Clonal expansion of myelin basic protein-reactive T cells in patients with multiple sclerosis: restricted T cell receptor V gene rearrangements and CDR3 sequence

European Journal of Immunology
C VandevyverJ Zhang

Abstract

Myelin basic protein (MBP)-reactive T cells are thought to play an important role in the pathogenesis of multiple sclerosis (MS). In some patients with MS, these autoreactive T cells display a limited heterogeneity in their epitope recognition and T cell receptor (TCR) variable (V) gene usage. These individual-dependent properties of MBP-reactive T cells have led to the speculation that they may represent clonal expansion in vivo in some MS patients. In the present study, 51 MBP-reactive T cell clones derived from patients with MS and healthy individuals were examined for their epitope recognition and the TCR V alpha and V beta gene rearrangements. The V gene junctional region sequences of identified alpha and beta genes were further analyzed to probe their clonal origins, as the sequences are unique for individual clones. Our data showed that 26 clones derived from nine patients with MS shared a predominant reactivity to the immunodominant regions of MBP, 84-102, 110-129 and 143-168, and used various TCR V alpha and V beta rearrangements. The V gene usage of the clones was restricted to certain V alpha V beta combination(s) in a given MS patient, but varied among different patients. The sequence analysis revealed that the clon...Continue Reading

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