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Major histocompatibility complex-controlled protective influences on experimental autoimmune encephalomyelitis are
S Issazadeh1, P Kjellén, T Olsson
1Department of Medicine, Karolinska Hospital, Stockholm, Sweden.
European Journal of Immunology
|June 1, 1997
Summary
The major histocompatibility complex (MHC) influences experimental autoimmune encephalomyelitis (EAE) development, with specific MHC and myelin basic protein (MBP) peptide combinations determining disease susceptibility and protection. This study identifies a key encephalitogenic epitope within the MBP 87-110 region.
Area of Science:
- Neuroimmunology
- Immunogenetics
- Autoimmunity
Background:
- Experimental autoimmune encephalomyelitis (EAE) is a T cell-mediated autoimmune disease model for multiple sclerosis.
- The rat major histocompatibility complex (MHC) significantly influences EAE susceptibility and T cell cytokine profiles.
- Previous studies showed allele-specific effects of MHC class I and II regions on EAE induced by myelin basic protein (MBP) peptide 63-88.
Purpose of the Study:
- To investigate the influence of different MBP peptide and MHC molecule combinations on EAE.
- To determine if MHC-associated protection against EAE is dependent on specific peptide sequences.
- To identify novel encephalitogenic epitopes within the MBP sequence.
Main Methods:
- Induction of EAE in various rat strains using different MBP peptides (63-88, 89-101, 87-110).
- Analysis of T cell cytokine profiles (Th1, Th2, TGF-beta) in vitro.
- Assessment of MHC haplotype associations with EAE susceptibility.
- In vivo CD8+ cell depletion experiments.
Main Results:
- MBP peptide 89-101 induced EAE in a broader and different set of rat MHC alleles compared to MBP 63-88.
- EAE-susceptible strains showed strong T helper (Th) 1-like responses to the peptides.
- Immunization with MBP 87-110 induced EAE associated with similar MHC haplotypes as MBP 89-101, with LEW.1N (RT1 pi) rats being relatively resistant.
- LEW.1N rats exhibited Th2-like and transforming growth factor-beta responses and aggravated disease upon CD8+ cell depletion.
- The MBP 87-110 region contains a major MHC-associated encephalitogenic epitope.
Conclusions:
- Both MHC-controlled promoting and protective influences on EAE are dependent on specific MHC/MBP peptide combinations.
- The MBP 87-110 region harbors a significant MHC-associated encephalitogenic epitope in rats.
- These findings highlight the complexity of MHC-peptide interactions in autoimmune disease pathogenesis.