title: Tumor promoters inhibit spontaneous differentiation of Friend erythroleukemia cells in culture.
abstract: Clones of Friend erythroleukemia cells, characterized by the presence of 40-70% benzidine-positive cells synthesizing hemoglobin in the absence of inducing drugs, were treated with several phorbol diesters with a known range of tumor-promoting activity on mouse skin. Good correlation was found between the reported tumor-promoting activity of a particular phorbol diester and its ability to inhibit spontaneous erythroid differentiation in culture. The inhibition of differentiation by 12-O-tetradecanoyl-phorbol-13-acetate, the most active tumor promoter, was maximum after 4 days of treatment; this inhibition was reversed by removal of the phorbol diester no matter how long the period of treatment. Unlike control cells, which gradually revert to a population with a low percentage of benzidine-positive cells, cells treated with 12-O-tetradecanoyl-phorbol-13-acetate retained a high potential for spontaneous differentiation.
mesh_terms: D000818:Animals; D002454:Cell Differentiation / Q000187:drug effects*; D002455:Cell Division / Q000187:drug effects; D002460:Cell Line; D005914:Globins / Q000096:biosynthesis; D006454:Hemoglobins / Q000096:biosynthesis; D004915:Leukemia, Erythroblastic, Acute / Q000378:metabolism / Q000473:pathology*; D007942:Leukemia, Experimental / Q000378:metabolism / Q000473:pathology*; D010703:Phorbol Esters / Q000494:pharmacology; D010704:Phorbols / Q000494:pharmacology*; D013997:Time Factors
chemical_list: D006454:Hemoglobins; D010703:Phorbol Esters; D010704:Phorbols; D005914:Globins
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