Telmisartan activates endothelial nitric oxide synthase via Ser1177 phosphorylation in vascular endothelial cells.

Telmisartan activates endothelial nitric oxide synthase via Ser1177 phosphorylation in vascular endothelial cells.
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DOI:
10.1371/journal.pone.0096948
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发表时间:
2014
期刊:
影响因子:
3.7
通讯作者:
Hirata Y
Hirata Y
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Myojo M;Nagata D;Fujita D;Kiyosue A;Takahashi M;Satonaka H;Morishita Y;Akimoto T;Nagai R;Komuro I;Hirata Y

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由于内皮型一氧化氮合酶(eNOS)具有抗炎和抗动脉粥样硬化的功能,它已被认为是除舒张血管张力之外的血管稳态控制的关键分子之一。在这里,我们研究了替米沙坦是否通过其多效性作用调节eNOS功能。给小鼠施用替米沙坦显著增加了主动脉内皮中eNOS(Ser 1177)的磷酸化水平,但施用缬沙坦没有影响。同样,替米沙坦处理人脐静脉内皮细胞显著增加了AMP活化蛋白激酶(Thr 172)和eNOS的磷酸化水平以及细胞内3′,5 ′-环磷酸鸟苷(cGMP)的浓度。此外,预处理与p38丝裂原活化蛋白激酶(p38 MAPK)抑制剂抑制eNOS的磷酸化水平和细胞内cGMP浓度的增加。这些数据表明,替米沙坦主要通过p38 MAPK信号传导,通过血管内皮细胞中Ser 1177磷酸化增加eNOS活性。
Because endothelial nitric oxide synthase (eNOS) has anti-inflammatory and anti-arteriosclerotic functions, it has been recognized as one of the key molecules essential for the homeostatic control of blood vessels other than relaxation of vascular tone. Here, we examined whether telmisartan modulates eNOS function through its pleiotropic effect. Administration of telmisartan to mice significantly increased the phosphorylation level of eNOS (Ser1177) in the aortic endothelium, but administration of valsartan had no effect. Similarly, telmisartan treatment of human umbilical vein endothelial cells significantly increased the phosphorylation levels of AMP-activated protein kinase (Thr172) and eNOS and the concentration of intracellular guanosine 3′,5′-cyclic monophosphate (cGMP). Furthermore, pretreatment with a p38 mitogen-activated protein kinase (p38 MAPK) inhibitor suppressed the increased phosphorylation level of eNOS and intracellular cGMP concentration. These data show that telmisartan increases eNOS activity through Ser1177 phosphorylation in vascular endothelial cells mainly via p38 MAPK signaling.
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