title: Retinoic acid enhances differentiation of v-myb-transformed monoblasts induced by okadaic acid.
abstract: Differentiation of various leukemic cells can be induced by liganded retinoic acid receptors and protein phosphatase inhibitors. In this study, we explored the effects of okadaic acid (OA), the phosphatase inhibitor, and retinoic acid (RA) in v-myb-transformed monoblasts BM2. OA induced differentiation of BM2 monoblasts into macrophage-like cells, as documented by analyses of cell morphology, cell cycle, phagocytic activity, non-specific esterase activity, production of reactive oxygen species and expression of vimentin and Mo-1. In contrast to many other leukemic cell lines, BM2 cells do not respond to retinoic acid. However, once exposed to OA and RA simultaneously, BM2 cells differentiate along monocyte/macrophage pathway more efficiently. We conclude that RA enhances differentiation of v-myb-transformed monoblasts induced by protein phosphorylation.
authors.affiliation: Institute of Experimental Biology, Faculty of Science, Masaryk University, Genetics and Molecular Biology, Kotlarska 2, 611 37 Brno, Czech Republic.
authors.forename: Petr
authors.initials: P
authors.lastname: Benes
authors.forename: Vendula
authors.initials: V
authors.lastname: Macecková
authors.forename: Jirina
authors.initials: J
authors.lastname: Zatloukalová
authors.forename: Lucie
authors.initials: L
authors.lastname: Kovárová
authors.forename: Jana
authors.initials: J
authors.lastname: Smardová
authors.forename: Jan
authors.initials: J
authors.lastname: Smarda
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000494:pharmacology*; D002454:Cell Differentiation / Q000187:drug effects*; D002461:Cell Line, Transformed; D045744:Cell Line, Tumor; D002645:Chickens; D020570:Genes, myb; D015151:Immunoblotting; D007938:Leukemia / Q000378:metabolism*; D008264:Macrophages / Q000166:cytology / Q000187:drug effects; D009000:Monocytes / Q000166:cytology / Q000187:drug effects*; D019319:Okadaic Acid / Q000494:pharmacology*; D015533:Transcriptional Activation / Q000187:drug effects; D014162:Transfection; D014212:Tretinoin / Q000494:pharmacology*
chemical_list: D000970:Antineoplastic Agents; D019319:Okadaic Acid; D014212:Tretinoin