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首页> 外文期刊>Neuron >Netrin1 Produced by Neural Progenitors, Not Floor Plate Cells, Is Required for Axon Guidance in the Spinal Cord
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Netrin1 Produced by Neural Progenitors, Not Floor Plate Cells, Is Required for Axon Guidance in the Spinal Cord

机译:由神经祖细胞产生的Netrin1,不是脊髓内的轴突引导所必需的

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摘要

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. Further-more, 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.
机译:已经提出了Netrin1从地板(FP)起作用,作为胚胎脊髓中的连合轴突的远程扩散化学记录剂。 然而,Netrin1 mRNA和蛋白质也存在于心室区域(VZ)内的神经祖细胞中,提高Netrin1的来源促进腹侧轴颈生长。 在这里,我们使用小鼠中的遗传方法来选择性地从脊髓的不同区域中取出尿素。 我们的分析表明,FP不是Netrin1指向腹侧中线的源头,而这一步骤需要局部VZ供应的Netrin1。 另外,除了梯度中的较多,而不是存在于梯度中,该蛋白质累积在邻近连轴轴突延伸的路径附近的小护地表面上。 因此,Netrin1不充当用于悬垂脊柱轴突的远程分泌的化学术,而是通过触摸腹促进介绍轴突的轴突,I。 即,沿着粘合表面的定向生长。

著录项

  • 来源
    《Neuron》 |2017年第4期|共10页
  • 作者单位

    Univ Calif Los Angeles Dept Neurobiol Los Angeles CA 90095 USA;

    Univ Calif Los Angeles Dept Neurobiol Los Angeles CA 90095 USA;

    Univ Calif Los Angeles Dept Neurobiol Los Angeles CA 90095 USA;

    Inst Rech Clin Montreal 110 Ave Pins Ouest Montreal PQ H2W 1R7 Canada;

    Univ Nebraska Dept Biol Kearney NE 68849 USA;

    Taipei Med Univ Grad Inst Neural Regenerat Med Coll Med Sci &

    Technol Taipei Taiwan;

    Univ Texas Hlth Sci Ctr Houston Dept Anesthesiol McGovern Med Sch Houston TX 77030 USA;

    Inst Rech Clin Montreal 110 Ave Pins Ouest Montreal PQ H2W 1R7 Canada;

    Univ Calif Los Angeles Dept Neurobiol Los Angeles CA 90095 USA;

    Univ Calif Los Angeles Dept Neurobiol Los Angeles CA 90095 USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 神经病学;
  • 关键词

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