Abstract
After peripheral nerve injury, both Schwann cells and PNS neurons reprogram to new phenotypes that promote repair. Myelin and Remak cells generate repair Schwann cells that support neuronal survival and promote axonal regeneration. Trophic factors, cytokines, and epithelial-mesenchymal transition (EMT) genes are upregulated, myelin genes are downregulated, autophagy is activated, and the cells proliferate, elongate, and branch to form regeneration tracks. This reprogramming has features in common with injury responses in other tissues. The repair Schwann cell phenotype fades with time after injury, and in aged animals the activation of the repair phenotype is subdued. This is a key contributor to poor axonal regeneration through the distal nerve stump after long-term denervation and in aged animals. The connective and epithelial tissues of peripheral nerves are important factors in nerve homeostasis and injury, and the formation of these protective tissues is dependent on developing Schwann cells. It has become clear that among the mechanisms that control repair cells are dedicated signals, including c-Jun, Merlin, STAT3, and epigenetic mechanisms that have relatively little or no function in development. In the future, it will be important to learn more about the distinctive signalling pathways that control the performance and long-term maintenance of repair Schwann cells, since this will facilitate the search for ways to manipulate these mechanisms for promoting regeneration.
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Acknowledgments
The work from the authors’ laboratory discussed in this chapter was supported by the Wellcome Trust (Programme Grant 074665 to K.R.J. and R.M.), the Medical Research Council (Project Grant G0600967 to K.R.J. and R.M.), and the European Community (Grant HEALTH-F2-2008-201535 from FP7/2007-3013). The authors thank members of their laboratory for their contributions to the work described in this chapter.
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Jessen, K.R., Mirsky, R. (2020). Schwann Cells in Nerve Repair and Regeneration. In: Phillips, J., Hercher, D., Hausner, T. (eds) Peripheral Nerve Tissue Engineering and Regeneration. Reference Series in Biomedical Engineering(). Springer, Cham. https://doi.org/10.1007/978-3-030-06217-0_6-1
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