Formation of a substituted 1,N(6)-etheno-2'-deoxyadenosine adduct by lipid hydroperoxide-mediated generation of 4-oxo-2-nonenal.
Analysis of the reaction between 2'-deoxyadenosine and 13-hydroperoxylinoleic acid by liquid chromatography/constant neutral loss mass spectrometry revealed the presence of two major products (adducts A and B). Adduct A was shown to be a mixture of two isomers (A(1) and A(2)) that each decomposed with the loss of water to form adduct B. The mass spectral characteristics of adduct B were consistent with the substituted 1, N(6)-etheno-2'-deoxyadensoine adduct 1' '-[3-(2'-deoxy-beta-D-erythro-pentafuranosyl)-3H-imidazo[2, 1-i]purin-7-yl]heptan-2' '-one. Adducts A(1), A(2), and B were formed when 2'-deoxyadenosine was treated with synthetic 4-oxo-2-nonenal, which suggested that it was formed by the breakdown of 13-hydroperoxylinoleic acid. A substantial increase in the rate of formation of adducts A(1), A(2), and B was observed when 13-hydroperoxylinoleic acid and 2'-deoxyadenosine were incubated in the presence of Fe(II). Thus, 4-oxo-2-nonenal was most likely formed by a homolytic process. Although adducts A(1), A(2), and B were formed in the reaction between 4-hydroxy-2-nonenal and 2'-deoxyadenosine, a number of additional products were observed. This suggested that 4-hydroxy-2-nonenal was not a precursor in the formation of 4-oxo-2-nonenal from 13-hydroperoxylinoleic acid. This study has provided additional evidence which shows that 4-oxo-2-nonenal is a major product of lipid peroxidation and that it reacts efficiently with DNA to form substituted etheno adducts.
Rindgen
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Center for Cancer Pharmacology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104-6160, USA.
Lee
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Nakajima
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Blair
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D000447:Aldehydes / Q000737:chemistry*; D000818:Animals; D002417:Cattle; D002851:Chromatography, High Pressure Liquid; D018736:DNA Adducts; D003839:Deoxyadenosines / Q000737:chemistry*; D008041:Linoleic Acids / Q000737:chemistry*; D015227:Lipid Peroxidation; D013058:Mass Spectrometry
C403894:4-oxo-2-nonenal; D000447:Aldehydes; D018736:DNA Adducts; D003839:Deoxyadenosines; D008041:Linoleic Acids; C032221:1,N(6)-ethenodeoxyadenosine; C032890:13-hydroperoxylinoleic acid