Reactive oxygen species and electrophilic small molecules (ROS/RES)

Reactive oxygen species (ROS) and electrophilic small molecules are highly reactive chemical entities that serve as both critical signaling molecules and mediators of cellular damage. ROS, such as superoxide and hydrogen peroxide, are primarily generated as byproducts of mitochondrial respiration or by specialized enzymes like NADPH oxidases (Sies & Jones, 2020, Nature Reviews Molecular Cell Biology). Electrophilic small molecules, including reactive aldehydes like 4-hydroxynonenal, often arise from lipid peroxidation or the metabolism of xenobiotics (Parvez et al., 2018, Chemical Research in Toxicology). While low levels of these species are essential for physiological processes like redox signaling and immune defense, their accumulation leads to oxidative and electrophilic stress, causing irreversible damage to DNA, proteins, and lipids (Pizzino et al., 2017, Oxidative Medicine and Cellular Longevity). This damage is a key driver in the pathogenesis of cancer, cardiovascular diseases, and neurodegenerative disorders such as Alzheimer's disease (Forman & Zhang, 2021, Nature Reviews Drug Discovery). Pharmacological strategies targeting these species involve direct scavenging by antioxidants like N-acetylcysteine or the use of nucleophilic agents such as Mesna to neutralize reactive electrophiles before they can form harmful covalent adducts with cellular targets (PubChem, 2024; FDA, 2023).

Other names

OxidantsFree radicalsReactive electrophilic speciesPro-oxidantsReactive oxygen intermediatesElectrophilic stress agents

Direct chemical scavenging of free radicals, nucleophilic neutralization of electrophilic metabolites, and restoration of endogenous antioxidant capacity to prevent macromolecular adduction and oxidative damage.