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Failures of nerve regeneration caused by aging or chronic denervation are rescued by restoring Schwann cell c-Jun

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Wagstaff, Laura J 
Gomez-Sanchez, Jose A  ORCID logo
Fazal, Shaline V 
Kilpatrick, Alastair M  ORCID logo


After nerve injury, myelin and Remak Schwann cells reprogram to repair cells specialized for regeneration. Normally providing strong regenerative support, these cells fail in aging animals, and during chronic denervation that results from slow axon growth. This impairs axonal regeneration and causes significant clinical problems. In mice, we find that repair cells express reduced c-Jun protein as regenerative support provided by these cells declines during aging and chronic denervation. In both cases, genetically restoring Schwann cell c-Jun levels restores regeneration to control levels. We identify potential gene candidates mediating this effect and implicate Shh in the control of Schwann cell c-Jun levels. This establishes that a common mechanism, reduced c-Jun in Schwann cells, regulates success and failure of nerve repair both during aging and chronic denervation. This provides a molecular framework for addressing important clinical problems, suggesting molecular pathways that can be targeted to promote repair in the PNS.



Research Article, Neuroscience, Stem Cells and Regenerative Medicine, nerve regeneration, schwann cell, c-Jun, aging, chronic denervation, repair cell, Mouse

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eLife Sciences Publications, Ltd
EC Seventh Framework Programm (HEALTH F2 2008-201535)
Wellcome Trust (Programme Grant 074665)
Wellcome Trust (PhD studentship 511851 FBAGG F96 WT Stern (No 161 761)
Medical Research Council (Project grant G0600967))
Agencia Estatal de Investigación (BFU2016-75864R)
Agencia Estatal de Investigación (PID2019-109762RB-I00)
Conselleria de Sanitat, Generalitat Valenciana (PROMETEO 2018/114)
National Institute of Child Health and Human Development (HD090256)
National Institute of Neurological Disorders and Stroke (NS075269)
National Institute of Neurological Disorders and Stroke (NS100510)
Wellcome Trust (206634)