Journal Article

Short-term carcinogenicity testing of 2-amino-1-methyl-6-phenylimidazo[4, 5-<i>b</i>]pyridine (PhIP) and 2-amino-3-methylimidazo[4, 5-f]quinoline (IQ) in Eμ-<i>pim</i>-1 transgenic mice

Ilona Kryspin Sørensen, Alicja Mortensen, Eva Kristiansen, Coen van Kreijl, Richard H. Adamson and Snorri S. Thorgeirsson

in Carcinogenesis

Volume 17, issue 10, pages 2221-2227
Published in print October 1996 | ISSN: 0143-3334
Published online October 1996 | e-ISSN: 1460-2180 | DOI: http://dx.doi.org/10.1093/carcin/17.10.2221
Short-term carcinogenicity testing of
                    2-amino-1-methyl-6-phenylimidazo[4, 5-b]pyridine (PhIP) and
                    2-amino-3-methylimidazo[4, 5-f]quinoline (IQ) in
                    Eμ-pim-1 transgenic mice

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The usefulness of transgenic Eμ-pim-1 mice over-expressing the pim-1 oncogene in lymphoid tissues, as sensitive test organisms was studied in a short-term carcinogenicity study. The mice were fed standard diet Altromin 1314 supplemented either with 0.03% 2-amino-1-methyl-6-phenylimidazo[4, 5-b]pyridine (PhIP) for 7 months or with 0.03% 2-amino-3-methylimidazo[4, 5-f] quinoline (IQ) for 6 months. PhIP and IQ are heterocyclic amines formed during cooking of meat and fish and are mutagenic to bacteria and cultured mammalian cells. PhIP is a potent mouse lymphomagen, while IQ is a liver carcinogen and also causes lung tumors and tumors of the forestomach in mice. We found that transgenic Eμ-pim-1 mice are highly susceptible to PhIP induced lymphomagenesis but do not respond to the IQ treatment. PhIP feeding of Eμ-pim-1 mice not only increased the total number of T-cell lymphomas but also decreased the latency time compared to either transgenic or wild-type controls. The effect was most pronounced in the treated female Eμ-pim-1 mice, which showed a higher incidence of PhIP induced T-cell lymphomas than transgenic males and a strongly reduced latency period after PhIP treatment compared to non-transgenic mice. Our results suggest that the transgenic Eμ-pim-1 mouse may be a useful model for short-term carcinogenicity screening of potential genotoxic carcinogens having the lymphoid system as target tissue. The carcinogen IQ which does not have the lymphoid system as a target was not recognized in this model.

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Subjects: Clinical Cytogenetics and Molecular Genetics

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