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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
RESEARCH SUPPORT, U.S. GOV'T, P.H.S.
Local-clonal expansion of infiltrating T lymphocytes in chronic encephalitis of Rasmussen.
Journal of Immunology 1997 Februrary 2
Rasmussen's syndrome is a progressive and intractable form of epilepsy characterized pathologically by focal brain inflammation with large numbers of infiltrating T lymphocytes. To better understand the nature of the T cell response in this disease, we analyzed TCR expression in the brain lesions using PCR for quantitative assessment of TCRBV gene transcripts, together with size and sequence analysis of the third complementarity-determining region (CDR3) of the dominant TCR rearrangements. Restricted (oligoclonal) BV family usage was not observed, as all of the 22 BV PCR products were usually detected at levels exceeding the background. However, significant individual biases in the frequencies of different TCR families was evident. The distinct pattern of BV expression by infiltrating lymphocytes detected in the original PCR screening suggested a specific immune response. The primary structure of the rearranged CDR3 sequences for the BV family expressed at highest level in each sample was studied by size and sequence analysis. The data showed that predominant TCR BV families expressed in diseased brain tissue displayed limited size heterogeneity and extensive repetition of in-frame CDR3 nucleotide motifs. These findings demonstrate that the local immune response in Rasmussen's syndrome includes restricted T cell populations that have likely expanded from a few precursor T cells responding to discrete antigenic epitopes.
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