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Rapid Commun Mass Spectrom. 2011 Oct 15;25(19):2675-81. doi: 10.1002/rcm.5033.

Liquid chromatography/electrospray ionisation mass spectrometric tracking of 4-hydroxy-2(E)-nonenal biotransformations by mouse colon epithelial cells using [1,2-13C2]-4-hydroxy-2(E)-nonenal as stable isotope tracer.

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INRA, UMR1331, Toxalim, Research Center in Food Toxicology, F-31027 Toulouse, France.


4-Hydroxy-2(E)-nonenal (HNE), a product of lipid peroxidation, has been extensively studied in several areas, including metabolism with radio-isotopes and quantification in various matrices with deuterium-labelled HNE as standard. The aim of this work was to evaluate the relevance of (13)C-labelled HNE in biotransformation studies to discriminate metabolites from endogens by liquid chromatography/electrospray ionisation mass spectrometry (LC/ESI-MS). (13)C-Labelled HNE was synthesised in improved overall yield (20%), with the incorporation of two labels in the molecule. Immortalised mouse colon epithelial cells were incubated with 2:3 molar amounts of HNE/(13)C-HNE in order to gain information on the detection of metabolites in complex media. Our results demonstrated that the stable isotope m/z values determined by mass spectrometry were relevant in distinguishing metabolites from endogens, and that metabolite structures could be deduced. Six conjugate metabolites and 4-hydroxy-2(E)-nonenoic acid were identified, together with an incompletely identified metabolite. Stable-isotope-labelled HNE has already been used for quantification purposes. However, this is the first report on the use of (13)C-labelled HNE as a tracer for in vitro metabolism. (13)C-Labelled HNE could also be of benefit for in vivo studies.

[Indexed for MEDLINE]

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