Liquid chromatography/mass spectrometry analysis of bifunctional electrophiles and DNA adducts from vitamin C mediated decomposition of 15-hydroperoxyeicosatetraenoic acid

Michelle V. Williams, Seon Hwa Lee, Ian A. Blair

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

Reactive oxygen species convert the ω-6 polyunsaturated fatty acid arachidonic acid into 15-hydroperoxy-5,8,11,13-(Z,Z,ZE)-eicosatetraenoic acid (15-HPETE). Cyclooxygenases and lipoxygenases can also convert arachidonic acid into 15-HPETE. Vitamin C mediated decomposition of 15(S)-HPETE to protein- and DNA-reactive bifunctional electrophiles was examined by normal-phase liquid chromatography/atmospheric pressure chemical ionization/mass spectrometry (LC/APCI-MS). The individual bifunctional electrophiles, trans-4,5-epoxy-2(E)- decenal (t-EDE), cis-4,5-epoxy-2(E)-decenal (c-EDE), 4-oxo-2(E)-nonenal (ONE), and 4-hydroxy-2(E)-nonenal (HNE), exhibited protonated molecules at m/z 169, 169, 155, and 157, respectively. The MH+ ion at m/z 173 for 4-hydroperoxy-2(E)-nonenal (HPNE) was very weak with an ion corresponding to the loss of OH at m/z 156 as the major ion in the APCI mass spectrum. The bifunctional electrophiles were all separated under normal-phase LC conditions. All five bifunctional electrophiles were formed when 15-HPETE was treated with vitamin C. The LC/MS-based methodology showed that t-EDE was the major bifunctional electrophile formed during vitamin C mediated 15(S)-HPETE decomposition. Stable isotope dilution LC/MS studies revealed that this did not result in the formation of increased levels of unsubstituted etheno-dGuo adducts in calf thymus DNA when compared with 13(S)-hydroperoxy-9,10-(Z,E)- octadecadienoic acid [13(S)-HPODE], a lipid hydroperoxide derived from linoleic acid. However, the formation of heptanone-etheno-dGuo adducts in calf thymus DNA was reduced when compared with the 13(S)-HPODE. This was attributed to the reduced formation of ONE from 15-HPETE when compared with its formation from 13-HPODE. In contrast to reactions with dGuo or DNA conducted using 13(S)-HPODE, no carboxy-containing adducts were observed with 15(S)-HPETE.

Original languageEnglish
Pages (from-to)849-858
Number of pages10
JournalRapid Communications in Mass Spectrometry
Volume19
Issue number6
DOIs
Publication statusPublished - 2005
Externally publishedYes

ASJC Scopus subject areas

  • Analytical Chemistry
  • Spectroscopy
  • Organic Chemistry

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