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• W2040823633 abstract "Trichloroacetate (TCA) and dichloroacetate (DCA) have been shown to be hepatocarcinogenic in mice when administered in drinking water. However, DCA produces pathological effects in the liver that are much more severe than those observed following TCA treatment in both rats and mice. To identify potential mechanisms involved in the liver pathology, the biotransformation of TCA and DCA was investigated in male Fischer 344 rats and B6C3F1 mice. Rodents were administered 5, 20, or 100 mg/kg [14C]TCA or [14C]DCA as a single oral dose in water. Elimination was examined by counting radioactivity in urine, feces, exhaled air, and carcass. Blood concentration over time curves were constructed for both TCA and DCA at the 20 and 100 mg/kg doses. Analysis of the data reveals two significant differences in the systemic clearance of TCA relative to DCA. First, DCA was much more extensively metabolized than TCA. More than 50% of any single dose of TCA was excreted unchanged in the urine of both rats and mice. In contrast, less than 2% of any dose of DCA was recovered in the urine as the parent compound. Second, while the blood concentration over time curves for TCA were similar in rats and mice, the blood concentrations of DCA were markedly greater in rats compared to those in mice, both when DCA was administered and when DCA resulted from metabolism of TCA. DCA was detected in the urine of TCA-treated animals and chloroacetate was found in the urine of DCA-treated animals. These metabolic products would be expected to arise from a free radical-generating, reductive dechlorination pathway. To evaluate the ability of acute doses of TCA and DCA to elicit a lipoperoxidative response, additional groups of mice were administered 0, 100, 300, 1000, and 2000 mg/kg TCA or DCA and thiobarbituric acid-reactive substances (TBARS) measured in liver homogenates. Both TCA and DCA enhanced the formation of TBARS in a dose-dependent manner, thereby providing further evidence of a reductive metabolic pathway. DCA was found to be the more potent of the chlorinated acetates in increasing TBARS formation in the livers of both rats and mice. In view of these data, it appears that the more extensive metabolism and rapid rate of elimination of DCA relative to TCA and the more potent lipoperoxidative activity of DCA may be important factors in the pathological effects associated with DCA treatment." @default.
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• W2040823633 title "Metabolism and lipoperoxidative activity of trichloroacetate and dichloroacetate in rats and mice" @default.
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