低剂量咖啡因暴露可以保护人类基因组免受电离辐射引起的损伤,并延长小鼠的寿命
Susmita Kumari1, Supriya V Vartak1, Sabita Tamang1
1Department of Biochemistry, Indian Institute of Science, Bangalore, India.
Molecular and cellular biology
|November 13, 2025
概括
在咖啡中发现的咖啡因通过减少DNA断裂和活性氧物种 (ROS) 来保护免受电离辐射 (IR) 损伤. 这种辐射保护作用提高了小鼠的生存率,突出的是咖啡因.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 辐射生物学 辐射生物学
背景情况:
- 咖啡是全球消费的饮料,咖啡因是其主要活性甲基丁化合物.
- 电离辐射 (IR) 由于DNA损伤和细胞应激,造成了严重的健康风险.
- 了解辐射保护剂对于减轻辐射引起的伤害至关重要.
研究的目的:
- 研究咖啡因对电离辐射的潜在辐射保护作用.
- 阐明咖啡因与辐射诱导的DNA损伤和细胞反应相互作用的分子机制.
- 评估咖啡因在提高临床前模型辐射后生存率方面的疗效.
主要方法:
- 在体外研究中,在咖啡因存在或不存在的情况下,暴露裸体等离子体DNA和寡合体DNA于IR.
- 细胞测试评估DNA断裂和G2/M捕获在暴露于IR或没有咖啡因的人类细胞.
- 使用NOS2淘汰赛 (KO) 和野生型 (WT) 鼠的体内研究,评估咖啡因治疗后IR后的生存率.
- 转录组分析以确定与抗氧化剂通路相关的基因表达变化.
主要成果:
- 咖啡因显著降低了无细胞DNA和人体细胞中IR诱导的DNA断裂,G2/M阻断最小.
- 咖啡因通过灭活性氧物种 (ROS) 证明了辐射保护.
- 与IR后的WT小鼠相比,咖啡因治疗导致NOS2KO小鼠的生存率显著提高.
- 转录组分析显示,咖啡因治疗小鼠中的关键抗氧化基因 (例如,Gpx3,Gpx7,Gpx4,Idh1) 的上调,特别是在NOS2 KO小鼠中.
结论:
- 咖啡因对电离辐射具有显著的辐射保护特性.
- 该机制涉及ROS火和内源抗氧化剂防御系统的上调.
- 咖啡因具有作为辐射保护剂的潜力,可减轻辐射引起的损伤并改善生存结果.
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