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The positive response of Ty1 retrotransposition test to carcinogens is due to increased levels of reactive oxygen species generated by the genotoxins

  • Genotoxicity and Carcinogenicity
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Abstract

In previous laboratory and environmental studies, the Ty1 short-term test showed positive responses (i.e. induced mobility of the Ty1 retrotransposon) to carcinogenic genotoxins. Here, we provide evidence for a causal relationship between increased level of reactive oxygen species and induction the mobility of the Ty1 retrotransposon. Results obtained in concentration and time-dependent experiments after treatment, the tester cells with carcinogenic genotoxins [benzo(a)pyrene, benzo(a)anthracene, ethylmethanesulfonate, formamide], free bile acids (chenodeoxycholic, lithocholic acids) and metals (arsenic, hexavelant chromium, lead) showed a simultaneous increase in both cellular level of the superoxide anions and Ty1 retrotransposition rates. Treatment with the noncarcinogenic genotoxins [benzo(e)pyrene, benzo(b)anthracen, anthracene], conjugated bile acids (taurodeoxycholic, glycodeoxycholic acids) and metals (zinc, trivalent chromium) did not change significantly superoxide anions level and Ty1 retrotransposition rate. The induction by carcinogens of the Ty1 mobility seems to depend on the accumulation of superoxide anions, since the addition of the scavenger N-acetylcysteine resulted in loss of both increased amount of superoxide anions and induced Ty1 retrotransposition. Increased hydrogen peroxide levels are also involved in the induction of Ty1 retrotransposition rates in response to treatment with carcinogenic genotoxins, as evidenced by disruption of YAP1 gene in the tester cells. It is concluded that the carcinogen-induced high level of reactive oxygen species play a primary and key role in determination the selective response of Ty1 test to carcinogenic genotoxins.

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Acknowledgments

This research was supported partly by a grant of the NATO SfP project 977977 given to Pencho Venkov.

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Authors and Affiliations

  1. Sofia University Faculty of Biology, 8 “Dragan Tsankov” blvd, 1421, Sofia, Bulgaria

    Martin Dimitrov & Margarita Pesheva

  2. Institute of Cryobiology and Food Technology, 53A “Cherni Vrah” blvd, 1407, Sofia, Bulgaria

    Pencho Venkov

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  1. Martin Dimitrov
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  2. Pencho Venkov
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  3. Margarita Pesheva
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Correspondence to Margarita Pesheva.

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Dimitrov, M., Venkov, P. & Pesheva, M. The positive response of Ty1 retrotransposition test to carcinogens is due to increased levels of reactive oxygen species generated by the genotoxins. Arch Toxicol 85, 67–74 (2011). https://doi.org/10.1007/s00204-010-0542-8

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