3D-engineering of Cellularized Conduits for Peripheral Nerve Regeneration

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Regenerative Medicine

Background:

• Peripheral nerve defects pose significant challenges in regeneration.
• Current methods for bridging nerve gaps often lack optimal guiding and biological cues.
• A flexible method for creating cellularized conduits with specific architectures is needed.

Purpose of the Study:

• To develop a 3D-printed bio-conduit for peripheral nerve regeneration.
• To investigate the potential of cryopolymerized gelatin methacryloyl (cryoGelMA) gel cellularized with adipose-derived stem cells (ASCs) for nerve repair.

Main Methods:

• Utilized indirect 3D-printing with "lock and key" molds to create structured cryoGelMA conduits.
• Cellularized the cryoGelMA gel with ASCs.
• Evaluated conduit degradation, ASC support (attachment, proliferation, survival), and neurotrophic factor expression in vitro.
• Assessed conduit performance in a rat sciatic nerve defect model (10 mm gap).

Main Results:

• The cryoGelMA conduits supported ASC attachment, proliferation, and survival in vitro.
• Conduits demonstrated degradability within 2-4 months in vivo.
• Implanted bio-conduits facilitated re-innervation across a 10 mm sciatic nerve gap in rats.
• Functional and histological outcomes were comparable to autografts.

Conclusions:

• Indirect 3D-printing enables the fabrication of cellularized, designer conduits for peripheral nerve regeneration.
• The developed cryoGelMA bio-conduit shows significant potential for clinical translation in nerve repair.