Tissue-engineered spiral nerve guidance conduit for peripheral nerve regeneration

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Neuroscience

Background:

• Peripheral nerve injuries often result in significant functional deficits.
• Nerve guidance conduits (NGCs) are used to bridge nerve gaps, but enhancing their efficacy remains a challenge.
• Existing NGC designs with channels and topography show promise but can be further optimized.

Purpose of the Study:

• To develop and investigate a novel spiral nerve guidance conduit (NGC) with aligned nanofibers and an outer nanofibrous tube.
• To evaluate the efficacy of this novel spiral NGC in promoting peripheral nerve regeneration across a 10-mm sciatic nerve gap in rats.

Main Methods:

• Fabrication of a novel spiral NGC with inner aligned nanofibers and an outer randomly nanofibrous tube.
• Utilized a rat sciatic nerve defect model (10-mm gap).
• Assessed nerve regeneration using walking track analysis, electrophysiology, nerve histology, and gastrocnemius muscle measurements.

Main Results:

• The novel spiral NGC, with and without inner nanofibers, increased the success rate of nerve regeneration after 6 weeks.
• Combining the spiral NGC with inner aligned nanofibers and an outer nanofibrous tube demonstrated substantial improvements in nerve regeneration.
• Histological analysis revealed 50% more myelinated axons in the spiral NGC compared to a standard tubular NGC.

Conclusions:

• The novel spiral NGC with inner aligned nanofibers and an outer nanofibrous tube provides a superior environment for peripheral nerve regeneration compared to standard tubular NGCs.
• This advanced NGC design enhances surface area and provides topographical cues for guided neurite extension.
• The findings offer valuable insights for optimizing tissue-engineering strategies for peripheral nerve repair.