Fabrication of Anatomically Equivalent Pectin-Based Multifilament Nerve Conduits

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Tissue Engineering

Background:

• Peripheral nerve defects pose challenges for regeneration due to issues with axonal guidance and fascicular complementation.
• Conventional hollow nerve guides often fail to provide adequate support for nerve repair.

Purpose of the Study:

• To fabricate and evaluate dual cross-linked, pectin-based multifilament nerve conduits for peripheral nerve regeneration.
• To address the limitations of current nerve guides in ensuring proper reinnervation and axonal guidance.

Main Methods:

• Pectin was conjugated with methacrylate residues and fabricated into multifilament conduits using a 3D wet writing process followed by photo-cross-linking.
• Conduit anatomy was analyzed using scanning electron microscopy and micro-CT.
• Cytocompatibility and neurite outgrowth were assessed using PC12 cells.
• Ex vivo testing in a goat sciatic nerve model evaluated fascicular complementation.

Main Results:

• The multifilament conduits exhibited anatomical equivalence to native nerve structures.
• Conduits demonstrated cytocompatibility and promoted significant neurite outgrowth (16.90 ± 1.82 μm at day 14).
• Precise fascicular complementation was achieved in an ex vivo goat sciatic nerve model, eliminating the need for sutures.

Conclusions:

• Dual cross-linked pectin-based multifilament nerve conduits are a promising, customizable solution for peripheral nerve repair.
• This approach facilitates axonal regeneration and precise fascicular complementation, improving outcomes for nerve defects.