title: Synergy among erythropoietin, interleukin 3, stem cell factor (c-kit ligand) and interferon-gamma on early human hematopoiesis.
abstract: The stimulatory effect of interferon-gamma (IFN-gamma) on human early hematopoiesis was investigated using CD34+ cells that were purified from peripheral blood as a target. In the presence of human interleukin 3 (IL-3) and stem cell factor (SCF), the growth of colony forming units for granulocyte/macrophage (CFU-GM) in serum-free methylcellulose culture was enhanced up to 5.5-fold over baseline colony formation (n = 10, mean +/- SE, 3.18 +/- 1.00) by coculture with 2.5 x 10(3) U/ml IFN-gamma, whereas burst forming units-erythroid (BFU-E) growth induced by additional erythropoietin (Epo) was reduced dose-dependently. Liquid-suspension culture of the target cells for 24 h with IFN-gamma before secondary plating in serum-free methylcellulose resulted in a marked increase in the colony numbers; 3.62 +/- 1.04-fold for CFU-GM and 5.72 +/- 2.32-fold for BFU-E (n = 5). The effect was most striking in the growth of erythroid lineage supported by Epo alone in serum-free culture. Delayed addition of IFN-gamma between days 4 and 7 of methylcellulose culture suppressed CFU-GM growth, but not that of BFU-E. These results suggest that IFN-gamma is an essential cytokine that affects human hematopoiesis and exerts a bimodal effect on stem cell maturation; potentiating or replacing the effect of early-acting cytokines such as SCF or IL-3, and suppressing the growth of matured progenitor cells.
authors.affiliation: Department of Pediatrics, University of Tokushima, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Kawano
authors.forename: Y
authors.initials: Y
authors.lastname: Takaue
authors.forename: A
authors.initials: A
authors.lastname: Hirao
authors.forename: J
authors.initials: J
authors.lastname: Sato
authors.forename: T
authors.initials: T
authors.lastname: Abe
authors.forename: T
authors.initials: T
authors.lastname: Suzue
authors.forename: S
authors.initials: S
authors.lastname: Saito
authors.forename: Y
authors.initials: Y
authors.lastname: Okamoto
authors.forename: Y
authors.initials: Y
authors.lastname: Kuroda
mesh_terms: D015703:Antigens, CD / Q000032:analysis; D018952:Antigens, CD34; D002478:Cells, Cultured; D003114:Colony-Forming Units Assay; D016895:Culture Media, Serum-Free; D004357:Drug Synergism; D015672:Erythroid Precursor Cells / Q000187:drug effects; D004921:Erythropoietin / Q000494:pharmacology*; D016179:Granulocyte Colony-Stimulating Factor / Q000494:pharmacology; D006410:Hematopoiesis / Q000187:drug effects*; D016298:Hematopoietic Cell Growth Factors / Q000494:pharmacology*; D006801:Humans; D007371:Interferon-gamma / Q000494:pharmacology*; D007377:Interleukin-3 / Q000494:pharmacology*; D011994:Recombinant Proteins / Q000494:pharmacology; D019089:Stem Cell Factor
chemical_list: D015703:Antigens, CD; D018952:Antigens, CD34; D016895:Culture Media, Serum-Free; D016298:Hematopoietic Cell Growth Factors; D007377:Interleukin-3; D011994:Recombinant Proteins; D019089:Stem Cell Factor; D004921:Erythropoietin; D016179:Granulocyte Colony-Stimulating Factor; D007371:Interferon-gamma