE showed clinical progression around 30 days post-induction.
- EAE progression correlated with reduced CD11c+ microglia and increased parenchymal infiltration.
- Female mice with reduced CD11c+ microglia exhibited accelerated EAE progression, linked to p38α signaling.
- Protected mice showed CD11c+ microglia interacting with astrocytes and retaining immune cells perivascularly.
Conclusions:
- CD11c+ microglia play a role in regulating immune cell infiltration during autoimmune demyelination.
- Pathological hallmarks of chronic EAE progression include microglia changes and altered immune cell distribution.
- p38α signaling and sex-dependent mechanisms influence MS progression.
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