Psoralen Photosensitization of L 1210 Leukaemia Cells: an Approach to a New Combined Therapy

Abstract
Psoralen photosensitization of L1210 mouse leukemia cells has a strong effect on DNA and RNA syntheses and this result appears connected with the psoralen photobinding to DNA. Protein synthesis is less sensitive and its inhibition seems due to a different photochemical interaction, likely to psoralen photobinding to RNA. Combined therapy using cyclophosphamide and psoralen-photoinactivated L1210 cells was performed after leukemia transplant, showing a significant decrease in mortality, even in comparison with simple treatment with the alkylating drug.

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