Department of Clinical Pharmacology, University of Toyama, Toyama, Japan.
Eur J Pharmacol. 2013 Feb 15;701(1-3):218-27. doi: 10.1016/j.ejphar.2012.12.027. Epub 2013 Jan 21.
Angiotensin II is the major effector in the renin-angiotensin system, and angiotensin II-induced oxidative stress and endothelial dysfunction are profoundly implicated in the pathogenesis of hypertension and cardiovascular disease. In the present study, we investigated the effect of an antioxidant reagent, coenzyme Q10, on angiotensin II-induced oxidative stress in human umbilical vein endothelial cells (HUVEC) to assess its potential usefulness for antioxidant therapy. Treatment of HUVEC with coenzyme Q10 (1-10μM) increased its intracellular levels in a concentration-dependent manner. Coenzyme Q10 (10μM) prevented the actions of angiotensin II (100nM): overproduction of reactive oxygen species, increases in expression of p22(phox) and Nox2 subunits of NADPH oxidase, and inhibition of insulin-induced nitric oxide production. In addition, coenzyme Q10 prevented angiotensin II-induced upregulation of intercellular adhesion molecule 1 (ICAM-1) and vascular cell adhesion molecule 1 (VCAM-1) in HUVEC, and inhibited their adhesion to U937 monocytic cells. Moreover, treatment of HUVEC with coenzyme Q10 effectively ameliorated angiotensin II-induced increases in expression of Nox2 subunit of NADPH oxidase, ICAM-1, and VCAM-1. These results provide the first in vitro evidence that coenzyme Q10 is an efficient antioxidant reagent to improve angiotensin II-induced oxidative stress and endothelial dysfunction, possibly relevant to the causes of cardiovascular disease.
血管紧张素 II 是肾素-血管紧张素系统中的主要效应物,血管紧张素 II 诱导的氧化应激和内皮功能障碍在高血压和心血管疾病的发病机制中起着重要作用。在本研究中,我们研究了抗氧化剂辅酶 Q10 对人脐静脉内皮细胞(HUVEC)中血管紧张素 II 诱导的氧化应激的影响,以评估其在抗氧化治疗中的潜在用途。辅酶 Q10(1-10μM)以浓度依赖性方式增加 HUVEC 中的细胞内水平。辅酶 Q10(10μM)可预防血管紧张素 II(100nM)的作用:活性氧的过度产生,NADPH 氧化酶的 p22(phox)和 Nox2 亚基表达增加,以及胰岛素诱导的一氧化氮产生抑制。此外,辅酶 Q10 可预防血管紧张素 II 诱导的 HUVEC 中细胞间黏附分子 1(ICAM-1)和血管细胞黏附分子 1(VCAM-1)的上调,并抑制其与 U937 单核细胞的黏附。此外,用辅酶 Q10 处理 HUVEC 可有效改善血管紧张素 II 诱导的 NADPH 氧化酶 Nox2 亚基、ICAM-1 和 VCAM-1 的表达增加。这些结果提供了第一个体外证据,表明辅酶 Q10 是一种有效的抗氧化剂试剂,可改善血管紧张素 II 诱导的氧化应激和内皮功能障碍,可能与心血管疾病的原因有关。