性别和基丁DNA糖酶表达是NDMA诱导的突变,毒性和癌症的关键敏感性因素
Jennifer E Kay1,2, Joshua J Corrigan1, Lindsay B Volk1
1Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139.
bioRxiv : the preprint server for biology
|June 4, 2025
概括
男人更容易患上NDMA诱导的肝癌和突变,而AAG缺乏和男性性是关键的危险因素. 过度表达AAG会增加毒性,可能会更严重地影响女性.
科学领域:
- 毒理学 毒理学 毒理学
- 遗传学 是一个遗传学.
- 致癌的发生是致癌的产生.
背景情况:
- 尼二甲胺 (NDMA) 是一种在各种来源中发现的可能的人类致癌物.
- NDMA通过甲基损伤诱导DNA损伤,主要是3-甲基氨酸 (3MeA).
- 基氨酸DNA糖酶 (AAG) 启动3MeA的DNA修复,但中间步骤可能导致DNA断裂.
研究的目的:
- 在暴露于NDMA后,研究DNA损伤,毒性,突变和癌症的性别特异性.
- 阐明阿基拉丁氨酸DNA糖酶 (AAG) 在与性相关的易感性 NDMA 诱导的肝癌中的作用.
主要方法:
- 使用了野生型 (WT),Aag淘汰 (Aag-/-),以及Aag过度表达 (AagTg) 的小鼠.
- 在暴露于NDMA的雄性和雌性小鼠中评估肝脏DNA损伤,微核诱导,突变和瘤形成.
主要成果:
- 在所有基因型中,男性对NDMA诱导的突变和肝癌的敏感性更高.
- 与男性相比,AagTg女性的微核诱导增加.
- 鉴定出Aag缺乏和男性性别是NDMA诱导的肝癌的易感因素.
结论:
- 男性性别和AAG缺乏症增加了对NDMA诱导的肝癌的易感性.
- 过度表达AAG有助于毒性,对女性的影响可能更大.
- 这项研究提供了对男性比女性肝癌发病率更高的机制性见解.
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