Which condition most strongly increases hepcidin levels?

Which condition most strongly increases hepcidin levels?

• A. Iron deficiency
• B. Hypoxia
• C. Iron overload
• D. Inflammation

Answer: (D)

Hepcidin is the master regulator that tells the body how much iron can be released into the bloodstream. It acts by binding to ferroportin, the iron-exporter on gut enterocytes and macrophages, causing ferroportin’s degradation and thereby lowering iron entry into plasma. Inflammation strongly increases hepcidin through inflammatory cytokines, especially interleukin-6, which activates the JAK-STAT pathway in liver cells to boost hepcidin production. This response traps iron inside storage sites and reduces its availability in the blood, a hallmark of the anemia of inflammation. In contrast, iron deficiency and hypoxia push hepcidin downward to promote iron absorption and mobilization for erythropoiesis. Iron overload can raise hepcidin to limit further iron uptake, but the inflammatory signal is the most potent and widely observed driver of increased hepcidin.

Hepcidin is the master regulator that tells the body how much iron can be released into the bloodstream. It acts by binding to ferroportin, the iron-exporter on gut enterocytes and macrophages, causing ferroportin’s degradation and thereby lowering iron entry into plasma.

Inflammation strongly increases hepcidin through inflammatory cytokines, especially interleukin-6, which activates the JAK-STAT pathway in liver cells to boost hepcidin production. This response traps iron inside storage sites and reduces its availability in the blood, a hallmark of the anemia of inflammation. In contrast, iron deficiency and hypoxia push hepcidin downward to promote iron absorption and mobilization for erythropoiesis. Iron overload can raise hepcidin to limit further iron uptake, but the inflammatory signal is the most potent and widely observed driver of increased hepcidin.