Ultrasensitive UPLC-MS-MS method for the quantitation of etheno-DNA adducts in human urine.

Ultrasensitive UPLC-MS-MS method for the quantitation of etheno-DNA adducts in human urine.
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DOI:
10.3390/ijerph111010902
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发表时间:
2014-10-21
影响因子:
--
通讯作者:
Sun X
Sun X
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Cui S;Li H;Wang S;Jiang X;Zhang S;Zhang R;Sun X

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乙烯基-DNA加合物是由外源性致癌物和内源性脂质过氧化代谢产生的。我们和其他人以前曾报道,1,N6-乙烯脱氧腺苷(εdA)和3,N4-乙烯脱氧胞苷(εdC)存在于人尿液中,可用作氧化应激的生物标志物。本文报道了一种超灵敏的超高效液相色谱-电喷雾串联质谱(UPLC-ESI-MS/MS)分析人尿中εdA和εdC的新方法,在1.0 mL人尿中分别检测到0.5 fmol εdA和0.3 fmol εdC。为了验证该方法,分析了20份人尿样,结果显示,血清中εdA和εdC(SD)fmol/μmol肌酐的平均水平为5.82 ± 2.11(范围3.0-9.5),εdA和791.4 ± 328.8职业性苯接触工人的εdC(范围116.7-1264.9)和2.10 ± 1.32非苯接触工人的ε dA为0.6-4.7,εdC为161.8 ± 200.9(1.8-557.5)。因此,超灵敏检测方法适用于人体生物监测和分子流行病学研究。
Etheno-DNA adducts are generated from the metabolism of exogenous carcinogens and endogenous lipid peroxidation. We and others have previously reported that 1,N6-ethenodeoxyadenosine (εdA) and 3,N4-ethenodeoxycytidine (εdC) are present in human urine and can be utilized as biomarkers of oxidative stress. In this study, we report a new ultrasensitive UPLC-ESI-MS/MS method for the analysis of εdA and εdC in human urine, capable of detecting 0.5 fmol εdA and 0.3 fmol εdC in 1.0 mL of human urine, respectively. For validation of the method, 20 human urine samples were analyzed, and the results revealed that the mean levels of εdA and εdC (SD) fmol/µmol creatinine are 5.82 ± 2.11 (range 3.0–9.5) for εdA and 791.4 ± 328.8 (range 116.7–1264.9) for εdC in occupational benzene-exposed workers and 2.10 ± 1.32 (range 0.6–4.7) for εdA and 161.8 ± 200.9 (range 1.8–557.5) for εdC in non-benzene-exposed workers, respectively. The ultrasensitive detection method is thus suitable for applications in human biomonitoring and molecular epidemiology studies.
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