尼古丁的吸入和新陈代谢会触发AOX介导的超氧化物生成,并导致氧化性肺损伤
Jay L Zweier1, Tapan Kundu1, Mahmoud S Eid1
1Division of Cardiovascular Medicine, and the EPR Center, Department of Internal Medicine, Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University, Columbus, Ohio, USA.
The Journal of biological chemistry
|August 4, 2024
概括
电子烟中的高尼古丁含量 (NIC) 可以导致肺损伤. 尼克代谢触发超氧化物生成通过阿尔代氧化酶 (AOX),导致氧化性肺损伤,特别是在慢性vaping.
科学领域:
- 生物化学 生物化学
- 毒理学 毒理学 毒理学
- 肺部病理学 肺部病理学
背景情况:
- 电子烟设备提供高尼古丁 (NIC) 水平,与零星的肺损伤有关.
- 尼克代谢产生可能导致毒性的中间体.
- 氧化酶 (AOX) 会将NIC iminium (NICI) 代谢成.
研究的目的:
- 调查NIC代谢产品是否会在肺部引发氧化应激.
- 为了确定氧化酶 (AOX) 在NIC引起的肺损伤中的作用.
- 评估慢性电子烟暴露对AOX表达和功能的影响.
主要方法:
- 通过NICI在AOX的存在下使用cytochrome-c降解和EPR回旋捕获刺激的测量超氧化物生成.
- 在长期接触电子烟后,在小鼠肺部评估了AOX表达.
- 评估了NIC或NICI刺激的超氧化物产生的小鼠肺和氧化性肺损伤后,电子烟暴露,有或没有AOX抑制.
主要成果:
- 在AOX的存在下,NICI强烈触发超氧化物生成 (Km = 2.7 μM,Vmax = 794 nmol/min/mg).
- 在老鼠中,慢性使用电子烟显著增加了肺部的AOX表达.
- 电子烟中介的NIC输送诱导了氧化性肺损伤,由AOX抑制减弱.
结论:
- NIC代谢,特别是NICI,通过AOX产生超氧化物,导致肺氧化应激.
- 慢性蒸汽后肺部增加的AOX表达和活性加剧了NIC诱导的氧化损伤.
- 电子烟的高,不受控制的尼古丁吸入会导致严重的氧化性肺损伤.
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