Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0024523 (malabsorption)
 7,319 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The use of elevated dosages of vitamin E in humans has led to the discovery of vitamin E deficiency syndromes in neurological areas. This evidence comes from careful clinical studies in which elevated vitamin E dosages were applied. In long-term studies it has now been established that retinal and neurological abnormalities are due to vitamin E deficiency and can be ameliorated by therapy with a large amount of the vitamin enterally or parenterally, which can possibly completely prevent the development of clinical manifestations if adequate treatment is given from an early age. It has also become clear that similar neurological and ocular lesions occur in other chronic fat malabsorptive states such as cholestatic liver diseases, cystic fibrosis, and extensive resection of the gut, with respect to an elevated dosage of vitamin E therapy. More recently, several patients with spinocerebellar degeneration from vitamin E deficiency without other evidence of malabsorption have been reported on in whom the progression of the diseases is cessated by the vitamin E therapy. Whether or not the use of elevated dosages of vitamin E should be recommended for certain diseases in premature infants is controversial. Previously, it has been thought that newborn infants, especially premature infants, suffer from vitamin E deficiency, because of their low plasma vitamin E concentrations and high susceptibility of erythrocytes to hydrogen peroxide hemolysis test. Furthermore, tocopherol deficiency has been implicated in four neonatal conditions: anemia of prematurity, retrolental fibroplasia (RLF), bronchopulmonary dysplasia (BPD), and intraventricular hemorrhage (IVH). A hemolytic anemia, associated with thrombocytosis and edema, which is responsive to vitamin E therapy, is not well recognized and occurs in a minority of preterm infants, who were given high amounts of polyunsaturated fatty acids in their formula. However, prophylactic use of an elevated dosage of vitamin E to prevent anemia in the majority of premature infants is controversial. There is no evidence for beneficial effects in BPD. In addition, the prophylactic use of pharmacological dosages of vitamin E for prevention of RLF and IVH has also had conflicting results. In the course of therapy with elevated dosages of vitamin E, administered either orally, intramuscularly, or intravenously, many problems arose in the infants, such as unexpected death, increased frequency of necrotizing enterocolitis (NEC) and sepsis, and the development of unusual symptoms including hepatic injuries.(ABSTRACT TRUNCATED AT 400 WORDS)
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PMID:Use and safety of elevated dosages of vitamin E in infants and children. 250 8

Certain owl monkeys (AOT) develop spontaneous hemolytic anemia that responds to vitamin E. The anemia is associated with red blood cell lipid peroxidation and altered red blood cell membrane lipid composition. To investigate these changes, plasma lipid and lipoprotein profiles were characterized in anemic, anemia-susceptible, and anemia-resistant AOT. The plasma vitamin E and vitamin A concentrations were assessed as an index of fat absorption and the effect of corn oil supplementation and vitamin E-selenium injection were measured. Anemia-susceptible AOT had depressed plasma levels of vitamin E and A and an altered lipoprotein metabolism characterized by elevated ratios of low/high density lipoprotein cholesterol and free to esterified cholesterol in these lipoproteins. Vitamin E-selenium injection in anemia-susceptible AOT increased the plasma vitamin E, and vitamin E and corn oil supplements reduced the high density lipoprotein free to esterified cholesterol ratio. The data suggest that the AOT suffer from fat malabsorption and that the consequences (including tocopherol deficiency) result in altered cholesterol metabolism.
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PMID:Altered lipoprotein metabolism in spontaneous vitamin E deficiency of owl monkeys. 641 97