title: Recombinant murine steel factor stimulates in vitro production of granulocyte-macrophage progenitor cells.
abstract: The ability of murine Steel factor to promote the in vitro production of granulocyte-macrophage progenitor cells (CFU-GM) was examined in short-term liquid cultures. Bone marrow from C57BL/6J or Sl/Sld mice was placed in culture for seven days with either Steel factor alone or in the presence of IL-3. CFU-GM responsive to GM-CSF, IL-3, and CSF-1 were measured in the input population and again after 3 or 7 days in culture. Steel factor alone increased the number of all CFU-GM types as early as 3 days after culture initiation, with further increases at day 7. This effect was potentiated by the addition of IL-3. Production of CFU-GM by C57BL/6J or Sl/Sld marrow was comparable except for enhanced production of CSF-1 responsive progenitors by Sl/Sld marrow. A recombinant Sld protein was also shown to be equivalent to the wild-type protein in its capacity to promote CFU-GM production from normal bone marrow.
mesh_terms: D000818:Animals; D006098:Granulocytes / Q000166:cytology*; D006410:Hematopoiesis / Q000187:drug effects*; D016298:Hematopoietic Cell Growth Factors / Q000494:pharmacology*; D008264:Macrophages / Q000166:cytology*; D051379:Mice; D008810:Mice, Inbred C57BL; D008817:Mice, Mutant Strains; D011994:Recombinant Proteins; D019089:Stem Cell Factor
chemical_list: D016298:Hematopoietic Cell Growth Factors; D011994:Recombinant Proteins; D019089:Stem Cell Factor