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• W2143404712 abstract "1,4-Phenylenebis(methylene)selenocyanate (p-XSC) is an effective chemopreventive agent against 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK)-induced lung adenoma in female A/J mice. While p-XSC can effectively inhibit NNK-induced DNA methylation in female A/J mice and in male F344 rats, its effect on NNK-induced oxidative DNA damage had not been determined. Thus, the effect of p-XSC on the levels of 8-hydroxy-2'-deoxyguanosine (8-OH-dG) in lung DNA from A/J mice and F344 rats treated with NNK was examined. Mice were given NNK by gavage (0.5 mg/mouse in 0.2 ml corn oil, three times per week for 3 weeks) or by a single i.p. injection (2 mg/mouse in 0.1 ml saline) while maintained on a control diet (AIN-76A) or control diet containing p-XSC at 10 or 15 p.p.m. (as Se) starting 1 week before NNK administration and continuing until termination. Mice were killed 2 h after the last NNK gavage in the multiple administration protocol or 2 h after the single i.p. injection. Treatment with NNK by gavage significantly elevated the levels of 8-OH-dG in lung DNA of A/J mice from 0.7 +/- 0.1 to 1.6 +/- 0.2 adducts/10(5) 2'-deoxyguanosine (dG) (P < 0.001), while dietary p-XSC (at 10 p.p.m. Se) prevented significant elevation of the levels of this lesion caused by NNK, keeping them at 0.9 +/- 0.1 adducts/10(5) dG (P < 0.003). Injection of NNK in saline also significantly increased the levels of 8-OH-dG in lung DNA of A/J mice from 1.2 +/- 0.6 to 3.6 +/- 0.8/10(5) dG adducts (P < 0.01), while dietary p-XSC (at 15 p.p.m. Se) kept these levels at 1.9 +/- 0.5 adducts/10(5) dG (P < 0.03). Rats were given a single i.p. injection of NNK (100 mg/kg body wt) in saline while being maintained on control diet (AIN-76A) or control diet containing p-XSC (15 p.p.m. as Se) starting 1 week before NNK administration and continuing until termination. The rats were killed 2 h after injection. Treatment with NNK using this protocol significantly elevated the levels of 8-OH-dG in lung DNA of F344 rats from 2.6 +/- 0.5 to 3.5 +/- 0.5 adducts/10(5) dG (P < 0.03), while dietary p-XSC (at 15 p.p.m. Se) kept the levels of this lesion at 2.2 +/- 0.6 adducts/10(5) dG (P < 0.01). Our findings suggest that the chemopreventive efficacy of p-XSC against NNK-induced lung tumorigenesis in A/J mice and F344 rats may be due in part to inhibition of oxidative DNA damage." @default.
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• W2143404712 date "1998-10-01" @default.
• W2143404712 modified "2023-10-17" @default.
• W2143404712 title "Elevated 8-hydroxy-2'-deoxyguanosine levels in lung DNA of A/J mice and F344 rats treated with 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone and inhibition by dietary 1,4-phenylenebis(methylene)selenocyanate" @default.
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• W2143404712 doi "https://doi.org/10.1093/carcin/19.10.1783" @default.
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• W2143404712 hasPublicationYear "1998" @default.
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