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Ferritin is found in most tissues as a cytosolic protein, but small amounts are secreted into the serum where it functions as an iron carrier. Plasma ferritin is also an indirect marker of the total amount of iron stored in the body; hence, serum ferritin is used as a diagnostic test for iron-deficiency anemia and iron overload. [4]
Iron can be stored in ferritin as ferric iron due to the ferroxidase activity of the ferritin heavy chain. [28] Dysfunctional ferritin may accumulate as hemosiderin, which can be problematic in cases of iron overload. [29] The ferritin storage iron pool is much larger than the labile iron pool, ranging in concentration from 0.7 mM to 3.6 mM. [25]
Ferritin is an iron reservoir for an individual cell. It is found in all cells types and localized in the cytosol. Ferritin is a large protein composed of 24 subunits surrounding a core full of iron atoms. It is capable of holding 0-4500 iron atoms, [19] which can be used as a reservoir for cellular needs.
Mitochondrial ferritin is a ferroxidase enzyme that in humans is encoded by the FTMT gene. [5] It is classified as a metal-binding protein which is located within the mitochondria. After the protein is taken up by the mitochondria it can be processed into a mature protein and assemble functional ferritin shells.
Ferritin light chain is a protein that in humans is encoded by the FTL gene. [4] [5] [6] Ferritin is the major protein responsible for storing intracellular iron in prokaryotes and eukaryotes. It is a heteropolymer consisting of 24 subunits, heavy and light ferritin chains. [6] This gene has multiple pseudogenes. [6]
The same goes for vitamin B12 and ferritin (a form of iron) which women may not get enough of via food, particularly those following plant-based or vegetarian diets.
Low testosterone or testosterone deficiency, also known as hypogonadism, is a condition in which patients develop symptoms.
Hemosiderin or haemosiderin is an iron-storage complex that is composed of partially digested ferritin and lysosomes. The breakdown of heme gives rise to biliverdin and iron. [1] [2] The body then traps the released iron and stores it as hemosiderin in tissues. [3] Hemosiderin is also generated from the abnormal metabolic pathway of ferritin. [3]