{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T21:18:34Z","timestamp":1790803114383,"version":"4.1.0"},"reference-count":57,"publisher":"BMJ","issue":"4","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J Clin Pathol"],"accepted":{"date-parts":[[2010,11,15]]},"published-print":{"date-parts":[[2011,4]]},"abstract":"<jats:sec>\n                    <jats:title>Iron functions<\/jats:title>\n                    <jats:p>Iron is an essential micronutrient, as it is required for satisfactory erythropoietic function, oxidative metabolism and cellular immune response.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Iron physiology<\/jats:title>\n                    <jats:p>Absorption of dietary iron (1\u20132\u2005mg\/day) is tightly regulated and just balanced against iron loss because there are no active iron excretory mechanisms. Dietary iron is found in haem (10%) and non-haem (ionic, 90%) forms, and their absorption occurs at the apical surface of duodenal enterocytes via different mechanisms. Iron is exported by ferroportin 1 (the only putative iron exporter) across the basolateral membrane of the enterocyte into the circulation (absorbed iron), where it binds to transferrin and is transported to sites of use and storage. Transferrin-bound iron enters target cells\u2014mainly erythroid cells, but also immune and hepatic cells\u2014via receptor-mediated endocytosis. Senescent erythrocytes are phagocytosed by reticuloendothelial system macrophages, haem is metabolised by haem oxygenase, and the released iron is stored as ferritin. Iron will be later exported from macrophages to transferrin. This internal turnover of iron is essential to meet the requirements of erythropoiesis (20\u201330\u2005mg\/day). As transferrin becomes saturated in iron-overload states, excess iron is transported to the liver, the other main storage organ for iron, carrying the risk of free radical formation and tissue damage.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Regulation of iron homoeostasis<\/jats:title>\n                    <jats:p>Hepcidin, synthesised by hepatocytes in response to iron concentrations, inflammation, hypoxia and erythropoiesis, is the main iron-regulatory hormone. It binds ferroportin on enterocytes, macrophages and hepatocytes triggering its internalisation and lysosomal degradation. Inappropriate hepcidin secretion may lead to either iron deficiency or iron overload.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1136\/jcp.2010.079046","type":"journal-article","created":{"date-parts":[[2010,12,21]],"date-time":"2010-12-21T21:00:41Z","timestamp":1292965241000},"page":"281-286","source":"Crossref","is-referenced-by-count":168,"title":["Disorders of iron metabolism. 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