Abstract
Mutations in the Kras2 gene are seen in both human and mouse lung adenocarcinomas. The protein product (p21ras) encoded by the Kras2 gene must be post-translationally modified at a terminal CAAX motif in order to be biologically active. In this study, we systematically investigated the chemopreventive efficacy of two different farnesyltransferase inhibitors (FTIs): one is a peptidomimetic (FTI-276) and the other is an imidazole (L778–123). Both FTIs are designed to inhibit the post-translational modification of p21ras proteins with a terminal CAAX motif. In a complete chemoprevention study, where the inhibitor was administered before carcinogen was given, and throughout the study, FTI-276 treatment significantly reduced both the tumor multiplicity by 41.7% (P<0.005), and the total tumor volume by 79.4% (P<0.0001). In the late treatment study, where mice were treated with an inhibitor 12 to 20 weeks after carcinogen administration, FTI-276 treatment resulted in a 60% reduction in tumor multiplicity and 58% reduction in tumor volume. Next, we examined the chemopreventive efficacy of a new FTI, L-778,123, on lung tumor development in A/J mice and transgenic mice with a dominant-negative p53 mutation and/or heterozygous deletion of Ink4a/Arf. Treatment of mice with L-778,123 for a period of 10 weeks from 20 weeks to 30 weeks post carcinogen initiation resulted in an ∼50% decrease in tumor multiplicity in wild-type mice and mice with a dominant-negative p53 mutation and/or heterozygous deletion of the Ink4a/Arf tumor suppressor genes. Interestingly, tumor volume was decreased ∼50% in wild-type mice and in mice with an Ink4a/Arf heterozygous deletion, while tumor volume was decreased ∼75% in animals with a dominant-negative p53 and in mice with both a p53 mutation and heterozygous deletion of Ink4a/Arf. This result suggests that FTI exhibited a significantly (P<0.05) more efficacious chemopreventive effect in animals with alterations of p53 and Ink4a/Arf as contrasted with wild-type mice. Thus, FTIs are potent lung chemopreventive agents in both A/J mice and transgenic mice harboring a dominant-negative p53 and heterozygous deletion of Ink4a/Arf. In fact, L-778,123 is more effective in inhibiting primary lung progression in mice with a p53 mutation and/or an Ink4a/Arf deletion than in wild-type animals.
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Acknowledgements
We are grateful to Dr Roger W Wiseman for providing the original UL53-3 mice and Dr Ronald A DePinho for the original Ink4a/Arf−/− mice and to Merck and Co., Inc. for supplying L-778,123. We acknowledge Dr William J Lemon and Sandya Liyanarachchi for statistical assistance. This work is supported by National Institutes of Health; Grants R01CA58554 and R01CA78797.
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Zhang, Z., Wang, Y., Lantry, L. et al. Farnesyltransferase inhibitors are potent lung cancer chemopreventive agents in A/J mice with a dominant-negative p53 and/or heterozygous deletion of Ink4a/Arf. Oncogene 22, 6257–6265 (2003). https://doi.org/10.1038/sj.onc.1206630
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DOI: https://doi.org/10.1038/sj.onc.1206630
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