代谢
铁的新陈代谢过程是复杂的。正常情况下,铁以二价铁(Fe2+)或三价铁(Fe3+)的状态存在,但由于Fe2+会被氧化成Fe3+,在pH为中性的水溶液中,Fe3+会与水反应生成不溶性的铁(III)氢氧化物,因此铁会与血浆蛋白结合,并在体内被运输或储存。有三种蛋白质负责调节摄入铁的储存和运输。第一种蛋白质,转铁蛋白,负责在血浆和细胞外液中运输铁。血浆中的铜蓝蛋白和肠上皮细胞上的赫菲斯特蛋白参与铁的氧化和与转铁蛋白的结合。转铁蛋白的主要作用是将铁螯合,以防止产生反应性氧物种,同时促进铁进入细胞。
转铁蛋白受体位于许多需要铁的细胞上,它能结合转铁蛋白复合物并将其内化。铁蛋白是一种储存铁的蛋白质,使铁能够随时满足身体的需求。
The metabolism of iron is complex. Normally, iron exists in the ferrous (Fe2+) or ferric (Fe3+) state, but since Fe2+ is oxidized to Fe3+, which hydrolyzes to insoluble iron(III)hydroxides in neutral aqueous solutions, iron binds to plasma proteins and is either transported or stored throughout the body. There are three proteins that serve to regulate the storage and transport of ingested iron. The first protein , transferrin, transports iron in both the plasma and extracellular fluid. Ceruloplasmin in the plasma and hephaestin on the enterocyte participate in the oxidation and binding of iron to transferrin. The main role of transferrin is the chelation of iron to prevent the production of reactive oxygen species, while facilitating its transport into cells. The transferrin receptor, located on many cells that require iron, binds the transferrin complex and internalizes this complex. Ferritin is a protein that stores iron, making it readily available for body requirements.
来源:DrugBank