A co-cultured skin model based on cell support membranes.

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Regenerative Medicine

Background:

• Collagen:polycaprolactone (PCL) biocomposites are biocompatible materials supporting skin cell growth.
• Existing methods lack efficient models for skin tissue engineering.
• Mimicking the skin's dermal-epidermal structure is crucial for functional skin models.

Purpose of the Study:

• To develop and validate a co-culture system for creating engineered skin models using collagen:PCL biocomposites.
• To assess the feasibility of a bi-layered skin model with distinct epidermal and dermal layers.
• To evaluate the potential applications in tissue engineering and pharmaceutical screening.

Main Methods:

• Preparation of collagen:PCL biocomposite films with varying ratios (1:4, 1:8, 1:20).
• Development of a designed co-culture system to seed human keratinocytes and mouse 3T3 fibroblasts on opposite sides of the biocomposite membrane.
• Utilizing scanning electron microscopy (SEM) and immunohistochemistry to analyze cell attachment, proliferation, and model structure.

Main Results:

• The 1:20 collagen:PCL biocomposite demonstrated suitability for the co-culture system.
• A 55.3% increase in cell number was observed in the co-culture system compared to single-sided seeding.
• Successful development of a bi-layered skin model with a confluent epidermal sheet and populated fibroblasts after 28 days of co-culture.
• Good cell attachment and proliferation of both cell types were confirmed, with distinct separation on each side of the membrane.

Conclusions:

• The designed co-culture system using 1:20 collagen:PCL biocomposite membranes is effective for creating bi-layered skin models.
• This approach demonstrates the principle of generating engineered skin with differentiated epidermal layers.
• The developed skin model holds potential for applications in tissue engineering and pharmaceutical testing.