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Human skin explants an in vitro approach for assessing UVB induced damage
1Lebanese American University, Byblos, Lebanon; University of New South Wales, Sydney, Australia.
Summary
Frequent outdoor activities increase harmful ultraviolet light (UVB) exposure. This study found UVB causes skin inflammation and epidermal changes, but not significant cell damage, using human skin explants.
Area of Science:
- Dermatology
- Photobiology
- In vitro skin research
Background:
- Increased outdoor activities lead to greater exposure to harmful ultraviolet B (UVB) radiation.
- Understanding acute UVB effects on human skin is crucial for developing protective strategies.
Purpose of the Study:
- To evaluate the acute effects of UVB irradiation on freshly excised human skin.
- To assess UVB-induced cellular and skin damage using an in vitro model.
Main Methods:
- Freshly excised human skin explants were subjected to various UVB doses (0-3.76 J/cm²).
- Damage was assessed immediately and 24 hours post-exposure using MTS cytotoxicity assay, LDH leakage, and immunohistochemical staining (H&E, HLA-DR, anti-cytokeratin).
Main Results:
- No significant loss of skin integrity or acute mitochondrial damage was observed via MTS assay.
- Significant extracellular lactate dehydrogenase (LDH) leakage and upregulation of inflammatory cytokines like IL-1β were detected.
- UVB exposure caused significant epidermal changes, basal cell activation, and Langerhans cell depletion.
Conclusions:
- Freshly excised human skin explants are a viable model for studying UVB-induced skin damage.
- The model effectively measures UVB-induced inflammation and epidermal alterations, offering advantages over reconstructed skin models.
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