Redox Biol :Nox2与高胰岛素血症引起的血管功能受损和氧化还原功能紊乱相关

2017-06-20 Emma MedSci原创

抗胰岛素性会引起血管内皮功能障碍,进而引起心血管疾病。在以前的研究中,研究人员发现健康成人高胰岛素钳夹后,FID(骨骼肌小动脉血流扩张)减少。因此,研究人员将血胰岛素高假设为抗胰岛素的标志,并且推测其与由Nox系统(NADPH氧化酶系统)介导的氧化应激引起的微血管内皮细胞功能障碍有关。

胰岛素抗性会引起血管内皮功能障碍,进而引起心血管疾病。在以前的研究中,研究人员发现健康成人高胰岛素钳夹后,FID(骨骼肌小动脉血流扩张)减少。因此,研究人员将血胰岛素高假设为抗胰岛素的标志,并且推测其与由Nox系统(NADPH氧化酶系统)介导的氧化应激引起的微血管内皮细胞功能障碍有关。研究人员检测了与人类高胰岛素血症相当水平下的胰岛素下,在Nox抑制剂存在和不存在时,从人骨骼肌组织分离小动脉的FID;NO(一氧化氮),eNOS(内皮NO合成酶)和Nox介导的氧化应激下,HAMECs(人体脂肪微血管内皮细胞)的表达情况。

结果显示,高胰岛素血症会损害FID并在人肌肉小动脉中诱导ROS产生;内皮细胞中胰岛素诱导产生的ROS由NADPH氧化酶介导;长期暴露于高胰岛素水平会降低eNOS磷酸化和NO的产生。高胰岛素血症通过在微血管内皮细胞中诱导Nox2介导的超氧化物产生降低FID,可能的过程是在微血管内皮细胞中诱导Nox2介导的超氧化物产生,降低了NO的利用率,增强了过氧亚硝酸盐的形成,从而降低FID。

其中,有6名参与者(平均年龄25.5±1.6岁,BMI21.8±0.9),ROS(活性氧)增加,NO和小动脉FID在体外胰岛素孵育60分钟后降低,而与Nox2抑制剂VAS2870共同孵育后结果相反。在HAMECs中,随着超氧化物产生的增多,Nox2表达的胰岛诱导的时间依赖性增加且P47phox磷酸化增加。相反,eNOS的磷酸化和超氧化物歧化酶(SOD2和SOD3)异构体的表达在较早的时间点显示出表达增加的双相反应,之后急剧下降。胰岛素诱导的eNOS解偶联与NO下降和ROS产生激增同步,而这些作用又能被Tempol(SOD模拟物)、BH4、eNOS辅因子和VAS2870逆转。最后,由于NO和超氧化物的产生受到抑制,胰岛素诱导的硝基酪氨酸形成被逆转。

原始出处:
Abeer M. Mahmoud, et al. Nox2 contributes to hyperinsulinemia-induced redox imbalance and impaired vascular function. Redox Biol. 2017 Jun 3;13:288-300. doi: 10.1016/j.redox.2017.06.001.

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    2018-01-03 sunylz
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    2018-03-23 baoya
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