Formation of deoxyguanosine cross-links from calf thymus DNA treated with acrolein and 4-hydroxy-2-nonenal

Ivan D. Kozekov, Robert J. Turesky, Guillermo R. Alas, Constance M. Harris, Thomas M. Harris, Carmelo J. Rizzo

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

Acrolein (AC) and 4-hydroxy-2-nonenal (HNE) are endogenous bis-electrophiles that arise from the oxidation of polyunsaturated fatty acids. AC is also found in high concentrations in cigarette smoke and automobile exhaust. These reactive α,β-unsaturated aldehyde (enal) covalently modify nucleic acids, to form exocyclic adducts, where the three-carbon hydroxypropano unit bridges the N1 and N2 positions of deoxyguanosine (dG). The bifunctional nature of these enals allows them to undergo reaction with a second nucleophilic group and form DNA cross-links. These cross-linked enal adducts are likely to contribute to the genotoxic effects of both AC and HNE. We have developed a sensitive mass spectrometric method to detect cross-linked adducts of these enals in calf thymus DNA (CT DNA) treated with AC or HNE. The AC and HNE cross-linked adducts were measured by the stable isotope dilution method, employing a linear quadrupole ion trap mass spectrometer and consecutive reaction monitoring at the MS3 or MS4 scan stage. The lower limit of quantification of the cross-linked adducts is ∼1 adduct per 108 DNA bases, when 50 μg of DNA is assayed. The cross-linked adducts occur at levels that are ∼1-2% of the levels of the monomeric 1,N2-dG adducts in CT DNA treated with either enal.

Original languageEnglish (US)
Pages (from-to)1701-1713
Number of pages13
JournalChemical research in toxicology
Volume23
Issue number11
DOIs
StatePublished - Nov 15 2010

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