Reactive oxygen species and electrophilic cytotoxic metabolites (ROS)

Reactive oxygen species (ROS) and electrophilic cytotoxic metabolites are highly reactive chemical entities that play dual roles in cellular physiology and pathology. ROS, including superoxide radicals and hydrogen peroxide, are produced during mitochondrial respiration and by enzymes like NADPH oxidase, serving as important signaling molecules at low levels but causing oxidative stress when in excess (NIH, PMC3184498). Electrophilic metabolites are often reactive intermediates formed during the metabolism of drugs or toxins, such as the paracetamol metabolite N-acetyl-p-benzoquinone imine (NAPQI), which can cause cell death by binding to vital proteins and DNA (PubMed, 15922011). Therapeutic intervention typically involves the use of scavengers or antioxidants, such as N-acetylcysteine or Mesna, which chemically neutralize these species or bolster the cell's endogenous detoxification systems (PubChem). While not traditional protein targets like receptors or enzymes, managing the levels of these reactive species is critical in treating conditions ranging from acute drug toxicity to chronic inflammatory and neurodegenerative diseases (StatPearls, NBK459141). These molecules are often monitored via biomarkers of oxidative damage, such as malondialdehyde or 8-hydroxy-2'-deoxyguanosine, to assess the extent of cellular stress (PubMed, 25915737).

Other names

Reactive oxygen speciesROSElectrophilic metabolitesReactive intermediatesOxidantsFree radicalsReactive oxygen species and electrophilic cytotoxic metabolites

Direct chemical neutralization or scavenging of reactive species and covalent conjugation with electrophilic intermediates to prevent damage to cellular macromolecules.