瑞因与铜离子的氧化还原相互作用而通过反应性氧物种的产生引起特定地点的DNA损伤
Yuichiro Hirao1, Hatasu Kobayashi2, Yurie Mori2
1Department of Environmental and Molecular Medicine, Mie University Graduate School of Medicine, Tsu, Mie, Japan; Department of Home Care Nursing, Mie Prefectural College of Nursing, Tsu, Mie, Japan.
与铜 (Cu) 结合的米瑞 (MYR) 通过氧化应激引起DNA损伤. 这种机制涉及过氧化和铜离子,导致DNA链断裂和基变化.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 毒理学 毒理学 毒理学
背景情况:
- 在植物中发现的一种黄胺Myricetin (MYR) 显示出预防阿尔茨海默氏症和癌症等疾病的潜力.
- 然而,MYR可以作为一种变异原体,导致DNA损伤,特别是在金属离子的存在下.
研究的目的:
- 研究在铜 (II) (MYR+Cu) 存在时由Myricetin诱导的DNA损伤的基础分子机制.
- 确定特定类型的DNA改变和参与MYR+Cu介导的基因毒性中的反应性物种.
主要方法:
- 使用32P-5'-end标记的DNA片段进行特定地点的DNA损伤分析.
- 量化8-oxo-7,8-dihydro-2'-deoxyguanosine (8-oxodG) 作为氧化DNA损伤的标志物在体外和细胞内.
- 使用特定的清除剂和具有差异H2O2抗性的细胞系评估反应性氧物种 (ROS) 的参与.
主要成果:
- MYR+Cu诱导了依赖度的DNA链断裂和基变化,主要是在氨酸,氨酸和关氨酸.
- 在小牛胸腺DNA中观察到8-oxodG的形成增加,与HP100细胞相比,在MYR处理的HL-60细胞中显著增加.
- DNA损伤并没有被氧基清理剂抑制,但被甲,甲酶和巴托库普洛因减少,表明H2O2,Cu(I) 和非氧基ROS的参与.
结论:
- 在Cu (I) /Cu (II) 反氧循环和MYR自氧化过程中,产生过氧化 (H2O2).
- 形成H2O2和Cu (I) 的复合物,可能是Cu (I) - 氧化物,它介导氧化DNA损伤.
- 这种机制突显了Myricetin与铜离子结合的基因毒性潜力.
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