Three-dimensional tissue models of normal and diseased skin

Area of Science:

• Tissue Engineering
• Dermatology
• Cell Biology

Background:

• Two-dimensional (2D) cell culture systems fail to replicate the complex spatial organization of epidermal cells found in vivo.
• Optimal cell signaling for growth and differentiation requires in vivo-like architectural features, which are lost in 2D cultures.
• Three-dimensional (3D) tissue models are needed to bridge the gap between 2D cultures and in vivo systems.

Purpose of the Study:

• To describe the fabrication of human skin equivalents (HSEs) as advanced in vitro models.
• To enable the generation of human tissues that accurately mimic native skin morphology, differentiation, and growth.
• To provide powerful tools for studying human skin diseases, including cancer and wound re-epithelialization.

Main Methods:

• Fabrication of HSEs involves growing a stratified squamous epithelium at an air-liquid interface.
• A collagen matrix populated with dermal fibroblasts serves as the scaffold for epithelial growth.
• The resulting 3D tissue structure mimics key features of native human skin.

Main Results:

• HSEs exhibit in vivo-like epithelial differentiation and morphology.
• Rates of cell division in HSEs are comparable to those observed in human skin.
• These 3D models successfully replicate architectural features lost in 2D culture systems.

Conclusions:

• Human skin equivalents provide a robust platform for studying epidermal cell biology.
• HSEs serve as valuable experimental systems for investigating skin disease mechanisms.
• The fabrication of HSEs offers novel tools for research in dermatology and regenerative medicine.