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Simultaneous determination of 8‐oxo‐2′‐deoxyguanosine and 8‐oxo‐2′‐deoxyadenosine in DNA using online column‐switching liquid chromatography/tandem mass spectrometry
Author(s) -
Singh Rajinder,
Teichert Friederike,
Verschoyle Richard D.,
Kaur Balvinder,
Vives Montserrat,
Sharma Ricky A.,
Steward William P.,
Gescher Andreas J.,
Farmer Peter B.
Publication year - 2009
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.3866
Subject(s) - chemistry , deoxyguanosine , chromatography , adduct , tandem mass spectrometry , dna , mass spectrometry , deoxyadenosine , liquid chromatography–mass spectrometry , detection limit , dna adduct , biochemistry , organic chemistry
Sensitive and reliable methods are required for the assessment of oxidative DNA damage, which can result from reactive oxygen species that are generated endogenously from cellular metabolism and inflammatory responses, or by exposure to exogenous agents. The development of a liquid chromatography/tandem mass spectrometry (LC/MS/MS) selected reaction monitoring (SRM) method is described, that utilises online column‐switching valve technology for the simultaneous determination of two DNA adduct biomarkers of oxidative stress, 8‐oxo‐7,8‐dihydro‐2′‐deoxyguanosine (8‐oxodG) and 8‐oxo‐7,8‐dihydro‐2′‐deoxyadenosine (8‐oxodA). To allow for the accurate quantitation of both adducts the corresponding [ 15 N 5 ]‐labelled stable isotope internal standards were synthesised and added prior to enzymatic hydrolysis of the DNA samples to 2′‐deoxynucleosides. The method required between 10 and 40 µg of hydrolysed DNA on‐column for the analysis and the limit of detection for both 8‐oxodG and 8‐oxodA was 5 fmol. The analysis of calf thymus DNA treated in vitro with methylene blue (ranging from 5 to 200 µM) plus light showed a dose‐dependent increase in the levels of both 8‐oxodG and 8‐oxodA. The level of 8‐oxodG was on average 29.4‐fold higher than that of 8‐oxodA and an excellent linear correlation (r = 0.999) was observed between the two adducts. The influence of different DNA extraction procedures for 8‐oxodG and 8‐oxodA levels was assessed in DNA extracted from rat livers following dosing with carbon tetrachloride. The levels of 8‐oxodG and 8‐oxodA were on average 2.9 ( p = 0.018) and 1.4 ( p = 0.018) times higher, respectively, in DNA samples extracted using an anion‐exchange column procedure than in samples extracted using a chaotropic procedure, implying artefactual generation of the two adducts. In conclusion, the online column‐switching LC/MS/MS SRM method provides the advantages of increased sample throughput with reduced matrix effects and concomitant ionisation suppression, making the method ideally suited when used in conjunction with chaotropic DNA extraction for the determination of oxidative DNA damage. Copyright © 2008 John Wiley & Sons, Ltd.