Iron-containing complexes (Fe-complexes)

Iron-containing complexes in tissue refer to the various physiological and pathological forms of iron storage and utilization, primarily including ferritin, hemosiderin, and the labile iron pool. Iron is an essential element for life, serving as a critical cofactor for hemoglobin, myoglobin, and numerous enzymes involved in electron transport and DNA synthesis. However, when iron levels exceed the capacity of storage proteins, free iron can catalyze the formation of reactive oxygen species via the Fenton reaction, leading to oxidative stress, lipid peroxidation, and organ damage. In clinical practice, these complexes are the primary target for iron chelation therapy in patients with chronic iron overload resulting from hereditary hemochromatosis or frequent blood transfusions. Drugs like deferoxamine and deferasirox mobilize iron from these tissue complexes to facilitate its excretion. Additionally, iron-containing complexes are significant in diagnostic imaging, where the paramagnetic properties of iron deposits are utilized in MRI to quantify iron loading in the liver and heart, guiding therapeutic interventions.

Other names

Tissue ironLabile iron poolIron storesFerritin-bound ironHemosiderinNon-heme iron

Iron chelators bind to ferric (Fe3+) or ferrous (Fe2+) ions within these complexes to form stable, non-toxic chelates that are excreted by the kidneys or liver, thereby reducing systemic and tissue-specific iron toxicity. Conversely, iron replacement therapies provide exogenous iron to replenish these complexes in cases of deficiency.