Mitochondrial proteomic analysis of isopsoralen protection against oxidative damage in human lens epithelial cells

Objective:To investigate the protective effects of the natural medicinal monomer isopsoralen（ISR） with estrogenic activity against oxidative damage in human lens epithelial cells B3（HLE-B3） caused by hydrogen peroxide（H₂O₂） and to pursue the possible mitochondrial proteomic regularity of the protective effects.Methods: HLE-B3 cells were treated with H₂O₂（300μmol/L）,β-estradiol(E₂:10^-8 mol/L) and H₂O₂,ISR(10^-5 mol/L) and H₂O₂,or left untreated.Altered expressions of all mitochondrial proteins were analyzed by protein array and surfaceenhanced laser desorption ionization time of flight mass spectrometry（SELDI-TOF-MS）.The mass/charge（m/z） ratios of each peak were tested by the Kruskal-Wallis rank sum test,and the protein peak value of the m/z ratio for each treatment by pair comparison was analyzed with the Nemenyi test.Results:H₂O₂ up-regulated the expressions of two protein spots（with m/z of 6532 and 6809）.E₂ mitigated the oxidative damage,and the expression of one protein spot（m/z 6532） was down-regulated.In contrast,ISR down-regulated both of protein spots（m/z 6532 and 6809）.Conclusions:ISR could effectively inhibit H₂O₂-induced oxidative damage in HLE-B3 cells.The protein spot at m/z of 6532 might be the target spot of ISR against oxidative damage induced by H₂O₂.