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Updated: Aug 19, 2026
Induction and Clinical Scoring of Chronic-Relapsing Experimental Autoimmune Encephalomyelitis
Published on: July 4, 2007
Protracted, relapsing and demyelinating experimental autoimmune encephalomyelitis in DA rats immunized with syngeneic
J C Lorentzen1, S Issazadeh, M Storch
1Department of Rheumatology; Karolinska Hospital, Karolinska Institute, Stockholm, Sweden.
Abstract:
Experimental autoimmune encephalomyelitis (EAE) is a model for multiple sclerosis (MS). However, MS is a chronic, relapsing and demyelinating disease, whereas EAE in rats is typically a brief and monophasic disorder showing little demyelination. We demonstrate here that DA rats develop severe, protracted and relapsing EAE (SPR-EAE) after a subcutaneous immunization at the tail base with syngeneic spinal cord and incomplete Freund's adjuvant (IFA). The neurological deficits were accompanied by demyelinating inflammatory lesions in the spinal cord, with infiltrating T lymphocytes and perivascular deposition of immunoglobulins and complement. The induction of SPR-EAE was associated with humoral autoreactivity to myelin oligodendrocyte glycoprotein (MOG) and cellular autoreactivity to the rat myelin basic protein (MBP) peptides 69-87 and 87-101. These two peptides, as well as whole rat MBP, were encephalitogenic. In conclusion, we believe that the presently described demyelinating SPR-EAE represents a useful model for MS.
Insights
DA rats develop severe, protracted, and relapsing experimental autoimmune encephalomyelitis (EAE), a model for multiple sclerosis (MS). This demyelinating EAE model offers new insights into chronic neurological disease.
Area of Science:
- Neuroscience
- Immunology
- Pathology
Background:
- Experimental autoimmune encephalomyelitis (EAE) is a common animal model for multiple sclerosis (MS).
- Traditional rat EAE models often exhibit acute, monophasic disease with minimal demyelination, unlike chronic, relapsing MS.
- A need exists for EAE models that better recapitulate the chronic and demyelinating aspects of MS.
Purpose of the Study:
- To establish and characterize a novel rat model of severe, protracted, and relapsing EAE (SPR-EAE).
- To investigate the immunological and pathological features of this SPR-EAE model.
- To assess the utility of this model for studying MS.
Main Methods:
- Induction of EAE in DA rats via subcutaneous immunization with syngeneic spinal cord and incomplete Freund's adjuvant (IFA).
- Assessment of neurological deficits, spinal cord pathology (demyelination, inflammation), and immune responses.
- Evaluation of humoral and cellular autoreactivity to myelin antigens, including myelin oligodendrocyte glycoprotein (MOG) and myelin basic protein (MBP) peptides.
Main Results:
- DA rats developed severe, protracted, and relapsing EAE (SPR-EAE).
- Neurological deficits correlated with demyelinating inflammatory lesions in the spinal cord, T lymphocyte infiltration, and immunoglobulin/complement deposition.
- SPR-EAE induction involved humoral responses to MOG and cellular responses to MBP peptides (69-87, 87-101), which were encephalitogenic.
Conclusions:
- The described demyelinating SPR-EAE in DA rats serves as a valuable preclinical model.
- This model more closely mimics the chronic, relapsing, and demyelinating nature of multiple sclerosis.
- Further research using this SPR-EAE model can advance understanding and treatment strategies for MS.
