title: Effect of recombinant stem cell factor on clonogenic maturation and cycle status of human fetal hematopoietic progenitors.
abstract: Studies were undertaken to delineate the actions of stem cell factor (SCF) on human fetal hematopoietic progenitors in vitro. Mononuclear cells from umbilical cord blood of term fetuses were "panned" immunologically, and the resulting hematopoietic progenitors were grown in methylcellulose culture containing various concentrations of SCF alone or in combination with other recombinant hematopoietic growth factors. Neutralizing antibodies to IL-3 and granulocyte-macrophage colony-stimulating factor were added to all plates to which recombinant IL-3 or granulocyte-macrophage colony-stimulating factor were not included to decrease any confounding effect resulting from production of small quantities of these factors within the culture plates. SCF, as a single agent, supported clonogenic maturation of fetal granulocyte-macrophage progenitors (granulocyte-macrophage colony-forming unit, p < 0.05), multipotent progenitors (CFU-MIX, p < 0.05), and erythroid progenitors (erythroid burst-forming unit, p < 0.05). When combined with subplateau concentrations (0.1 microgram/L) of IL-3 or granulocyte-macrophage colony-stimulating factor, SCF had an additive or synergistic effect on clonogenic maturation of granulocyte-macrophage colony-forming unit and CFU-MIX. When combined with higher concentrations (5.0 micrograms/L) of IL-3 or granulocyte-macrophage colony-stimulating factor, SCF generally did not enhance colony formation but did increase the number of cells per colony. Like other pleiotropic cytokines such as IL-6, IL-9, and IL-11, SCF had a broad spectrum of action of fetal hematopoietic progenitors.
authors.affiliation: Division of Human Development and Aging, University of Utah School of Medicine, Salt Lake City 84132.
authors.forename: K R
authors.initials: KR
authors.lastname: Schibler
authors.forename: R K
authors.initials: RK
authors.lastname: Ohls
authors.forename: T
authors.initials: T
authors.lastname: Le
authors.forename: K W
authors.initials: KW
authors.lastname: Liechty
authors.forename: R D
authors.initials: RD
authors.lastname: Christensen
mesh_terms: D002453:Cell Cycle / Q000187:drug effects; D003114:Colony-Forming Units Assay; D004357:Drug Synergism; D005260:Female; D005312:Fetal Blood / Q000166:cytology*; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000008:administration & dosage / Q000494:pharmacology; D006410:Hematopoiesis / Q000187:drug effects / Q000502:physiology; D016298:Hematopoietic Cell Growth Factors / Q000008:administration & dosage / Q000494:pharmacology* / Q000502:physiology; D006412:Hematopoietic Stem Cells / Q000166:cytology / Q000187:drug effects*; D006801:Humans; D066298:In Vitro Techniques; D007377:Interleukin-3 / Q000008:administration & dosage / Q000494:pharmacology; D011247:Pregnancy; D011994:Recombinant Proteins / Q000008:administration & dosage / Q000494:pharmacology; D019089:Stem Cell Factor
chemical_list: D016298:Hematopoietic Cell Growth Factors; D007377:Interleukin-3; D011994:Recombinant Proteins; D019089:Stem Cell Factor; D016178:Granulocyte-Macrophage Colony-Stimulating Factor