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A bioengineered peripheral nerve construct using aligned peptide amphiphile nanofibers.

Andrew Li1, Akishige Hokugo1, Anisa Yalom1

  • 1Division of Plastic and Reconstructive Surgery, Department of Surgery, David Geffen School of Medicine at UCLA, Los Angeles CA, 90095-6960, USA.

Biomaterials
|July 28, 2014
PubMed
Summary

Peptide amphiphile nanofibers promote nerve regeneration in critical-sized gaps, offering a promising alternative to nerve grafts for peripheral nerve repair.

Keywords:
AlignmentNanofiberNerve conduitPeptide amphiphilePeripheral nerve repairSelf assembly

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Area of Science:

  • Biomaterials Science
  • Neuroscience
  • Regenerative Medicine

Background:

  • Peripheral nerve injuries often require nerve grafts or conduits for repair, but grafts cause donor site morbidity and conduits lack internal support.
  • Existing nerve conduits struggle to support axonal regeneration over long nerve gaps, limiting their efficacy.
  • Peptide amphiphiles (PAs) self-assemble into nanofibers that can mimic native nerve architecture, presenting a potential scaffold for nerve repair.

Purpose of the Study:

  • To evaluate the ability of Schwann cells to adhere and proliferate on bioactive peptide amphiphile (PA) nanofibers.
  • To assess the efficacy of PA-filled nerve conduits in promoting functional recovery in a rat sciatic nerve critical-sized defect model.

Main Methods:

  • Schwann cells were cultured with bioactive PAs (RGDS-PA, IKVAV-PA) to assess cell attachment and proliferation.
  • Rat sciatic nerves with critical-sized defects were repaired using autologous nerve grafts, PLGA conduits with aligned PAs, or left unrepaired.
  • Motor and sensory recovery were evaluated, alongside histological analysis of nerve regeneration.

Main Results:

  • Schwann cells adhered to and proliferated within aligned PA gels, with enhanced efficacy on bioactive PAs.
  • PA-filled conduits facilitated functional recovery comparable to autologous nerve grafts in vivo.
  • Nerve regeneration, including axonal growth and Schwann cell infiltration, was significantly improved with PA constructs compared to empty conduits.

Conclusions:

  • Bioactive peptide amphiphile nanofibers support Schwann cell proliferation and guide axonal regeneration.
  • PA-based nerve conduits represent a promising biomaterial for bioengineered peripheral nerve repair, improving functional recovery in critical-sized defects.