Fast evaluation of oxidative DNA damage by liquid chromatography-electrospray tandem mass spectrometry coupled with precision-cut rat liver slices

To establish a fast and sensitive method for the detection of 8-hydroxy-2'-deoxyguanosine (8-OHdG) in precision-cut rat liver slices by HPLC-MS/MS and to investigate isoniazid (INH) -induced oxidative DNA damage. Precision-cut liver slices (300 microm) were prepared from male rats, and incubate...

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Bibliographic Details
Published inBiomedical and environmental sciences Vol. 20; no. 5; p. 386
Main Authors Yue, Jiang, Wang, Peng, Liu, Ying-Hui, Wu, Jun-Yu, Chen, Jie, Peng, Ren-Xiu
Format Journal Article
LanguageEnglish
Published China 01.10.2007
Subjects
Animals
Chromatography, Liquid
Deoxyguanosine - analogs & derivatives
Deoxyguanosine - analysis
DNA Damage - drug effects
Humans
Isoniazid - pharmacology
Liver - drug effects
Liver - metabolism
Male
Oxidative Stress - drug effects
Rats
Rats, Wistar
Sensitivity and Specificity
Spectrometry, Mass, Electrospray Ionization
Time Factors
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Summary:To establish a fast and sensitive method for the detection of 8-hydroxy-2'-deoxyguanosine (8-OHdG) in precision-cut rat liver slices by HPLC-MS/MS and to investigate isoniazid (INH) -induced oxidative DNA damage. Precision-cut liver slices (300 microm) were prepared from male rats, and incubated with INH (0.018 mol/L) for 2 h after 1 h preincubation. DNA in the slices was extracted and digested into free nucleosides at 37 degrees C. The samples were injected into HPLC-MS/MS after the proteins were removed. The level of oxidative DNA damage was estimated using the ratio of 8-OHdG to deoxyguanosine (dG). The limit of detection of 8-OHdG was 1 ng/mL (S/N=3) and the intra-assay relative standard variation was 3.38% when one transition 284.3/168.4 was used as a quantifier and another two transitions 284.3/140.2, 306.1/190.2 as qualifiers. 8-OHdG and dG were well separated, as indicated by elution at 10.02 and 7.37 min, respectively. INH significantly increased the ratio of 8-OHdG to dG in rat liver slices (P<0.05). 8-OHdG in precision-cut liver slices could be sensitively determined by HPLC-MS/MS. HPLC-MS/MS coupled with precision-cut tissue slices is a fast and reliable analytical technique to evaluate oxidative DNA damage of target tissues caused by procarcinogens and cytotoxins.
ISSN:0895-3988