Sodium alginate-based composites as a collagen substitute for skin bioengineering

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Dermatology

Background:

• Skin comprises epithelial (epidermis) and connective (dermis) tissues.
• Dermis contains fibroblasts and mesenchymal stromal cells within a fibrous matrix.
• Effective skin substitutes require support for both dermal and epidermal cell types.

Purpose of the Study:

• To develop biocompatible composite bilayer scaffolds for skin regeneration.
• To mimic the skin's basement membrane and dermal extracellular matrix.
• To create cost-effective and vascularization-capable skin substitutes.

Main Methods:

• Fabrication of bilayer scaffolds using sodium alginate, collagen, and fibrinogen.
• Cross-linking with Ba²⁺ to control biodegradation rates.
• Characterization of scaffold porosity, pore size (60-300 μm), and tensile strength (3.12-5.26 MPa).
• Biocompatibility testing with human fibroblasts, stromal cells, and keratinocytes.

Main Results:

• Achieved highly interconnected porous structures in the sponge compartment.
• Demonstrated scaffold biocompatibility with key human skin cell types.
• Bilayer alginate scaffolds showed comparable properties to collagen scaffolds but were more cost-effective and vascularization-proficient.

Conclusions:

• Developed composite bilayer scaffolds with tunable properties for skin tissue engineering.
• Alginate-based scaffolds offer a promising, cost-effective alternative for skin substitutes.
• These scaffolds are suitable for reconstructive dermatology and burn treatment applications.