title: Stem cell factor enhances the survival of irradiated human bone marrow maintained in SCID mice.
abstract: The effect of recombinant human stem cell factor (SCF) on the response of human fetal bone marrow progenitor cells to irradiation was studied using immunodeficient mice with human fetal bone grafts (SCID/Hu mice). SCID/Hu mice were treated with three intraperitoneal injections of 500 micrograms/kg SCF at 20 h before, two h before, and four h after 100 cGy total body irradiation. Fourteen days following irradiation, the fetal bone grafts were harvested and studied. Most of the isolated bone marrow cells were human, as determined by flow cytometry. Colony forming assays were performed on the bone marrow to determine the survival of erythroid (BFU-E) and myeloid (CFU-GM) precursor cells. A statistically significant increase in BFU-E and CFU-GM survival after irradiation was observed for bone marrow maintained in the SCF treated mice when compared to bone marrow from mice not treated with SCF. The enhancement in colony forming unit survival after irradiation ranged from 4.3-fold for BFU-E (p = 0.05) to 13.1-fold for CFU-GM (p = 0.002). These findings suggest that SCF may be of potential clinical value for the prevention of radiation-induced myelosuppression.
authors.affiliation: Department of Radiation Oncology, Stanford University Medical Center, California.
authors.forename: B R
authors.initials: BR
authors.lastname: Leigh
authors.forename: S
authors.initials: S
authors.lastname: Webb
authors.forename: S L
authors.initials: SL
authors.lastname: Hancock
authors.forename: S J
authors.initials: SJ
authors.lastname: Knox
mesh_terms: D000818:Animals; D001853:Bone Marrow / Q000196:embryology / Q000528:radiation effects*; D016026:Bone Marrow Transplantation; D003114:Colony-Forming Units Assay; D004357:Drug Synergism; D004921:Erythropoietin / Q000494:pharmacology; D016332:Fetal Tissue Transplantation; D006085:Graft Survival / Q000187:drug effects*; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000494:pharmacology; D016298:Hematopoietic Cell Growth Factors / Q000494:pharmacology* / Q000627:therapeutic use; D006412:Hematopoietic Stem Cells / Q000166:cytology / Q000187:drug effects / Q000528:radiation effects*; D006801:Humans; D007377:Interleukin-3 / Q000494:pharmacology; D051379:Mice; D016513:Mice, SCID; D011994:Recombinant Proteins / Q000494:pharmacology / Q000627:therapeutic use; D019089:Stem Cell Factor; D014183:Transplantation, Heterologous; D014916:Whole-Body Irradiation
chemical_list: D016298:Hematopoietic Cell Growth Factors; D007377:Interleukin-3; D011994:Recombinant Proteins; D019089:Stem Cell Factor; D004921:Erythropoietin; D016178:Granulocyte-Macrophage Colony-Stimulating Factor