Electrospun micro- and nanofiber tubes for functional nervous regeneration in sciatic nerve transections

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Neuroscience

Background:

• Peripheral nerve injury can cause significant motor-sensory pathway disruption.
• Existing nerve prostheses often use rigid guides, leading to cell loss.
• Electrospinning offers a method to create flexible, porous tubular scaffolds.

Purpose of the Study:

• To evaluate the efficacy of electrospun biodegradable polymer tubes for peripheral nerve regeneration.
• To assess functional recovery and histological outcomes in a rat sciatic nerve injury model.

Main Methods:

• Utilized electrospun tubes (PLGA/PCL blend) as guidance conduits for a 10-mm rat sciatic nerve gap.
• Compared outcomes in control (lesioned only) and treated (implanted conduits) groups.
• Analyzed nerve regeneration, myelination, collagen IV deposition, inflammation, neural connections, and muscle reinnervation over four months.

Main Results:

• Control nerves failed to reconnect.
• Electrospun tubes facilitated significant nerve regeneration and functional reconnection in treated animals.
• Histological analysis showed myelination and collagen IV deposition, with no significant inflammation.
• Neural tracers and evoked potentials confirmed re-established neuronal connections and muscle reinnervation.

Conclusions:

• Electrospun tubes serve as effective scaffolds for functional nerve regeneration without additional biological coatings or drugs.
• The technique's versatility allows for scaffold customization and potential application in other tissues.
• Future improvements include tuning mechanical properties, biomimetic functionalization, and incorporating various fillers or cells.