Quantification of DNA and Protein Adducts of 1-Nitropyrene: Significantly Higher Levels of Protein than DNA Adducts in the Internal Organs of 1-Nitropyrene Exposed Rats
作者:Wan Chan、Sum-Kok Wong、Weiwei Li
DOI:10.1021/acs.chemrestox.8b00035
日期:2018.8.20
1-Nitropyrene (1NP) level is closely associated with the mutagenicity of diesel exhaust and is being used as the marker molecule for diesel exhaust. Thus, quantitation of the exposure to 1NP may provide an efficient method for biomonitoring human exposure to diesel exhaust and risk assessment. Using ultra-performance liquid chromatography coupled with fluorescence or tandem mass spectrometric detection methods, we quantitated and compared in this study the DNA and protein adducts of 1NP in internal organs of 1NP-exposed rats. While previous studies using radioactivity-based detection methods were descriptive in nature and focused on the mutation-associated genetic materials, the results of our quantitative analysis showed, for the first time, a significantly higher concentration of the protein adduct than the DNA adduct in the tissue samples. The data also revealed higher in vivo stability of the protein adduct than that of the DNA adduct. Our results provide solid evidence that demonstrates that the protein adduct might be a more-sensitive dosimeter for 1-NP and, thus, diesel-exhaust exposure.
1-硝基苯芘(1NP)水平与柴油废气的致突变性密切相关,被用作柴油废气的标记分子。因此,定量检测 1NP 的暴露量可为人类暴露于柴油废气的生物监测和风险评估提供一种有效的方法。在本研究中,我们使用超高效液相色谱法结合荧光或串联质谱检测方法,对暴露于 1NP 的大鼠内脏中的 1NP DNA 和蛋白质加合物进行了定量和比较。以往使用基于放射性的检测方法进行的研究都是描述性的,重点关注与突变相关的遗传物质,而我们的定量分析结果首次显示,组织样本中蛋白质加合物的浓度明显高于 DNA 加合物。数据还显示,蛋白质加合物在体内的稳定性高于 DNA 加合物。我们的研究结果提供了确凿的证据,证明蛋白质加合物可能是一种对 1-NP 更敏感的剂量计,因此也是一种柴油废气暴露剂量计。