methional/carcinogenesis

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Metabolism of carcinogenic urethane to nitric oxide is involved in oxidative DNA damage.

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Carcinogenic urethane (ethyl carbamate) forms DNA adduct via epoxide, whereas carcinogenic methyl carbamate can not. To clarify a mechanism independent of DNA adduct formation, we examined DNA damage induced by N-hydroxyurethane, a urethane metabolite, using 32P-5'-end-labeled DNA fragments.

Site-specific DNA damage induced by nickel(II) ion in the presence of hydrogen peroxide.

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DNA damage induced by Ni(II) plus H2O2 was investigated by a DNA sequencing technique using 32P-5'-end-labeled DNA fragments obtained from human c-Ha-ras-1 protooncogene. Ni(II) induced strong DNA cleavage in the presence of H2O2 even without piperidine treatment. Piperidine-labile sites were

Metabolic activation of carcinogenic ethylbenzene leads to oxidative DNA damage.

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Ethylbenzene is carcinogenic to rats and mice, while it has no mutagenic activity. We have investigated whether ethylbenzene undergoes metabolic activation, leading to DNA damage. Ethylbenzene was metabolized to 1-phenylethanol, acetophenone, 2-ethylphenol and 4-ethylphenol by rat liver microsomes.

Human DNA damage induced by 1,2,4-benzenetriol, a benzene metabolite.

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Reactivities of benzene metabolites (phenol, catechol, hydroquinone, 1,4-benzoquinone, 1,2,4-benzenetriol) and related polyphenols (resorcinol, pyrogallol, phloroglucinol) with DNA were investigated by a DNA sequencing technique using 32P 5'-end-labeled DNA fragments obtained from human c-Ha-ras-1

Requirement of glutathione and cysteine in guanine-specific oxidation of DNA by carcinogenic potassium bromate.

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Potassium bromate (KBrO3), a food additive, induces renal-cell tumors in rats. KBrO3 induced 8-oxo-7, 8-dihydro-2'-deoxyguanosine (8-oxodG) formation in human leukemia cell line HL-60 as well as in its H2O2-resistant clone, HP100, suggesting no involvement of H2O2. Depletion of GSH by buthionine

Mechanism of metal-mediated DNA damage induced by metabolites of carcinogenic 2-nitropropane.

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2-Nitropropane (2-NP), a widely used industrial solvent, is carcinogenic to rats. To clarify the mechanism of carcinogenesis by 2-NP, we investigated DNA damage by 2-NP metabolites, N-isopropylhydroxylamine (IPHA) and hydroxylamine-O-sulfonic acid (HAS), using 32P-5'-end-labelled DNA fragments

Hydroxyurea induces site-specific DNA damage via formation of hydrogen peroxide and nitric oxide.

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Hydroxyurea is a chemotherapeutic agent used for the treatment of myeloproliferative disorders (MPD) and solid tumors. The mutagenic and carcinogenic potential of hydroxyurea has not been established, although hydroxyurea has been associated with an increased risk of leukemia in MPD patients. To

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