Peripheral nerve regeneration with 3D printed bionic double-network conductive scaffold based on...

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Regenerative Medicine

Background:

• Peripheral nerve injury (PNI) presents significant clinical challenges with limited effective treatments.
• Conductive hydrogels offer potential for neural repair by mimicking electroactive tissue environments.
• Three-dimensional (3D) printing enables precise fabrication of complex neural scaffolds.

Purpose of the Study:

• To develop a novel dual-bioink 3D printing strategy for creating biomimetic neural tissue structures.
• To integrate synthetic and natural materials for enhanced scaffold properties.
• To evaluate the efficacy of the 3D-printed scaffold in promoting neural differentiation and regeneration.

Main Methods:

• A dual-bioink approach combining a base ink (gelatin methacrylate, chitosan, polypyrrole) and a cell-loaded secondary ink (gelatin).
• Utilized a hybrid 3D printing technique for precise cell deposition within the conductive scaffold.
• Assessed scaffold mechanical properties, cytotoxicity, and neural cell (PC-12, HT-22) differentiation and axon regeneration.

Main Results:

• The 3D-printed composite scaffold demonstrated suitable mechanical properties and biocompatibility.
• The scaffold effectively supported neural differentiation and promoted axon regeneration in PC-12 and HT-22 cells.
• The conductive pathways within the scaffold facilitated electrical signal exchange, crucial for neural function.

Conclusions:

• The novel dual-bioink 3D-printed neural network scaffold shows significant potential for peripheral nerve injury treatment.
• This strategy facilitates neural functional recovery by promoting cell growth and regeneration.
• The biomimetic and conductive nature of the scaffold makes it a promising candidate for PNI therapies.