Inhibition of hepatocarcinogenesis by the deletion of the p50 subunit of NF-kappaB in mice administered the peroxisome proliferator Wy-14,643.
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AbstractWy-14,643 (WY) is a hypolipidemic drug that induces hepatic peroxisome proliferation and tumors in rodents. We previously showed that peroxisome proliferators increase NF-kappaB DNA binding activity in rats, mice, and hepatoma cell lines, and that mice deficient in the p50 subunit of NF-kappaB had much lower cell proliferation in response to the peroxisome proliferator ciprofibrate. In this study we examined the promotion of hepatocarcinogenesis by WY in the p50 knockout (-/-) mice. The p50 -/- and wild type mice were first administered diethylnitrosamine (DEN) as an initiating agent. Mice were then fed a control diet or a diet containing 0.05% WY for 38 weeks. Wild-type mice receiving DEN only developed a low incidence of tumors, and the majority of wild-type mice receiving both DEN and WY developed tumors. However, no tumors were seen in any of the p50 -/- mice. Cell proliferation and apoptosis were measured in hepatocytes by BrdU labeling and the TUNEL assay, respectively. Treatment with DEN + WY increased both cell proliferation and apoptosis in both the wild-type and p50 -/- mice; DEN treatment alone has no effect. In the DEN/WY-treated mice, cell proliferation and apoptosis were slightly lower in the p50 -/- mice than in the wild-type mice. These data demonstrate that NF-kappaB is involved in the promotion of hepatic tumors by the peroxisome proliferator WY; however, the difference in tumor incidence could not be attributed to alterations in either cell proliferation or apoptosis.
CitationToxicol. Sci. 2006, 90 (2):331-336
DescriptionKEYWORDS - CLASSIFICATION: Acyl-CoA Oxidase;Adenoma,Liver Cell;Animals;Apoptosis;chemically induced;Carcinogens;Cell Proliferation;deficiency;drug effects;Diethylnitrosamine;genetics;Liver;Liver Neoplasms,Experimental;metabolism;mechanisms of carcinogenesis;Mice;Mice,Inbred Strains;Mice,Knockout;NF-kappa B;NF-kappa B p50 Subunit;pathology;prevention & control;Peroxisome Proliferators;Pyrimidines;Research;toxicity.
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- Issue date: 2003 Oct
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