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Immunity to T-Cell Receptor: Suppressive Vaccination with DNA Encoding a Variable Region Gene of the T-Cell Receptor

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706
A common theme found in studies with mouse models of autoimmune diseases is that pathogenic T cells are primarily responsible for the pathology. Such models include diabetes in non-obese diabetic (NOD) mice, experimental autoimmune encephalomyelitis (EAE)—a model of multiple sclerosis (MS), collagen II (CII)-induced arthritis (CIA)—a model of rheumatoid arthritis (RA). Pathogenic T cells in EAE utilize a restricted repertoire of genes encoding the T-cell receptor (TCR) (1 ). For example, upon immunization of H-2u mice with either myelin basic protein, or its immunodominant fragment, peptide Ac1-20, the Vβ8.2 TCR gene product is expressed in the majority of pathogenic T cells (2 4 ). The restricted usage of the Vβ8.2 TCR gene product has also been found in rats in which EAE was induced by a peptide of myelin basic protein (5 ). Similarly, a restriction in the TCR usage was found also in CII-induced arthritis in mice (6 ,7 ), and in the TCR alpha chain usage in non-obese diabetic (NOD) mice (8 ).
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