E3 ligase Nedd4 promotes axon branching by downregulating PTEN.

E3 ligase Nedd4 promotes axon branching by downregulating PTEN.
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DOI:
10.1016/j.neuron.2010.01.017
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发表时间:
2010-02-11
期刊:
影响因子:
16.2
通讯作者:
Holt CE
Holt CE
中科院分区:
医学1区
文献类型:
--
作者:
Drinjakovic J;Jung H;Campbell DS;Strochlic L;Dwivedy A;Holt CE

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通过泛素-蛋白酶体系统(UPS)调节蛋白质降解在建立突触连接中起着核心作用,但对参与的特定UPS组分或神经元中的UPS靶点知之甚少。我们报告说,抑制UPS在开发非洲爪蟾视网膜神经节细胞(RGC)与显性负泛素突变减少终端分支顶盖,但不影响远程导航顶盖。我们确定Nedd 4作为RGC轴突生长锥中显著表达的E3连接酶,并表明破坏其功能会严重抑制末端分支。我们进一步证明,P13 K通路的负调节因子PTEN是Nedd 4的关键下游靶点:Nedd 4不仅调节RGC生长锥中的PTEN水平,而且PTEN的减少挽救了由Nedd 4抑制引起的分支缺陷。总之,我们的数据表明,Nedd 4调节的PTEN是体内末端树枝化的关键调节因子。视网膜轴突终末分支需要泛素-蛋白酶体系统,Nedd 4下调视网膜轴突生长锥中的PTEN,Nedd 4下调PTEN促进视网膜轴突终末分支
Regulated protein degradation via the ubiquitin-proteasome system (UPS) plays a central role in building synaptic connections, yet little is known about either which specific UPS components are involved or UPS targets in neurons. We report that inhibiting the UPS in developing Xenopus retinal ganglion cells (RGCs) with a dominant-negative ubiquitin mutant decreases terminal branching in the tectum but does not affect long-range navigation to the tectum. We identify Nedd4 as a prominently expressed E3 ligase in RGC axon growth cones and show that disrupting its function severely inhibits terminal branching. We further demonstrate that PTEN, a negative regulator of the PI3K pathway, is a key downstream target of Nedd4: not only does Nedd4 regulate PTEN levels in RGC growth cones, but also, the decrease of PTEN rescues the branching defect caused by Nedd4 inhibition. Together our data suggest that Nedd4-regulated PTEN is a key regulator of terminal arborization in vivo. ► The Ubiquitin-Proteasome System is required for terminal branching of retinal axons ► E3 ligase Nedd4 downregulates PTEN in retinal axon growth cones ► PTEN downregulation by Nedd4 promotes terminal branching of retinal axons
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