Multimodular Bio-Inspired Organized Structures Guiding Long-Distance Axonal Regeneration.

Area of Science:

• Neuroscience
• Biomaterials Science
• Regenerative Medicine

Background:

• Axonal tracts are crucial for neural function but are disrupted by injuries like peripheral nerve injury (PNI), spinal cord injury (SCI), and traumatic brain injury (TBI).
• Damage to these tracts leads to growth inhibition and loss of guidance, hindering long-distance axonal regeneration.
• Current limitations exist in overcoming these challenges for effective nerve repair.

Purpose of the Study:

• To develop and evaluate a novel multimodular conduit system for promoting long-distance axonal regeneration.
• To investigate the potential of combining poly-L-lactide acid (PLA) fibers, hyaluronic acid (HA) conduits, and Schwann cells (SC) for nerve regeneration.
• To explore the viability of a generated "neural cord" for ex vivo applications.

Main Methods:

• A multimodular conduit was constructed using PLA fiber bundles within a sequence of HA conduits.
• Schwann cells (SC) were pre-cultured within the conduit modules to support axon growth.
• Dorsal root ganglion (DRG) explants were used to initiate and monitor axon outgrowth over 21 days.

Main Results:

• The multimodular conduit effectively promoted directed axon growth from DRG explants.
• The hybrid structure of PLA fibers and SCs within HA modules demonstrated viability outside the conduit.
• This construct, termed a "neural cord," showed potential for independent culture and future transplantation.

Conclusions:

• The developed multimodular conduit is a promising strategy for promoting directed axon growth over long distances.
• The creation of a viable "neural cord" ex vivo opens new avenues for nerve regeneration therapies.
• This approach holds significant potential for treating long tissue defects in the nervous system resulting from injury or disease.