期刊
REDOX BIOLOGY
卷 12, 期 -, 页码 226-232出版社
ELSEVIER
DOI: 10.1016/j.redox.2017.02.022
关键词
Vascular peroxidase 1; Endothelial nitric oxide synthase; Nitric oxide; Asymmetricdimethylarginine; Angiotensin II; Oxidative stress
资金
- National Youth Science Foundation of China [81102440]
- National Natural Science Fund of China [81170261]
- National Basic Research Program of China (973 Program) [2014CB542402]
- Natural Science Fund of Hunan Province [2016JJ2159]
- Postdoctor Fund of China [2013M542143]
Vascular peroxidase 1 (VPO1) is a member of the peroxidase family which aggravates oxidative stress by producing hypochlorous acid (HOCl). Our previous study demonstrated that VPO1 plays a critical role in endothelial dysfunction through dimethylarginine dimethylaminohydrolase2 (DDAH2)/asymmetric Dimethylarginine (ADMA) pathway. Hereby we describe the regulatory role of VPO1 on endothelial nitric oxide synthase (eNOS) expression and activity in human umbilical vein endothelial cells (HUVECs). In HUVECs AngiotensinII (100 nM) treatment reduced Nitric Oxide (NO) production, decreased eNOS expression and activity, which were reversed by VPO1 siRNA. Knockdown of VPO1 also attenuated ADMA production and eNOS uncoupling while enhancing phosphorylated ser1177 eNOS expression level. Furthermore, HOCl stimulation was shown to directly induce ADMA production and eNOS uncoupling, decrease phosphorylated ser1177 eNOS expression. It also significantly suppressed eNOS expression and activity together with NO production. Therefore, VPO1 plays a vital role in regulating eNOS expression and activity via hydrogen peroxide (H2O2)-VPO1-HOCl pathway.
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