Norrin/Frizzled4 signaling in retinal vascular development and blood brain barrier plasticity.

Norrin/Frizzled4 signaling in retinal vascular development and blood brain barrier plasticity.
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DOI:
10.1016/j.cell.2012.10.042
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发表时间:
2012-12-07
期刊:
影响因子:
64.5
通讯作者:
Nathans J
Nathans J
中科院分区:
生物学1区
文献类型:
--
作者:
Wang Y;Rattner A;Zhou Y;Williams J;Smallwood PM;Nathans J

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Norrin/Frizzled 4(Fz 4)信号传导激活经典Wnt通路以控制视网膜血管发育。使用基因工程小鼠,我们表明,早熟Norrin生产导致过早的视网膜血管侵袭和延迟Norrin生产导致视网膜内血管结构的特征性缺陷。在遗传镶嵌中,野生型内皮细胞(EC)指导邻近的Fz 4 −/− EC产生结构正常的镶嵌脉管系统,这是一种细胞非自主效应。然而,在随后的几周内,Fz 4 −/− EC被选择性地从镶嵌血管系统中消除,这意味着存在针对缺陷EC的质量控制程序。在成人视网膜和小脑中,Norrin/Fz 4信号传导的获得或丧失分别导致血视网膜屏障(BRB)和血脑屏障(BBB)功能的细胞自主获得或丧失,表明在成熟CNS血管结构中屏障维持和实质可塑性中持续需要Frizzled信号传导。
Norrin/Frizzled4 (Fz4) signaling activates the canonical Wnt pathway to control retinal vascular development. Using genetically engineered mice, we show that precocious Norrin production leads to premature retinal vascular invasion and delayed Norrin production leads to characteristic defects in intra-retinal vascular architecture. In genetic mosaics, wild type endothelial cells (ECs) instruct neighboring Fz4−/− ECs to produce an architecturally normal mosaic vasculature, a cell non-autonomous effect. However, over the ensuing weeks, Fz4−/− ECs are selectively eliminated from the mosaic vasculature, implying the existence of a quality control program that targets defective ECs. In the adult retina and cerebellum, gain or loss of Norrin/Fz4 signaling results in a cell-autonomous gain or loss, respectively, of blood retina barrier (BRB) and blood brain barrier (BBB) function, indicating an ongoing requirement for Frizzled signaling in barrier maintenance and substantial plasticity in mature CNS vascular structure.
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