Electrophilic xenobiotics and endogenous electrophilic metabolites

Electrophilic xenobiotics and endogenous electrophilic metabolites are chemically reactive molecules characterized by electron-deficient centers that readily form covalent bonds with nucleophilic sites on cellular macromolecules like DNA and proteins [1]. Endogenous electrophiles, such as 4-hydroxynonenal, often arise from lipid peroxidation or oxidative stress, while xenobiotic electrophiles are frequently generated through the metabolic activation of drugs, such as the formation of NAPQI from paracetamol [2]. These species are not traditional therapeutic targets like receptors or enzymes; rather, they are reactive agents that cause cellular damage and trigger protective signaling pathways [3]. The primary biological sensor for these molecules is the Keap1-Nrf2 system, which orchestrates the antioxidant response to neutralize electrophilic stress [4]. Pharmacological strategies involve the use of nucleophilic scavengers like N-acetylcysteine to directly bind and inactivate these species or the use of Nrf2 activators to upregulate endogenous detoxification enzymes [5]. Chronic exposure or inadequate clearance of these electrophiles is strongly associated with the pathogenesis of cancer, neurodegeneration, and organ toxicity [6].

Other names

Reactive electrophilesElectrophilic speciesReactive metabolitesElectrophilic stressors