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Genotoxic Potential And In Vitro Tumour-promoting Potential Of 2-dodecylcyclobutanone And 2-tetradecylcyclobutanone, Two Radiolytic Products Of Fatty Acids.

K. Yamakage, H. Sui, R. Ohta, Tomoyasu Toyoizumi, K. Kawakami, Hirotaka Matsumoto, Toshitaka Takahashi, K. Sasaki, Mayu Ikezumi, Saki Negishi, K. Izumi, S. Todoriki, Kondo Takashi, M. Furuta
Published 2014 · Chemistry, Medicine

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The DNA-damaging and tumour-promoting effects of two 2-alkylcyclobutanones (2-ACBs), which are found in irradiated fat-containing foods, were investigated by use of the comet assay and in an azoxymethane (AOM)-induced colon-carcinogenesis study in rats, respectively. We conducted genotoxicity tests of 2-dodecylcyclobutanone (2-dDCB) and 2-tetradecylcyclobutanone (2-tDCB) according to the test guidelines for chemicals or drugs. In addition, a cell-transformation assay with Bhas 42 cells was performed to investigate their promoting potential in vitro. The Salmonella typhimurium mutagenicity assay (Ames test), conducted with five tester strains, revealed that neither 2-dDCB nor 2-tDCB possessed mutagenic activity. Moreover, both in the in vitro chromosomal aberration test on CHL/IU cells and the in vivo bone-marrow micronucleus test where mice were given 2-dDCB and 2-tDCB (orally, up to 2000 mg/kg bw/day), we did not detect any clastogenic effects. Furthermore, DNA strand-breaks were not detected in the in vitro comet assay with CHL/IU cells, and DNA adducts derived from 2-dDCB and 2-tDCB were not detected in the colon tissues of the mice used for the micronucleus tests, in rats from a repeated dose 90-day oral toxicity test (0.03% 2-tDCB in the diet), or in rats from the AOM-induced carcinogenesis study (0.025% 2-tDCB in the diet). An in vitro tumour-promotion assay with Bhas 42 cells revealed that the number of transformed foci increased significantly following treatment of cells in the stationary phase with 2-dDCB or 2-tDCB for 10 days. Our results indicate that neither 2-dDCB nor 2-tDCB were genotoxic chemicals. However, they exhibited promoting activity, at least in vitro, when Bhas 42 cells were continuously exposed to these chemicals at toxic doses.
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