Co-targeting B-RAF and PTEN Enables Sensory Axons to Regenerate Across and Beyond the Spinal Cord Injury.

Co-targeting B-RAF and PTEN Enables Sensory Axons to Regenerate Across and Beyond the Spinal Cord Injury.
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DOI:
10.3389/fnmol.2022.891463
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发表时间:
2022
影响因子:
4.8
通讯作者:
Son, Young-Jin
Son, Young-Jin
中科院分区:
医学2区
文献类型:
--
作者:
Noristani, Harun N.;Kim, Hyukmin;Pang, Shuhuan;Zhong, Jian;Son, Young-Jin

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成年哺乳动物的初级感觉轴突在脊髓损伤(SCI)后无法再生,部分原因是内在生长潜力不足。大力提升其增长潜力仍然是一项挑战。此前,我们发现 B-RAF(快速加速纤维肉瘤激酶)的组成性激活可显着促进背根和视神经损伤后的轴突再生。 PTEN(磷酸酶和张力蛋白同源物)的补充缺失进一步增强了再生。在这里,我们检查了同时发生的 B-RAF 激活和 PTEN 缺失是否促进 SCI 后背柱轴突再生。值得注意的是,在成年小鼠的 DRG 神经元中选择性地基因靶向 B-RAF 和 PTEN,使得许多 DC 轴突能够在 SCI 后进入、穿过并生长到病变部位之外;损伤后 3 周,一些轴突到达病变部位约 2 毫米。与预处理损伤相比,共同靶向 B-RAF 和 PTEN 可促进更强大的 DC 再生,从而进一步增强 B-RAF/PTEN 触发的再生。我们还发现,损伤后靶向 B-RAF 和 PTEN 可增强 DC 轴突再生。这些结果表明,共同靶向 B-RAF 和 PTEN 有效增强了 SCI 后 DC 轴突的内在生长潜力,因此可能有助于开发一种新的策略来促进初级感觉轴突的强健长距离再生。
Primary sensory axons in adult mammals fail to regenerate after spinal cord injury (SCI), in part due to insufficient intrinsic growth potential. Robustly boosting their growth potential continues to be a challenge. Previously, we showed that constitutive activation of B-RAF (rapidly accelerated fibrosarcoma kinase) markedly promotes axon regeneration after dorsal root and optic nerve injuries. The regrowth is further augmented by supplemental deletion of PTEN (phosphatase and tensin homolog). Here, we examined whether concurrent B-RAF activation and PTEN deletion promotes dorsal column axon regeneration after SCI. Remarkably, genetically targeting B-RAF and PTEN selectively in DRG neurons of adult mice enables many DC axons to enter, cross, and grow beyond the lesion site after SCI; some axons reach ∼2 mm rostral to the lesion by 3 weeks post-injury. Co-targeting B-RAF and PTEN promotes more robust DC regeneration than a pre-conditioning lesion, which additively enhances the regeneration triggered by B-RAF/PTEN. We also found that post-injury targeting of B-RAF and PTEN enhances DC axon regeneration. These results demonstrate that co-targeting B-RAF and PTEN effectively enhances the intrinsic growth potential of DC axons after SCI and therefore may help to develop a novel strategy to promote robust long-distance regeneration of primary sensory axons.
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