Ceruloplasmin – Function, Lab Values & Diseases
Ceruloplasmin is a copper-binding protein found in the blood that plays a key role in copper and iron metabolism. It is an important laboratory marker for diagnosing copper metabolism disorders.
Things worth knowing about "Ceruloplasmin"
Ceruloplasmin is a copper-binding protein found in the blood that plays a key role in copper and iron metabolism. It is an important laboratory marker for diagnosing copper metabolism disorders.
What is Ceruloplasmin?
Ceruloplasmin is a glycoprotein produced by the liver and found in blood plasma. It belongs to the group of copper-containing proteins and carries approximately 90 to 95 percent of all copper present in the bloodstream. Its name is derived from the Latin word caeruleus (blue), reflecting the characteristic blue color the protein exhibits due to its copper content.
In addition to transporting copper, ceruloplasmin has important ferroxidase activity: it oxidizes ferrous iron (Fe²⁺) into ferric iron (Fe³⁺), which is essential for the proper transport and storage of iron in the body. This makes ceruloplasmin a key link between copper and iron metabolism.
Biological Functions
- Copper transport: Ceruloplasmin binds copper ions and delivers them to target tissues throughout the body.
- Iron metabolism: Through its ferroxidase activity, it enables the loading of transferrin with iron, supporting iron transport in the blood.
- Antioxidant activity: Ceruloplasmin neutralizes free radicals and helps protect cells from oxidative damage.
- Acute-phase protein: During inflammation, infection, or tissue injury, ceruloplasmin levels rise, as it is classified as a positive acute-phase reactant.
Ceruloplasmin as a Laboratory Marker
Ceruloplasmin levels are measured through a standard blood draw. The normal range in adults is generally between 20 and 60 mg/dL, though reference values may vary slightly between laboratories.
Low Ceruloplasmin Levels
A reduced ceruloplasmin level may indicate the following conditions:
- Wilson disease: A genetically inherited disorder of copper metabolism in which copper accumulates excessively in the liver, brain, and other organs. Ceruloplasmin is typically markedly reduced in this condition.
- Copper deficiency: Resulting from insufficient dietary intake or impaired absorption of copper.
- Aceruloplasminemia: A rare genetic disorder in which no functional ceruloplasmin is produced.
- Severe liver disease: Since ceruloplasmin is synthesized in the liver, cirrhosis or liver failure can significantly reduce its levels.
- Malnutrition and malabsorption: For example, in Menkes syndrome or severe protein deficiency.
High Ceruloplasmin Levels
Elevated ceruloplasmin levels are commonly found in:
- Acute and chronic inflammatory conditions
- Infections
- Pregnancy and use of estrogen-containing medications (e.g., hormonal contraceptives)
- Certain cancers (e.g., lymphomas, leukemias)
- Rheumatoid arthritis and other autoimmune diseases
Clinical Significance and Diagnosis
Measurement of ceruloplasmin is particularly important in the diagnosis of Wilson disease. A complete diagnostic workup includes not only ceruloplasmin but also total serum copper, free (non-ceruloplasmin-bound) copper, and 24-hour urinary copper excretion. An ophthalmologic examination for Kayser-Fleischer rings – characteristic copper deposits in the cornea of the eye – and liver biopsy may also be used to confirm the diagnosis.
Since ceruloplasmin is also an inflammatory marker, elevated values should always be interpreted in the context of other laboratory parameters (e.g., CRP, complete blood count).
Reference Values at a Glance
- Adults: 20–60 mg/dL
- Newborns: Values are physiologically low and rise during the first year of life
- Pregnant individuals: Elevated values due to estrogen-stimulated ceruloplasmin synthesis
References
- Linder, M.C. – Ceruloplasmin and other copper binding components of blood plasma and their functions: an update. Metallomics, 2016; 8(9): 887–905. DOI: 10.1039/c6mt00103c
- European Association for Study of the Liver (EASL) – EASL Clinical Practice Guidelines: Wilson's disease. Journal of Hepatology, 2012; 56(3): 671–685.
- Pfeiffer, R.F. – Wilson's disease. Seminars in Neurology, 2007; 27(2): 123–132. DOI: 10.1055/s-2007-971173
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