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首页> 外文期刊>Neuron >Differential functions of the C. elegans FGF receptor in axon outgrowth and maintenance of axon position.
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Differential functions of the C. elegans FGF receptor in axon outgrowth and maintenance of axon position.

机译:秀丽隐杆线虫FGF受体在轴突生长和轴突位置维持中的差异功能。

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摘要

Wiring of the nervous system requires that axons navigate to their targets and maintain their correct positions in axon fascicles after termination of axon outgrowth. We show here that the C. elegans fibroblast growth factor receptor (FGFR), EGL-15, affects both processes in fundamentally distinct manners. FGF-dependent activation of the EGL-15 tyrosine kinase and subsequently the GTPase LET-60/ras is required within epidermal cells, the substratum for most outgrowing axon, for appropriate outgrowth of specific axon classes to their target area. In contrast, genetic elimination of the FGFR isoform EGL-15(5A), defined by the inclusion of an alternative extracellular interimmunoglobulin domain, has no consequence for axon outgrowth but leads to a failure to postembryonically maintain axon position within defined axon fascicles. An engineered, secreted form of EGL-15(5A) containing only its ectodomain is sufficient for maintenance of axon position, thus providing novel insights into receptor tyrosine kinase function and the process of maintaining axon position.
机译:神经系统的接线需要在轴突生长终止后,轴突导航到其目标并在轴突束中保持正确的位置。我们在这里显示秀丽隐杆线虫成纤维细胞生长因子受体(FGFR),EGL-15,以根本不同的方式影响两个过程。 EGL-15酪氨酸激酶以及随后的GTPase LET-60 / ras的FGF依赖性激活是表皮细胞(大多数轴突生长的基质)内所需的,以使特定轴突类别适当地生长到其靶区域。相比之下,FGFR亚型EGL-15(5A)的遗传消除(包括一个替代的细胞外免疫球蛋白结构域定义)对轴突的生长没有影响,但导致无法在胚胎后维持轴突在特定轴突束中的位置。仅包含其胞外域的EGL-15(5A)的工程化,分泌形式足以维持轴突位置,从而提供对受体酪氨酸激酶功能和轴突位置保持过程的新颖见解。

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