在溶酶体条件下氧化低密度脂蛋白降低了动脉血管扩张
Hadeel K M Alboaklah1,2, Alister J McNeish3, David S Leake1
1School of Biological Sciences and Institute of Cardiovascular and Metabolic Research, University of Reading, Reading, UK.
Free radical research
|September 13, 2024
概括
低密度脂蛋白 (LDL) 在巨细胞内被铁氧化,可以损害血管放松. 这种氧化的LDL增加了活性氧物种,可能导致动脉样硬化中的内皮功能障碍.
科学领域:
- 心血管生物学 心血管生物学
- 内皮细胞功能 内皮细胞功能
- 动脉样硬化研究 动脉样硬化研究
背景情况:
- 内皮功能障碍,其特点是血管扩张受损,是动脉样硬化的主要危险因素.
- 动脉样硬化病变内的巨细胞可以内化和氧化低密度脂蛋白 (LDL).
- 大细胞溶解可能会释放氧化LDL,可能会损害内皮细胞.
研究的目的:
- 研究巨细胞衍生氧化LDL对内皮细胞和血管功能的功能影响.
- 为了确定氧化LDL是否会影响内皮依赖血管扩张和氧化的生物可用性.
- 探索氧化LDL在大动脉组织和内皮细胞中反应性氧物种生产中的作用.
主要方法:
- 在特定的实验室条件下使用硫酸铁的LDL氧化.
- 导线肌图测量大鼠大动脉环中的同度张力和血管扩张.
- 化大动脉环和培养的人体内皮细胞与氧化LDL.
- 测量反应性氧物种 (ROS) 的形成和内皮氧化合成酶 (eNOS) 的酸化.
主要成果:
- 氧化LDL显著降低了大约50%的内皮依赖性放松,大鼠大动脉环.
- 内皮独立的血管扩张受氧化LDL的影响较小.
- 氧化LDL增加了大动脉环和内皮细胞中反应性氧物种 (ROS) 的形成.
- 氧化LDL对人类大动脉内皮细胞中乙胆诱导的eNOS酸化的影响很小.
结论:
- 在巨细胞内氧化并在细胞溶解时释放的LDL可能会导致动脉样硬化动脉血管扩张受损.
- 氧化LDL增加ROS的产生可能在氧化氧化氧化物失活和内皮功能障碍中起作用.
- 这些发现突出了一个潜在的机制,将巨细胞活动和氧化LDL与动脉样硬化中的血管病理联系起来.
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