Related Experiment Video
Updated: Apr 15, 2026
06:17
Investigating Mammalian Axon Regeneration: In Vivo Electroporation of Adult Mouse Dorsal Root Ganglion
Published on: September 1, 2018
9.1K
Transcriptomic and morphological characterization reveals distinct regeneration kinetics in immediate versus delayed
Marina García-Bejarano1,2,3, Federica Zen1,2, Marwa El Soury1,2
1Department of Clinical and Biological Sciences (DSCB), University of Torino, Torino, Italy.
Neural Regeneration Research
|April 14, 2026
Summary
Immediate nerve repair promotes faster regeneration than delayed repair, though both eventually converge. Delayed repair shows impaired nerve caliber, emphasizing early intervention for better outcomes in peripheral nerve injury.
Area of Science:
- Neuroscience
- Regenerative Medicine
- Molecular Biology
Background:
- Peripheral nerve injury presents significant regenerative challenges.
- Delayed repair is often clinically necessary when immediate intervention is not possible.
- Understanding molecular mechanisms is key to optimizing functional recovery after nerve injury.
Purpose of the Study:
- To conduct the first transcriptomic analysis of nerve regeneration within a conduit.
- To compare immediate versus delayed nerve repair in a rat model.
- To investigate key pathways involved in nerve regeneration after injury.
Main Methods:
- Microsurgical repair of an 8-mm median nerve gap using chitosan tubes in rats.
- Comparison of immediate repair versus delayed repair (3-month delay).
- Morphometric analysis and RNA sequencing of regenerated nerves at various time points.
Main Results:
- Delayed repair showed reduced absolute Schwann cell, axonal areas, and blood vessel counts initially.
- Normalized morphometric analysis revealed no significant differences at 21 days between groups.
- Transcriptomic analysis identified differential gene expression related to inflammation, phagocytosis, and cell signaling, with immediate repair showing a faster response.
- Delayed repair exhibited a slower, yet ultimately convergent regenerative trajectory, with reduced nerve caliber.
Conclusions:
- Immediate peripheral nerve repair initiates a more rapid regenerative response compared to delayed repair.
- Delayed repair, while slower, shows a convergent regenerative path, but with some impairment and reduced nerve caliber.
- Findings highlight the importance of early intervention and provide transcriptomic insights for developing novel therapies to enhance nerve regeneration.
