Reactive oxygen species and electrophilic drug metabolites (ROS/EDM)

Reactive oxygen species (ROS) and electrophilic drug metabolites are highly reactive chemical entities that play a dual role in physiology and pathology. ROS, including superoxide radicals and hydrogen peroxide, are natural byproducts of mitochondrial respiration and enzymatic activities like those of NADPH oxidase, serving as signaling molecules at low concentrations but causing oxidative stress at high levels (NIH, 2022). Electrophilic drug metabolites are typically generated during Phase I metabolism, often by Cytochrome P450 enzymes, and possess a high affinity for nucleophilic sites on cellular proteins and DNA (PubMed, 2018). The accumulation of these species leads to irreversible damage to cellular components, contributing to the pathogenesis of cancer, neurodegeneration, and cardiovascular diseases. In pharmacology, these are not traditional protein targets but are instead the focus of detoxification strategies; for instance, N-acetylcysteine is used to replenish glutathione stores to neutralize the reactive metabolite NAPQI in acetaminophen toxicity (StatPearls, 2023). Understanding the formation and clearance of these reactive species is critical for assessing drug safety and developing antioxidant therapies.

Other names

Reactive oxygen speciesROSElectrophilic metabolitesReactive intermediatesOxidantsFree radicalsReactive oxygen metabolites

Neutralization of reactive species through scavenging, covalent conjugation, or enzymatic reduction to prevent cellular macromolecule damage.