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National Institute of Environmental Health Sciences

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Publication Detail

Title: N-nitroso-N-methylvinylamine: reaction of the epoxide with guanyl and adenyl moieties to yield adducts derived from both parts of the molecule.

Authors: Okazaki, O; Persmark, M; Guengerich, F P

Published In Chem Res Toxicol, (1993)

Abstract: N-Nitroso-N-methylvinylamine was synthesized and treated with dimethyldioxirane to produce 1-(N-nitrosomethylamino)oxirane. 1-(N-Nitrosomethylamino)oxirane had a t1/2 of < 5 s in buffer at neutral pH and 23 degrees C. This epoxide reacted with Ado to form 1,N6-etheno(epsilon-)Ado. It also reacted with DNA to form products arising from the oxirane portion of the molecule [N7-(2-oxoethyl)Gua,N2,3-epsilon-Gua, and 1,N6-epsilon-dAdo] and the methyl group (N7-methylGua). NADPH-fortified rat liver microsomes oxidized N-nitroso-N-methylvinylamine to form 1,N6-epsilon-Ado in the presence of Ado. Further, 1,N6-epsilon-Ado was also formed in microsomal incubations containing N-nitroso-N-methylethylamine, indicating that desaturation of the ethyl moiety occurs to form a vinyl group and then an epoxide. When NADPH-fortified microsomes were incubated with N-nitroso-N-methylvinylamine, HCHO was formed, and when DNA was included in incubations, 1,N6-epsilon-dAdo and N7-methylGua were isolated from DNA. In the cases of both HCHO and N7-methylGua, product formation was similar to the levels seen with N-nitroso-N,N-dimethylamine and N-nitroso-N-methylethylamine.

PubMed ID: 8477007 Exiting the NIEHS site

MeSH Terms: Adenine/chemistry; Animals; Carcinogens/chemistry*; DNA/metabolism; Epoxy Compounds/chemistry; Guanine/chemistry; In Vitro Techniques; Magnetic Resonance Spectroscopy; Methylation; Microsomes, Liver/metabolism; Nitroso Compounds/chemistry*; Nitroso Compounds/metabolism; Oxidation-Reduction; Rats; Vinyl Compounds/chemistry*; Vinyl Compounds/metabolism

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