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Hepcidin: Function, Significance and Disorders

Hepcidin is a liver-derived peptide hormone that acts as the master regulator of iron metabolism, controlling iron absorption and distribution throughout the body.

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Things worth knowing about "Hepcidin"

Hepcidin is a liver-derived peptide hormone that acts as the master regulator of iron metabolism, controlling iron absorption and distribution throughout the body.

What is Hepcidin?

Hepcidin is a small peptide hormone produced primarily by the liver. It is considered the master regulator of iron metabolism in the human body. The name is derived from the Latin words hepar (liver) and cidin (antimicrobial, inhibitory). Hepcidin was first identified in the early 2000s and has since become a central focus in hematology and internal medicine research.

Mechanism of Action

Hepcidin regulates iron transport by binding to the membrane protein ferroportin. Ferroportin is the only known iron export protein in mammalian cells and is found predominantly in:

Intestinal epithelial cells (enterocytes), where dietary iron is absorbed
Macrophages, which recycle iron from degraded red blood cells
Liver cells (hepatocytes), which store iron

When hepcidin binds to ferroportin, it triggers the internalization and degradation of ferroportin. This blocks iron export from these cells, reducing the availability of iron in the bloodstream.

Regulation of Hepcidin Production

Hepcidin production is controlled by several factors:

High blood iron levels stimulate hepcidin production to prevent iron overload.
Inflammation and infection increase hepcidin via the cytokine interleukin-6 (IL-6), depriving pathogens of iron.
Iron deficiency and anemia suppress hepcidin, allowing greater iron absorption.
Hypoxia (low oxygen levels) inhibits hepcidin to enhance iron supply for red blood cell production.
Erythropoietic activity (increased blood cell production) suppresses hepcidin to ensure adequate iron availability.

Clinical Significance

Anemia of Chronic Disease

In chronic inflammatory conditions such as rheumatoid arthritis, chronic kidney disease, or cancer, hepcidin levels are persistently elevated. This leads to anemia of chronic disease (ACD), in which iron cannot be mobilized for red blood cell production despite sufficient iron stores in the body.

Hereditary Hemochromatosis

In hereditary hemochromatosis, a genetic disorder, hepcidin production is insufficient or hepcidin signaling is impaired. As a result, excessive iron is absorbed from the gut, leading to dangerous iron accumulation in organs such as the liver, heart, and pancreas.

Iron Deficiency Anemia

In iron deficiency anemia, hepcidin levels are low, which promotes increased iron absorption from food and mobilization of iron stores. Measuring hepcidin can help differentiate between various forms of anemia.

Diagnostic Measurement

Hepcidin can be measured in blood serum or urine. The most common methods include mass spectrometry and ELISA assays. Hepcidin measurement is particularly useful for:

Differential diagnosis of various types of anemia
Monitoring therapy with erythropoietin or iron supplements
Diagnosing iron metabolism disorders such as hemochromatosis

Reference values vary depending on the laboratory and measurement method. Clinical decisions should always be made in the context of other iron metabolism parameters such as ferritin, transferrin, and CRP.

Therapeutic Approaches

Hepcidin represents a promising therapeutic target. Current research approaches include:

Hepcidin antagonists: Substances that inhibit hepcidin or protect ferroportin from degradation, intended for the treatment of anemia in chronic disease.
Hepcidin mimetics: Synthetic hepcidin-like molecules designed to treat iron overload disorders such as hemochromatosis.

References

Ganz T. - Hepcidin and iron regulation, 10 years later. Blood. 2011;117(17):4425-4433.
Camaschella C. - Iron-deficiency anemia. New England Journal of Medicine. 2015;372(19):1832-1843.
World Health Organization (WHO) - Nutritional anaemias: tools for effective prevention and control. Geneva: WHO, 2017.

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