Ferrous iron and redox-active metal ions (Fe2+)

Ferrous iron (Fe2+) and other redox-active metal ions, such as copper (Cu+), are essential trace elements that serve as critical cofactors for enzymes involved in oxygen transport, DNA synthesis, and mitochondrial electron transport (Source: PubMed, PMID: 29374220). However, when these ions exist in a 'labile' or unbound state, they can catalyze the formation of highly reactive hydroxyl radicals via the Fenton reaction, leading to lipid peroxidation and a specific form of regulated cell death known as ferroptosis (Source: Nature Reviews Molecular Cell Biology). Pathological accumulation of these metals is a hallmark of several conditions, including hereditary hemochromatosis, transfusion-dependent thalassemia, and Wilson's disease. In clinical practice, these ions are targeted by chelating agents that bind the metal to facilitate its excretion or neutralize its redox activity. Beyond classic metal overload syndromes, the modulation of redox-active metals is an area of intense research for neurodegenerative disorders like Alzheimer's and Parkinson's diseases, where metal dysregulation contributes to protein aggregation and oxidative damage (Source: NIH, 'Iron and Neurodegeneration'). Therapeutic strategies aim to balance the necessity of these metals for cellular function with the prevention of their toxic, pro-oxidant effects.

Other names

Labile iron poolFe(II)Divalent metal ionsTransition metal ionsFree ironRedox-active metals

Chelation of metal ions to form stable, water-soluble complexes that are subsequently excreted via the kidneys or bile, thereby preventing the generation of reactive oxygen species (ROS) through Fenton and Haber-Weiss chemistry (Source: StatPearls, 'Chelating Agents').