胚胎氧化DNA损伤,胚胎病变和神经发育障碍的BRCA1蛋白剂量依赖风险,无论是否暴露于乙醇
Danielle M Drake1, Kian Afsharian1, Benjamin Or2
1Department of Pharmaceutical Sciences and Centre for Pharmaceutical Oncology, Faculty of Pharmacy, University of Toronto, Toronto, Ontario, Canada.
Redox biology
|February 15, 2024
概括
降低的BRCA1蛋白水平增加了对来自氧化应激的发育障碍的易感性. 即使是轻微的BRCA1缺陷也会导致胎儿DNA损伤和胚胎病变,特别是当暴露于酒精 (乙醇) 时.
科学领域:
- 发展生物学 发展生物学
- 遗传学 遗传学 是一个
- 毒理学 毒理学 毒理学
背景情况:
- 乳腺癌1敏感性蛋白 (BRCA1) 对于DNA修复和发育至关重要.
- BRCA1 缺陷可能会损害对反应性氧物种 (ROS) 和DNA损伤的胎儿保护.
- 之前的研究表明,BRCA1缺乏会加剧酒精诱导的胚胎病变.
研究的目的:
- 研究BRCA1缺陷对发育障碍的剂量依赖性影响.
- 为了比较不同BRCA1淘汰模型对氧化应激和酒精暴露的易感性.
- 在BRCA1缺乏的小鼠中描述学习,记忆和运动协调缺陷.
主要方法:
- 使用条件异合体 (+/-) 淘汰赛 (cKO) 和直接Brca1 +/-淘汰赛 (KO) 的小鼠模型.
- 暴露的胚胎和孕妇暴露于酒精 (乙醇,EtOH) 和盐水.
- 在体内评估了氧化DNA损伤,培养胚胎病变以及学习/记忆/运动缺陷.
主要成果:
- 直接KO模型显示了比cKO (28%) 更大的BRCA1减少 (58%).
- 暴露于盐水中的Brca1 +/- KO后代表现出氧化DNA损伤和学习缺陷,与cKO不同.
- 酒精诱导的胚胎病变更严重,在直接的KO胚胎中发生的度更低.
- 在暴露于EtOH的Brca1 +/- KO后代中观察到运动协调缺陷.
结论:
- 由于氧化应激,BRCA1蛋白水平对发育障碍的敏感性是剂量依赖的.
- 在存在显著的BRCA1缺陷的情况下,生理ROS水平可能是致病的.
- 这项研究提供了BRCA1对氧化应激引起的发育障碍的剂量依赖敏感性的第一个证据.
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