Coriandrum sativum L. Protects Human Keratinocytes from Oxidative Stress by Regulating Oxidative Defense Systems

Background: Oxidative radicals are major environmental causes of human skin damage. Oxidative defense factors, including nuclear factor erythroid-derived 2-related factor 2 (Nrf2), are centrally involved in repairing skin cells or protecting them from oxidative damage. Coriandrum sativum L. (coriander; CS) is a commonly consumed food and a traditional phytomedicine in Asia and Europe. In this study, we examined the protective effects of a standardized CS leaf extract against oxidative stress in human HaCaT keratinocytes. Methods and Results: CS significantly and dose-dependently protected cells against reduced cell viability caused by H2O2-induced damage, as assessed using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay. Other assays demonstrated that CS protected HaCaT cells by increasing the levels of glutathione and activities of oxidative defense enzymes, such as superoxide dismutase and catalase. Moreover, it increased the expression of activated Nrf2, which plays a crucial role in protecting skin cells against oxidative stress. Conclusion: These results suggest that CS protects human keratinocytes from H2O2-induced oxidative stress through antioxidant effects. Copyright (C) 2012 S. Karger AG, Basel