The synaptic receptor Lrp4 promotes peripheral nerve regeneration.

The synaptic receptor Lrp4 promotes peripheral nerve regeneration.
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DOI:
10.1038/s41467-018-04806-4
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发表时间:
2018-06-19
影响因子:
16.6
通讯作者:
Granato M
Granato M
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Gribble KD;Walker LJ;Saint-Amant L;Kuwada JY;Granato M

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在PNS再生的早期,再生轴突从近端神经残端出现,但它们是否同时延伸或先驱轴突是否为追随者轴突建立路径仍然未知。此外,强大的再生的分子机制尚未完全理解。使用现场成像,我们证明,在斑马鱼开拓轴突建立一个再生路径的追随者轴突。我们发现这一过程需要突触受体lrp4,在lrp4突变体中,先驱者不受影响,而追随者轴突经常在损伤间隙处停滞,这为先驱者和追随者轴突在再生中的分子多样性提供了证据。我们证明Lrp4通过轴突外在机制促进再生,并且独立于突触发育所必需的膜锚定和MuSK共受体信号传导。最后,我们表明,Lrp4协调重新排列的失神经施万细胞与再生轴突,Lrp4是通过轴突-神经胶质细胞的相互作用,以促进持续的周围神经再生的模型相一致。损伤后,周围神经系统的轴突沿着施万细胞再生。在这里,作者表明再生轴突跟随先驱轴突,这一过程是由脂蛋白受体相关蛋白4(Lrp4)介导的,Lrp4是一种在突触形成中起作用的蛋白质。
Early during PNS regeneration, regenerating axons emerge from the proximal nerve stump, yet whether they extend simultaneously or whether pioneering axons establish a path for follower axons remains unknown. Moreover, the molecular mechanisms underlying robust regeneration are incompletely understood. Using live imaging, we demonstrate that in zebrafish pioneering axons establish a regenerative path for follower axons. We find this process requires the synaptic receptor lrp4, and in lrp4 mutants pioneers are unaffected while follower axons frequently stall at the injury gap, providing evidence for molecular diversity between pioneering and follower axons in regeneration. We demonstrate that Lrp4 promotes regeneration through an axon extrinsic mechanism and independent of membrane anchoring and MuSK co-receptor signaling essential for synaptic development. Finally, we show that Lrp4 coordinates the realignment of denervated Schwann cells with regenerating axons, consistent with a model by which Lrp4 is repurposed to promote sustained peripheral nerve regeneration via axon-glia interactions. Axons of the peripheral nervous system regenerate along Schwann cells following injury. Here, the authors show that regenerating axons follow pioneer axons and this process is mediated by lipoprotein receptor-related protein 4 (Lrp4), a protein otherwise known for its role in synapse formation.
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