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Induction of S100B secretion in C6 astroglial cells by the major metabolites accumulating in glutaric acidemia type I

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Abstract

Glutaryl-CoA dehydrogenase deficiency or glutaric acidemia type I (GA I) is an inherited neurometabolic disorder biochemically characterized by tissue accumulation of predominantly glutaric (GA) and 3-hydroxyglutaric (3OHGA) acids and clinically by severe neurological symptoms and structural brain abnormalities, manifested as progressive cerebral atrophy and acute striatum degeneration following encephalopathic crises, whose pathophysiology is still in debate. Considering that reactive astrogliosis is a common finding in brain of GA I patients, in the present study we investigated the effects of GA and 3OHGA on glial activity determined by S100B release by rat C6-glioma cells. We also evaluated the effects of these organic acids on some parameters of oxidative stress in these astroglial cells. We observed that GA and 3OHGA significantly increased S100B secretion and thiobarbituric acid-reactive substances (lipid peroxidation), whereas GA markedly decreased reduced glutathione levels in these glioma cells. This is the first report demonstrating that the major metabolites accumulating in GA I activate S100B secretion in astroglial cells, indicating activation of these cells. We also showed that GA and 3OHGA induced oxidative stress in C6 lineage cells, confirming previous findings observed in brain fresh tissue. It is therefore presumed that reactive glial cells and oxidative damage may underlie at least in part the neuropathology of GA I.

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Acknowledgements

This work was supported by the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), FAPERGS, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), FINEP/ Rede IBN 01.06.0842-00 and INCT-EN National Institute of Science and Technology for Excitotoxicity and Neuroprotection.

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  1. Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal de Rio Grande do Sul, Rua Ramiro Barcelos, 2600 – Anexo, CEP 90035-003, Porto Alegre, Brazil

    André Quincozes-Santos, Rafael Borba Rosa, Guilhian Leipnitz, Daniela Fraga de Souza, Bianca Seminotti, Moacir Wajner & Carlos Alberto Gonçalves

  2. Hospital de Clínicas, Serviço de Genética Médica, Porto Alegre, RS, Brazil

    Moacir Wajner

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  1. André Quincozes-Santos
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  2. Rafael Borba Rosa
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  3. Guilhian Leipnitz
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  4. Daniela Fraga de Souza
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Correspondence to Carlos Alberto Gonçalves.

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Quincozes-Santos, A., Rosa, R.B., Leipnitz, G. et al. Induction of S100B secretion in C6 astroglial cells by the major metabolites accumulating in glutaric acidemia type I. Metab Brain Dis 25, 191–198 (2010). https://doi.org/10.1007/s11011-010-9203-0

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