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- W2000573839 abstract "Besides iatrogenic immunosuppression, endogenous suppression by regulatory T cells (Tregs) may also mediate inhibition of effector T cells after transplantation. Here we determined the effect of common immunosuppressive drug regimens on both Treg and effector T cells. Tregs and cytomegalovirus (CMV)-specific T cells were quantified in 88 renal transplant recipients, 58 hemodialysis patients, and 22 controls. T cell dynamics were longitudinally assessed within 20 weeks after transplantation. The number of Tregs was quantified by measurement of CD25 and/or FOXP3-positive cells and by functional assays. CMV-specific T cells were quantified by stimulation-induced intracellular cytokine analysis. Treg frequencies in transplant recipients were significantly lower compared to those in hemodialysis patients and controls. These lower Treg levels were associated with a less pronounced suppression of effector function. Treg levels decreased within the first weeks after transplantation and remained low in the long term. In contrast, although decreased at early post-transplant, long-term levels of CMV-specific T cells normalized to levels found in hemodialysis patients and controls. These studies suggest that there is an initial decrease of Tregs and effector T cells as a consequence of a direct inhibitory effect of immunosuppressive drugs. In the long term, persistently low Treg levels may favor normalization of effector T cells to ensure sufficient pathogen control." @default.
- W2000573839 created "2016-06-24" @default.
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- W2000573839 date "2009-09-01" @default.
- W2000573839 modified "2023-10-11" @default.
- W2000573839 title "Differential kinetics of effector and regulatory T cells in patients on calcineurin inhibitor–based drug regimens" @default.
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- W2000573839 doi "https://doi.org/10.1038/ki.2009.198" @default.
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