In vitro phototoxicity test using artificial skin with melanocytes.

Area of Science:

• Dermatology and in vitro toxicology.
• Development of advanced skin models for research.

Background:

• Ultraviolet radiation (UVR) exposure causes skin changes and phototoxic reactions.
• Need for reliable in vitro models to assess phototoxicity of topical agents.

Purpose of the Study:

• Evaluate artificial skin (AS) with keratinocytes and melanocytes as an in vitro phototoxicity model.
• Compare AS with and without melanocytes for UV response.

Main Methods:

• Manufactured AS using 3D cultured keratinocytes and melanocytes on de-epidermized dermis (DED).
• Assessed photobiological responses to UVA exposure.
• Applied test chemicals and analyzed inflammatory cytokine release (IL-1alpha, IL-beta, IL-6).

Main Results:

• AS with melanocytes demonstrated superior epidermal structure and UVA resistance.
• Photobiological responses in AS with melanocytes closely mimicked in vivo human skin.
• Elevated IL-6 levels correlated significantly with chemical phototoxicity and UVA exposure, indicating its potential as a reliable marker.

Conclusions:

• Artificial skin (AS) incorporating melanocytes is a valuable tool for studying UV-induced skin changes.
• This AS model shows promise as an in vitro phototoxicity test for topical agents.