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- W2079771719 abstract "The cellular parameters which modulate trans germ-line carcinogenesis by DNA-reactive agents have not yet been studied in detail. Therefore, we have measured in this study the formation and repair kinetics of the miscoding alkylation product O6-ethylguanine (O6-EtGua) in nuclear DNA of spermatogonial cells of the Syrian golden hamster (SGH) after exposure to either of two potent N-nitroso carcinogens, ethylnitrosourea (ENU) or diethylnitrosamine (DEN). Both compounds, the spontaneously decomposing ENU, and DEN, which has to be converted by cellular enzymes to the reactive ethyl diazonium ion, induce the same pattern of alkylation products in nuclear DNA. Adduct analyses were performed at the single-cell level by using a quantitative immunocytological assay and anti-(O6-EtGua) monoclonal antibodies. 1.5 h after intraperitoneal application of ENU (100 microg/g body weight) O6-EtGua levels in the nuclear DNA of spermatogonia were similar to those in other cell types of the same hamster. About 30% of the initially formed DNA adducts were still persistent in spermatogonial cells even 4 days after ENU exposure. The presence of O6-EtGua in DNA after exposure to DEN (100 microg/g body weight) implies the capability of hamster spermatogonial cells to convert nitrosamines into DNA-alkylating metabolites. This capability of male germ cells in combination with their limited repair capacity for a critical DNA adduct and their high rate of proliferation may be considered as a major risk factor for genetic effects including carcinogenesis in subsequent generation(s)." @default.
- W2079771719 created "2016-06-24" @default.
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- W2079771719 date "1997-12-01" @default.
- W2079771719 modified "2023-09-23" @default.
- W2079771719 title "Formation and persistence of the miscoding DNA alkylation product O6-ethylguanine in male germ cells of the hamster" @default.
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- W2079771719 doi "https://doi.org/10.1016/s0921-8777(97)00043-8" @default.
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