A 32P-HPLC method was applied to study the induction of UVB- and UVC-induced DNA lesions (cyclobutane dimers, 6-4 photoproducts and Dewar isomers) in human skin explants. The employed technique was sensitive enough to detect the lesions at a dose of 10 J/m2 UVB. Comparison of photoadduct formation under UVC and UVB indicated the importance of photosensitization pathways in DNA damage. Dewar isomers were detected only at a high dose of UVB. The compounds were identified by their photochemical reactivity and by spiking with prepared standards. Treatment with nuclease P1 was used to identify the 5'-terminal nucleotide. UVA caused no detectable adducts.
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