title: Effects of activin A/erythroid differentiation factor on erythroid and megakaryocytic differentiations of mouse erythroleukemia (Friend) cells: evidence for two distinct modes of cell response.
abstract: To further characterize activin A/erythroid differentiation factor (EDF) action on hematopoietic cell differentiation, we examined the effects of activin A/EDF on megakaryocytic and erythroid differentiation by determining acetylcholinesterase (AchE) activity and hemoglobin production in the mouse erythroleukemia (MEL) cell line F55. Activin A/EDF induced AchE activity of F55 cells in a dose-dependent manner. Erythroid differentiation of F55 cells, which was characterized by an increase in dianisidine-positive cells, was also induced by activin A/EDF. The effect of activin A/EDF on hemoglobin synthesis appeared more slowly compared with the effect on AchE activity. Erythroid differentiation induced by activin A/EDF was affected by the initial cell density, but AchE activity was not. Sodium orthovanadate, a tyrosine phosphatase inhibitor, markedly inhibited activin A/EDF-induced erythroid differentiation but not activin A/EDF-induced AchE activity. Other erythroid differentiation inducers, sodium butyrate and butyrylcholine chloride, mildly increased AchE activity in F55 cells, but N,N'-hexamethylene-bis-acetamide (HMBA), dimethyl sulfoxide (DMSO), and genistein did not. Dexamethasone inhibited HMBA-induced erythroid differentiation but did not affect activin A/EDF or sodium butyrate action. These results suggest that F55 cells potentially can differentiate into cells of a megakaryocytic lineage in addition to an erythroid lineage, and that activin A/EDF further potentiates the cell differentiation of this cell line. In addition, our results suggest that the mode of activin A/EDF effects on megakaryocytic differentiation is distinct from that on erythroid differentiation.
authors.affiliation: Third Department of Internal Medicine, Yamaguchi University School of Medicine, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Okafuji
authors.forename: K
authors.initials: K
authors.lastname: Kaku
authors.forename: M
authors.initials: M
authors.lastname: Seguchi
authors.forename: H
authors.initials: H
authors.lastname: Tanaka
authors.forename: Y
authors.initials: Y
authors.lastname: Azuno
authors.forename: T
authors.initials: T
authors.lastname: Kaneko
mesh_terms: D000110:Acetylcholinesterase / Q000096:biosynthesis; D028341:Activins; D000818:Animals; D002454:Cell Differentiation / Q000187:drug effects; D015672:Erythroid Precursor Cells / Q000187:drug effects* / Q000473:pathology; D006454:Hemoglobins / Q000096:biosynthesis; D007265:Inhibins / Q000494:pharmacology*; D004915:Leukemia, Erythroblastic, Acute / Q000473:pathology*; D008533:Megakaryocytes / Q000187:drug effects / Q000473:pathology; D051379:Mice; D014407:Tumor Cells, Cultured
chemical_list: D006454:Hemoglobins; D028341:Activins; D007265:Inhibins; D000110:Acetylcholinesterase