EphrinB2 controls vessel pruning through STAT1-JNK3 signalling.

EphrinB2 controls vessel pruning through STAT1-JNK3 signalling.
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DOI:
10.1038/ncomms7576
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发表时间:
2015-03-26
影响因子:
16.6
通讯作者:
Tosato, Giovanna
Tosato, Giovanna
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Salvucci, Ombretta;Ohnuki, Hidetaka;Maric, Dragan;Hou, Xu;Li, Xuri;Yoon, Sung Ok;Segarra, Marta;Eberhart, Charles G.;Acker-Palmer, Amparo;Tosato, Giovanna

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血管生成产生原始血管网络,需要修剪以产生分层组织和功能性血管。尽管血管修剪对血管模式和功能至关重要,但调节这一过程的机制尚不清楚。在这里,我们表明,EphrinB 2,一个众所周知的球员在血管生成,是一个重要的调节内皮细胞死亡和血管修剪。这种调节依赖于磷酸酪氨酸-EphrinB 2信号转导通过STAT 1抑制JNK 3活性。JNK 3激活导致内皮细胞死亡。在JNK 3不存在的情况下,玻璃体血管生理修剪受损,与玻璃体血管的异常持久性、有缺陷的视网膜脉管系统和小眼球相关。这种综合征非常类似于人类持续性增生性原发性玻璃体(PHPV),归因于玻璃体血管复旧失败。我们的研究结果提供了证据,EphrinB 2/STAT 1/JNK 3信号是必不可少的血管修剪,这一途径的缺陷可能有助于PHPV。
Angiogenesis produces primitive vascular networks that need pruning to yield hierarchically organized and functional vessels. Despite the critical importance of vessel pruning to vessel patterning and function, the mechanisms regulating this process are not clear. Here we show that EphrinB2, a well-known player in angiogenesis, is an essential regulator of endothelial cell death and vessel pruning. This regulation depends upon phosphotyrosine-EphrinB2 signaling repressing JNK3 activity via STAT1. JNK3 activation causes endothelial cell death. In the absence of JNK3, hyaloid vessel physiological pruning is impaired, associated with abnormal persistence of hyaloid vessels, defective retinal vasculature and microphthalmia. This syndrome closely resembles human persistent hyperplastic primary vitreus (PHPV), attributed to failed involution of hyaloid vessels. Our results provide evidence that EphrinB2/STAT1/JNK3 signaling is essential for vessel pruning, and that defects in this pathway may contribute to PHPV.
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