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- W2090906960 abstract "We have previously shown that human IL-10-treated dendritic cells (DC) induce an antigen-specific anergy in CD4+ T lymphocytes. These anergic T cells are characterized by an inhibited proliferation, a reduced production of IL-2, and additionally display antigen-specific suppressor activity. In this study we investigated the mechanisms underlying the anergic state and regulatory function of these T cells. We did not observe enhanced rates of programmed cell death of anergic CD4+ suppressor T cells compared to T cells stimulated with mature DC. Cell cycle analysis by DNA staining and Western blot experiments revealed an arrest of anergic CD4+ T suppressor cells in the G1 phase. High levels of the IL-2-dependent cyclin-dependent kinase (cdk) inhibitor p27Kip1 were found in anergic CD4+ suppressor T cells resulting in an inhibited activation of retinoblastoma protein and an arrest of cell cycle progression in the G1 phase. Addition of IL-2, but not blocking of the CTLA-4 pathway restored the proliferation of the suppressor T cells. In contrast, both treatments induced a down-regulation of p27Kip1 and acomplete inhibition of the antigen-specific regulatory function as demonstrated by high proliferation and enhanced IFN-gamma production of co-cultured T cells. Further experiments demonstrated that p27Kip-expressing regulatory CD4+CD25+ T cells did not contribute to induction of T cell anergy in this model. Our data show that regulatory function of anergic CD4+ suppressor T cells is associated with an arrest in the G1 phase of the cell cycle mediated by increased levels of the IL-2- and CTLA-4-dependent cdk inhibitor p27Kip1." @default.
- W2090906960 created "2016-06-24" @default.
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- W2090906960 date "2003-07-01" @default.
- W2090906960 modified "2023-10-13" @default.
- W2090906960 title "Suppressor activity of anergic T cells induced by IL-10-treated human dendritic cells: association with IL-2- and CTLA-4-dependent G1 arrest of the cell cycle regulated by p27Kip1" @default.
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- W2090906960 doi "https://doi.org/10.1002/eji.200323600" @default.
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