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- W2071593325 abstract "The identification and characterization of nongenotoxic carcinogens represents a significant challenge to toxicologists. In vitro methods for identifying tumor promoters with suitable sensitivity and specificity have been particularly elusive. Experiments are described which suggest that the human promyelocytic leukemia cell line HL-60 provides a sensitive indicator of promoter-induced changes to gene regulation and expression. As a result of differentiation these cells undergo a transition from a non-phagocytic suspension culture to an attached fibroblast-like culture which exhibits high phagocytic activity. Fluorescent latex particles were used as sensors to highlight the phagocytic phenotype and permitted the use of flow cytometry to automatically quantitate particle internalization. To evaluate specificity, HL-60 cells were treated with a series of phorbol esters covering a range of in vivo tumor promoting activity. Results indicate that this family of compounds induces HL-60 cells to differentiate in proportion to their in vivo promoting activity. To closely assess the sensitivity of the phagocytic endpoint, HL-60 cells were treated with picogram levels of 12-O-tetradecanoyl phorbol-13-acetate (TPA), whereupon increments as low as 50 pg of TPA per ml caused statistically significant increases in phagocytic activity. The experiments described herein suggest that in vitro differentiation of HL-60 cells may reflect the promoter-dependent modifications to gene expression that are observed in vivo during the promotion phase of carcinogenesis. The described method may represent a sensitive promoter screening assay which is both rapid and economical." @default.
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- W2071593325 date "1995-02-01" @default.
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- W2071593325 title "Development of a sensitive in vitro method for identifying tumor promoters" @default.
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- W2071593325 doi "https://doi.org/10.1016/0165-1161(95)90030-6" @default.
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