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Copper Deficiency and Toxicity
Most of the copper in the body is located in the liver, bones, and muscle, but traces of copper occur in all tissues of the body. The liver excretes excess copper into the bile for elimination from the body. Copper is a component of many enzymes, including ones that are necessary for the following:
Copper deficiency is rare among healthy people. It occurs most commonly among infants who are
Some male infants inherit a genetic abnormality that causes copper deficiency. This disorder is called Menkes syndrome.
In adults, copper deficiency may be caused by
Disorders that impair absorption of nutrients (such as celiac disease, Crohn disease, cystic fibrosis, or tropical sprue—see Overview of Malabsorption)
Weight-loss (bariatric) surgery
Consumption of too much zinc, which reduces the absorption of copper
Symptoms of copper deficiency include fatigue, anemia, and a decreased number of white blood cells. Sometimes, osteoporosis develops or nerves are damaged. Nerve damage can cause tingling and loss of sensation in the feet and hands. Muscles may feel weak. Some people become confused, irritable, and mildly depressed. Coordination is impaired.
Menkes syndrome causes severe intellectual disability, vomiting, and diarrhea. The skin lacks pigment, and the hair is sparse, steely, or kinky. Bones may be weak and malformed, and arteries are fragile, sometimes rupturing.
Consumption of excess copper is rare. People may consume small amounts of excess copper in acidic food or beverages that have been in copper vessels, tubing, or valves a long time. Consuming even relatively small amounts of copper may cause nausea, vomiting, and diarrhea. Large amounts, usually consumed by people intending to commit suicide, can damage the kidneys, inhibit urine production, and cause anemia due to the rupture of red blood cells (hemolytic anemia) and even death. Rarely, liver damage or cirrhosis occurs in children. It probably results from drinking milk that has been boiled or stored in corroded copper or brass vessels.
If large amounts of copper were consumed, the stomach is pumped.
If copper toxicity has caused problems such as anemia or has damaged the kidneys or liver, dimercaprol is injected into a muscle, or a drug that binds with copper, such as penicillamine, is given to remove excess copper. Children with liver damage are treated with penicillamine.
If used early, hemodialysis (a procedure that filters the blood) may be effective.
Occasionally, death occurs despite treatment.
In Wilson disease, a rare hereditary disorder, the liver does not excrete excess copper into the bile as it normally does, resulting in accumulation of copper in the liver and liver damage.
Copper accumulates in the liver, brain, eyes, and other organs.
People with Wilson disease may have tremors, difficulty speaking and swallowing, problems with coordination, personality changes, or hepatitis.
Blood tests and eye examinations help confirm the diagnosis.
People must take drugs to remove copper and must avoid foods high in copper for the rest of their life.
Because the liver does not excrete excess copper, copper accumulates in the liver and damages it, causing cirrhosis. The damaged liver releases copper directly into the blood, and copper is carried to other organs, such as the brain, kidneys, and eyes, where it also accumulates.
Symptoms usually begin between ages 5 and 35 but can begin anytime from age 2 to 72.
In almost half of affected people, the first symptoms result from brain damage. They include tremors, difficulty speaking and swallowing, drooling, incoordination, involuntary jerky movements (chorea), personality changes, and even psychosis (such as schizophrenia or manic-depressive illness). In most of the other people, the first symptoms result from liver damage, which causes hepatitis and eventually cirrhosis.
Gold or greenish gold rings (Kayser-Fleischer rings) may appear around the irises (the colored part of the eye). These rings develop when copper accumulates. In a few people, these rings are the first sign of Wilson disease.
People may have anemia because red blood cells rupture (causing hemolytic anemia). Women may have no menstrual periods or repeated miscarriages.
Doctors suspect Wilson disease based on symptoms, such as hepatitis, tremors, and personality changes that have no obvious other cause. The following tests help confirm the diagnosis:
If children have a family history of the disease, tests are done after about age 1 year. Tests done earlier are likely to miss the disease.
People with this disease must follow a diet that is low in copper. Foods to avoid include beef liver, cashews, black-eyed peas, vegetable juice, shellfish, mushrooms, and cocoa.
Drugs that bind with copper, such as penicillamine or trientine, taken by mouth, are used to remove the accumulated copper. Zinc supplements can prevent the body from absorbing copper and are used if penicillamine or trientine is ineffective or has too many side effects. Zinc should not be taken within 2 hours of taking penicillamine or trientine because it can bind to those drugs and make them ineffective. For the rest of their life, people with Wilson disease must take penicillamine, trientine, zinc, or a combination.
Without lifelong treatment, Wilson disease is fatal. With treatment, people usually fare well unless the disease was advanced when it was diagnosed.
People who do not take the drugs as directed, especially younger people, may develop liver failure.
Doctors recommend that people with this disease see an expert in liver disease on a regular basis.
Liver transplantation can cure the disease and may be lifesaving for people who have Wilson disease and severe liver failure or severe liver problems that do not respond to drug treatment.
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