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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Netrin-1 induces angiogenesis via a DCC-dependent ERK1/2-eNOS feed-forward mechanism
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Netrin-1 induces angiogenesis via a DCC-dependent ERK1/2-eNOS feed-forward mechanism

机译:Netrin-1通过依赖DCC的ERK1 / 2-eNOS前馈机制诱导血管生成

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摘要

Netrin-1 is critical for axonal pathfinding which shares similarities with formation of vascular network. Here we report that netrin-1 induction of angiogenesis is mediated by an increase in endothelial nitric oxide (NO center dot) production, which occurs via a DCC-dependent, ERK1/2-eNOS feed-forward mechanism. Exposure of mature aortic endothelial cells to netrin-1 resulted in a potent, dose-dependent increase in NO center dot production, detected by electron spin resonance. Scavenging NO center dot with 2-phenyl-4,4,5,5-tetramethylimidazoline-loxyl-3-oxide (PTIO) abolished netrin-1 stimulated angiogenesis. Netrin-1-stimulated NO center dot production or angiogenesis was inhibited by DCC antibody, DCC small interfering RNA (siRNA), specific inhibitors (PD98059, U0126), or siRNAs for MEK1/2. PTIO attenuated ERKII/2 phosphorylation, indicating a feed-forward mechanism. Netrin-1 induced a time-dependent phosphorylation of eNOS(s1179), 0,6 and a rapid dephosphorylation of eNOS(t497). Only eNOS(s1179) was sensitive to U0126 or PTIO. These data characterized a mechanism whereby netrin-1 promotes angiogenesis, which may broadly relate to cardiovascular, neuronal and cancer physiology.
机译:Netrin-1对于轴突寻路至关重要,它与血管网的形成具有相似性。在这里我们报告netrin-1诱导血管生成是由内皮一氧化氮(NO中心点)产生的增加介导的,这是通过DCC依赖的ERK1 / 2-eNOS前馈机制发生的。通过电子自旋共振检测到,成熟的主动脉内皮细胞暴露于netrin-1导致NO中心点产生强效,剂量依赖性。用2-苯基-4,4,5,5-四甲基咪唑啉-氧代-3-氧(PTIO)清除NO中心点消除了netrin-1刺激的血管生成。 Netrin-1刺激的NO中心点产生或血管生成受到DCC抗体,DCC小干扰RNA(siRNA),特异性抑制剂(PD98059,U0126)或MEK1 / 2的siRNA抑制。 PTIO减弱ERKII / 2磷酸化,表明前馈机制。 Netrin-1诱导了eNOS(s1179),0.6的时间依赖性磷酸化和eNOS(t497)的快速去磷酸化。仅eNOS(s1179)对U0126或PTIO敏感。这些数据表征了netrin-1促进血管生成的机制,该机制可能广泛涉及心血管,神经元和癌症生理。

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