Characterization of a Lipid Hydroperoxide-derived RNA Adduct in Rat Intestinal Epithelial Cells

Overview

Journal Chem Res Toxicol

Publisher American Chemical Society

Specialty Toxicology

Date 2006 Jun 20

PMID 16780360

Citations 10

Authors

Peijuan Zhu

Seon Hwa Lee

Suzanne Wehrli

Ian A Blair

Affiliations

Soon will be listed here.

Abstract

Five major products (adducts A(1a), A(1b), A(2), A(3,) and B) from the reaction of guanosine (Guo) with 4-oxo-2(E)-nonenal (ONE) were detected by liquid chromatography-mass spectrometry (LC-MS). Tandem MS (MS/MS) analysis of these compounds suggested that modifications to the nucleoside had been introduced. Adducts A(1a), A(1b), A(2), and A(3) were heptanone-ethano-2'-Guo adducts that all decomposed to adduct B. Adducts A(1a) and A(1b) were isomeric hemi-ketal forms. Adducts A(2) and A(3) were diastereomers of the open chain ketone form. The structure of adduct B was shown by LC-MS/MS and NMR spectroscopy to be the heptanone-etheno-Guo (HepsilonGuo) adduct, 3-(D-erythropentafuranosyl)imidazo-7-(heptane-2' '-one)-9-hydroxyl[1,2-alpha]purine. The overall reaction of Guo with ONE was very similar to its reaction with 2'-deoxyguanosine. Reaction of ONE with yeast transfer RNA also resulted in the formation of HepsilonGuo. Finally, HepsilonGuo was detected and quantified in the RNA from rat intestinal epithelial cells that stably express cyclooxygenase-2. These data show that RNA is modified by the same bifunctional reactive electrophiles derived from lipid peroxidation that covalently modify DNA.

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