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• W2021928105 endingPage "919" @default.
• W2021928105 startingPage "908" @default.
• W2021928105 abstract "Previous studies showed that long-wave ultraviolet (UVA) radiation induces severe skin damage through the generation of reactive oxygen species and the depletion of endogenous antioxidant systems. Recent results from our laboratory indicate a dramatic increase of both lipid peroxidation products (TBARS) and abnormal l-isoaspartyl residues, marker of protein damage, in UVA-irradiated human melanoma cells. In this study, the effects of hydroxytyrosol (DOPET), the major antioxidant compound present in olive oil, on UVA-induced cell damages, have been investigated, using a human melanoma cell line (M14) as a model system. In UVA-irradiated M14 cells, a protective effect of DOPET in preventing the uprise of typical markers of oxidative stress, such as TBARS and 2′7′-dichlorofluorescein (DCF) fluorescence intensity, was observed. In addition, DOPET prevents the increase of altered l-isoAsp residues induced by UVA irradiation. These protective effects are dose dependent, reaching the maximum at 400 μM DOPET. At higher concentrations, DOPET causes an arrest of M14 cell proliferation and acts as a proapoptotic stimulus by activating caspase-3 activity. In the investigated model system, DOPET is quantitatively converted into its methylated derivative, endowed with a radical scavenging ability comparable to that of its parent compound. These findings are in line with the hypothesis that the oxidative stress plays a major role in mediating the UVA-induced protein damage. Results suggest that DOPET may exerts differential effects on melanoma cells according to the dose employed and this must always be taken into account when olive oil-derived large consumer products, including cosmetics and functional foods, are employed." @default.
• W2021928105 created "2016-06-24" @default.
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• W2021928105 date "2005-04-01" @default.
• W2021928105 modified "2023-09-27" @default.
• W2021928105 title "Hydroxytyrosol, a natural antioxidant from olive oil, prevents protein damage induced by long-wave ultraviolet radiation in melanoma cells" @default.
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• W2021928105 doi "https://doi.org/10.1016/j.freeradbiomed.2004.12.015" @default.
• W2021928105 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/15749387" @default.
• W2021928105 hasPublicationYear "2005" @default.
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