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• W1993990570 abstract "Cutaneous malignant melanoma is a very serious form of skin cancer that arises from melanocytes. Currently there is no effective treatment for metastatic melanoma so intense clinical trials are evaluating new drugs for this human malignancy. Psoralens are a group of compounds that bind to DNA in rapidly dividing cells and with ultraviolet light in the A band (UVA) cause DNA crosslinking, thereby preventing cellular division. They are used in the treatment of psoriasis and cutaneous T-cell lymphoma among other skin and blood diseases. We have investigated the cytotoxic potential of three psoralen derivatives plus UVA exposure (PUVA) on a established cell line of human melanoma. Cells were treated with different concentrations of 8-methoxypsoralen (8-MOP), 4,5′,8-trimethylpsoralen (TMP) and 7-methylpyridopsoralen (MPP), for 1 h and after exposure to UVA light (0.3 J/cm2) were allowed to recover over a 24–72 h period. Viability was assessed by the microculture 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) colorimetric assay. Cisplatin, one of the most important drugs in the chemotherapy of melanoma, was included for comparative studies. All the psoralen derivatives tested were markedly cytotoxic in a dose and post-exposure-time dependent manner. The IC50 values for 72 h of post-exposure time were as follows: MPP = 0.05 ± 0.01, TMP = 0.13 ± 0.003 and 8-MOP = 10.79 ± 1.85 μmol/L. Regardless of the limitations of the in vitro model, our results suggested that the lower IC50 values of TMP and MPP might be of clinical importance." @default.
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• W1993990570 date "2004-10-01" @default.
• W1993990570 modified "2023-09-23" @default.
• W1993990570 title "Psoralen derivatives and longwave ultraviolet irradiation are active in vitro against human melanoma cell line" @default.
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• W1993990570 doi "https://doi.org/10.1016/j.jphotobiol.2004.07.004" @default.
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