Fig. 4

Survival of cells pre-treated by α-tocopherol under UV irradiation with melanoma A375 cells. These survival rates were calculated using sham-irradiated cell as reference, (n = 3). (a) UV dose (50 kJ m−2) decreases cell survival to 68.8% with α-tocopherol recurrence of 86.5% cell viability. (b) Equivalent UVA dose (100 kJ m−2) gave cell viability loss to 80.6% which is recovered by α-tocopherol to 92.3% cell viability. (c) Finally the equivalent UVB dose (2.5 kJ m−2) given cell viability of 72.1% that finally recovered by α-tocopherol to 84.2% viable cells. Non-pretreatment: black line; α-tocopherol pre-treatment: blue line