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Oxidative Stress in Phenylketonuria: What is the Evidence?

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Abstract

Phenylketonuria (PKU) is an inborn error of amino acid metabolism caused by severe deficiency of phenylalanine hydroxylase activity, leading to the accumulation of phenylalanine and its metabolites in blood and tissues of affected patients. Phenylketonuric patients present as the major clinical feature mental retardation, whose pathomechanisms are poorly understood. In recent years, mounting evidence has emerged indicating that oxidative stress is possibly involved in the pathology of PKU. This article addresses some of the recent developments obtained from animal studies and from phenylketonuric patients indicating that oxidative stress may represent an important element in the pathophysiology of PKU. Several studies have shown that enzymatic and non-enzymatic antioxidant defenses are decreased in plasma and erythrocytes of PKU patients, which may be due to an increased free radical generation or secondary to the deprivation of micronutrients which are essential for these defenses. Indeed, markers of lipid, protein, and DNA oxidative damage have been reported in PKU patients, implying that reactive species production is increased in this disorder. A considerable set of data from in vitro and in vivo animal studies have shown that phenylalanine and/or its metabolites elicit reactive species in brain rodent. These findings point to a disruption of pro-oxidant/antioxidant balance in PKU. Considering that the brain is particularly vulnerable to oxidative attack, it is presumed that the administration of appropriate antioxidants as adjuvant agents, in addition to the usual treatment based on restricted diets or supplementation of tetrahydrobiopterin, may represent another step in the prevention of the neurological damage in PKU.

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Acknowledgments

This study was supported by CAPES, CNPq, and FIPE/HCPA-Brazil.

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Authors and Affiliations

  1. Programa de Pós-Graduação em Ciências Farmacêuticas, UFRGS, Av. Ipiranga 2752, Porto Alegre, RS, 90610-000, Brazil

    Graziela S. Ribas & Carmen R. Vargas

  2. Serviço de Genética Médica, HCPA, Rua Ramiro Barcelos 2350, Porto Alegre, RS, CEP 90035-903, Brazil

    Graziela S. Ribas, Angela Sitta, Moacir Wajner & Carmen R. Vargas

  3. Programa de Pós-Graduação em Ciências Biológicas: Bioquímica, UFRGS, Ramiro Barcelos 2700, Porto Alegre, RS, 90035-003, Brazil

    Angela Sitta, Moacir Wajner & Carmen R. Vargas

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  1. Graziela S. Ribas
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  2. Angela Sitta
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  3. Moacir Wajner
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  4. Carmen R. Vargas
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Correspondence to Carmen R. Vargas.

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Ribas, G.S., Sitta, A., Wajner, M. et al. Oxidative Stress in Phenylketonuria: What is the Evidence?. Cell Mol Neurobiol 31, 653–662 (2011). https://doi.org/10.1007/s10571-011-9693-2

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  • DOI: https://doi.org/10.1007/s10571-011-9693-2

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