Evaluation of UVA-induced oxidative stress using a highly sensitive chemiluminescence method

Oxidative stress is mainly mediated by reactive oxygen species (ROS). Evaluation of oxidative stress is helpful for choosing an appropriate method to protect the organism from the oxidative damage. In this study, a highly sensitive and simple chemiluminescence method is presented for the evaluation of radiation-induced oxidative stress in human peripheral lymphocytes. The lymphocytes were irradiated by ultraviolet radiation (320-400nm, UVA) with different doses. The ROS generated by the lymphocytes was detected by chemiluminescence method, using a highly sensitive chemiluminescence probe 2-methyl-6-(p-methoxyphenyl)-3,7-dihydroimidazo[1,2-α] pyrazin-3-one (MCLA). The cell viability was detected with Cell Counting Kit-8 (CCK-8). The malondialdehyde (MDA), a marker of lipid peroxidation and oxidative stress, and the total antioxidant capacity (TAC), a parameter that is taken as evidence of oxidative stress, were measured too. The results show that both chemiluminescence intensity, cell mortality and MDA concentration of lymphocytes grow with the increase of UVA dose range from 0.5 to 8 J/cm2, while the TAC decreases. There exists a positive relationship between cell oxidative damage degree and the chemiluminescence intensity of lymphocytes. This highly sensitive chemiluminescence method would potentially provide an easy way to evaluate the level of UVA-induced oxidative stress readily, sensitively and rapidly

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