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- W4243915428 abstract "Lymphomyeloid stem cells from the bone marrow of C57BL/6 mice treated with 5-fluorouracil (5-FU) were characterized with respect to 12 parameters using fluorescence-activated cell sorting and a competitive long-term repopulation assay. Stem cells were larger than lymphocytes and exhibited side light-scatter characteristic of blast cells. Most expressed low levels of Thy-1.2, high levels of Sca-1 (Ly6-A/E), H-2Kb, and AA4.1 antigens and stained brightly with rhodamine-123. Significantly, most long-term repopulating cells also expressed CD4, some at high density. In addition, a significant proportion displayed low to medium levels of the “lineage-specific” markers CD45R (B220), Gr- 1, and TER-119. A simple and rapid multiparameter sorting procedure enriched the stem cells 100-fold and substantially removed most other clonogenic cell types, including day 12 spleen colony-forming cells. Cells able to generate cobblestone colonies on stromal cells in vitro were co-enriched. Lethally irradiated mice transplanted with limiting numbers of the sorted stem cells did not survive unless cotransplanted with “compromised” marrow cells prepared by prior serial transplantation and shown to be depleted of long-term repopulating activity. A significant number of recipients transplanted with 25 to 100 sorted cells contained donor-derived B and T lymphocytes and granulocytes in their peripheral blood for at least 6 months. Limiting dilution analysis in vivo indicated that the frequency of competitive long-term repopulating units (CRU) in the sorted population was at least 1 in 60 cells. The calculated frequency of CRU was largely independent of the time of recipient analysis between 10 and 52 weeks, indicating that highly enriched stem cells can be recruited relatively early in certain transplant settings. This simple enrichment and assay strategy for repopulating hematopoietic stem cells should facilitate further analysis of their regulation in vivo." @default.
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- W4243915428 date "1993-05-01" @default.
- W4243915428 modified "2023-10-16" @default.
- W4243915428 title "Phenotypic and functional characterization of competitive long-term repopulating hematopoietic stem cells enriched from 5-fluorouracil- treated murine marrow" @default.
- W4243915428 doi "https://doi.org/10.1182/blood.v81.9.2310.bloodjournal8192310" @default.
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