A novel scaffold with longitudinally oriented microchannels promotes peripheral nerve regeneration

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Neuroscience

Background:

• Peripheral nerve injuries often require nerve grafts to bridge gaps.
• Existing scaffolds aim to mimic natural nerve microstructures for guided regeneration.
• The in vivo efficacy of scaffolds with basal lamina-mimicking microchannels remains largely unevaluated.

Purpose of the Study:

• To develop and evaluate a novel collagen-chitosan (CCH) nerve scaffold.
• To assess the CCH scaffold's ability to bridge a significant peripheral nerve gap in vivo.
• To compare the regenerative capacity of the CCH scaffold against traditional nerve autografts.

Main Methods:

• Fabrication of a CCH scaffold with longitudinally oriented microchannels and interconnected pores.
• Implantation of the CCH scaffold to bridge a 15-mm sciatic nerve defect in a rat model.
• Assessment of nerve regeneration and functional recovery using morphological and functional analyses.

Main Results:

• The CCH scaffold successfully promoted nerve regeneration across the 15-mm gap.
• Functional recovery in rats treated with the CCH scaffold was comparable to those receiving nerve autografts.
• No exogenous regenerative agents or cell transplantation were required for the observed regeneration.

Conclusions:

• The developed CCH scaffold effectively guides peripheral nerve regeneration and functional recovery.
• CCH scaffolds represent a promising, potentially off-the-shelf, alternative to nerve autografts for treating peripheral nerve injuries.
• The biomimetic microchannel structure of the CCH scaffold is key to its regenerative potential.