NAD+作为细胞应激反应对DNA化剂的保护因子
Joanna Ruszkiewicz1, Ylea Papatheodorou1, Nathalie Jäck1
1Molecular Toxicology Group, Department of Biology, University of Konstanz, 78457 Konstanz, Germany.
Cells
|October 13, 2023
概括
尼古丁胺 рибоoside (NR) 补充剂没有保护人体角质细胞免受硫子衍生毒性. 然而,NR在单细胞样细胞中表现出保护作用,突出显示了细胞对NAD+的特异反应,从而增加了基因毒性.
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 生化学
背景情况:
- 硫 (SM) 和其衍生品是基因毒剂,可以耗尽尼古丁胺胺氨基二核酸 (NAD+).
- NAD+对DNA修复和基因组完整性至关重要,这表明NAD+补充可以减轻SM诱导的毒性.
研究的目的:
- 调查NAD+耗尽和升高对SM衍生物 (CEES和HN2) 的反应中的作用.
- 为了评估NAD+增强剂尼古丁胺胺 рибоoside (NR) 和NAD+合成抑制剂FK866在人类角质细胞 (HaCaT) 和单细胞类 (THP-1) 细胞系中的疗效.
主要方法:
- 用CEES和HN2.2处理HaCaT和THP-1细胞.
- 用NR来增加NAD+水平和FK866来抑制NAD+合成.
- 对NAD+水平,多 (ADP-ribose) (PAR) 反应,ATP水平,DNA损伤修复和细胞毒性的分析.
主要成果:
- 在HaCaT细胞中,NR增加了NAD+和PAR反应,但没有改善DNA修复或减少细胞毒性.
- FK866使HaCaT细胞对CEES敏感,而NR则部分挽救了这种敏感性.
- 在THP-1细胞中,NR减弱了SM衍生物,特别是CEES的毒性.
结论:
- NAD+在SM衍生物的病理机制中起着重要作用,具有化合物特异性的作用.
- NR的保护作用取决于细胞系,这表明NAD+增强剂的系统特定适用性.
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