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Acute and Chronic Administration of the Branched-Chain Amino Acids Decreases Nerve Growth Factor in Rat Hippocampus

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Abstract

Maple syrup urine disease (MSUD) is a neurometabolic disorder caused by deficiency of the activity of the mitochondrial enzyme complex branched-chain α-keto acid dehydrogenase leading to accumulation of the branched-chain amino acids (BCAA) and their corresponding branched-chain α-keto acids. In this study, we examined the effects of acute and chronic administration of BCAA on protein levels and mRNA expression of nerve growth factor (NGF) considering that patients with MSUD present neurological dysfunction and cognitive impairment. Considering previous observations, it is suggested that oxidative stress may be involved in the pathophysiology of the neurological dysfunction of MSUD. We also investigated the influence of antioxidant treatment (N-acetylcysteine and deferoxamine) in order to verify the influence of oxidative stress in the modulation of NGF levels. Our results demonstrated decreased protein levels of NGF in the hippocampus after acute and chronic administration of BCAA. In addition, we showed a significant decrease in the expression of ngf in the hippocampus only following acute administration in 10-day-old rats. Interestingly, antioxidant treatment was able to prevent the decrease in NGF levels by increasing ngf expression. In conclusion, the results suggest that BCAA is involved in the regulation of NGF in the developing rat. Thus, it is possible that alteration of neurotrophin levels during brain maturation could be of pivotal importance in the impairment of cognition provoked by BCAA. Moreover, the decrease in NGF levels was prevented by antioxidant treatment, reinforcing that the hypothesis of oxidative stress can be an important pathophysiological mechanism underlying the brain damage observed in MSUD.

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Acknowledgments

This research was supported by grants from Programa de Pós-graduação em Ciências da Saúde–Universidade do Extremo Sul Catarinense (UNESC), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), and Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq). The authors declare that they have not had any financial, personal, or other relationships that have influenced the work.

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Authors and Affiliations

  1. Laboratório de Bioenergética e Núcleo de Excelência em Neurociências Aplicadas de Santa Catarina (NENASC), Programa de Pós-Graduação em Ciências da Saúde, Universidade do Extremo Sul Catarinense, Criciúma, SC, Brazil

    Giselli Scaini, Lis Mairá Mello-Santos, Camila B. Furlanetto, Isabela C. Jeremias, Francielle Mina & Emilio L. Streck

  2. Instituto Nacional de Ciência e Tecnologia Translacional em Medicina (INCT-TM), Porto Alegre, RS, Brazil

    Giselli Scaini, Lis Mairá Mello-Santos, Camila B. Furlanetto, Isabela C. Jeremias, Francielle Mina, Luiza W. Kist, Talita C. B. Pereira, Maurício R. Bogo & Emilio L. Streck

  3. Laboratório de Erros Inatos do Metabolismo, Programa de Pós-Graduação em Ciências da Saúde, Universidade do Extremo Sul Catarinense, Criciúma, SC, Brazil

    Patrícia F. Schuck & Gustavo C. Ferreira

  4. Laboratório de Biologia Genômica e Molecular, Departamento de Biologia Celular e Molecular, Faculdade de Biociências, Pontifícia Universidade Católica do Rio Grande do Sul, Porto Alegre, RS, Brazil

    Luiza W. Kist, Talita C. B. Pereira & Maurício R. Bogo

  5. Laboratório de Bioenergética, Universidade do Extremo Sul Catarinense, Av. Universitária, 1105, Criciúma, 88806-000, SC, Brazil

    Emilio L. Streck

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  1. Giselli Scaini
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Scaini, G., Mello-Santos, L.M., Furlanetto, C.B. et al. Acute and Chronic Administration of the Branched-Chain Amino Acids Decreases Nerve Growth Factor in Rat Hippocampus. Mol Neurobiol 48, 581–589 (2013). https://doi.org/10.1007/s12035-013-8447-1

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