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Recombinant human granulocyte-macrophage colony-stimulating factor (CSF), but not recombinant human granulocyte CSF, down-regulates the recombinant human stem cell factor-dependent differentiation of human fetal liver-derived mast cells


Recombinant human granulocyte-macrophage colony-stimulating factor (CSF), but not recombinant human granulocyte CSF, down-regulates the recombinant human stem cell factor-dependent differentiation of human fetal liver-derived mast cells



Journal of Immunology 159(2): 838-845



ISSN/ISBN: 0022-1767

PMID: 9218602

The effects of recombinant human granulocyte CSF (rhG-CSF) and recombinant human granulocyte-macrophage CSF (rhGM-CSF) on the recombinant human stem cell factor (rhSCF)-dependent development of human mast cells from fetal liver progenitors were examined. Mast cells were identified by immunohistochemical staining for tryptase and by flow cytometric analysis of surface Kit expression. Only rhGM-CSF affected mast cell development. When rhGM-CSF (1, 10, or 100 ng/ml) and rhSCF (50 ng/ml) were added to cell cultures from day 0, both the percentage and absolute numbers of mast cells were diminished after 4 wk compared with cultures exposed to rhSCF alone. Half of the maximal response was achieved at a dose of rhGM-CSF between 0.1 and 1 ng/ml. The Kit+ cells developing in the presence of rhGM-CSF and rhSCF exhibited an intensity of surface Kit expression comparable to that of cells exposed to rhSCF alone. Also, if the initial exposure to rhGM-CSF was delayed for 1 to 3 wk, attenuation of mast cell development waned. These findings are consistent with uncommitted progenitor cells being diverted to nonmast cell lineages by rhGM-CSF, while cells committed to a mast cell lineage, albeit immature, appear to be resistant to the lineage directives of rhGM-CSF. Exposure of fetal liver cells to rhGM-CSF for 1 to 3 days before addition of rhSCF further diminishes the number of mast cells that develop compared with the simultaneous addition of these growth factors on day 0. Whether administration of rhGM-CSF to humans before or together with rhSCF diminishes the mast cell hyperplasia that occurs with rhSCF alone remains to be determined.

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Accession: 018084517

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