Summary
Sunburn cell (SC) formation, a quantifiable measure of epidermal cell injury induced in mouse ear skin by ultraviolet-B (UVB) radiation (290–320 nm), was significantly decreased by pre-exposure to infrared radiation (IR), which elevated the surface temperature of ear lobes to 37–42°C. An autoradiographic study demonstrated that the basal cell labelling indices were significantly reduced in a surface temperature-dependent manner by pre-exposure to IR. Taken together with our previous findings that SC formation depends upon the ratio of cycling to non-cycling cells, the present findings suggest that IR retards the cell cycle and, as a result, decreases SC formation. SC counts were not altered by post-UVB exposure to IR. The effect of IR or the IR-induced increase in surface temperature should be considered when studying cutaneous damage by UVB and sunlight.
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Danno, K., Horio, T. & Imamura, S. Infrared radiation suppresses ultraviolet B-induced sunburn-cell formation. Arch Dermatol Res 284, 92–94 (1992). https://doi.org/10.1007/BF00373376
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DOI: https://doi.org/10.1007/BF00373376