Biomaterial and Hydrogel Strategies for Regenerative Microenvironment Reconstruction in Peripheral Nerve Conduits.

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Neuroscience

Background:

• Peripheral nerve injury (PNI) leads to significant functional loss and chronic pain.
• Autologous nerve grafting is limited by donor site issues and tissue availability.
• Current nerve guidance conduits (NGCs) fail to fully support nerve regeneration due to suboptimal microenvironments.

Purpose of the Study:

• To review recent advances in reconstructing the NGC microenvironment for enhanced peripheral nerve repair.
• To highlight biomaterial strategies, especially hydrogels, for spatiotemporally controlled regeneration.
• To outline design principles for next-generation NGCs to bridge the efficacy gap with autografts.

Main Methods:

• Synthesis of recent research on NGC microenvironment engineering.
• Focus on Schwann cell activation, immunomodulation, and angiogenesis within NGCs.
• Emphasis on advanced hydrogel biomaterials integrating physical, biochemical, and dynamic cues.

Main Results:

• Rebuilding the NGC microenvironment is key to effective peripheral nerve regeneration.
• Strategies include regulating Schwann cells, modulating immune responses, and promoting angiogenesis.
• Advanced hydrogels offer tunable platforms for spatiotemporally programmed regeneration.

Conclusions:

• Optimizing the NGC microenvironment is crucial for overcoming limitations in peripheral nerve repair.
• Next-generation NGCs require dynamic, stage-specific regulation of biological cues.
• Biomaterial innovations, particularly hydrogels, are vital for advancing NGC technology and clinical translation.