Abstract

Abstract— Formation of crosslinks in DNA by various mono‐ and bifunctional furocoumarins plus UVA light in mouse embryo fibroblasts was evaluated by a NaI density gradient centrifugation method. Angelicin and 3‐carbethoxypsoralen did not form any crosslinks: however, angelicin was slightly carcinogenic for mouse skin, whereas 3‐carbethoxypsoralen was not carcinogenic. Psoralen induced DNA crosslinking, in a dose‐dependent fashion and was highly carcinogenic for mouse skin. In contrast to the psoralen‐induced photoadducts (120 per 106 nucleotides) which were left unrepaired, 41% of the 3‐carbethoxypsoralen adducts (30 per 106 nucleotides) were removed during 1 h of dark post‐incubation.

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