Redox-active species and metal ions

Redox-active species and metal ions encompass a broad category of chemically reactive molecules and inorganic elements that are central to cellular metabolism and signaling (Halliwell & Gutteridge, 2015, Oxford University Press). Reactive oxygen species (ROS) and reactive nitrogen species (RNS) are produced as byproducts of aerobic respiration and immune responses, serving as secondary messengers at physiological concentrations (Sies et al., 2017, Nature Reviews Molecular Cell Biology). Transition metal ions, such as iron (Fe) and copper (Cu), are essential enzymatic cofactors but can catalyze the production of toxic hydroxyl radicals through Fenton-type chemistry when present in excess (Emerit et al., 2001, Biomedicine & Pharmacotherapy). Pathological accumulation of these species leads to oxidative stress, causing damage to DNA, proteins, and lipids, which is a hallmark of neurodegeneration, cardiovascular disease, and cancer (Barnham et al., 2004, Nature Reviews Drug Discovery). Pharmacological intervention typically involves the use of chelating agents to remove excess metals or antioxidants and scavengers to neutralize reactive species and restore redox homeostasis (Jomova & Valko, 2011, Toxicology). These therapies are critical in managing conditions like Wilson's disease and iron overload, though they must be carefully managed to avoid depleting essential trace elements (Abbaspour et al., 2014, Journal of Research in Medical Sciences).

Other names

Reactive oxygen speciesROSReactive nitrogen speciesRNSFree radicalsBiometalsTransition metalsOxidants

Chelation of transition metal ions to prevent radical generation; scavenging of reactive oxygen and nitrogen species to mitigate oxidative damage; restoration of cellular antioxidant capacity.