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Copper deficiency

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Copper deficiency

Copper deficiency
Classification and external resources
ICD-10 E61.0
ICD-9 275.1
OMIM 121270
DiseasesDB 3094

Copper deficiency is a very rare

  1. ^ Scheiber, Ivo; Dringen, Ralf; Mercer, Julian F. B. (2013). "Chapter 11. Copper: Effects of Deficiency and Overload". In Astrid Sigel, Helmut Sigel and Roland K. O. Sigel. Interrelations between Essential Metal Ions and Human Diseases. Metal Ions in Life Sciences 13. Springer. pp. 359–387.  
  2. ^ a b c d e f g h i j k l m n o p q r s t u v Jaiser, S. R., & Winston, G. P. (2010). Copper deficiency myelopathy. [Review]. Journal of Neurology, 257(6), 869-881.
  3. ^ a b c d e f g h Halfdanarson, T. R., Kumar, N., Li, C. Y., Phyliky, R. L., & Hogan, W. J. (2008). Hematological manifestations of copper deficiency: a retrospective review. [Article]. European Journal of Haematology, 80(6), 523-531.
  4. ^ a b c d e Kodama, H., & Fujisawa, C. (2009). Copper metabolism and inherited copper transport disorders: molecular mechanisms, screening, and treatment. Metallomics, 1(1), 42-52.
  5. ^ Copper Information: Benefits, Deficiencies, Food Sources. http://www.healthvitaminsguide.com/minerals/copper.htm
  6. ^ a b c d e f g h i j Klevay, L. M. (2006). "Myelodysplasia," myeloneuropathy, and copper deficiency. Mayo Clinic Proceedings, 81(1), 132-132.
  7. ^ a b c d e f g h i j k l m n o Kumar, N. (2006). Copper deficiency myelopathy (human swayback). Mayo Clinic Proceedings, 81(10), 1371-1384.
  8. ^ a b Fong T, Vij R, Vijayan A, DiPersio J, Blinder M. (2007). Copper deficiency: an important consideration in the differential diagnosis of myelodysplastic syndrome. Haematologica 92(10):1429-30.
  9. ^ a b c d e f g Jaiser, S. R., & Winston, G. P. (2008). Copper deficiency myelopathy and subacute combined degeneration of the cord: why is the phenotype so similar? Journal of Neurology, 255, P569.
  10. ^ Ataxic Gait Demonstration. Online Medical Video. http://www.youtube.com/watch?v=FpiEprzObIU&feature=related
  11. ^ a b Bolamperti, L., Leone, M. A., Stecco, A., Reggiani, M., Pirisi, M., Carriero, A., et al. (2009). Myeloneuropathy due to copper deficiency: clinical and MRI findings after copper supplementation. [Article]. Neurological Sciences, 30(6), 521-524.
  12. ^ a b c d e f Pineles, S. L., Wilson, C. A., Balcer, L. J., Slater, R., & Galetta, S. L. (2010). Combined Optic Neuropathy and Myelopathy Secondary to Copper Deficiency. [Review]. Survey of Ophthalmology, 55(4), 386-392.
  13. ^ a b Jaiser, Stephan R. and Duddy, R. Copper Deficiency Masquerading as Subacute Combined Degeneration of the Cord and Myelodysplastic Syndrome. Advances in clinical neuroscience and rehabilitation, http://www.acnr.co.uk/JA07/ACNR_JA07_abnwinner.pdf
  14. ^ a b c Spinazzi, M., De Lazzari, F., Tavolato, B., Angelini, C., Manara, R., Armani, M. (2007). Myelo-optico-neuropathy in copper deficiency occurring after partial gastrectomy. Do small bowel bacterial overgrowth syndrome and occult zinc ingestion tip the balance? Journal of Neurololgy,254, 1012-1017.
  15. ^ a b Hedera, P., Peltier, A., Fink, J. K., Wilcock, S., London, Z., & Brewer, G. J. (2009). Myelopolyneuropathy and pancytopenia due to copper deficiency and high zinc levels of unknown origin II. The denture cream is a primary source of excessive zinc. [Article]. Neurotoxicology (Amsterdam), 30(6), 996-999.
  16. ^ a b Dhawan, S. S., Ryder, K. M., & Pritchard, E. (2008). Massive penny ingestion: The loot with local and systemic effects. [Article]. Journal of Emergency Medicine, 35(1), 33-37.
  17. ^ a b c Kaler, S. G., Liew, C. J., Donsante, A., Hicks, J. D., Sato, S., & Greenfield, J. C. (2010). Molecular correlates of epilepsy in early diagnosed and treated Menkes disease. Journal of Inherited Metabolic Disease, 33(5), 583-589.
  18. ^ Vest, Katherine E.; Hashemi, Hayaa F.; Cobine, Paul A. (2013). "Chapter 13 The Copper Metallome in Eukaryotic Cells". In Banci, Lucia (Ed.). Metallomics and the Cell. Metal Ions in Life Sciences 12. Springer.   electronic-book ISBN 978-94-007-5561-1 ISSN 1559-0836 electronic-ISSN 1868-0402

References

See also

Copper deficiency is a very rare disease and is often misdiagnosed several times by physicians before concluding the deficiency of copper through differential diagnosis (copper serum test and bone marrow biopsy are usually conclusive in diagnosing copper deficiency). On average, patients are diagnosed with copper deficiency around 1.1 years after their first symptoms are reported to a physician.[2] Copper deficiency can be treated with either oral copper supplementation or intravenous copper.[7] If zinc intoxication is present, discontinuation of zinc may be sufficient to restore copper levels back to normal, but this usually is a very slow process.[7] People who suffer from zinc intoxication will usually have to take copper supplements in addition to ceasing zinc consumption. Hematological manifestations are often quickly restored back to normal.[7] The progression of the neurological symptoms will be stopped by appropriate treatment, but often with residual neurological disability.

Treatment

Zinc intoxication may cause anemia by blocking the absorption of copper from the stomach and duodenum.[2] Zinc also upregulates the expression of chelator metallothionein in enterocytes, which are the majority of cells in the intestinal epithelium.[2] Since copper has a higher affinity for metallothionein than zinc, the copper will remain bound inside the enterocyte, which will be later eliminated through the lumen.[2] This mechanism is exploited therapeutically to achieve negative balance in Wilson’s disease, which involves an excess of copper.[2]

Zinc Intoxication

The cause of neutropenia is still unclear; however, the arrest of maturing myelocytes, or neutrophil precursors, may cause the neutrophil deficiency.[6][3]

Cell Growth Halt

The anemia caused by copper deficiency is thought to be caused by impaired iron transport. Hephaestin is a copper containing ferroxidase enzyme located in the duodenal muscosa that oxidizes iron and facilitate its transfer across the basolateral membrane into circulation.[6] Another iron transporting enzyme is ceruloplasmin.[6] This enzyme is required to mobilize iron from the reticuloendothelial cell to plasma.[6] Ceruloplasmin also oxidizes iron from its ferrous state to the ferric form that is required for iron binding.[4] Impairment in these copper dependent enzymes that transport iron may cause the secondary iron deficiency anemia.[6] Another speculation for the cause of anemia is involving the mitochondrial enzyme cytochrome c oxidase (complex IV in the electron transport chain). Studies have shown that animal models with impaired cytochrome c oxidase failed to synthesize heme from ferric iron at the normal rate.[6] The lower rate of the enzyme might also cause the excess iron to clump, giving the heme an unusual pattern.[6] This unusual pattern is also known as ringed sideroblastic anemia cells.

Iron Transportation

Hematological Etiology

Another hypothesis is that copper deficiency myelopathy is caused by disruptions in the methylation cycle.[9] The methylation cycle causes a transfer of a methyl group (-CH3) from methyltetrahydrofolate to a range of macromolecules by the suspected copper dependent enzyme methionine synthase.[9] This cycle is able to produce purines, which are a component of DNA nucleotide bases, and also myelin proteins.[9] The spinal cord is surrounded by a layer of protective protein coating called myelin (see figure). When this methionine synthase enzyme is disrupted, the methylation decreases and myelination of the spinal cord is impaired. This cycle ultimately causes myelopathy.[9]

Myelinated neuron

Methylation Cycle

There have been several hypotheses about the role of copper and some of its neurological manifestations. Some suggest that disruptions in cytochrome c oxidase, also known as Complex IV, of the electron transport chain is responsible for the spinal cord degeneration.[2][9]

Cytochrome c Oxidase

Cytochrome c Oxidase mechanism in mitochondrial membrane

Neurological Etiology

Several Copper Dependent Enzymes and Their Function[2]
Group Enzyme Function
Oxidases Flavin-containing amine oxidase Metabolism of neurotransmitters: noradrenaline, dopamine, serotonin and some dietary amines
Protein-lysine-6-oxidase (lysyl oxidase) Connective tissue synthesis- cross-linking of collagen and elastin
Copper-containing amine oxidase Metabolism of amines- histamines, putrescine, cadaverine
Cytochrome c oxidase Oxidative phosphorylation, electron transport in the mitochondrial membrane
Superoxide dismutase (Cu/Zn dismutase) Antioxidant and free radical scavenger, oxidizes dangerous superoxides to safer hydrogen peroxide
Ferroxidase I (ceruloplasmin) Iron transport-oxidation of Fe2+ to Fe 3+, copper storage and transport, antioxidant and free radical neutralizer
Hephaestin (ferroxidase) Iron transport and oxidation of Fe2+ to Fe3+ in intestinal cells to enable iron uptake
Monooxygenases Dopamine beta-monooxygenase Conversion of dopamine to norepinephrine
Peptidylglycine monooxygenase Peptide hormone maturation- amidation of alpha-terminal carboxylic acid group of glycine
Monophenol monooxygenase (Tyrosinase) Melanin synthesis
Methylation Cycle Methionine synthase Transfer of methyl group from methyltetrahydrofolate to homocysteine to generate methionine for the methylation cycle and tetrahydrofolate for purine synthesis
Adenosylhomocysteinase (S-Adenosyl-L-homocysteine) Regeneration of homocysteine from adenosylhomocyesteine (S-Adenosyl-L-homocysteine) in the methylation cycle

Copper functions as a prosthetic group, which permits electron transfers in key enzymatic pathways like the electron transport chain.[18][3][2] Copper is integrated in the enzymes cytochrome c oxidase, which is involved in cellular respiration and oxidative phosphorylation, Cu/Zn dismutase, which is involved in antioxidant defense, and many more listed in the table below.[3]

Biochemical Etiology

It is rarely suggested that excess iron supplementation causes copper deficiency myelopathy.[2] Another rarer cause of copper deficiency is celiac disease, probably due to malabsorption in the intestines.[2] Still, a large percentage, around 20%, of cases have unknown causes.[2]

Other

Menkes disease is a congenital disease that is a cause of copper deficiency.[4][7][17] Menkes disease is a hereditary condition caused by a defective gene involved with the metabolism of copper in the body.[7] Menkes disease involves a wide variety of symptoms including floppy muscle tone, seizures, abnormally low temperatures, and a peculiar steel color hair that feels very rough.[4][17] Menkes disease is usually a fatal disease with most children dying within the first ten years of life.[4][17]

Menkes disease showing symptoms of the sparse, steel colored "kinky hair" and paleness

Hereditary Disorders

Metallic zinc is the core of all United States currency coins, including copper coated pennies. People who ingest massive amount of coins will have elevated zinc levels, leading to zinc toxicity induced copper deficiency and thus displaying neurological symptoms. This was the case for a 57 year old man diagnosed with schizophrenia.[16] This woman consumed over 600 coins, and started to show neurological symptoms such as unsteady gait and mild ataxia.[16]

Increased consumption of zinc is another cause of copper deficiency.[7] Zinc is often used for the prevention or treatment of common colds and sinusitis (inflammation of sinuses due to an infection), ulcers, sickle cell disease, celiac disease, memory impairment and acne.[7] Zinc is found in many common vitamin supplements and is also found in denture creams.[7][14][15] Recently, several cases of copper deficiency myeloneuropathy were found to be caused by prolonged use of denture creams containing high quantities of zinc.[14][15]

Zinc Toxicity

Bariatric surgery is a common cause of copper deficiency.[6][2] Bariatric surgery, such as gastric bypass surgery, is often used for weight control of the morbidly obese. The disruption of the intestines and stomach from the surgery can cause absorption difficulties not only as regards copper, but also for iron and vitamin B12 and many other nutrients.[2] The symptoms of copper deficiency myelopathy may take a long time to develop, sometimes decades before the myelopathy symptoms manifest.

Surgery

Causes

Some patients suffering from copper deficiency have shown signs of vision and color loss.[12] The vision is usually lost in the peripheral views of the eye.[12] The bilateral vision loss is usually very gradual.[14][12] An optical coherence tomography (OCT) shows some nerve fiber layer loss in most patients, suggesting the vision loss and color vision loss was secondary to optic neuropathy or neurodegeneration.[12]

Optic Neuropathy

Another common symptom of copper deficiency is peripheral neuropathy, which is numbness or tingling that can start in the extremities and can sometimes progress radially inward towards the torso.[7][12] In an Advances in Clinical Neuroscience & Rehabilitation (ACNR) published case report, a 69 year old patient had progressively worsened neurological symptoms.[13] These symptoms included diminished upper limb reflexes with abnormal lower limb reflexes, sensation to light touch and pin prick was diminished above the waist, vibration sensation was lost in the sternum, and markedly reduced proprioception or sensation about the self’s orientation.[13] Many people suffering from the neurological effects of copper deficiency complain about very similar or identical symptoms as the patient.[2][12] This numbness and tingling poses danger for the elderly because it increases their risk of falling and injuring themselves. Peripheral neuropathy can become very disabling leaving some patients dependent on wheel chairs or walking canes for mobility if there is lack of correct diagnosis. Rarely can copper deficiency cause major disabling symptoms. The deficiency will have to be present for an extensive amount of time until such disabling conditions manifest.

Peripheral Neuropathy

In brain MRI, there is often an increased T2 signalling at the posterior columns of the spinal cord in patients with myelopathy caused by copper deficiency.[2][7][11] T2 signalling is often an indicator of some kind of neurodegeneration. There are some changes in the spinal cord MRI involving the thoracic cord, the cervical cord or sometimes both.[2][7] Copper deficiency myelopathy is often compared to subacute combined degeneration (SCD).[9] Subacute combined degeneration is also a degeneration of the spinal cord, but instead vitamin B12 deficiency is the cause of the spinal degeneration.[2] SCD also has the same high T2 signalling intensities in the posterior column as copper deficient patient in MRI imaging.[11]

Copper deficiency myelopathy in humans was discovered and first described by Schleper and Stuerenburg in 2001. (Schleper B, Stuerenburg HJ. Copper deficiency-associated myelopathy in a 46-year-old woman. J Neurol. 2001 Aug; 248 (8): 705 - 6). They described a patient with a history of gastrectomy and partial colonic resection who presented with severe tetraparesis and painful paraesthesias and who was found on imaging to have dorsomedial cervical cord T2 hyperintensity. Upon further analysis, it was found that the patient had decreased levels of serum coeruloplasmin, serum copper, and CSF copper. The patient was treated with parenteral copper and the patient`s paraesthesias did resolve. Since this discovery, there has been heightened and increasing awareness of copper-deficiency myelopathy and its treatment, and this disorder has been reviewed by Kumar. Sufferers typically present difficulty walking (gait difficulty) caused by sensory ataxia (irregular muscle coordination) due to dorsal column dysfunction[7] or degeneration of the spinal cord (myelopathy).[2][9] Patients with ataxic gait have problems balancing and display an unstable wide walk. They often feel tremors in their torso, causing side way jerks and lunges.[10]

Myelopathy

Copper deficiency can cause a wide variety of neurological problems including, myelopathy, peripheral neuropathy, and optic neuropathy.[2][7]

Neurological Presentation

Anemia and neutropenia typically resolve within six weeks of copper replacement.[8]

The peripheral blood and bone marrow aspirate findings in copper deficiency can mimic myelodysplastic syndrome.[8] Bone marrow aspirate in both conditions may show dysplasia of blood cell precursors and the presence of ring sideroblasts (erythoblasts containing multiple iron granules around the nucleus). Unlike most cases of myelodysplastic syndrome, the bone marrow aspirate in copper deficiency characteristically shows cytoplasmic vacuoles within red and white cell precursors, and karyotyping in cases of copper deficiency does not reveal cytogenetic features characteristic of myelodysplastic syndrome.[6][7]

The characteristic hematological (blood) effects of copper deficiency are anemia (which may be microcytic, normocytic or macrocytic) and neutropenia.[6] Thrombocytopenia (low blood platelets) is unusual.[3][7]

Ring Sideroblast smear 2010-01-13

Hematological Presentation

Symptoms

Contents

  • Symptoms 1
    • Hematological Presentation 1.1
    • Neurological Presentation 1.2
      • Myelopathy 1.2.1
      • Peripheral Neuropathy 1.2.2
      • Optic Neuropathy 1.2.3
  • Causes 2
    • Surgery 2.1
    • Zinc Toxicity 2.2
    • Hereditary Disorders 2.3
    • Other 2.4
  • Biochemical Etiology 3
    • Neurological Etiology 3.1
      • Cytochrome c Oxidase 3.1.1
      • Methylation Cycle 3.1.2
    • Hematological Etiology 3.2
      • Iron Transportation 3.2.1
      • Cell Growth Halt 3.2.2
      • Zinc Intoxication 3.2.3
  • Treatment 4
  • See also 5
  • References 6

(disease of the spinal cord), and rarely optic neuropathy. myelopathy (damage in the peripheral nerves), peripheral neuropathy (irregular coordination due to proprioceptive loss), spasticity, muscle weakness, and more rarely visual loss due to sensory ataxia development), but it was not until recently in 2001 that copper deficiency was associated with neurological manifestations. Some neurological manifestations can be leukemia (when a blood profile has indicators of possible future myelodysplasia Copper deficiency has long been known for as a cause of [3], a type of white blood cell that is often called "the first line of defense" for the immune system).neutrophils (low count of neutropenia (low white blood cell count) and leukopenia, anemia, myelodysplasia The deficiency in copper can cause many hematological manifestations, such as [5]

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