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Streamlining Skin Regeneration: A Ready-To-Use Silk Bilayer Wound Dressing.

Anabela Veiga1,2,3, Inês V Silva1, Juliana R Dias4

  • 1Universidade Católica Portuguesa, CBQF-Centro de Biotecnologia e Química Fina-Laboratório Associado, Escola Superior de Biotecnologia, Rua Diogo Botelho 1327, 4169-005 Porto, Portugal.

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This study introduces a novel silk protein bilayer wound dressing. The silk sericin hydrogel and silk fibroin scaffold promote healing for exudative wounds, offering advanced tissue engineering solutions.

Keywords:
bilayersilk fibroinsilk sericinwound dressing

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Regenerative Medicine

Background:

  • Silk proteins, including silk fibroin (SF) and sericin (SS), are recognized for biocompatibility and mechanical properties in tissue engineering.
  • Silk fibroin (SF) offers structural stability for protective layers, while sericin (SS) shows potential as a cell-interactive hydrogel for wound healing.
  • Existing wound dressings often lack the dual functionality needed for complex wound environments.

Purpose of the Study:

  • To develop and characterize a novel silk sericin/silk fibroin (SS/SF) bilayer construct for full-thickness exudative wound healing.
  • To investigate the potential of cryopreserved sericin as a hydrogel layer integrated with a silk fibroin scaffold.
  • To establish a scalable sterilization method using supercritical carbon dioxide (sCO2) for the bilayer dressing.

Main Methods:

  • Fabrication of an SS/SF bilayer construct using cryopreservation of SS for hydrogel formation and salt-leaching for SF scaffold creation.
  • Integration of the SS hydrogel layer with the SF scaffold to form a bilayer structure.
  • Sterilization of the construct using supercritical carbon dioxide (sCO2) technology.

Main Results:

  • The SS/SF bilayer dressing exhibited high porosity (>85%) and interconnectivity.
  • The material demonstrated significant promotion of human dermal fibroblast (HDF) adhesion, proliferation, and infiltration.
  • Distinct secondary structures, pore sizes, and swelling properties were observed between the SS and SF layers, enabling dual-phase wound management.

Conclusions:

  • The developed SS/SF bilayer construct represents an innovative approach to wound dressing fabrication for exudative wounds.
  • The unique properties of the SS hydrogel layer and SF scaffold offer tailored functionalities for different stages of wound healing.
  • This dual-phased system holds transformative potential for biomedical therapeutics and tissue engineering applications.