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In order to study the effects of repeated UVB exposures on the epidermal antioxidant defence system, we obtained epidermis samples from male volunteers who were exposed to chronic UVB irradiation. Chronic UVB irradiation was shown to be accompanied by induction of epidermal superoxide dismutase (SOD) activity in vivo, while the activities of the other antioxidant enzymes were not significantly changed. The repeated exposure of the epidermis to UVB irradiation was not accompanied by accumulation of products of lipid peroxidation reactions. As superoxide dismutase is of major importance in scavenging the reactive oxygen species, the UVB-induced changes in SOD activity might provide the epidermis a way of defending itself against the effects of chronic UVB irradiation.
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