Promoting axon regeneration in the adult CNS by modulation of the PTEN/mTOR pathway.

Promoting axon regeneration in the adult CNS by modulation of the PTEN/mTOR pathway.
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DOI:
10.1126/science.1161566
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发表时间:
2008-11-07
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
He Z
He Z
中科院分区:
其他
文献类型:
--
作者:
Park KK;Liu K;Hu Y;Smith PD;Wang C;Cai B;Xu B;Connolly L;Kramvis I;Sahin M;He Z

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轴突再生障碍是中枢神经系统损伤后功能恢复的主要障碍。去除细胞外抑制分子导致体内有限的轴突再生。为了测试轴突再生的内在障碍的作用,我们分析了细胞生长控制基因使用病毒辅助的体内条件性敲除方法。在成年视网膜神经节细胞(RGC)中缺失PTEN(磷酸酶和张力蛋白同源物)(哺乳动物雷帕霉素靶(mTOR)通路的负调节剂)促进视神经损伤后的稳健轴突再生。在野生型成年小鼠中,mTOR活性被抑制,并且在轴突切断的RGC中新蛋白质合成受损,这可能有助于再生失败。通过条件性敲除结节性硬化症复合物1(mTOR途径的另一负调节物)来重新激活该途径也导致轴突再生。因此,我们的研究结果表明,操纵内源性生长控制途径作为一种治疗方法,以促进轴突再生后中枢神经系统损伤。
The failure of axons to regenerate is a major obstacle for functional recovery after central nervous system (CNS) injury. Removing extracellular inhibitory molecules results in limited axon regeneration in vivo. To test for the role of intrinsic impediments to axon regrowth, we analyzed cell growth control genes using a virus-assisted in vivo conditional knockout approach. Deletion of PTEN (phosphatase and tensin homolog), a negative regulator of the mammalian target of rapamycin (mTOR) pathway, in adult retinal ganglion cells (RGCs) promotes robust axon regeneration after optic nerve injury. In wild-type adult mice, the mTOR activity was suppressed and new protein synthesis was impaired in axotomized RGCs, which may contribute to the regeneration failure. Reactivating this pathway by conditional knockout of tuberous sclerosis complex 1, another negative regulator of the mTOR pathway, also leads to axon regeneration. Thus, our results suggest the manipulation of intrinsic growth control pathways as a therapeutic approach to promote axon regeneration after CNS injury.
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