Document Detail

Carnitine palmitoyltransferase 2 and carnitine/acylcarnitine translocase are involved in the mitochondrial synthesis and export of acylcarnitines.
MedLine Citation:
PMID:  23322164     Owner:  NLM     Status:  Publisher    
Acylcarnitines are commonly used in the diagnosis of mitochondrial fatty acid β-oxidation disorders (mFAODs). It is generally assumed that this plasma acylcarnitine profile reflects the mitochondrial accumulation of acyl-CoAs. The identity of the enzymes and the mitochondrial and plasmalemmal transporters involved in the synthesis and export of these metabolites have remained undefined. We used lentiviral shRNA to knock down the expression of medium-chain acyl-CoA dehydrogenase (MCAD) in control and carnitine palmitoyltransferase 2 (CPT2)-, carnitine/acylcarnitine translocase (CACT)-, and plasmalemmal carnitine transporter (OCTN2)-deficient human fibroblasts. These cell lines, including mock-transduced controls, were loaded with decanoic acid and carnitine, followed by the measurement of the acylcarnitine profile in the extracellular medium. In control fibroblasts, MCAD knockdown markedly increased the production of octanoylcarnitine (3-fold, P<0.01). OCTN2-deficient cell lines also showed extracellular accumulation of octanoylcarnitine (2.8-fold, P<0.01), suggesting that the cellular export of acylcarnitines does not depend on OCTN2. In contrast, in CPT2- and CACT-deficient cells, the accumulation of octanoylcarnitine in the medium did not significantly increase in the MCAD knockdown. Similar results were obtained using pharmacological inhibition of CPT2 in fibroblasts from MCAD-deficient individuals. This shows that CPT2 and CACT are crucial for mitochondrial acylcarnitine formation and export to the extracellular fluids in mFAOD.-Violante, S., IJlst, L., te Brinke, H., Tavares de Almeida, I., Wanders, R. J. A., Ventura, F. V., Houten, S. M. Carnitine palmitoyltransferase 2 and carnitine/acylcarnitine translocase are involved in the mitochondrial synthesis and export of acylcarnitines.
Sara Violante; Lodewijk Ijlst; Heleen Te Brinke; Isabel Tavares de Almeida; Ronald J A Wanders; Fátima V Ventura; Sander M Houten
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-15
Journal Detail:
Title:  FASEB journal : official publication of the Federation of American Societies for Experimental Biology     Volume:  -     ISSN:  1530-6860     ISO Abbreviation:  FASEB J.     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8804484     Medline TA:  FASEB J     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
*Metabolism and Genetics Group, Research Institute for Medicines and Pharmaceutical Sciences (iMed.UL), Faculdade de Farmácia, Universidade de Lisboa, Lisbon, Portugal; and.
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