matriptase2

Matriptase2, also known as TMPRSS6, is a type II transmembrane serine protease. It is encoded by the TMPRSS6 gene in humans. Matriptase2 plays a critical role in iron metabolism by regulating the expression of hepcidin. Hepcidin is a key hormone that controls the absorption of iron from the diet and the release of iron from storage sites. Specifically, matriptase2 cleaves hemojuvelin, a transmembrane protein that is essential for hepcidin production. When matriptase2 is active, it degrades hemojuvelin, leading to reduced hepcidin levels. This reduction in hepcidin allows for increased iron absorption and release, thereby raising serum iron levels. Conversely, a deficiency in matriptase2 function results in elevated hepcidin, which then suppresses iron absorption and release, leading to iron deficiency anemia. Mutations in the TMPRSS6 gene are associated with certain forms of iron-refractory iron deficiency anemia (IRIDA). Research into matriptase2 continues to shed light on the complex mechanisms of iron homeostasis and its implications for various physiological and pathological conditions.