在小鼠和肝脏中由阿弗拉托克素B诱导的DNA adduct形成
Pawel Jaruga1, Vladimir L Vartanian2, Irina G Minko2
1Biomolecular Measurement Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
Environmental toxicology and pharmacology
|January 30, 2025
概括
甲素B1的DNA附加物在脏中形成,但水平低于肝脏. 这项研究挑战了反应性氧物种驱动急性偏素诱导的损伤的想法.
科学领域:
- 毒理学 毒理学 毒理学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 由于摄入亚毒素而引起的亚毒毒症是一种严重的疾病,影响脏和肝脏.
- 长期暴露于青毒素与肝癌的风险增加有关.
- 偏素诱导的毒性确切机制尚未完全理解.
研究的目的:
- 为了研究脏组织中阿弗拉托辛B1 (AFB1) DNA添加物的形成.
- 为了比较和肝脏中的AFB1 adduct水平.
- 评估活性氧物种在AFB1诱导的毒性中的作用.
主要方法:
- 利用先进的质谱技术来检测AFB1的DNA添加物.
- 从暴露动物的脏和肝脏组织中量化AFB1 adducts.
- 测量了氧化诱导的DNA基损伤,以评估活性氧物种的参与.
主要成果:
- 在脏组织中检测到AFB1DNA添加物,虽然比肝脏低约100倍.
- 细胞染色体P450表达的组织特异可能会影响AFB1激活.
- 没有发现反应性氧物种对基因毒性DNA基损害的证据,这挑战了现有的假设.
结论:
- AFB1确实在中形成DNA附加物,表明直接相互作用.
- 脏中较低的 adduct 水平表明与肝脏相比,代谢激活的差异.
- 这些发现不支持反应性氧物种作为急性亚法托克辛诱导毒性的主要机制.
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