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The Journal of Immunology, Vol 157, Issue 3 1250-1260, Copyright © 1996 by American Association of Immunologists
ARTICLES |
P Douillard, C Pannetier, R Josien, S Menoret, P Kourilsky, JP Soulillou and MC Cuturi
Institute of Transplantation and Research on Transplantation (ITERT), National Institute of Medicine and Medical Research (Unit 437), Nantes, France.
Following allotransplantation, determinants encoded within the donor MHC are recognized by recipient T lymphocytes through their Ag receptor. In this study, we investigated the TCR Vbeta chain diversity of T cells infiltrating rejected and tolerated heart allografts in a model of donor-specific blood transfusion-induced tolerance in MHC- mismatched congeneic rats. The PCR-based method that we used allows the diversity of Vbeta chains at the complementarity-determining region 3 level to be analyzed quantitatively. Our results show that the Vbeta repertoire usage in graft-infiltrating T cells was characteristic and different in tolerated compared with rejected grafts, and differed in both cases from the normal distribution of the Vbeta repertoire. An expansion of lymphocytes showing a conserved Vbeta18-Dbetal-Jbeta2.7 gene rearrangement was found, from the first day after grafting onward, in graft-infiltrating cells from all tolerant animals. This clone accounted for as much as 5% of the whole Vbeta repertoire in tolerated hearts, as evidenced by RNase protection assay. In contrast, we demonstrated that, of lymphocytes infiltrating rejected grafts, those with a Vbeta18 chain were diverse, and that even though by day 5 the conserved Vbeta18-Dbeta1-Jbeta2.7 rearrangement was detectable, lymphocytes harboring this rearrangement represented less than 0.6% of the whole TCR-alphabeta+ T cell repertoire. Kinetics analysis revealed that the expansion of lymphocytes bearing this conserved rearrangement was elicited specifically by donor blood transfusion. Indeed, Vbeta18- Dbeta1-Jbeta2.7 transcripts were detected in PBL from transfused animals as early as 7 days after donor-specific blood transfusion. Finally, we provided evidence that this T cell clone belongs to the CD8+ subset. The putative role in inducing and maintaining the allograft tolerance of the CD8+ T cell clone harboring this public Vbeta18-Dbeta1-Jbeta2.7 rearrangement is discussed.
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