Abstract
The liver is a complex and critically important organ involved in both the biosynthesis of as well as the metabolism of numerous biochemical products. Acquired metabolic liver disorders result from the loss of this hepatic homeostasis. It is thought that the first recognition of a metabolic liver disorder was the description of porphyria by Hippocrates. The focus of this chapter is the potential origins for, diagnosis of, and treatment of acquired metabolic liver disorders, which include ornithine transcarbamylase deficiency, porphyria, hemochromatosis, and alpha 1 antitrypsin deficiency. Origins for acquired metabolic liver disorders include bariatric surgery with regards to ornithine transcarbamylase deficiency, organic chemical exposure with regards to porphyria, alcohol use/repeated blood transfusions/excessive oral iron supplements/hepatitis C with regards to hemochromatosis, and infectious Tropical Pulmonary Eosinophilia with regards to alpha 1 antitrypsin deficiency. Wilson disease is an additional, important genetic metabolic liver disease. In future work, pathophysiological mechanisms of disease and preventing the development of acquired metabolic liver disorders remain areas of focus for clinical research in this field.
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References
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Further Readings
Ornithine Transcarbamylase Deficiency
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Levy H, Picker J. New England Consortium of Metabolic Programs. Ornithine transcarbamylase deficiency (OTC deficiency).
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Porphyria
Downey DC. Porphyria and chemicals. Med Hypotheses. 1999;53(2):166–71.
Jarrell JF, Gocmen A, Akyol D, Brant R. Hexachlorobenzene exposure and the proportion of male births in Turkey 1935-1990. Reprod Toxicol. 2002;16(1):65–70.
Hemochromatosis
Moyer TP, Highsmith WE, Smyrk TC, Gross JB Jr. Hereditary hemochromatosis: laboratory evaluation. Clin Chim Acta. 2011;412(17, 18):1485–92.
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Phlebotomy Guidelines: http://www.irondisorders.org/Websites/idi/files/Content/854256/Physician%20Chart%20phlebotomy%20detail2011.pdf
Alpha 1 Antitrypsin Deficiency
Ray D, Harikrishna S, Immanuel C, Victor L, Subramanyam S, Kumaraswami V. Acquired alpha 1-antitrypsin deficiency in tropical pulmonary eosinophilia. Indian J Med Res. 2011;134:79–82.
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Self Study
Self Study
1.1 Questions
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1.
Which statements are true?
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(a)
Ornithine Transcarbamylase deficiency is the most common urea cycle disorder.
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(b)
Hyperammonemia causes symptoms of peripheral neuropathy beginning with paresthesias of the extremities, progressing to numbness, and then to a constant burning sensation.
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(c)
Patients with Ornithine Transcarbamylase deficiency present with a decreased urine orotic acid.
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(d)
Initial treatment of ornithine transcarbamylase deficiency involves a reduction in the production of nitrogenous waste as well as increased excretion of nitrogenous waste.
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(a)
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2.
Which statement is true?
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(a)
Porphyrias result from a urea cycle disorder.
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(b)
The development of blistering and thinning of areas of sun-exposed skin can result from exposure to a mixture of two phenoxy herbicides: 2,4-dichlorophenoxyacetic acid and 2,4,5-trichlorophenoxyacetic acid.
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(c)
The avoidance of alcohol does not prevent development of porphyria cutanea tarda.
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(d)
Individuals receiving chloroquine or hydroxychloroquine should undergo periodic examination of renal or kidney function.
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(a)
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3.
Which statement is true?
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(a)
Hereditary hemochromatosis is an autosomal dominant disorder that involves the HFE gene.
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(b)
Symptoms/findings of hemochromatosis include liver enlargement, cirrhosis, “bronze” skin color, diabetes mellitus, arthropathy, cardiomyopathy, or hypogonadism.
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(c)
In individuals without HFE gene mutations, computerized tomography imaging of the liver is generally useful for supporting a diagnosis of hemochromatosis.
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(d)
Phlebotomy is the initial treatment for hereditary hemochromatosis and the pretreatment hemoglobin should be >10 g/dl with a serum ferritin of <50 ng/ml.
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(a)
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4.
Which statements are true?
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(a)
Alpha 1 antitrypsin is a protease inhibitor mainly biosynthesized by hepatocytes that protects tissues from proteolytic enzyme damage.
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(b)
Upon genetic testing for alpha 1 antitrypsin, three alleles have been described, M, S, and Z.
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(c)
There have been sporadic reports of acquired alpha 1 antitrypsin deficiency, especially in individuals with Tropical Pulmonary Eosinophilia and the homozygote ZZ alleles.
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(d)
Alpha 1 antitrypsin deficiency-related liver disease is treated with augmentation therapy using alpha 1 antitrypsin protein purified from plasma of healthy humans.
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(a)
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5.
What is the most effective initial treatment for Wilson Disease?
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(a)
Low copper diet.
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(b)
Oral zinc supplements.
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(c)
Decoppering with penicillamine
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(d)
Decoppering with trientine
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(a)
1.2 Answers
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1.
Which statements are true?
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(a) Ornithine Transcarbamylase deficiency is the most common urea cycle disorder with a prevalence of 1:14,000–70,000.
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(b) Untreated hyperammonemia will manifest as neurological symptoms that may range from mild cognitive and psychomotor changes, to altered level of consciousness and coma.
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(c) Patients with Ornithine Transcarbamylase deficiency present with an increased urine orotic acid.
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(d) Ornithine transcarbamylase deficiency must be considered early in individuals with suspected hepatic encephalopathy because rapid reduction in the production of nitrogenous waste and increased excretion of nitrogenous waste are required to prevent neurological damage.
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2.
Which statement is true?
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(a) Porphyrias are the result of defective enzymatic activity in the heme biosynthetic pathway in erythroid and nonerythroid tissues.
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(b) The classic acquired porphyria is the development of porphyria cutanea tarda (Type 1) following exposure to Agent Orange (two phenoxy herbicides: 2,4-dichlorophenoxyacetic acid and 2,4,5-trichlorophenoxyacetic acid containing a trace of a toxic dioxin). Clinical features of this disorder include the development of blistering and thinning of areas of sun-exposed skin.
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(c) The initial treatment of porphyria cutanea tarda is prevention, e.g. the avoidance of alcohol and avoiding exposure to estrogen.
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(d) Medical Providers should consider obtaining periodic retinal examinations in those individuals receiving chloroquine or hydroxychloroquine. The protective effect of hydroxychloroquine in retarding renal damage occurrence in individuals with autoimmune disorders has been reported.
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3.
Which statement is true?
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(a) Hereditary hemochromatosis is an autosomal recessive disorder that involves the HFE gene, and causes abnormal iron storage as the result of association of HFE protein with the transferrin receptor in the duodenum.
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(b) The classic description of an individual with hereditary hemochromatosis is presentation with liver enlargement or cirrhosis in combination with “bronze” skin color and diabetes mellitus. Individuals can present with symptoms/findings of arthropathy, cardiomyopathy, or hypogonadism, or they can simply present with cirrhosis.
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(c) In the 15% of individuals without the HFE gene mutations, patients can be sent for magnetic resonance imaging of the liver or proceed to the historical “gold standard” for diagnosis, which is performance of a liver biopsy with iron quantification.
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(d) Phlebotomy is the initial effective treatment for hereditary hemochromatosis and, if begun early in the course of this metabolic disease, can prevent the development of cirrhosis. The pretreatment hemoglobin should be >12 g/dl. Phlebotomy to remove 500 ml of whole blood once weekly is performed to produce a transferrin saturation of <50% or a serum ferritin of <50 ng/ml.
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4.
Which statements are true?
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(a) Alpha 1 antitrypsin is a protease inhibitor that is mainly biosynthesized by hepatocytes. This protein protects tissues from proteolytic enzyme damage, and this benefit appears to be protective with regards to white blood cells that produce neutrophil elastase. This defect can lead to tissue damage involving connective tissue in the lung and liver.
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(b) Upon genetic testing for alpha 1 antitrypsin, three alleles have been described, M, S, and Z. In examining the Proteinase inhibitor (Pi) locus, normal individuals have the MM alleles, heterozygotes have an M allele and a Z allele, while the presence of the homozygote ZZ alleles leads to the more severe form of protein misfolding. Individuals who are PiSZ have an increased risk of liver or lung disease.
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(c) There have been sporadic reports of acquired alpha 1 antitrypsin deficiency, especially in Tropical Pulmonary Eosinophilia. In individuals with Tropical Pulmonary Eosinophilia due to intestinal worm infestation, low levels of the protein, alpha 1 antitrypsin, have been reported. These individuals have normal M1 or M2 alleles.
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(d) Alpha 1 antitrypsin deficiency-related liver disease cannot be treated with augmentation therapy (using alpha 1 antitrypsin protein purified from plasma of healthy humans).
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5.
What is the most effective initial treatment for Wilson Disease?
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(a) A low copper diet is not effective for decoppering an individual with Wilson disease.
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(b) The United States Food and Drug Administration did not approve zinc supplements for the initial decoppering of individuals with Wilson disease.
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(c) Penicillamine is the preferred treatment for the initial decoppering of an individual with Wilson disease.
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(d) Trientine is used for decoppering individuals with Wilson disease who are intolerant of penicillamine.
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Pardo Lameda, I.L., Koch, T.R. (2020). Acquired Metabolic Disorders. In: Radu-Ionita, F., Pyrsopoulos, N., Jinga, M., Tintoiu, I., Sun, Z., Bontas, E. (eds) Liver Diseases. Springer, Cham. https://doi.org/10.1007/978-3-030-24432-3_10
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