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• W2032060564 abstract "Specific tolerance to LEW.1W (RT1U) heart allografts can be induced in adult LEW.1A (RT1a) rats by donorspecific blood transfusion (DST). We have previously shown that both rejected and tolerated grafts are heavily infiltrated by T lymphocytes, and that in both cases these T cells are capable of developing similar cytotoxic responses against donor cells in vitro; tolerance is therefore not due to the deletion of alloreactive T cells. At the same time, we found that the accumulation of IL-2 and IFN-γ mRNA was decreased in tolerated grafts compared with rejected grafts. These results suggested that the induction of allograft tolerance in DST-treated animals could be mediated by anergy or suppression of graft-infiltrating Th1 cells. Although Th1 and Th2 clones have not yet been characterized in the rat, peripheral CD4+ rat T cells can be divided into two populations, based on their expression of the isoform RC of the CD45 molecule. Upon activation, CD45RChigh CD4+ T cells produce IL-2 and IFN-γ and are responsible for the induction of the graft-versus-host reaction, whereas CD45RClow CD4+ T cells produce IL-4 in vitro and provide B cell help. In the present study, we show that heart allografts from both DST-treated and untreated rats were infiltrated by equivalent numbers of leukocytes, of which CD4+ T cells also made up similar percentages. Among these CD4+T cells, we observed that in allografts from DST-treated recipients the CD45RChigh population on day 5 was very significantly smaller (P=0.004) than in the untreated group, while CD45RClow populations remained comparable. Moreover, using a new quantitative RT-PCR method, we found a dramatic reduction in the accumulation of IL-2, IFN-γ, IL-10, IL-4, and IL-13 mRNA in hearts from DST-treated recipients compared with those of untreated recipients during the week following transplantation. These results show that in heart allografts from DST-treated recipients, despite phenotypic changes suggesting Th1 inhibition by Th2 imbalance, T helper function was inhibited as a whole, and that in vivo the phenotype CD4+ CD45RClow does not always correlate with Th2-related cytokine-producing cells." @default.
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• W2032060564 date "1995-11-01" @default.
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• W2032060564 title "GRAFT-INFILTRATING T HELPER CELLS, CD45RC PHENOTYPE, AND TH1/TH2-RELATED CYTOKINES IN DONOR-SPECIFIC TRANSFUSION–INDUCED TOLERANCE IN ADULT RATS" @default.
• W2032060564 doi "https://doi.org/10.1097/00007890-199511270-00013" @default.
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