Reactive Oxygen SpeciesOxidative StressMitochondriaOxygenHydrogen PeroxideAntioxidantsNADPH OxidaseFree Radical ScavengersOxygen ConsumptionSuperoxide DismutaseOxidation-ReductionCatalaseAcetylcysteineSuperoxidesOxidantsApoptosisMembrane Potential, MitochondrialGlutathioneCells, CulturedSignal TransductionLipid PeroxidationOnium CompoundsReactive Nitrogen SpeciesSinglet OxygenXanthine OxidaseCyclic N-OxidesCell SurvivalCell Death