A New Ex Vivo Human Skin Burn Model

Area of Science:

• Biomedical Engineering
• Dermatology
• Regenerative Medicine

Background:

• Current preclinical burn research predominantly relies on animal models, posing ethical and physiological limitations.
• Optimized ex vivo systems offer a promising alternative to animal testing for burn research.
• Developing human skin models is crucial for accurate preclinical testing.

Purpose of the Study:

• To establish a reproducible ex vivo human skin burn model using a pulsed dye laser.
• To determine laser parameters for inducing predictable burn degrees (first, second, and third).
• To evaluate the healing and re-epithelialization capacity of the ex vivo model.

Main Methods:

• Human abdominal skin samples were obtained post-surgery.
• Burn injuries were induced using a pulsed dye laser with varied parameters (fluence, pulse number, duration).
• Histological and dermatopathological analyses were performed on 70 burn injuries; healing was assessed over 21 days.

Main Results:

• Pulsed dye laser parameters were identified to reliably induce first, second (superficial and deep), and third-degree burns.
• The ex vivo model demonstrated spontaneous healing and neo-epidermis formation within 21 days.
• The process was user-independent, rapid, and generated reproducible, uniform burns closely mimicking clinical reality.

Conclusions:

• The developed ex vivo human skin burn model provides a viable, ethical alternative to animal experimentation for preclinical research.
• This model enables standardized testing of new burn treatments on predictable burn degrees, potentially improving therapeutic strategies.
• The model is suitable for large-scale preclinical screening and advancing burn care research.