Involvement of Kv1.5 protein in oxidative vascular endothelial cell injury.

Involvement of Kv1.5 protein in oxidative vascular endothelial cell injury.
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Kv1.5蛋白参与氧化性血管内皮细胞损伤

DOI:
10.1371/journal.pone.0049758
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Guan YY
Guan YY
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Chen WL;Huang XQ;Zhao LY;Li J;Chen JW;Xiao Y;Huang YY;Liu J;Wang GL;Guan YY

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与氧化应激相关的内皮损伤是高血压和动脉粥样硬化等心血管疾病的关键事件。氧化还原敏感的 Kv1.5 钾通道的激活介导血管平滑肌细胞和一些癌细胞中线粒体活性氧 (ROS) 诱导的细胞凋亡。因此Kv1.5通道被视为肺动脉高压和癌症的新的潜在治疗靶点。尽管 Kv1.5 在血管内皮中大量表达,但对其在氧化应激相关内皮损伤中的作用知之甚少。我们发现 DPO-1(Kv1.5 的一种特异性抑制剂)可在体内大鼠颈动脉模型中减弱 H2O2 诱发的内皮细胞凋亡。在人脐静脉内皮细胞 (HUVEC) 和人肺动脉内皮细胞 (HPAEC) 中,血管紧张素 II 和 oxLDL 时间或浓度依赖性增强 Kv1.5 蛋白表达,同时产生细胞内 ROS 和内皮细胞损伤。此外,siRNA介导的Kv1.5敲低减弱,而腺病毒介导的Kv1.5 cDNA过表达增强了oxLDL诱导的细胞损伤、NADPH氧化酶和线粒体衍生的ROS产生,并恢复了线粒体解偶联蛋白2(UCP2)蛋白表达的减少。总的来说,这些数据表明 Kv1.5 可能在氧化性血管内皮损伤中发挥重要作用。
Endothelial injury related to oxidative stress is a key event in cardiovascular diseases, such as hypertension and atherosclerosis. The activation of the redox-sensitive Kv1.5 potassium channel mediates mitochondrial reactive oxygen species (ROS)-induced apoptosis in vascular smooth muscle cells and some cancer cells. Kv1.5 channel is therefore taken as a new potential therapeutic target for pulmonary hypertension and cancers. Although Kv1.5 is abundantly expressed in vascular endothelium, there is little knowledge of its role in endothelial injury related to oxidative stress. We found that DPO-1, a specific inhibitor of Kv1.5, attenuated H2O2-evoked endothelial cell apoptosis in an in vivo rat carotid arterial model. In human umbilical vein endothelial cells (HUVECs) and human pulmonary arterial endothelial cells (HPAECs), angiotensin II and oxLDL time- or concentration-dependently enhanced Kv1.5 protein expression in parallel with the production of intracellular ROS and endothelial cell injury. Moreover, siRNA-mediated knockdown of Kv1.5 attenuated, whereas adenovirus-mediated Kv1.5 cDNA overexpression enhanced oxLDL–induced cellular damage, NADPH oxidase and mitochondria-derived ROS production and restored the decrease in protein expression of mitochondria uncoupling protein 2 (UCP2). Collectively, these data suggest that Kv1.5 may play an important role in oxidative vascular endothelial injury.
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