Curcumin and resveratrol act by different ways on NADPH oxidase activity and reactive oxygen species produced by equine neutrophils

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• 作者：S ; rine Derochette ; Thierry Franck ; Ange Mouithys-Mickalad ; Justine Ceusters ; Ginette Deby-Dupont ; Jean-Philippe Lejeune ; Philippe Neven ; Didier Serteyn
• 关键词：Cell-free assay ; Equine NADPH oxidase ; Curcumin ; Resveratrol ; Neutrophils
• 刊名：Chemico-Biological Interactions
• 出版年：25 November, 2013
• 年：2013
• 卷：206
• 期：2
• 页码：186-193
• 全文大小：743 K

文摘

In neutrophils (PMNs), superoxide anion (O₂^{鈭?/sup>), the first reactive oxygen species (ROS) produced to kill pathogenic agents, is generated by NADPH oxidase, an enzymatic complex formed by the translocation of cytosolic subunits to the membrane flavocytochrome b₅₅₈. In horses, excessive activation of PMNs is often associated with deadly pathologies and the modulation of their ROS production by acting on NADPH oxidase is a prime target to manage inflammation. We developed a cell-free assay to measure the activity of equine NADPH oxidase assembled in vitro, in order to test the effects of natural or synthetic compounds on the enzyme activity or assembly. The cell-free assay was validated with diphenyleneiodonium chloride and Gp91ds-tat, two inhibitors largely described for human NADPH oxidase. The anti-oxidant effects of curcumin and resveratrol at final concentration ranging from 10鈭? to 10鈭? M were studied on whole cells by chemiluminescence (CL) and by cell-free assay, in which the molecule was added before or after the enzyme assembly. The CL assay demonstrated that curcumin efficiently inhibited the O₂鈭?/sup> production and easily entered into PMNs or interacted with their membrane. Cell-free assay showed that curcumin acted on the reconstitution of NADPH oxidase even at 10鈭? M, while resveratrol appeared to be an O₂鈭?/sup> scavenger rather than an inhibitor of NADPH oxidase activity, since it acted from outside the cell in CL and after the complex assembly in cell-free assay. By acting directly on NADPH oxidase, curcumin should be a good candidate for the treatment of acute or inflammatory diseases involving an excessive ROS production.}