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- W2073544499 abstract "The chlorine disinfection by-products, dichloroacetic acid (DCA) and trichloroacetic acid (TCA), are carcinogenic in mouse liver. We have previously reported that DCA and TCA induced DNA hypomethylation in mouse liver. In the present study, we determined the temporal association for DNA hypomethylation and cell proliferation. Female B6C3F1 mice were administered daily doses of 500 mg/kg DCA or TCA by gavage and sacrificed at 24, 36, 48, 72, and 96 hours after the first dose. The proliferating cell nuclear antigen-labeling index in the liver was increased at 72 and 96 hours by both DCA and TCA, that is, at 72 hours the index was 1.00 ± 0.21, 0.51 ± 0.11, and 0.095 ± 0.016 for DCA, TCA, and the vehicle control, respectively. The mitotic index was also significantly increased at 96 hours. The promoter region for the c-myc gene was hypomethylated only at 72 and 96 hours and not at the earlier sacrifices. Similarly, the methylation of the c-myc gene in the kidney and urinary bladder was decreased only at 72 and 96 hours. In summary, enhancement of cell proliferation and decreased methylation of the c-myc gene were first observed simultaneously at 72 hours after the start of exposure. Thus, the results support the hypothesis that DCA and TCA induce DNA hypomethylation by inducing DNA replication and preventing the methylation of the newly synthesized strands of DNA. © 2001 John Wiley & Sons, Inc. J Biochem Mol Toxicol 15:100–106, 2001" @default.
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- W2073544499 date "2001-01-01" @default.
- W2073544499 modified "2023-09-23" @default.
- W2073544499 title "The effect of dichloroacetic acid and trichloroacetic acid on DNA methylation and cell proliferation in B6C3F1 mice" @default.
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- W2073544499 doi "https://doi.org/10.1002/jbt.5" @default.
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