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Original Article |
Correspondence to: Axel Roers, Department of Immunology, Institute for Genetics, University of Cologne, Weyertal 121, 50931 Cologne, Germany. Tel:49-221-478-4543 Fax:49-221-478-6360 E-mail:axel.roers{at}uni-koeln.de.
Clonal composition and T cell receptor (TCR) repertoire of CD4+ and CD8+ T cells infiltrating actively demyelinating multiple sclerosis (MS) lesions were determined with unprecedented resolution at the level of single cells. Individual CD4+ or CD8+ T cells were isolated from frozen sections of lesional tissue by micromanipulation and subjected to single target amplification of TCR-ß gene rearrangements. This strategy allows the assignment of a TCR variable region (V region) sequence to the particular T cell from which it was amplified. Sequence analysis revealed that in both cases investigated, the majority of CD8+ T cells belonged to few clones. One of these clones accounted for 35% of CD8+ T cells in case 1. V region sequence comparison revealed signs of selection for common peptide specificities for some of the CD8+ T cells in case 1. In both cases, the CD4+ T cell population was more heterogeneous. Most CD4+ and CD8+ clones were represented in perivascular infiltrates as well as among parenchymal T cells. In case 2, two of the CD8+ clones identified in brain tissue were also detected in peripheral blood. Investigation of the antigenic specificities of expanded clones may help to elucidate their functional properties.
Key Words: autoimmunity, demyelinating disease, T cell receptor ß chain, gene rearrangement, peripheral blood
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