加速器质谱技术在DNA加合物检测中的应用
Application of accelerator mass spectrometry in studies of DNA adducts
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摘要: 大部分化学致癌物进入体内,或经代谢活化后,可与生物大分子——蛋白质或核酸形成共价相连的加合物,DNA加合物的形成是化学致癌过程中一个早期、可检测到的关键步骡。加速器质谱技术(accelemtor mass spectrometry,AMS)的DNA加合物检测,是目前最灵敏的检测方法,提供了人们研究低剂量效应的直接有力的手段。Abstract: Most chemical carcinogens,after intake,or after metabolic activation,can form covalent modifications of DNA(DNA adducts).DNA adducts formation induced by carcinogenic chemicals reflects exposure and is directly related to tumor formation.DNA adduct is a valid indicator of early key stage of carcinogenesis.Accelarator mass spectrometry (AMS) is a relatively new nuclear technique,has been developed for the detection of DNA adduct with great detection sensitivity.This powerful application allows studying molecular effects at the low-dose carcinogen exposure.
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Key words:
- accelerator mass spectrometer /
- DNA adduct /
- chemical carcinogens
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