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- W2333546620 endingPage "3652" @default.
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- W2333546620 abstract "Abstract Thymic repopulation by transplanted hematopoietic progenitor cells (HPC) is likely to be important for long-term immune reconstitution and for successful gene therapy of diseases affecting the T-cell lineage. However, the T-cell progenitor potential of HPC, cultured in vitro for cell number expansion and gene transfer remains largely unknown. Here, we cultured highly purified human umbilical cord blood (CB) CD34+CD38− or CD34+CD38+ cells for up to 5 weeks in stroma-free cultures supplemented with various combinations of the cytokines thrombopoietin (TPO), stem cell factor (SCF), flt3/flk-2 ligand (FL), interleukin-3 (IL-3), and IL-6 and investigated thymus-repopulating ability of expanded cells in vitro and in vivo. After up to 5 weeks of culture in IL-3 + SCF + IL-6 or TPO + FL + SCF supplemented medium, the progeny of CD34+CD38− CB cells generated T cells and natural killer cells in the thymus. Limiting dilution experiments demonstrated increase in the number of T-cell progenitors during culture. After 3 weeks of culture, gene marked CD34+CD38− CB cells injected in the human thymus fragment transplanted in severe combined immunodeficient (SCID) mice (SCID-hu) generated thymocytes expressing the retroviral encoded marker gene GFP in vivo. Thus, our results show that the progeny of CD34+CD38− CB cells cultured for extensive periods, harbor thymus-repopulating cells that retain T-cell progenitor potential after expansion and gene transfer." @default.
- W2333546620 created "2016-06-24" @default.
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- W2333546620 date "1999-12-01" @default.
- W2333546620 modified "2023-09-28" @default.
- W2333546620 title "Thymic Repopulation by CD34+ Human Cord Blood Cells After Expansion in Stroma-Free Culture" @default.
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- W2333546620 doi "https://doi.org/10.1182/blood.v94.11.3644" @default.
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