在子[a]烯上位置特定的甲基替代驱动斑马鱼的AHR依赖性重复
Mackenzie L Morshead1, Lisa Truong1, Robyn L Tanguay1
1Sinnhuber Aquatic Research Laboratory, Department of Environmental and Molecular Toxicology, Oregon State University.
概括
在多环芳 (PAHs) 中的基替代显著改变了毒性. 具体来说,8-甲基[a]烯 (8-MBaP) 会导致斑马鱼的独特形态缺陷,与其母化合物[a]烯 (BaP) 不同.
科学领域:
- 环境毒理学环境毒理学
- 发展生物学 发展生物学
- 化学致癌发生的原因
背景情况:
- 多环芳 (PAH) 是由于不完全燃烧而引起的广泛存在的环境污染物.
- 研究和监管主要集中在母PAHs上,忽视了基替代变体的显著毒性.
- 基替代,特别是甲 (BaP) 的8位,对生物活性和毒理学结果产生深远影响.
研究的目的:
- 描述8-甲基[a] (8-MBaP) 在斑马鱼发育中的特定形态效应.
- 阐明8-MBaP诱导毒性背后的分子机制,包括遗传依赖性和保护性途径.
- 为了确定与8-MBaP暴露相关的度依赖的转录基因变化及其独特的毒理特征.
主要方法:
- 从受精后6小时开始,将斑马鱼幼虫暴露在不同度的BaP,6-MBaP和8-MBaP中.
- 现型分析以确定形态缺陷,重点关注翅膀重复和其他发育异常.
- 利用Ahr2和Cyp1a淘汰赛斑马鱼系来研究这些基因在8-MBaP毒性中的作用.
- 在受精后48小时和72小时对整个胚胎/的RNA测序,以捕捉表型出现前和期间的转录基因反应.
主要成果:
- 8-MBaP在比BaP低得多的度下引起了显著的形态缺陷,包括翅膀重复,比BaP低得多.
- 8-MBaP的毒性取决于基碳化合物受体2 (Ahr2) 途径,而Cyp1a则表现出一种保护作用.
- 转录组分析揭示了8-MBaP与其独特的形态现象型相关的独特,度依赖的基因表达模式.
- 其他位置异构体 (7-, 6-, 9-,和10-MBaP) 在可比度下不会引起类似的形态效应.
结论:
- 在BaP上基替代的位置是其毒性和作用机制的关键决定因素.
- 与BaP相比,8-MBaP是一个强大的环境危害,与BaP相比,它具有不同的作用模式.
- 这项研究提高了对PAH混合物毒性的理解,为更准确的环境和人类健康风险评估提供了信息.
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