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Journal Article
Review
Macrophages and Iron Metabolism.
Microbiology Spectrum 2016 October
Macrophages exert multiple important roles in iron metabolism. As scavengers, splenic and hepatic macrophages phagocytize and degrade senescent and damaged erythrocytes to recycle iron, predominantly for the production of hemoglobin in new erythrocytes. Splenic red pulp macrophages are specialized for iron recycling, with increased expression of proteins for the uptake of hemoglobin, breakdown of heme, and export of iron. Iron release from macrophages is closely regulated by the interaction of hepcidin, a peptide hormone produced by hepatocytes, with the macrophage iron exporter ferroportin. As regulators and effectors of antimicrobial host defense, macrophages employ multiple mechanisms to contain microbial infections by depriving microbes of iron. Macrophages also have an important trophic role in the bone marrow, supporting efficient erythropoiesis.
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