Oxidative stress mediator (None.)

The term "oxidative stress mediator" does not refer to any one canonical protein or receptor but encompasses various molecules—including reactive oxygen species like superoxide anion (O2-), hydrogen peroxide (H2O2), hydroxyl radical (.OH), lipid peroxides—and enzymes such as NADPH oxidases and xanthine oxidase that produce these species. These mediators play central roles in cell signaling ("redox signaling"), immune responses, inflammation resolution via specialized pro-resolving lipid mediators derived from polyunsaturated fatty acids, and can contribute to tissue injury when present at excessive levels. Dysregulation leads to pathologies including cardiovascular disease, neurodegeneration, cancer progression, diabetes complications and chronic inflammation. Because the concept covers multiple classes of molecules rather than one discrete druggable target or gene product—unlike "estrogen receptor" or "Janus kinase"—it should not be treated as a canonical therapeutic target itself.[1][2][3]

Other names

Reactive oxygen species (ROS) mediatorsRedox signaling moleculesOxidant mediators

Drugs targeting oxidative stress generally act by:\n - Scavenging reactive oxygen/nitrogen species directly,\n - Enhancing endogenous antioxidant defenses,\n - Inhibiting enzymes that generate ROS/RNS,\n - Modulating redox-sensitive signaling pathways.