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UV radiation is known to cause photoaging of the skin and is considered one of the leading cause of developing skin carcinogenesis. Melatonin which has a highly lipophilic molecular structure facilita-ting penetration of cel membranes and serving as an extra- and intracellular free radical scavenger has been demonstrated to protect photodamage of have examined the role of melatonin in response to UVB induced photodamaging proces, using human skin fibroblasts in vitro. Cell survival cur-ves after UVB iradiation showed dose-dependent decrease. Only 60% of fibroblasts were survived at 140 mJ/cm2UVB irradiation. By pre-cultivation of cells with melatonin (10 nM), a significant number of cels remained unaffected. After UVB iradiation with 70 mJ/cm2, the level of putrescine was 1.70.3 fold increased compared to mela-transcriptional level of ornithine decarboxylase (ODC) gene expression was increased by UVB ir-radiation and prohibited by melatonin. These re-sults indicated that melatonin was effectively able to neutralize membrane peroxidation when present in relevant concentration during UVB irradiation and diminishes the UVB-induced increase of poly-amine synthesis and ODC gene expression. Col-lectively, ODC response to UVB induced changes are possibly involves a melatonin or antioxidant sensitive regulatory pathway in normal human skin fibroblast.

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