线粒体ROS和除基的修复步骤导致DNA形成驱动紫外线诱导的NETosis
Dhia Azzouz1,2, Nades Palaniyar1,2,3
1Translational Medicine, Peter Gilgan Center for Research and Learning, The Hospital for Sick Children, Toronto, ON, Canada.
Frontiers in immunology
|June 23, 2023
概括
紫外线 (UV) 辐射会导致线粒体的活性氧物种 (ROS) 损伤DNA,通过DNA修复途径启动中性粒体细胞外陷形成 (NETosis). 这揭示了一种独立于NADPH氧化酶的UV诱导NETosis的新机制.
科学领域:
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
- 生物化学 生物化学
背景情况:
- 反应性氧物种 (ROS) 对中性粒细胞外细胞陷形成 (NETosis) 至关重要.
- 线粒体和NADPH氧化酶是中性粒细胞中ROS的主要来源.
- 紫外线 (UV) 辐射诱导线粒体ROS并促进NETosis,但潜在的机制尚不清楚.
研究的目的:
- 阐明ROS执行紫外线诱导NETosis的机制.
- 调查氧化DNA损伤和维修途径在UV介导NETosis中的作用.
主要方法:
- 使用Mitosox. 的线粒体ROS检测.
- 通过SYTOX染色和免疫细胞化学进行NETosis评估.
- 对DNA氧化过程中的8-oxyguanine (8-oxoG) 的对焦成像.
- 免疫光显微镜用于DNA修复蛋白质定位.
- 基本切除修复 (BER) 路径组件的抑制.
主要成果:
- 紫外线辐射产生了线粒体ROS,其抑制抑制了NETosis.
- 紫外线辐射导致了广泛的DNA氧化,由NET中8-oxoG积累证明.
- 基切除修复 (BER) 途径是活跃的,早期步骤 (直到DNA切割) 对UV诱导的NETosis至关重要.
结论:
- 由紫外线辐射引起的高线粒体ROS水平会导致显著的氧化DNA损伤.
- 在BER路径的早期阶段,导致DNA断,触发染色质脱凝和随后的NETosis.
- 这项研究揭示了由紫外线辐射和线粒体ROS引起的ROS介导NETosis的新NOX独立途径.
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