Physiological iron-binding proteins and reticuloendothelial system cells

This entry refers to the integrated physiological system responsible for the transport, storage, and recycling of iron within the human body. It primarily involves iron-binding proteins such as transferrin, which facilitates systemic transport, and ferritin, which serves as the primary intracellular storage vessel (Ganz, T., 2012, Journal of Innate Immunity). The reticuloendothelial system (RES), or mononuclear phagocyte system, consists of specialized macrophages in the spleen, liver, and bone marrow that recycle iron from senescent red blood cells (Abbaspour, N., et al., 2014, Journal of Research in Medical Sciences). In clinical pharmacology, this system is the primary site of action for intravenous iron supplements, such as iron sucrose, which are designed to be captured and processed by RES macrophages (FDA Label: Venofer). Once internalized, these drugs release iron into the intracellular pool to be either stored or exported to transferrin for delivery to the bone marrow for erythropoiesis (StatPearls: Physiology, Iron). Proper functioning of this system is essential for maintaining iron homeostasis and preventing oxidative stress. Pathological states involving this system include iron deficiency anemia, where stores are depleted, and hemochromatosis, where iron accumulates to toxic levels.

Other names

Iron metabolism systemMononuclear phagocyte system iron storesIron transport and storage compartmentRES iron recycling pathway

Intravenous iron complexes are phagocytosed by macrophages of the reticuloendothelial system, where the iron is released from the carbohydrate shell into the intracellular iron pool to be stored as ferritin or exported via ferroportin to transferrin for systemic transport to the bone marrow.