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- W2100035392 abstract "Abstract Human CD34+ hematopoietic precursor cells cultured on delta-like ligand 1 expressing OP9 (OP9-DL1) stromal cells differentiate to T lineage cells. The nature of the T cells generated in these cultures has not been studied in detail. Since these cultures do not contain thymic epithelial cells which are the main cell type mediating positive selection in vivo, generation of conventional helper CD4+ and cytotoxic CD8+ TCRαβ cells is not expected. Phenotypically mature CD27+CD1− TCRγδ as well as TCRαβ cells were generated in OP9-DL1 cultures. CD8 and few mature CD4 single-positive TCRαβ cells were observed. Mature CD8 single-positive cells consisted of two subpopulations: one expressing mainly CD8αβ and one expressing CD8αα dimers. TCRαβ CD8αα and TCRγδ cells both expressed the IL2Rβ receptor constitutively and proliferated on IL-15, a characteristic of unconventional T cells. CD8αβ+ and CD4+ TCRαβ cells were unresponsive to IL-15, but could be expanded upon TCR stimulation as mature CD8αβ+ and CD4+ T cells. These T cells had the characteristics of conventional T cells: CD4+ cells expressed ThPOK, CD40L, and high levels of IL-2 and IL-4; CD8+ cells expressed Eomes, Runx3, and high levels of granzyme, perforin, and IFN-γ. Induction of murine or human MHC class I expression on OP9-DL1 cells had no influence on the differentiation of mature CD8+ cells. Similarly, the presence of dendritic cells was not required for the generation of mature CD4+ or CD8+ T cells. These data suggest that positive selection of these cells is induced by interaction between T precursor cells." @default.
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- W2100035392 date "2009-10-15" @default.
- W2100035392 modified "2023-10-14" @default.
- W2100035392 title "Functionally Mature CD4 and CD8 TCRαβ Cells Are Generated in OP9-DL1 Cultures from Human CD34+ Hematopoietic Cells" @default.
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- W2100035392 doi "https://doi.org/10.4049/jimmunol.0900714" @default.
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