Injury-induced HDAC5 nuclear export is essential for axon regeneration.

Injury-induced HDAC5 nuclear export is essential for axon regeneration.
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DOI:
10.1016/j.cell.2013.10.004
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发表时间:
2013-11-07
期刊:
影响因子:
64.5
通讯作者:
Cavalli V
Cavalli V
中科院分区:
生物学1区
文献类型:
--
作者:
Cho Y;Sloutsky R;Naegle KM;Cavalli V

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沉默转录程序的重新激活是损伤后轴突成功再生的关键步骤。然而,这种程序在受伤后是如何解锁的,在很大程度上还没有被探索。我们发现,外周感觉神经元轴突损伤引起反向传播的钙波侵入索马,并以PKCμ依赖的方式引起HDAC 5的核输出。损伤诱导的HDAC5核输出增强组蛋白乙酰化以激活促再生基因表达程序。HDAC5核输出是轴突再生所需的,因为核捕获的HDAC5突变体的表达阻止轴突再生,而增强HDAC5核输出在体外和体内促进轴突再生。在中枢神经系统损伤模型中,HDAC5通路的组分未能被激活。这些研究揭示了从轴突损伤位点到控制神经元生长能力的索马的信号传导机制,并表明HDAC 5作为控制轴突再生的转录开关的作用。
Reactivation of a silent transcriptional program is a critical step in successful axon regeneration following injury. Yet how such program is unlocked after injury remains largely unexplored. We found that axon injury in peripheral sensory neurons elicits a back-propagating calcium wave that invades the soma and causes nuclear export of HDAC5 in a PKCµ–dependent manner. Injury-induced HDAC5 nuclear export enhances histone acetylation to activate a pro-regenerative gene expression program. HDAC5 nuclear export is required for axon regeneration, since expression of a nuclear-trapped HDAC5 mutant prevents axon regeneration, whereas enhancing HDAC5 nuclear export promotes axon regeneration in vitro and in vivo. Components of this HDAC5 pathway failed to be activated in a model of central nervous system injury. These studies reveal a signaling mechanism from the axon injury site to the soma that controls neuronal growth competence and suggest a role for HDAC5 as a transcriptional switch controlling axon regeneration.
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