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Iron-Binding Protein – Function and Clinical Relevance

Iron-binding proteins are proteins that transport and store iron in the body. They regulate iron metabolism and protect cells from iron-related damage.

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Things worth knowing about "Iron-Binding Protein"

Iron-binding proteins are proteins that transport and store iron in the body. They regulate iron metabolism and protect cells from iron-related damage.

What Are Iron-Binding Proteins?

Iron-binding proteins are a class of proteins capable of binding, transporting, or storing iron ions. Because free iron is toxic to the body – it promotes the formation of harmful free radicals through the Fenton reaction – its controlled binding to specific proteins is essential for cellular protection and normal physiological function. Iron-binding proteins are central to the body´s iron metabolism.

Key Iron-Binding Proteins

Transferrin

Transferrin is the primary iron transport protein in blood plasma. It binds two ferric iron ions (Fe³⁺) and delivers them to target cells, especially red blood cell precursors in the bone marrow. The transferrin saturation level is an important laboratory value for assessing iron status.

Ferritin

Ferritin is the main iron storage protein in the body. Found primarily in the liver, spleen, and bone marrow, it can store up to 4,500 iron ions within its protein shell. Serum ferritin levels serve as a marker of the body's iron stores and are used to diagnose iron deficiency or iron overload.

Hemoglobin and Myoglobin

Hemoglobin in red blood cells and myoglobin in muscle tissue are functional iron-binding proteins that hold iron within their heme group. They are indispensable for oxygen transport and oxygen storage in the body.

Lactoferrin

Lactoferrin is an iron-binding protein found mainly in body fluids such as breast milk, saliva, and tears. It exerts antimicrobial effects by sequestering free iron that bacteria require for growth, making it an important component of innate immunity.

Hepcidin and Its Role

Hepcidin is a peptide hormone considered the master regulator of iron metabolism. It controls the activity of ferroportin, a transmembrane protein that exports iron from cells into the bloodstream. When iron levels are high, hepcidin inhibits ferroportin, thereby reducing iron availability throughout the body.

Clinical Relevance

Disruptions in the function or concentration of iron-binding proteins can lead to various medical conditions:

Iron deficiency anemia: Characterized by low ferritin and elevated transferrin levels, indicating depleted iron stores.
Hemochromatosis: A genetic disorder causing excessive iron accumulation, often associated with high transferrin saturation and elevated ferritin.
Anemia of chronic disease: Elevated hepcidin blocks iron release from stores, causing functional iron deficiency even when sufficient iron is stored.
Infection defense: Lactoferrin and other iron-binding proteins play a significant role in the innate immune response against pathogens.

Diagnosis

Several laboratory parameters are used to assess iron metabolism:

Serum ferritin: Reflects the body's iron stores.
Transferrin and transferrin saturation: Provide information about iron transport in the blood.
Serum iron: Measures iron circulating directly in the blood.
Soluble transferrin receptor (sTfR): Elevated in iron deficiency; useful for differentiating between types of anemia.

References

Ganz T. - Systemic iron homeostasis. Physiological Reviews, 2013; 93(4): 1721-1741. PubMed.
World Health Organization (WHO) - Haemoglobin concentrations for the diagnosis of anaemia and assessment of severity. WHO/NMH/NHD/MNM/11.1, 2011.
Andrews N.C. - Disorders of iron metabolism. New England Journal of Medicine, 1999; 341(26): 1986-1995.

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