Human skin equivalent as an alternative to animal testing

Area of Science:

• In vitro models
• Tissue engineering
• Dermatology

Background:

• The pharmaceutical industry seeks alternatives to animal testing for drug development.
• In vitro models are increasingly demanded for cell-based assays.
• Ethical and economic factors drive the shift in testing strategies.

Purpose of the Study:

• To present a 3-D human skin equivalent as a viable alternative to animal testing.
• To highlight its utility in assessing novel agents' efficacy and mechanism of action.
• To outline future applications in wound healing, melanoma research, and infection biology.

Main Methods:

• Generation of a skin model using primary human keratinocytes and dermal fibroblasts on a collagen substrate.
• Cultivation at the air-liquid interface to promote epidermal stratification and interaction.
• Utilizing the model for various endpoint analyses, including mRNA and protein levels.

Main Results:

• The 3-D skin equivalent demonstrates physiological comparability to natural skin.
• It allows for full epidermal stratification and epidermal-dermal interactions.
• The model supports tailored donor tissue and multiple molecular analyses.

Conclusions:

• The 3-D skin equivalent is a suitable alternative for in vivo studies, aligning with ethical and economic drivers.
• It facilitates the assessment of diverse endpoints like cell viability, inflammation, and permeation.
• This model supports early-stage drug development and various research areas.