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The presence of potentially autoreactive T cells is a necessary, but not sufficient, condition for the development of autoimmune disease. However, the relationship between T cell response and susceptibility to disease is not straightforward. In this report, we use experimental allergic encephalomyelitis as a model to demonstrate that subtle alterations of the T cell response to an encephalitogenic epitope are sufficient to cause a dramatic decrease in disease susceptibility. Transgenic expression of a fusion protein of hen egg lysozyme and an encephalitogenic peptide of myelin basic protein (MBP) residues 84-105, coexpressed with MHC class II, causes profound tolerance to hen egg lysozyme, while maintaining a near normal response to MBP. Detailed analysis of the T cell repertoire of transgenic animals using a panel of T cell hybridomas revealed a highly selective loss of one minor component of the response to the MBP84-104 region. Despite this, transgenic animals were highly resistant to experimental allergic encephalomyelitis induction with the MBP peptide, indicating that minor changes to the T cell repertoire may result in major alterations in disease susceptibility. Possible reasons for this are discussed.

the journal of immunology/the journal of immunology

Subtle Effects on Myelin Basic Protein-Specific T Cell Responses Can Lead to a Major Reduction in Disease Susceptibility in Experimental Allergic Encephalomyelitis