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- W2020075034 abstract "Mitochondrial fatty acid β-oxidation was studied by incubating stable isotope-labeled fatty acid probes with human fibroblasts in the presence of L-carnitine. The acylcarnitine intermediates produced were analyzed by tandem mass spectrometry. Oxidation by normal fibroblasts produced specific acylcarnitine intermediates corresponding to acyl-CoA dehydrogenase substrates mainly of 10 or less carbons. These probes demonstrated that the pathway, involving all β-oxidative steps, could be examined. Oxidation of the same precursors by cells with medium chain acyl-CoA dehydrogenase (EC 1.3.99.2) (MCAD) deficiency, which is caused by different DNA mutations, produced acylcarnitine profiles which appear to be specific to this enzyme defect, regardless of the DNA mutation. Increased amounts of octanoyl-, decanoyl-, or decenoylcarnitine were detected. The ratios of octanoylcarnitine to decanoyl- or decenoylcarnitine appear specific for MCAD deficiency, Even though the concentration of labeled decenoylcarnitine (C10:1) was elevated in incubations of MCAD-deficient cells with labeled linoleate or with a fatty acid mixture which included palmitate, oleate, and linoleate, the predominant intermediate was octanoylcarnitines. These results suggest that MCAD-deficient cells readily convert decenoyl-CoA into octanoyl-Coa. This in vitro system could be utilized to study fatty acid oxidation disorders and to study the origins of metabolic intermediates associated with them." @default.
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- W2020075034 date "1995-02-01" @default.
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- W2020075034 title "Investigation of β-Oxidation Intermediates in Normal and MCAD-Deficient Human Fibroblasts Using Tandem Mass Spectrometry" @default.
- W2020075034 doi "https://doi.org/10.1006/bmme.1995.1009" @default.
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