Animal Models of Multiple Sclerosis
1Incyte Research Institute, Wilmington, Delaware.
Abstract:
Animal models with high translational validity are essential tools in understanding disease pathogenesis and in the development of therapeutic strategies. Multiple sclerosis (MS) is an autoimmune demyelinating disease of the central nervous system characterized by progressive neurological deficits and socioeconomic burden. Experimental autoimmune encephalomyelitis (EAE) is the most extensively utilized animal model of MS, with well-characterized rodent and non-human primate variants. The EAE model is typically induced by either active immunization with myelin-derived proteins or peptides in adjuvant or by passive transfer of activated myelin-specific CD4+ T lymphocytes. To date, the EAE model has been an essential tool in the development of at least seven U.S. Food and Drug Administration (FDA)-approved immunomodulatory drugs for the treatment of MS, including glatiramer acetate, fingolimod, and natalizumab. However, the translational validity of the EAE model is frequently compromised due to poor study design, inconsistent clinical scoring endpoints, and inappropriate statistical calculations. No single animal model accurately reflects the complexity of human MS pathogenesis. Beyond EAE, multiple additional animal models are described, including Theiler's murine encephalomyelitis virus and cuprizone-induced demyelination, which facilitate the study of pathogen-induced CNS autoimmunity and remyelination, respectively. This overview summarizes several of the most frequently used animal models of MS and highlights key factors that significantly influence the experimental outcome and affect translational validity. © 2021 Wiley Periodicals LLC.
Insights
Animal models are crucial for understanding multiple sclerosis (MS) and developing treatments. While the experimental autoimmune encephalomyelitis (EAE) model has aided drug development, its translational validity is often limited by study design flaws.
Area of Science:
- Neuroscience
- Immunology
- Translational Medicine
Background:
- Multiple sclerosis (MS) is a debilitating autoimmune disease of the central nervous system.
- Animal models are vital for studying MS pathogenesis and therapeutic development.
- Experimental autoimmune encephalomyelitis (EAE) is a widely used MS model, but its translational validity is often compromised.
Purpose of the Study:
- To review commonly used animal models for multiple sclerosis (MS).
- To highlight factors influencing experimental outcomes and translational validity in MS research.
- To discuss the utility and limitations of animal models in MS drug development.
Main Methods:
- Overview of established MS animal models, including EAE, Theiler's murine encephalomyelitis virus, and cuprizone models.
- Discussion of induction methods for EAE, such as active immunization and passive T-cell transfer.
- Analysis of factors affecting translational validity, including study design and statistical analysis.
Main Results:
- The EAE model has contributed to the approval of seven MS drugs.
- Poor study design, inconsistent endpoints, and flawed statistics frequently undermine the EAE model's translational validity.
- No single animal model fully replicates the complexity of human MS.
Conclusions:
- While valuable, the EAE model requires rigorous study design to enhance its translational relevance.
- Alternative models like Theiler's murine encephalomyelitis virus and cuprizone models offer unique insights into specific aspects of MS.
- Improving the design and analysis of animal studies is crucial for advancing MS therapeutics.
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