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• W1979939650 endingPage "441" @default.
• W1979939650 startingPage "435" @default.
• W1979939650 abstract "Abstract Stem cell proliferation induced by potent cytokines usually leads to a loss of primitive potential through differentiation. In this study, the ability of cytokines and murine MS5 stromal cells to independently regulate the proliferation and long-term culture-initiating cell (LTC-IC) activity of primitive CD34+CD38low/neg human bone marrow cells was evaluated. To compare populations with identical proliferation histories, cells were labeled with carboxy fluorescein diacetate succinimidyl ester, and LTC-IC activity was assessed 4 days later in cells that had accomplished the same number of divisions with or without MS5 cells. MS5 cells counteracted dramatically the loss of LTC-IC activity observed in the presence of cytokines alone. Thus, in the presence of MS5 cells, means of 1233 (n = 5) and 355 (n = 9) LTC-IC–derived colony-forming cells (CFCs) were generated by 1000 cells that performed 3 and 4 divisions respectively, whereas 311 (n = 5) and 64 (n = 5) CFCs were generated by 1000 cells cultured without MS5 cells. Interestingly, MS5 cells had no detectable effect on the LTC-IC activity of cells that divided only twice in 4 days—1606 CFCs (n = 6) and 1993 (n = 6) CFCs, respectively, without and with MS5 cells—and a 48 additional hours of coculture were necessary to unmask changes in the LTC-IC activity mediated by stromal cells. These results indicate that cytokines and stroma-derived signals can regulate independently the proliferation and differentiation of primitive cells and that these stroma-derived extracellular factors act directly on their target cells." @default.
• W1979939650 created "2016-06-24" @default.
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• W1979939650 date "2001-01-15" @default.
• W1979939650 modified "2023-10-17" @default.
• W1979939650 title "Stromal cells retard the differentiation of CD34+CD38low/neg human primitive progenitors exposed to cytokines independent of their mitotic history" @default.
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• W1979939650 doi "https://doi.org/10.1182/blood.v97.2.435" @default.
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