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• W2008593161 abstract "The effects of structure on the activity of 27 polychlorinated dibenzo-p-dioxin (PCDD), dibenzofuran (PCDF), biphenyl (PCB) and polybrominated dibenzo-p-dioxin (PBDD) congeners has been determined in the immature male Wistar rat [body weight loss, thymic atrophy, hepatic microsomal aryl hydrocarbon hydroxylase (AHH) and ethoxyresorufin O-deethylase (EROD)] and in rat hepatoma H-4-II E cells in culture (AHH and EROD induction). There was a good linear correlation between the -log EC50 values for AHH induction (in vitro) and the in vivo -log ED50 values for AHH induction (r=0.85), body weight loss (r=0.93) and thymic atrophy (r=0.92) for the 27 compounds investigated in this study. Comparable in vivo studies have also been carried out using several PCDD and PCDF congeners (2,3,7,8-, 1,3,7,8- and 1,2,4,7,8-substituted PCDDs; 2,3,4,7,8-, 1,2,3,7,8-, 2,3,4,7,9- and 1,2,3,7,9-substituted PCDFs) using the guinea pig as the model. There were excellent linear correlations (r > 0.92) between the -log EC50 (in vitro AHH induction) vs. the -log ED50 (in vivo responses) and the -log ED50 (guinea pig in vivo data) vs. -log ED50 (rat in vivo data). These results further validate the utility of the in vitro AHH induction assay for quantitatively estimating the potential toxicity of PCB, PCDF and PCDD mixtures in environmental extracts. This assay can be carried out rapidly, is relatively inexpensive and utilizes the established (and stable) rat hepatoma H-4-II E cells in culture which can detect 20–50 pg of 2,3,7,8-TCDD equivalents per plate." @default.
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• W2008593161 date "1989-01-01" @default.
• W2008593161 modified "2023-10-15" @default.
• W2008593161 title "Validation of the AHH indoction bioassay for the determination of 2,3,7,8-TCDD toxic equivalents" @default.
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• W2008593161 doi "https://doi.org/10.1016/0045-6535(89)90221-x" @default.
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