Ceruloplasmin Deficiency – Causes, Symptoms & Treatment
Ceruloplasmin deficiency is a rare inherited metabolic disorder in which the copper-containing protein ceruloplasmin is absent or non-functional, leading to toxic iron accumulation in vital organs.
Things worth knowing about "Ceruloplasmin deficiency"
Ceruloplasmin deficiency is a rare inherited metabolic disorder in which the copper-containing protein ceruloplasmin is absent or non-functional, leading to toxic iron accumulation in vital organs.
What is Ceruloplasmin Deficiency?
Ceruloplasmin deficiency, also known as aceruloplasminemia, is an extremely rare autosomal recessive metabolic disorder. It is characterized by the complete absence or severe reduction of ceruloplasmin, a copper-containing plasma protein that functions as a ferroxidase enzyme. This enzyme is essential for converting ferrous iron (Fe²) into ferric iron (Fe³), allowing iron to be safely transported through the bloodstream. Without ceruloplasmin, iron accumulates progressively in multiple organs, causing serious and irreversible damage.
Causes
The disorder is caused by loss-of-function mutations in the CP gene located on chromosome 3q. Inheritance follows an autosomal recessive pattern, meaning both copies of the gene must be mutated for the disease to manifest. Individuals who carry only one mutated copy (carriers) are typically unaffected.
- Point mutations, deletions, or insertions in the CP gene
- Autosomal recessive inheritance
- Complete loss of ferroxidase activity
Symptoms
Symptoms result from the progressive deposition of iron in the brain, liver, pancreas, and retina. Clinical manifestation typically occurs in adulthood, often after the age of 40, and includes:
- Neurological symptoms: involuntary movements (chorea, dystonia), cerebellar ataxia, and dementia
- Diabetes mellitus due to iron deposits in the pancreas
- Retinal degeneration leading to progressive visual impairment
- Hepatic involvement ranging from elevated liver enzymes to cirrhosis
- Anemia despite elevated iron storage levels
Diagnosis
Diagnosis is often delayed because the clinical presentation can mimic other neurodegenerative disorders. A combination of laboratory and imaging findings is required:
- Blood tests: absent or markedly reduced serum ceruloplasmin and low serum copper
- Serum ferritin: significantly elevated despite concurrent anemia
- Brain MRI: characteristic iron deposits in the basal ganglia, thalamus, and cerebellum
- Liver biopsy: confirmation of excessive hepatic iron storage
- Genetic testing: mutation analysis of the CP gene for definitive diagnosis
Treatment
There is currently no curative therapy. Treatment focuses on reducing iron burden and managing symptoms:
- Iron chelation therapy: agents such as deferoxamine or deferasirox bind excess iron and promote its excretion
- Fresh frozen plasma infusions: can transiently restore ceruloplasmin levels and ferroxidase activity
- Vitamin E supplementation: as an antioxidant, it may help reduce iron-mediated oxidative cell damage
- Symptomatic management: treatment of movement disorders, glycemic control for diabetes, and regular ophthalmological monitoring
Prognosis
Without treatment, organ damage progresses steadily. Early diagnosis and consistent iron chelation therapy can slow disease progression. Due to the rarity of this condition, referral to a specialized metabolic disease center is strongly recommended for optimal management.
References
- Kono S. - Aceruloplasminemia: An update. In: International Review of Neurobiology, 2013; 110: 125-151. PubMed PMID: 24209436.
- Miyajima H. - Aceruloplasminemia. In: Orphanet Journal of Rare Diseases, 2003; 1: 9. DOI: 10.1186/1750-1172-1-9.
- Vroegindeweij L.H.P. et al. - New insights in the neurological phenotype of aceruloplasminemia in Caucasian patients. In: Parkinsonism and Related Disorders, 2015; 21(7): 740-745. DOI: 10.1016/j.parkreldis.2015.04.008.
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