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首页> 外文期刊>Neuron >VEGF Signaling through Neuropilin 1 Guides Commissural Axon Crossing at the Optic Chiasm.
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VEGF Signaling through Neuropilin 1 Guides Commissural Axon Crossing at the Optic Chiasm.

机译:通过Neuropilin 1进行的VEGF信号引导视交叉处的连合轴突交叉。

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摘要

During development, the axons of retinal ganglion cell (RGC) neurons must decide whether to cross or avoid the midline at the optic chiasm to project to targets on both sides of the brain. By combining genetic analyses with in vitro assays, we show that neuropilin 1 (NRP1) promotes contralateral RGC projection in mammals. Unexpectedly, the NRP1 ligand involved is not an axon guidance cue of the class 3 semaphorin family, but VEGF164, the neuropilin-binding isoform of the classical vascular growth factor VEGF-A. VEGF164 is expressed at the chiasm midline and is required for normal contralateral growth in vivo. In outgrowth and growth cone turning assays, VEGF164 acts directly on NRP1-expressing contralateral RGCs to provide growth-promoting and chemoattractive signals. These findings have identified a permissive midline signal for axons at the chiasm midline and provide in vivo evidence that VEGF-A is an essential axon guidance cue.
机译:在发育过程中,视网膜神经节细胞(RGC)神经元的轴突必须决定是交叉还是避免视交叉的中线向大脑两侧投射。通过将基因分析与体外分析相结合,我们表明神经纤毛蛋白1(NRP1)促进哺乳动物对侧RGC投射。出乎意料的是,所涉及的NRP1配体不是3类信号量家族的轴突指导线索,而是VEGF164,经典血管生长因子VEGF-A的神经纤维蛋白结合同工型。 VEGF164表达在chiasm中线,是体内正常对侧生长所必需的。在生长和生长锥转向测定中,VEGF164直接作用于表达NRP1的对侧RGC,以提供促进生长和趋化的信号。这些发现已经确定了在中枢神经中线处轴突的容许中线信号,并提供了体内证据表明VEGF-A是必不可少的轴突指导线索。

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