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首页> 外文期刊>Biochemical and Biophysical Research Communications >Endostar, a novel recombinant human endostatin, exerts antiangiogenic effect via blocking VEGF-induced tyrosine phosphorylation of KDR/Flk-1 of endothelial cells
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Endostar, a novel recombinant human endostatin, exerts antiangiogenic effect via blocking VEGF-induced tyrosine phosphorylation of KDR/Flk-1 of endothelial cells

机译:Endostar是一种新型的重组人内皮抑素,它通过阻断VEGF诱导的内皮细胞KDR / Flk-1酪氨酸磷酸化发挥抗血管生成作用

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Endostar, a novel recombinant human endostatin expressed and purified in Escherichia coli with an additional nine-amino acid sequence and forming another his-tag structure, was approved by the SFDA in 2005 for the treatment of non-small-cell lung cancer. But its mechanism of action has not been illustrated before. In this study, we examined the antiangiogenic activities of endostar in vitro and in vivo. The results showed that endostar suppressed the VEGF-stimulated proliferation, migration, and tube formation of human umbilical vein endothelial cells (HUVECs) in vitro. Endostar blocked microvessel sprouting from rat aortic rings in vitro. Moreover, it could inhibit the formation of new capillaries from pre-existing vessels in the chicken chorioallantoic membrane (CAM) assay and affect the growth of vessels in tumor. We further found the antiangiogenic effects of endostar were correlated with the VEGF-triggered signaling. Endostar suppressed the VEGF-induced tyrosine phosphorylation of KDR/Flk-1(VEGFR-2) as well as the overall VEGFR-2 expression and the activation of ERK, p38, MAPK, and AKT in HUVECs. Collectively, these data indicated the relationship between endostar and VEGF signal pathways and provided a molecular basis for the antiangiogenic effects of endostar. (c) 2007 Elsevier Inc. All rights reserved.
机译:Endostar是一种在大肠杆菌中表达和纯化的新型重组人内皮抑素,具有额外的9个氨基酸序列,并形成了另一个his-tag结构,该药物于2005年被SFDA批准用于治疗非小细胞肺癌。但是它的作用机理尚未阐明。在这项研究中,我们检查了endostar在体外和体内的抗血管生成活性。结果表明,endostar在体外抑制了VEGF刺激的人脐静脉内皮细胞(HUVECs)的增殖,迁移和管形成。 Endostar阻断了大鼠主动脉环的微血管萌发。此外,它可以抑制鸡绒膜尿囊膜(CAM)分析中先前存在的血管形成新的毛细血管,并影响肿瘤中血管的生长。我们进一步发现endostar的抗血管生成作用与VEGF触发的信号有关。 Endostar抑制了HUVEC中VEGF诱导的KDR / Flk-1(VEGFR-2)酪氨酸磷酸化以及整个VEGFR-2表达以及ERK,p38,MAPK和AKT的激活。总的来说,这些数据表明endstar和VEGF信号通路之间的关系,并为endstar的抗血管生成作用提供了分子基础。 (c)2007 Elsevier Inc.保留所有权利。

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