Harmful effects of UVA on the structure and barrier function of engineered human cutaneous tissues

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Abstract
Purpose : To investigate the effects of a single UVA exposure on engineered human cutaneous tissues. Materials and methods : Skin equivalents (SE) were obtained by culturing keratinocytes on fibroblast-populated collagen gels; epidermal equivalents (EE) were obtained by seeding keratinocytes on non-populated collagen gels. After maturation and differentiation of the epidermis, SE and EE were exposed to 50 or 100 J/cm2 UVA. Structural damage and total epidermal lipids were analysed and diffusion of radioactive oestradiol was monitored 24 and 72h post-irradiation. Results : Twenty-four hours after UVA irradiation, a disorganization of the living epidermis is observed. UVA also significantly reduced the skin barrier function and led to an increase in phospholipid and in a decrease of ceramide levels. However, both the structure and the barrier function of SE were recovered 72h post-irradiation, thereby suggesting that an intrinsic repair process might exist within the irradiated SE. Conclusion : This study provides a strong evidence that UVA radiation alters both the epidermal and dermal structures, the synthesis of epidermal lipids, and the permeability of the human skin.

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