Document Detail


Metabolic acetate therapy improves phenotype in the tremor rat model of Canavan disease.
MedLine Citation:
PMID:  20464498     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Genetic mutations that severely diminish the activity of aspartoacylase (ASPA) result in the fatal brain dysmyelinating disorder, Canavan disease. There is no effective treatment. ASPA produces free acetate from the concentrated brain metabolite, N-acetylaspartate (NAA). Because acetyl coenzyme A is a key building block for lipid synthesis, we postulated that the inability to catabolize NAA leads to a brain acetate deficiency during a critical period of CNS development, impairing myelination and possibly other aspects of brain development. We tested the hypothesis that acetate supplementation during postnatal myelination would ameliorate the severe phenotype associated with ASPA deficiency using the tremor rat model of Canavan disease. Glyceryltriacetate (GTA) was administered orally to tremor rats starting 7 days after birth, and was continued in food and water after weaning. Motor function, myelin lipids, and brain vacuolation were analyzed in GTA-treated and untreated tremor rats. Significant improvements were observed in motor performance and myelin galactocerebroside content in tremor rats treated with GTA. Further, brain vacuolation was modestly reduced, and these reductions were positively correlated with improved motor performance. We also examined the expression of the acetyl coenzyme A synthesizing enzyme acetyl coenzyme A synthase 1 and found upregulation of expression in tremor rats, with a return to near normal expression levels in GTA-treated tremor rats. These results confirm the critical role played by NAA-derived acetate in brain myelination and development, and demonstrate the potential usefulness of acetate therapy for the treatment of Canavan disease.
Authors:
Peethambaran Arun; Chikkathur N Madhavarao; John R Moffett; Kristen Hamilton; Neil E Grunberg; Prasanth S Ariyannur; William A Gahl; Yair Anikster; Steven Mog; William C Hallows; John M Denu; Aryan M A Namboodiri
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't     Date:  2010-05-13
Journal Detail:
Title:  Journal of inherited metabolic disease     Volume:  33     ISSN:  1573-2665     ISO Abbreviation:  J. Inherit. Metab. Dis.     Publication Date:  2010 Jun 
Date Detail:
Created Date:  2010-05-27     Completed Date:  2010-09-28     Revised Date:  2014-09-16    
Medline Journal Info:
Nlm Unique ID:  7910918     Medline TA:  J Inherit Metab Dis     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  195-210     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Acetates / therapeutic use*
Animals
Aspartic Acid / analogs & derivatives*,  metabolism,  therapeutic use
Brain / metabolism
Canavan Disease / therapy*
Disease Models, Animal
Female
Heterozygote
Lipids / chemistry
Male
Mutation*
Myelin Sheath / chemistry
Phenotype
Rats
Treatment Outcome
Grant Support
ID/Acronym/Agency:
NS39387/NS/NINDS NIH HHS; R01 GM065386/GM/NIGMS NIH HHS; R01 GM065386-08/GM/NIGMS NIH HHS
Chemical
Reg. No./Substance:
0/Acetates; 0/Lipids; 30KYC7MIAI/Aspartic Acid; 997-55-7/N-acetylaspartate
Comments/Corrections

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