Skin irritation testing using human iPSCs derived 3D skin equivalent model

Area of Science:

• Biotechnology
• Tissue Engineering
• Dermatology

Background:

• 3D skin equivalent models (SKEs) are crucial for cosmetic ingredient evaluation and skin regeneration research.
• Limitations of primary skin cells include donor variability and challenges in genotype-specific studies.
• Human-induced pluripotent stem cells (hiPSCs) offer a potential solution for creating standardized skin models.

Purpose of the Study:

• To develop a protocol for differentiating high-purity skin cells (fibroblasts and keratinocytes) from hiPSCs.
• To construct a functional 3D hiPSC-derived SKE (hiPSC-SKE).
• To validate the hiPSC-SKE's structural and functional resemblance to native human skin.

Main Methods:

• Differentiated hiPSCs into high-purity human fibroblasts (hFIBROs) and keratinocytes (hKERAs).
• Constructed the hiPSC-SKE by layering hKERAs onto a collagen-hFIBROs dermis and inducing keratinization.
• Performed histological analysis (H&E staining) and assessed functional response to Triton X-100.

Main Results:

• Successfully differentiated hiPSCs into hFIBROs and hKERAs.
• The hiPSC-SKE exhibited a layered architecture similar to native human skin with appropriate marker expression.
• The model showed significant epidermal damage and reduced cell viability upon exposure to Triton X-100, confirming functional responsiveness.

Conclusions:

• The developed hiPSC-SKE is a viable and reproducible model for skin research.
• This model offers a promising alternative to animal testing for cosmetic and dermatological applications.
• The hiPSC-SKE facilitates genotype-specific studies and overcomes limitations of primary cell-based models.