通过抑制C. elegans中的突触形成,Wnt信号定位神经肌肉连接
1Department of Biological Sciences and Neurosciences Program, Stanford University, Stanford, CA 94305, USA.
Cell
|August 28, 2007
概括
在C. elegans神经元中,Wnt信号限制了突触形成. 破坏这种通路会导致突触在错误的地方形成,揭示了Wnt信号如何模式神经连接.
科学领域:
- 神经科学是一个神经科学.
- 发展生物学 发展生物学
- 分子生物学分子生物学
背景情况:
- 突触连接对于神经系统的功能至关重要.
- 虽然已知协同生成的积极调节者,但消极调节者的理解较少.
- 轴突模式精确地控制突触形成的地方.
研究的目的:
- 调查负调节剂在突触生成的空间控制中的作用.
- 检查Wnt信号通路在限制Caenorhabditis elegans运动神经元DA9中的突触形成中的功能.
主要方法:
- 在C. elegans DA9运动神经元中突触形成的遗传分析.
- 调查了Wnt信号通路的组件:lin-44,egl-20,lin-17/Frizzled,以及dsh-1/Dishevelled. 这两种组件都被研究了.
- 利用途径组件的过度表达和遗传妥协来观察对前突触局部化的影响.
主要成果:
- Wnt通路组件lin-44及其受体lin-17/Frizzled局部化到通常缺乏突触前专业化的轴突子子域.
- 损害Wnt通路 (lin-44,egl-20,lin-17/Frizzled,dsh-1/Dishevelled) 在这个子域中导致异位突触的形成.
- 过度表达LIN-44扩大了LIN-17的局部化,抑制了前突触组合,并证明了突触发生的空间调节.
结论:
- 通过lin-44和lin-17/Frizzled的Wnt信号,在DA9运动神经元轴突中空间限制了前突触组合.
- 这条通路将轴突分为不同的域,一个允许的和一个不允许的,用于突触形成.
- 形态遗传信号可以通过创建空间分离的轴突域来模拟突触连接.
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