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- W2023127790 abstract "Hemopoietic precursors with the ability to differentiate into wide varieties of cell types are considered primitive, as are precursors with long-term repopulating ability. Here we study the populations of marrow precursors from which both myeloid and lymphoid lineages are descended shortly after transplantation. Surprisingly, few or none of these precursors show long-term repopulating ability. Equal portions of a mixture of marrow cells from C57BL/6J (B6) and congenic B6-Hbbd Gpi-1a mice are transplanted into a group of recipients. Three weeks later, highly significant correlations between percentages of B6 type T cells, B cells, granulocytes, and platelets in each recipient indicate that many lymphoid and myeloid cells are descended from common precursors. After 4-6 weeks, most correlations between lymphoid and myeloid cells improve, indicating that most or all differentiated cells are descended from common precursors. The more differentiated myeloid-specific precursors found in spleen colony-forming cell assays apparently fail to contribute significantly to the differentiated myeloid cell populations tested. By using the binomial model, in which variability of the data among the recipients is inversely related to the number of precursors in the mixture, donor precursor concentrations are estimated as approximately 21 per 10(5) marrow cells after 3 weeks, falling 3-fold to 6.6 per 10(5) after 4-6 weeks. This trend continues, with higher correlations, greater variabilities, and donor precursor concentrations of 1.9 per 10(5) marrow cells after 12-14 weeks and 1.4 per 10(5) after 24 weeks. Strong increases in variances between 3 and 12 weeks after transplantation suggest that most or all of the initially active multilineage precursors are exhausted during this time period. The fact that the ability of a hemopoietic stem cell to differentiate into widely disparate lineages is not associated with long-term repopulating ability requires a change in stem cell definitions, since primitive hemopoietic stem cells have traditionally been defined by both these abilities." @default.
- W2023127790 created "2016-06-24" @default.
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- W2023127790 date "1992-11-01" @default.
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- W2023127790 title "The same exhaustible multilineage precursor produces both myeloid and lymphoid cells as early as 3-4 weeks after marrow transplantation." @default.
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- W2023127790 doi "https://doi.org/10.1073/pnas.89.21.10134" @default.
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