转录因子Engrailed-2引导视网膜轴突
Isabelle Brunet1, Christine Weinl, Michael Piper
1CNRS UMR 8542, Ecole Normale Supérieure, 46 rue d'Ulm, 75230 Paris Cedex 05, France.
Nature
|November 4, 2005
概括
Engrailed-2 (En-2) 蛋白质通过排斥状轴突和吸引鼻状轴突来引导发展视网膜轴突. 这种指导机制涉及En-2内部化和局部蛋白质合成,这对于视觉系统中地形图形形成至关重要.
科学领域:
- 神经科学是一个神经科学.
- 发育生物学 发展生物学
- 分子生物学分子生物学
背景情况:
- 嵌-2 (En-2) 是一种转录因子,对中脑发育和光学纹路模式至关重要.
- 已知的En-2的功能涉及DNA结合,但它也拥有域,表明在细胞通信中的作用.
- 光学纹体是视网膜的地形输入的一个关键目标.
研究的目的:
- 研究Engrailed-2 (En-2) 蛋白在指导视网膜轴突生长中的潜在作用.
- 为了确定En-2蛋白是否可以直接影响发育中的视觉系统中的轴突路径.
主要方法:
- 使用Xenopus作为一个模型生物体.
- 将En-2蛋白的外部梯度应用于视网膜轴突生长.
- 使用光标记的En-2来追踪其内部化到生长.
- 在存在En-2和蛋白质合成抑制剂时评估轴突回转反应.
主要成果:
- 外部En-2蛋白梯度差异地引导Xenopus视网膜轴突生长:排斥状轴突和吸引鼻状轴突.
- 用光标记的En-2在生长体内迅速积聚.
- 一种突变的En-2形式无法进入细胞并不会诱导轴突转向.
- En-2 内化触发了蛋白质酸化和局部蛋白质合成,这对于轴突转动至关重要.
- 蛋白质合成抑制剂阻断En-2-介导的轴突转向反应.
结论:
- 嵌-2 (En-2) 蛋白质作为视网膜轴突的指导线索,影响地形图的形成.
- En-2的指导功能取决于其内部化和在生长体内刺激局部蛋白质合成的能力.
- 这些发现揭示了En-2在脊椎动物视觉系统发育和神经电路组装中的新机制.
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