In Vitro Functional and Structural Evaluation of Low-Complexity Artificial Human Epidermis for 3D Tissue Engineering

Area of Science:

• Tissue Engineering
• Biomaterials Science
• Dermatology

Background:

• Increasing demand for in vitro human cell systems to replace animal testing in drug development.
• Need for alternatives to animal skin for wound and burn treatments.
• In vitro skin models are crucial for assessing topical product safety and efficacy.

Purpose of the Study:

• To explore the production of artificial epidermis using alginate and GelMA C hydrogel scaffolds.
• To optimize keratinocyte concentration and tissue maturation time for artificial skin development.
• To compare the functional and morphological properties of alginate and GelMA C hydrogels as skin substitutes.

Main Methods:

• Fabrication of artificial epidermis using alginate and GelMA C hydrogels.
• Optimization of keratinocyte seeding density (10-50-100 × 10^6/mL) and maturation periods (fresh, 1, 3, 4 weeks).
• Assessment of hydrogel behavior, structure, cell survival, tissue differentiation (histology, immunohistochemistry), and caffeine permeability.

Main Results:

• GelMA C hydrogel demonstrated superior cell survival and tissue differentiation compared to alginate.
• Optimal conditions identified: 3-week incubation with 50 × 10^6/mL keratinocytes for the GelMA C system.
• Caffeine permeability order: alginate > GelMA C > cellulose acetate membrane > rat skin.

Conclusions:

• GelMA C hydrogel serves as a more favorable scaffold for artificial epidermis development than alginate.
• The optimized conditions provide a foundation for creating effective artificial skin substitutes.
• Further optimization for biocompatibility, physical, and mechanical properties is necessary for clinical application in tissue engineering.