Enhancing adult nerve regeneration through the knockdown of retinoblastoma protein.

Enhancing adult nerve regeneration through the knockdown of retinoblastoma protein.
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DOI:
10.1038/ncomms4670
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发表时间:
2014-04-22
影响因子:
16.6
通讯作者:
Zochodne, Douglas
Zochodne, Douglas
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Christie, Kimberly J.;Krishnan, Anand;Martinez, Jose A.;Purdy, Kaylynn;Singh, Bhagat;Eaton, Shane;Zochodne, Douglas

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肿瘤抑制通路可能提供能够改变有丝分裂后成年神经元可塑性的新靶点。在这里,我们描述了视网膜母细胞瘤(Rb)蛋白,广泛表达于成人感觉神经元及其轴突,在再生过程中的作用。在成年感觉神经元中,体外Rb siRNA敲除或Rb 1缺失增强了神经突生长和分支。可塑性部分通过上调神经元的PPARγ实现;其拮抗作用抑制Rb siRNA可塑性,而PPARγ激动剂增加生长。在体内再生的范例后,完全周围神经干横断,Rb siRNA的直接交付提示增加的轴突从近端树桩和夹带雪旺细胞伴随他们更大的距离。类似地,神经挤压后的Rb siRNA递送改善了小鼠中运动和感觉恢复的行为指数。总体研究结果表明,抑制肿瘤抑制分子在促进成人神经元再生中发挥作用。
Tumour suppressor pathways may offer novel targets capable of altering the plasticity of post-mitotic adult neurons. Here we describe a role for retinoblastoma (Rb) protein, widely expressed in adult sensory neurons and their axons, during regeneration. In adult sensory neurons, Rb siRNA knockdown or Rb1 deletion in vitro enhances neurite outgrowth and branching. Plasticity is achieved in part through upregulation of neuronal PPARγ; its antagonism inhibits Rb siRNA plasticity whereas a PPARγ agonist increases growth. In an in vivo regenerative paradigm following complete peripheral nerve trunk transection, direct delivery of Rb siRNA prompts increased outgrowth of axons from proximal stumps and entrains Schwann cells to accompany them for greater distances. Similarly Rb siRNA delivery following a nerve crush improves behavioural indices of motor and sensory recovery in mice. The overall findings indicate that inhibition of tumour suppressor molecules has a role to play in promoting adult neuron regeneration.
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