血管扩散剂反应性氧物种改善了多种并发症的炼猪中心肌氧气供应扰乱的情况
R W A van Drie1,2, J van de Wouw1, L M Zandbergen1,3
1Division of Experimental Cardiology, Department of Cardiology, Thoraxcenter, Erasmus University Medical Center, PO Box 2040, 3000 CA, Rotterdam, The Netherlands.
Basic research in cardiology
|May 25, 2024
概括
在糖尿病,高脂肪饮食和慢性病中,反应性氧物种 (ROS) 作为冠状动脉微血管中的血管扩展剂. 在这种猪模型中,内甲素受体阻塞并没有改善心肌氧的氧气供应.
科学领域:
- 心血管生理学心血管生理学
- 脏生理学 脏生理学
- 代谢生理学 代谢生理学
背景情况:
- 诸如糖尿病 (DM),高脂肪饮食 (HFD) 和慢性病 (CKD) 等心血管并发症诱导冠状动脉微血管功能障碍.
- 这些情况导致全身炎症,氧化应激和内皮功能障碍,其特点是氧化 (NO) 生物可用性降低和内皮蛋白 (ET) 增加.
- 之前在猪身上进行的研究表明了这些影响,突出了这些并发症的复杂相互作用.
研究的目的:
- 调查反应性氧物种 (ROS) 清除和内甲素 (ET) A+B-受体阻塞对心肌氧气供应的治疗潜力.
- 阐明ROS的作用,特别是过氧化 (H2O2),在调节冠状动脉微血管音调中的作用.
- 评估DM,HFD和CKD联合对冠状动脉内皮功能和氧气供应的影响.
主要方法:
- 建立了一个雌性猪模型,诱导DM,HFD和CKD.
- 在体内研究涉及ROS清理 (TEMPOL + MPG) 和ETA+B-受体阻塞.
- 在体外线筋学被用来评估冠状动脉反应,心肌组织分析测量了酶活性和胺水平.
主要成果:
- 在DM+HFD+CKD猪中,ROS清理减少了心肌氧供应,表明内源ROS的血管扩张作用,包括H2O2.
- 实验室研究证实H2O2在DM+HFD+CKD猪的冠状动脉中起到血管扩张作用.
- ETA+B受体阻塞在对照或患病的猪中没有改变心肌氧的氧气供应,尽管ET-1水平升高.
结论:
- 在这个多重并发症模型中,增加的H2O2生产部分地弥补了NO生物可用性的损失,调解了冠状动脉血管扩张.
- 虽然ROS清理揭示了血管扩张作用,但并没有改善心肌氧的氧气供应,这表明存在复杂的调节机制.
- ETA+B-受体阻塞不是在这种特定条件下改善心肌氧输送的有效策略.
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