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• W1991388591 abstract "This study was designed to determine the stage in haemopoietic cell differentiation from multipotential stem cells at which erythropoietin becomes physiologically important. The responses of haemopoietic precursor cells were monitored in the bone marrow of mice under conditions of high (after bleeding) and low (after hypertransfusion) ambient erythropoietin levels. The number of relatively mature erythroid precursors (CFU-E), detected by erythroid colony formation after 2 days of culture, increased three-fold in marrow by the fourth day after bleeding, and decreased three-fold after hypertransfusion. Assessed by sensitivity to killing by a brief exposure to tritiated thymidine (3H-TdR) in vitro, the proliferative activity of CFU-E was high (75% kill) in untreated and bled animals, and was slightly lower (60% kill) after hypertransfusion. The responses of more primitive erythroid progenitors (BFU-E), detected by erythroid colony formation after 10 days in culture, presented a contrasting pattern. After hypertransfusion they increased slightly, while little change was noted until the fourth day after bleeding, when they decreased in the marrow. The same response pattern was observed for the progenitors (CFU-C) detected by granulocyte/macrophage colony formation in culture. The sensitivity of BFU-E to 3H-TdR was normally 30%, and neither increased after bleeding nor decreased after hypertransfusion. However, in regenerating marrow the 3H-TdR sensitivity of BFU-E increased to 63%, and this increase was not affected by hypertransfusion. These results are interpreted as indicating (1) that physiological levels of erythropoietin do not influence the decision by multipotential haemopoietic stem cells to differentiate along the erythroid pathway as opposed to the granulocyte/macrophage pathway; (2) that early erythroid-committed progenitors themselves do not respond to these levels of erythropoietin, but rather are subject to regulation by erythropoietin-independent mechanisms; and (3) that physiological regulation by erythropoietin commences in cells at a stage of maturation intermediate between BFU-E and CFU-E." @default.
• W1991388591 created "2016-06-24" @default.
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• W1991388591 date "1977-07-01" @default.
• W1991388591 modified "2023-10-16" @default.
• W1991388591 title "THE ROLE OF ERYTHROPOIETIN IN REGULATION OF POPULATION SIZE AND CELL CYCLING OF EARLY AND LATE ERYTHROID PRECURSORS IN MOUSE BONE MARROW" @default.
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• W1991388591 doi "https://doi.org/10.1111/j.1365-2184.1977.tb00300.x" @default.
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