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- W2007981394 abstract "Trichloroethylene (TCE) is an industrial solvent and a widespread environmental contaminant. Induction of liver cancer in mice by TCE is thought to be mediated by two carcinogenic metabolites, dichloroacetate (DCA) and trichloroacetate (TCA). TCE is considered to be a relatively weak peroxisome proliferator (PP), a group of rodent hepatocarcinogens that cause adaptive responses in liver through the PP-activated receptor alpha (PPARα). The objectives of this study were to determine whether effects of TCE, TCA and DCA in the liver associated with carcinogenesis are mediated by PPARα. Male wild-type and PPARα-null mice were given TCE by gavage for 3 days or 3 weeks; TCA or DCA were given in the drinking water for 1 week. Increases in relative liver and kidney weights by TCE were dependent on PPARα whereas liver weight increases by DCA were PPARα-independent. Dose-dependent increases in hepatocyte proliferation observed in wild-type mice after TCE exposure as determined by BrdU-labeling of hepatocytes were PPARα-dependent. Transcript profiling using macroarrays containing ∼1200 genes showed that 93% (40 out of 43) of all expression changes observed in wild-type mice upon TCE exposure were dependent on PPARα and included known targets of PP (Cyp4a12, epidermal growth factor receptor) and additional genes involved in cell growth. Increases in enzymes that catalyze β- and ω-oxidation of fatty acids were dependent on PPARα after exposure to TCE, TCA or DCA. TCE altered a unique set of genes in the livers of PPARα-null mice compared to wild-type mice including those that respond to different forms of stress. These data support the hypothesis that PPARα plays a dominant role in mediating the effects associated with hepatocarcinogenesis upon TCE exposure." @default.
- W2007981394 created "2016-06-24" @default.
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- W2007981394 date "2004-10-01" @default.
- W2007981394 modified "2023-10-17" @default.
- W2007981394 title "Role of the peroxisome proliferator-activated receptor α (PPARα) in responses to trichloroethylene and metabolites, trichloroacetate and dichloroacetate in mouse liver" @default.
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- W2007981394 doi "https://doi.org/10.1016/j.tox.2004.06.014" @default.
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