Biodegradable magnesium wire promotes regeneration of compressed sciatic nerves

Area of Science:

• Biomaterials Science
• Neuroscience
• Regenerative Medicine

Background:

• Biodegradable magnesium (Mg) exhibits anti-inflammatory properties.
• Mg can stimulate Schwann cells to secrete nerve growth factor (NGF).
• Mg shows potential in promoting nerve axon regeneration after central nervous system injury.

Purpose of the Study:

• To investigate the efficacy of biodegradable AZ31 Mg wire in enhancing peripheral nerve regeneration.
• To assess the impact of Mg wire on nerve function and histological recovery following sciatic nerve compression.

Main Methods:

• An acute sciatic nerve compression model was established in rats.
• AZ31 Mg wire was used to bridge the compressed nerve segments.
• Sciatic functional index, NGF, p75 neurotrophin receptor (p75NTR), and tyrosine receptor kinase A (TrkA) mRNA expression were measured.
• Nerve fiber counts, regenerating axon numbers, and myelin sheath coverage were analyzed via immunofluorescence histopathology.

Main Results:

• Mg wire treatment significantly increased sciatic functional index and expression of NGF, p75NTR, and TrkA mRNA.
• The number of cross-section nerve fibers and regenerating axons increased in the Mg-treated group.
• Histological analysis revealed enhanced axonal regeneration and improved myelin sheath coverage in the injured sciatic nerve following Mg treatment.

Conclusions:

• Biodegradable Mg wire effectively promotes the regeneration of acutely compressed peripheral sciatic nerves.
• Mg wire treatment improves sciatic nerve function and histological outcomes.
• Mg wire serves as a promising biomaterial for peripheral nerve repair strategies.