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

• Published in: Carcinogenesis (New York) 1996-10, Vol.17 (10), p.2221-2227
• Main Authors: Sørensen, Ilona Kryspin, Mortensen, Alicja, Kristiansen, Eva, van Kreijl, Coen, Adamson, Richard H., Thorgeirsson, Snorri S.
• Format: Article
• Language: English
• Subjects: Biological and medical sciences; Carcinogenesis, carcinogens and anticarcinogens; Chemical agents; Medical sciences; Tumors
• ISSN: 0143-3334; 1460-2180
• DOI: 10.1093/carcin/17.10.2221

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.