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Department of Neuropathology, Tokyo Metropolitan Institute for Neuroscience, Tokyo, Japan
To characterize the nature of autoimmune disease-inducing T cells in the target organ, oligoclonal expansion of spinal cord T cells of Lewis rats with experimental autoimmune encephalomyelitis (EAE) was examined by complementarity-determining region 3 (CDR3) size spectratyping. It is known that TCR of in vitro-established myelin basic protein-specific T cell clones and lines have a short CDR3 and that the amino acid sequence in this region is highly preserved. On the basis of these findings, we analyzed 22 spectratypes of the TCR ß-chain (Vß1–20). Among them, only Vß8.2 and Vß17 showed oligoclonal expansion of TCR with a short CDR3 at the early stage of EAE. More interestingly, the spectratype profile of Vß8.2 seen at the early stage was preserved throughout the course of EAE, whereas that of Vß17 became more diverse at the peak stage of the disease. Analysis of nucleotide and predicted amino acid sequences of Vß8.2 CDR3 derived from the spectratypes revealed that the clones with CASSDSSYEQYFGPG, which is one of the representative sequences of encephalitogenic T cell clones, constituted the predominant population not only at the early stage but also at the peak and recovery stages (71, 71, and 60%, respectively). These findings imply that although the phenotype of T cells in the target organ diversifies as the autoimmune disease progresses, disease-associated TCR spectratype(s) are preserved throughout the course of the disease. Thus, CDR3 size spectratyping is a powerful tool for the screening of disease-inducing T cells in an autoimmune disease of unknown pathomechanism.
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