Netrin1 Produced by Neural Progenitors, Not Floor Plate Cells, Is Required for Axon Guidance in the Spinal Cord.

Netrin1 Produced by Neural Progenitors, Not Floor Plate Cells, Is Required for Axon Guidance in the Spinal Cord.
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脊髓中的轴突引导需要由神经祖细胞而非地板细胞产生的Netrin1。

DOI:
10.1016/j.neuron.2017.03.007
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发表时间:
2017-05-17
期刊:
影响因子:
16.2
通讯作者:
Butler SJ
Butler SJ
中科院分区:
医学1区
文献类型:
--
作者:
Varadarajan SG;Kong JH;Phan KD;Kao TJ;Panaitof SC;Cardin J;Eltzschig H;Kania A;Novitch BG;Butler SJ

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Netrin1 已被提议从底板 (FP) 起作用,作为胚胎脊髓中连合轴突的远程扩散化学引诱剂。然而,netrin1 mRNA 和蛋白质也存在于心室区 (VZ) 内的神经祖细胞中,这就提出了 netrin1 的哪种来源促进腹侧定向轴突生长的问题。在这里,我们在小鼠身上使用遗传方法选择性地去除脊髓不同区域的 netrin。我们的分析表明,FP 不是将轴突引导至腹侧中线的 netrin1 的来源,而此步骤需要本地 VZ 提供的 netrin1。此外,netrin1 蛋白不是以梯度形式存在,而是积聚在与连合轴突延伸路径相邻的软脑膜表面上。因此,netrin1 并不充当连合脊髓轴突的远程分泌化学引诱剂,而是通过触触性促进腹侧定向轴突生长,即沿着粘附表面定向生长。
Netrin1 has been proposed to act from the floor plate (FP) as a long-range diffusible chemoattractant for commissural axons in the embryonic spinal cord. However, netrin1 mRNA and protein are also present in neural progenitors within the ventricular zone (VZ), raising the question of which source of netrin1 promotes ventrally-directed axon growth. Here, we use genetic approaches in mice to selectively remove netrin from different regions of the spinal cord. Our analyses show that the FP is not the source of netrin1 directing axons to the ventral midline while local VZ-supplied netrin1 is required for this step. Furthermore, rather than being present in a gradient, netrin1 protein accumulates on the pial surface adjacent to the path of commissural axon extension. Thus, netrin1 does not act as a long-range secreted chemoattractant for commissural spinal axons, but instead promotes ventrally-directed axon outgrowth by haptotaxis, i.e. directed growth along an adhesive surface.
Frazzled促进果蝇视觉系统中Netrin梯度来源的生长锥附着。
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