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Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...

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ROS-scavenging lipoic acid-modified chitosan hydrogels with rapid photocrosslinked ability accelerates peripheral

Xianglong Chen1,2, Ren Gao3,4, Xinyue Liang1

  • 1State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, and Hubei Key Discipline Laboratory of Orthopedic Tissue Injury and Repair, Wuhan University of Technology, Wuhan 430070, China.

Regenerative Biomaterials
|April 27, 2026
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Summary

This study presents a novel composite nerve conduit that scavenges reactive oxygen species (ROS) to reduce inflammation and promote peripheral nerve regeneration (PNI). The new conduit significantly improves nerve function and reduces muscle atrophy in rats with PNI.

Keywords:
anti-inflammatoryinjectable hydrogelperipheral nerve regenerationα-lipoic acid

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Neuroscience

Background:

  • Peripheral nerve injury (PNI) causes oxidative stress and inflammation, hindering nerve regeneration and functional recovery.
  • Current nerve conduits face challenges in drug release control, potential cytotoxicity, and inflammation induction from degradation products.

Purpose of the Study:

  • To develop a novel, photo-crosslinkable composite nerve conduit (CS-LA/P(MMD-CL)) for enhanced peripheral nerve regeneration.
  • To investigate the conduit's ability to scavenge reactive oxygen species (ROS), modulate inflammation, and support nerve repair.

Main Methods:

  • Fabrication of a composite conduit integrating lipoic acid-modified chitosan (CS-LA) hydrogel with an oriented P(MMD-CL) structure.
  • Utilized photo-crosslinking (365 nm UV) without a photoinitiator for rapid conduit formation.
  • Evaluated conduit performance through in vivo studies on Sprague Dawley (SD) rats with sciatic nerve defects.

Main Results:

  • The CS-LA/P(MMD-CL) conduit effectively scavenged ROS, reduced inflammation, and promoted nerve regeneration.
  • Demonstrated enhanced cell proliferation, angiogenesis, and improved maturity of the regenerated nerve tissue.
  • Achieved significant functional recovery (SFI: -77.51 ± 1.51), mitigated gastrocnemius muscle atrophy, and showed excellent biosafety without degradation-induced organ damage.

Conclusions:

  • The developed CS-LA/P(MMD-CL) composite nerve conduit is a simple, multifunctional, and biocompatible strategy for peripheral nerve repair.
  • This approach effectively modulates the PNI microenvironment, promoting regeneration and functional recovery.