| Antioxidant dysfunction: potential risk for neurotoxicity in ethylmalonic aciduria. | |
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MedLine Citation:
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PMID: 20443061 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Mitochondrial dysfunction and oxidative stress are central to the molecular basis of several human diseases associated with neuromuscular disabilities. We hypothesize that mitochondrial dysfunction also contributes to the neuromuscular symptoms observed in patients with ethylmalonic aciduria and homozygosity for ACADS c.625G>A-a common variant of the short-chain acyl-coenzyme A (CoA) dehydrogenase (SCAD) enzyme in the mitochondrial fatty acid oxidation pathway. This study sought to identify the specific factors that initiate cell dysfunction in these patients. We investigated fibroblast cultures from 10 patients with neuromuscular disabilities, elevated levels of ethylmalonic acid (EMA) (>50 mmol/mol creatinine), and ACADS c.625G>A homozygosity. Functional analyses, i.e., ACADS gene and protein expression as well as SCAD enzyme activity measurements, were performed together with a global nano liquid chromatography tandem mass spectroscopy (nano-LC-MS/MS)-based screening of the mitochondrial proteome in patient fibroblasts. Moreover, cell viability of patient fibroblasts exposed to menadione-induced oxidative stress was evaluated. Loss of SCAD function was detected in the patient group, most likely due to decreased ACADS gene expression and/or elimination of misfolded SCAD protein. Analysis of the mitochondrial proteome in patient fibroblasts identified a number of differentially expressed protein candidates, including reduced expression of the antioxidant superoxide dismutase 2 (SOD2). Additionally, patient fibroblasts demonstrated significantly higher sensitivity to oxidative stress than control fibroblasts. We propose that reduced mitochondrial antioxidant capacity is a potential risk factor for ACADS c.625G>A-associated ethylmalonic aciduria and that mitochondrial dysfunction contributes to the neurotoxicity observed in patients. |
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Authors:
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Christina B Pedersen; Zarazuela Zolkipli; Søren Vang; Johan Palmfeldt; Margrethe Kjeldsen; Vibeke Stenbroen; Stinne P Schmidt; Ronald J A Wanders; Jos P N Ruiter; Flemming Wibrand; Ingrid Tein; Niels Gregersen |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-05-05 |
Journal Detail:
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Title: Journal of inherited metabolic disease Volume: 33 ISSN: 1573-2665 ISO Abbreviation: J. Inherit. Metab. Dis. Publication Date: 2010 Jun |
Date Detail:
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Created Date: 2010-05-27 Completed Date: 2010-09-28 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7910918 Medline TA: J Inherit Metab Dis Country: Netherlands |
Other Details:
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Languages: eng Pagination: 211-22 Citation Subset: IM |
Affiliation:
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Research Unit for Molecular Medicine, Aarhus University Hospital, Skejby, Brendstrupgaardsvej 100, Aarhus N, Denmark. cbak@ki.au.dk |
| Data Bank Information | |
Bank Name/Acc. No.:
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OMIM/201470; 602473 |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Antioxidants
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metabolism* Butyryl-CoA Dehydrogenase / genetics Cell Survival Child, Preschool Chromatography, Liquid / methods Fibroblasts / metabolism Homozygote Humans Malonates / urine* Mass Spectrometry / methods Metabolism, Inborn Errors / diagnosis*, genetics Mitochondria / metabolism Models, Genetic Oxidative Stress Proteomics / methods Risk Factors |
| Chemical | |
Reg. No./Substance:
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0/Antioxidants; 0/Malonates; 601-75-2/ethylmalonic acid; EC 1.3.99.2/Butyryl-CoA Dehydrogenase |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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