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• W2912135189 abstract "Phosphorylated histone H2AX (γ-H2AX) has been demonstrated as a DNA damage marker both in vitro and in vivo. We previously reported the effects of genotoxic carcinogens in the urinary bladder of rats by immunohistochemical analysis of γ-H2AX using samples from 28-day repeated-dose tests. To evaluate the application of γ-H2AX as a biomarker of carcinogenicity in the bladder, we examined species differences in γ-H2AX formation in the urinary bladder of mice. Six-week-old male B6C3F1 mice were treated orally with 12 chemicals for 4 weeks. Immunohistochemical analysis demonstrated that N-butyl-N-(4-hydroxybutyl)nitrosamine, p-cresidine and 2-acetylaminofluorene (2-AAF), classified as genotoxic bladder carcinogens, induced significant increases in γ-H2AX levels in the bladder urothelium. In contrast, genotoxic (2-nitroanisole, glycidol, N-nitrosodiethylamine and acrylamide) and non-genotoxic (dimethylarsinic acid and melamine) non-bladder carcinogens did not upregulate γ-H2AX. Importantly, 2-nitroanisole, a potent genotoxic bladder carcinogen in rats, significantly increased the proportion of γ-H2AX-positive cells in rats only, reflecting differences in carcinogenicity in the urinary bladder between rats and mice. Significant upregulation of γ-H2AX was also induced by uracil, a non-genotoxic bladder carcinogen that may be associated with cell proliferation, as demonstrated by increased Ki67 expression. 2-AAF caused γ-H2AX formation mainly in the superficial layer, together with reduced and disorganized expression of uroplakin III, unlike in rats, suggesting the mouse-specific cytotoxicity of 2-AAF in umbrella cells. These results suggest γ-H2AX is a useful biomarker reflecting species differences in carcinogenicity in the urinary bladder." @default.
• W2912135189 created "2019-02-21" @default.
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• W2912135189 date "2019-01-31" @default.
• W2912135189 modified "2023-10-16" @default.
• W2912135189 title "Immunohistochemistry of γ‐H2AX as a method of early detection of urinary bladder carcinogenicity in mice" @default.
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• W2912135189 doi "https://doi.org/10.1002/jat.3775" @default.
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