Notch signaling inhibits axon regeneration.

Notch signaling inhibits axon regeneration.
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DOI:
10.1016/j.neuron.2011.11.017
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发表时间:
2012-01-26
期刊:
影响因子:
16.2
通讯作者:
Hammarlund M
Hammarlund M
中科院分区:
医学1区
文献类型:
--
作者:
El Bejjani R;Hammarlund M

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许多神经元在损伤后再生轴突的能力有限。哺乳动物CNS中的神经元不能再生,甚至PNS中的神经元也常常不能再生到它们以前的靶点。这种失败可能部分是由于主动限制再生的途径;然而,只有少数限制再生的因素是已知的。在这里,使用体内再生的单神经元分析,我们表明Notch/lin-12信号抑制成熟C.线虫神经元Notch信号传导通过在受损细胞中自主作用以阻止生长锥形成来抑制再生。在发育过程中导致Notch激活的金属蛋白酶和γ-分泌酶切割事件也是其再生活性所需的。此外,在受伤后立即阻止Notch激活可以提高再生。我们的研究结果定义了一个新的,发育后的作用,Notch通路作为轴突再生的抑制剂在体内。
Many neurons have limited capacity to regenerate their axons after injury. Neurons in the mammalian CNS do not regenerate, and even neurons in the PNS often fail to regenerate to their former targets. This failure is likely due in part to pathways that actively restrict regeneration; however, only a few factors that limit regeneration are known. Here, using single-neuron analysis of regeneration in vivo, we show that Notch/lin-12 signaling inhibits the regeneration of mature C. elegans neurons. Notch signaling suppresses regeneration by acting autonomously in the injured cell to prevent growth cone formation. The metalloprotease and gamma-secretase cleavage events that lead to Notch activation during development are also required for its activity in regeneration. Furthermore, blocking Notch activation immediately after injury improves regeneration. Our results define a novel, post-developmental role for the Notch pathway as a repressor of axon regeneration in vivo.
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