Biocompatible, Ion-Conductive Hydrogel-Filled Nerve Conduit for Peripheral Nerve Regeneration

Area of Science:

• Biomaterials Science
• Neuroscience
• Regenerative Medicine

Background:

• Peripheral nerve injuries often result in permanent functional loss due to insufficient natural axon regeneration.
• Current treatments like autografts have limitations, including donor-site morbidity.
• Existing conductive nerve guides often use non-biodegradable materials that can cause inflammation.

Purpose of the Study:

• To develop a biodegradable conductive hydrogel for bridging large nerve gaps.
• To support native axon regeneration and improve functional recovery.
• To overcome the limitations of conventional nerve regeneration strategies.

Main Methods:

• A biodegradable conductive hydrogel was engineered by conjugating a choline-based bioionic liquid (BioIL) to a gelatin methacrylol (GelMA) hydrogel.
• The GelMA/BioIL hydrogel's biocompatibility and ability to support nerve regeneration were assessed in vitro using Schwann cells and dorsal root ganglia.
• The hydrogel was implanted within a poly(l-lactide-co-caprolactone) nerve conduit in a rat model of peripheral nerve injury.

Main Results:

• The GelMA/BioIL hydrogel supported Schwann cell myelination and axon outgrowth in vitro.
• Rats treated with the GelMA/BioIL hydrogel-filled nerve conduit showed improved motor and sensory function recovery.
• Histological analysis revealed increased regenerated axons, enhanced myelination, and reduced muscle atrophy in the treated group.

Conclusions:

• The developed BioIL-functionalized hydrogel is a promising biodegradable material for peripheral nerve regeneration.
• This engineered hydrogel effectively bridges nerve gaps, promotes axon regeneration, and improves functional outcomes.
• The findings support the use of BioIL-hydrogels in biocompatible nerve conduits for treating peripheral nerve injuries.