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Toxicological Sciences 53, 213-223 (2000)
Copyright © 2000 by the Society of Toxicology

Responses of Transgenic Mouse Lines p53+/- and Tg•AC to Agents Tested in Conventional Carcinogenicity Bioassays

Judson W. Spalding*,1, John E. French*, Stanley Stasiewicz*, Marianna Furedi-Machacek{dagger}, Fawn Conner{dagger}, Raymond R. Tice{dagger} and Raymond W. Tennant*

* National Institute of Environmental Health Sciences, Laboratory of Environmental Carcinogenesis and Mutagenesis, Research Triangle Park, North Carolina 27709; and {dagger} Integrated Laboratory Systems, Research Triangle Park, North Carolina 27709

The haplo-insufficient p53 knockout (p53+/-) and zetaglobin v-Ha-ras (Tg•AC) transgenic mouse models were compared to the conventional two rodent species carcinogen bioassay by prospectively testing nine chemicals. Seven of the chemicals classified as carcinogens in the conventional bioassay induced tumors in the liver or kidneys of B6C3F1 mice, and one (pentachlorophenol) also induced tumors in other tissues. Only three chemicals, furfuryl alcohol, pyridine, and pentachlorophenol, induced tumors in rats. The tumorigenic effect of pyridine was seen in F344 rats but not in Wistar strain rats. None of the chemicals induced tumors in the p53+/- transgenic mice, which is consistent with the absence of genotoxicity of these chemicals. Only two of the seven nongenotoxic carcinogens were positive in the Tg•AC model (lauric acid diethanolamine and pentachlorophenol). These results show that these transgenic models do not respond to many chemicals that show strain- or species-specific responses in conventional bioassays.

Key Words: Tg•AC, p53+/-; transgenic; mouse bioassays; cancer..


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