Modeling Multiple Sclerosis in the Two Sexes: MOG<sub>35-55</sub>-Induced Experimental Autoimmune Encephalomyelitis

Brigitta Bonaldo; Antonino Casile; Francesca Montarolo; Antonio Bertolotto

doi:10.3791/65778

Modeling Multiple Sclerosis in the Two Sexes: MOG35-55-Induced Experimental Autoimmune...

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Modeling Multiple Sclerosis in the Two Sexes: MOG_35-55-Induced Experimental Autoimmune Encephalomyelitis

Modeling Multiple Sclerosis in the Two Sexes: MOG35-55-Induced Experimental Autoimmune Encephalomyelitis

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05:44 min

October 13, 2023

DOI: 10.3791/65778-v

Brigitta Bonaldo^1,2, Antonino Casile^1,2,3, Francesca Montarolo^1,2, Antonio Bertolotto^1,4

¹Neuroscience Institute Cavalieri Ottolenghi (NICO), ²Department of Neuroscience “Rita Levi-Montalcini”,University of Turin, ³School of Pharmacy, Pharmacology Unit,University of Camerino, ⁴Koelliker Hospital

Overview

This study focuses on experimental autoimmune encephalomyelitis (EAE), a widely used murine model of multiple sclerosis. C57BL/6J mice of both sexes are immunized with myelin oligodendrocyte glycoprotein peptide, allowing for the investigation of neuroinflammatory processes and testing therapeutic drugs.

Key Study Components

Area of Science

Neuroscience
Immunology
Neuroinflammation

Background

Experimental autoimmune encephalomyelitis (EAE) serves as a model for understanding multiple sclerosis.
The model helps assess immune-mediated mechanisms and therapeutic options.
It allows exploration of sex differences in disease presentation.
This model has limitations in fully replicating human disease characteristics.

Purpose of Study

To provide a protocol for EAE induction that includes both sexes in research.
To improve the accuracy of clinical evaluations using clinical score assessment and rotarod tests.
To investigate the role of environmental risk factors in disease progression.

Methods Used

The main platform involves immunizing C57BL/6J mice with MOG 35-55 peptide.
Both sexes of mice are included for evaluation of sex differences in EAE.
Daily clinical score and rotarod performance assessments are conducted post-immunization.
Rotarod sessions increase in difficulty to assess motor function over time.
Blinded investigators score clinical progression on a scale from 0 to 5.

Main Results

Both sexes exhibited increased clinical scores over time, with females scoring higher, but not significantly.
Males performed better than females in rotarod tests, especially in the chronic phase of the disease.
Data suggests that females may experience earlier disease onset.
The findings highlight potential differences in disease progression between sexes.

Conclusions

This study demonstrates a method for examining EAE that includes both sexes, enhancing understanding of multiple sclerosis.
The findings imply significant sex-related differences in disease progression and motor performance in EAE.
This work contributes to understanding the complexities associated with multiple sclerosis models.

Frequently Asked Questions

What are the advantages of using the EAE model?

The EAE model allows researchers to study autoimmune mechanisms relevant to multiple sclerosis and assess the efficacy of potential therapeutic interventions.

How is the EAE model induced in mice?

EAE is induced by immunizing mice with myelin oligodendrocyte glycoprotein peptide and using specific injection methods to assess clinical outcomes.

What types of data are obtained from this study?

Data include clinical scores reflecting disease progression and motor performance measurements from rotarod tests, providing insights into neuroinflammatory and demyelinating processes.

How does this model help understand sex differences in multiple sclerosis?

By including both sexes in the study, researchers can evaluate potential differences in disease onset and progression, contributing to a better understanding of sexual dimorphism in multiple sclerosis.

What are the limitations of the EAE model?

While widely used, the EAE model does not fully replicate all clinical features of multiple sclerosis in humans, posing challenges for translating findings.

Can the methods in this study be adapted for other diseases?

Yes, the protocol can be adapted for other immune-mediated conditions to study similar neuroinflammatory pathways and therapeutic responses.

What future studies could be conducted based on this research?

Future studies could explore the interactions of environmental risk factors with sex differences to further understand their roles in disease mechanisms.

Experimental autoimmune encephalomyelitis is one of the most widely used murine models of multiple sclerosis. In the current protocol, C57BL/6J mice of both sexes are immunized with myelin oligodendrocyte glycoprotein peptide, resulting mainly in ascending paresis of the tail and limbs. Here we discuss the protocol of EAE induction and evaluation.

Our research focuses on the experimental autoimmune encephalomyelitis, or, EIE, model, which can significantly enhance the understanding of peripheral immune-mediated mechanism and evaluate neuroinflammatory and partially demyelinating processes. This model has also been widely used to develop and test a wide range of therapeutic drugs. Due to the unknown etiology and complexity of multiple sclerosis, no animal model currently recapitulates all the clinical and radiological features displayed in humans.

Thus, it is quite challenging for the researchers to select the animal model most fitting for a specific experimental question. EAE is a widely used model of multiple sclerosis. However, due to several issue, only some studies are performed, and this model considered both sexes.

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