title: Retinyl acetate and all-trans-retinoic acid enhance erythroid colony formation in vitro by circulating human progenitors in an improved serum-free medium.
abstract: Retinyl acetate (RA) dramatically increased the production of early (d16) erythroid colonies in vitro by circulating human progenitor cells growing in an improved serum-free (SF) medium. In the absence of either erythropoietin (Epo) or insulin-like growth factor I (IGF-I), RA alone was able to induce the hemoglobinization of cells in these erythroid colonies. RA synergized with Epo or with IGF-I to yield increased numbers of well-hemoglobinized early colonies. In the presence of defined burst promoting activity (BPA) provided by recombinant human interleukin 3 (rHuIL-3) and hemin, RA and all-trans-retinoic acid (ATRA) were identical with respect to their differentiation-inducing function for early erythroid colonies. ATRA increased the number of these colonies in a concentration-dependent manner, with maximal stimulation (3.5-fold) occurring at 30 nM in the presence of 5.5 ng/ml IL-3, 0.1 mM hemin, 3.0 U/ml Epo and 30 nM IGF-I. This appears to be the first demonstration of erythropoietic activity of two metabolic derivatives of vitamin A in SF medium.
authors.affiliation: Department of Anatomy and Cell Biology, Faculty of Medicine, University of Toronto, Ontario, Canada.
authors.forename: P N
authors.initials: PN
authors.lastname: Correa
authors.forename: A A
authors.initials: AA
authors.lastname: Axelrad
mesh_terms: D002478:Cells, Cultured; D003114:Colony-Forming Units Assay; D016895:Culture Media, Serum-Free; D004224:Diterpenes; D004912:Erythrocytes / Q000187:drug effects*; D015672:Erythroid Precursor Cells / Q000166:cytology / Q000187:drug effects*; D004920:Erythropoiesis / Q000187:drug effects*; D004921:Erythropoietin / Q000494:pharmacology; D006427:Hemin / Q000494:pharmacology; D006801:Humans; D007334:Insulin-Like Growth Factor I / Q000494:pharmacology; D007377:Interleukin-3 / Q000494:pharmacology; D011994:Recombinant Proteins / Q000494:pharmacology; D000084562:Retinyl Esters; D014212:Tretinoin / Q000494:pharmacology*; D014801:Vitamin A / Q000031:analogs & derivatives* / Q000494:pharmacology
chemical_list: D016895:Culture Media, Serum-Free; D004224:Diterpenes; D007377:Interleukin-3; D011994:Recombinant Proteins; D000084562:Retinyl Esters; D004921:Erythropoietin; D014801:Vitamin A; C009166:retinol acetate; D014212:Tretinoin; D007334:Insulin-Like Growth Factor I; D006427:Hemin