title: Tumor promoter-mediated inhibition of cell differentiation: suppression of the expression of erythroid functions in murine erythroleukemia cells.
abstract: Previous studies demonstrated that 12-O-tetradecanoyl-phorbol-13-acetate (TPA), a tumor promoter, is a potent inhibitor of inducer-mediated differentiation of murine erythroleukemia cells. Inhibition of cell differentiation was associated with inhibition of cell growth. The present studies, employing a cell line adapted for growth in TPA, demonstrate that inhibition of differentiation is not dependent upon inhibition of cell growth or a change in the cell division cycle; neither is inhibition of differentiation accompanied by detectable effect on cell uptake of [3H]hexamethylene bisacetamide, the inducer used in these studies. TPA causes an inhibition of expression of all hexamethylene bisacetamide-inducible erythroid characteristics measured, including commitment to terminal cell division, accumulation of globin mRNA, and synthesis of globins, spectrin, heme synthetic enzymes (delta-aminolevulinic acid dehydratase and uroporphyrinogen-I synthase) and heme. A hypothetical model for the inhibitory action of tumor promoters on terminal cell differentiation is discussed.
mesh_terms: D002454:Cell Differentiation / Q000187:drug effects*; D002455:Cell Division / Q000187:drug effects; D002460:Cell Line; D005914:Globins / Q000096:biosynthesis; D006418:Heme / Q000096:biosynthesis; D007700:Kinetics; D004915:Leukemia, Erythroblastic, Acute / Q000503:physiopathology*; D010704:Phorbols / Q000494:pharmacology*; D014176:Protein Biosynthesis; D012333:RNA, Messenger / Q000378:metabolism; D013049:Spectrin / Q000378:metabolism; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology*
chemical_list: D010704:Phorbols; D012333:RNA, Messenger; D013049:Spectrin; D006418:Heme; D005914:Globins; D013755:Tetradecanoylphorbol Acetate