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- W2293996838 abstract "The target cell specificity of interleukin-3 (IL-3) was examined by flow cytometric analysis of IL-3 receptor (IL-3R) expression on rhesus monkey bone marrow (BM) cells using biotinylated IL-3. Only 2% to 5% of unfractionated cells stained specifically with the biotinylated IL-3 and most of these cells were present within the CD34+ subset. IL-3Rs were detected on small CD34dull/RhLA-DRbright/CD10+/CD27+/CD2-/++ +CD20- cells, which probably represent B-cell precursors. IL-3R+ CD34- BM cells, which were detected at low frequencies, consisted of small CD20dull/surface-IgM+/RhLA-DR+ cells. These cells represented immature B lymphocytes, whereas CD20bright mature B cells were IL-3R-. The highest IL-3R levels were detected on CD34dull/RhLA-DRbright blast-like cells. These cells differentiated into monocytes, neutrophils, and basophils after IL-3 and/or granulocyte-macrophage colony-stimulating factor (GM-CSF) stimulation in vitro. The CD34bright/IL-3R- subset contained all clonogenic erythroid and myeloid progenitors (burst- forming unit-erythroid and colony-forming unit-culture), whereas CD34bright/IL-3Rdull cells differentiated into monocytes, neutrophils, and erythroid cells after shorter culture periods. This finding showed that IL-3R expression increases during monocyte and granulocyte differentiation. Results of three-color experiments indicated that IL- 3Rs are expressed on CD34bright/RhLA-DRbright cells as well as on CD34bright/RhLA-DRdull cells, with the latter population expression approximately twofold to threefold lower IL-3R levels. A large fraction (> 30%) of single-cell/well-sorted CD34bright/RhLA-DRdull cells formed multilineage colonies after 2 to 4 weeks of stimulation with IL-3, GM- CSF, Kit ligand, and IL-6. Individual colonies contained cells that still expressed CD34 as well as differentiated monocytes, granulocytes, and erythroid cells. These results confirmed that the CD34bright/RhLA- DRdull subset was enriched for immature, multipotent progenitor cells, whereas the CD34bright/RhLA-DRbright population mainly contained lineage-committed precursors. The results are consistent with the concept that IL-3Rs are induced at very early stages of hematopoiesis, as identified by high expression of CD34 and low expression of RhLA-DR. IL-3R expression continues to be low during differentiation into lineage-committed progenitors; gradually increases on differentiating progenitor cells for B cells, granulocytes, monocytes, and, possibly also, erythrocytes; but finally declines to undetectable levels during terminal differentiation into mature cells of all lineages in peripheral blood, with the exception of basophils.(ABSTRACT TRUNCATED AT 400 WORDS)" @default.
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- W2293996838 date "1995-07-15" @default.
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- W2293996838 title "Differential expression of receptors for interleukin-3 on subsets of CD34-expressing hematopoietic cells of rhesus monkeys" @default.
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- W2293996838 doi "https://doi.org/10.1182/blood.v86.2.581.bloodjournal862581" @default.
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