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首页> 外文期刊>Journal of Cellular Physiology >beta Common receptor integrates the erythropoietin signaling in activation of endothelial nitric oxide synthase.
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beta Common receptor integrates the erythropoietin signaling in activation of endothelial nitric oxide synthase.

机译:β共同整合了促红细胞生成素受体在激活内皮氮信号氧化合成酶。

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Erythropoietin (EPO), the key hormone for erythropoiesis, also increases nitric oxide (NO) bioavailability in endothelial cells (ECs), yet the definitive mechanisms are not fully understood. Increasing evidence has demonstrated that beta common receptor (betaCR) plays a crucial role in EPO-mediated non-hematopoietic effects. We investigated the role of betaCR in EPO-induced endothelial NO synthase (eNOS) activation in bovine aortic ECs (BAECs) and the molecular mechanisms involved. Results of confocal microscopy and immunoprecipitation analyses revealed that betaCR was colocalized and interacted with EPO receptor (EPOR) in ECs. Inhibition of betaCR or EPOR by neutralizing antibodies or small interfering RNA abolished the EPO-induced NO production. Additionally, blockage of betaCR abrogated the EPO-induced increase in the phosphorylation of eNOS, Akt, Src, or Janus kinase 2 (JAK2). Immunoprecipitation analysis revealed that treatment with EPO increased the interaction between betaCR and eNOS, which was suppressed by inhibition of Src, JAK2, or Akt signaling with specific pharmacological inhibitors. Furthermore, EPO-induced EC proliferation, migration, and tube formation were blocked by pretreatment with betaCR antibody and Src, JAK2, or PI3K/Akt inhibitors. Moreover, in vivo experiments showed that EPO increased the level of phosphorylated eNOS, Src, JAK2, and Akt, as well as betaCR-eNOS association in aortas and promoted the angiogenesis in Matrigel plug, which was diminished by betaCR or EPOR neutralizing antibodies. Our findings suggest that betaCR may play an integrative role in the EPO signaling-mediated activation of eNOS in ECs.
机译:促红细胞生成素(EPO)的关键激素红细胞生成,也会增加一氧化氮(NO)在内皮细胞(ECs),生物利用度的机制还没有完全理解。β共同受体(betaCR)扮演至关重要的作用在EPO-mediated non-hematopoietic效果。EPO-induced内皮没有合酶(以挪士)激活牛主动脉ECs (BAECs)和分子机制。共焦显微镜和免疫沉淀反应分析发现,betaCR与和ECs与促红细胞生成素受体(EPOR)。抑制betaCR或EPOR中和抗体或小干扰RNA废除了EPO-induced没有生产。betaCR废除EPO-induced增加一种蛋白激酶的磷酸化以挪士,Src,或者杰纳斯激酶2 (JAK2)。显示,促红细胞生成素治疗增加了betaCR之间的相互作用和以挪士抑制抑制的Src、JAK2或一种蛋白激酶信号与特定的药理抑制剂。增殖、迁移和管形成被预处理和betaCR抗体Src、JAK2或PI3K / Akt抑制剂。体内实验表明,促红细胞生成素的增加磷酸化水平以挪士,Src、JAK2和一种蛋白激酶,以及在主动脉和betaCR-eNOS协会促进了血管生成在基底膜基质插头,减少了betaCR还是EPOR中和抗体。在欧洲专利局发挥综合作用ECs signaling-mediated激活以挪士。

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