Abstract
Quantitative studies on sunburn cell (SBC) production in mouse epidermis are reported. UV radiation, 260-300 nm, produced a dose related effect with respect to SBC formation. Maximal spectral reactivity was at wavelengths shorter than 300 nm. In 8-methoxypsoralen (8-MOP) photosensitization, SBC were also produced and this response is dose related with respect to long wave UV dose. In fluorescein photosensitization, provoked by 487 nm light, SBC were not produced. The response in 8-MOP photosensitization and 254 nm UV (given alone) differed in respect of time course, but both may be initiated by a DNA lesion.