Reactive oxygen species and lipid-derived radicals (ROS/LDR)

Reactive oxygen species (ROS) and lipid-derived radicals are highly reactive chemical species formed as natural byproducts of oxygen metabolism and lipid peroxidation. While they play essential roles in cell signaling and the immune response at low concentrations, an imbalance between their production and the body's antioxidant defenses leads to oxidative stress. This state causes significant damage to cellular components, including DNA, proteins, and membrane lipids, contributing to the pathogenesis of numerous conditions such as neurodegenerative diseases, cardiovascular disorders, and cancer (Source: NIH, PubMed). In a therapeutic context, these molecules are targeted by antioxidants and radical scavengers designed to neutralize them before they can cause irreversible cellular damage. Drugs like edaravone and N-acetylcysteine act by directly reacting with these species or by boosting endogenous antioxidant systems like glutathione. However, targeting ROS is challenging because complete suppression can interfere with vital physiological processes, such as the oxidative burst used by white blood cells to kill pathogens (Source: StatPearls, Wikipedia).

Other names

ROSLipid radicalsReactive oxygen speciesLipid peroxyl radicalsSuperoxideHydroxyl radicalHydrogen peroxideSinglet oxygenLipid hydroperoxides

Direct scavenging of free radicals, neutralization of reactive oxygen species, and inhibition of lipid peroxidation chain reactions.