在apoE缺乏的小鼠中血管运动的内皮调节:对过氧酸盐和四基生物素之间的相互作用的影响
J B Laursen1, M Somers, S Kurz
1Department of Medicine, Emory University School of Medicine, and Veterans Administration Hospital, Atlanta, GA 30322, USA.
Circulation
|March 10, 2001
概括
反应性氧物种,特别是过氧酸盐,通过降解四二烯,氧化合成酶的关键辅因子,损害动脉样硬化中的血管放松. 这种解机制有助于内皮功能障碍.
科学领域:
- 血管生物学 血管生物学
- 生物化学 生物化学
- 心血管研究的心血管研究.
背景情况:
- 内皮氧化 (NO) 生产对血管健康至关重要.
- 动脉样硬化与NO的生物可用性降低和超氧化物产生增加有关.
- 甲基生物素 (BH4) 是NO合成酶 (NOS) 的关键辅因子.
研究的目的:
- 为了研究减少BH4和增加超氧化物在内皮功能障碍之间的关系.
- 确定过氧酸盐的形成是否有助于BH4耗尽和血管扩张受损.
主要方法:
- 在apoE缺陷小鼠的大动脉中评估内皮依赖血管扩张.
- 测量了使用 lucigenin 的血管超氧化物产量.
- 评估了超氧化物脱酶和分离对血管扩张的影响.
- 在超氧化物和过氧酸盐的存在下监测了四基的衰变.
- 测量了醇化学发光,并评估了尿酸对血管扩张的影响.
主要成果:
- 缺乏ApoE的小鼠表现出血管扩张受损和超氧化物产生增加.
- 超氧化物松酶和分离在apoE缺乏的小鼠中改善了血管扩张.
- 过氧尼酸盐,但不是过氧化,显著增加了四生物的衰变.
- 尿酸在apoE缺乏的小鼠中改善了血管扩张,这表明过氧酸的参与.
- 外源性过氧酸盐以NOS-依赖的方式增加了超氧化物生产.
结论:
- 反应性氧物种,特别是过氧酸盐,通过氧化四二二来促进内皮功能障碍.
- 过氧酸诱导的四基胺氧化导致NO合成酶的"脱".
- 这种机制代表了与动脉样硬化相关的血管功能障碍的发病过程中的新途径.
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