Microbiome-derived trimethylamine N-oxide (TMAO) has been associated with platelet hyperreactivity
and subsequent atherogenesis. Whether physiological TMAO-levels influence plateletderived
lipid mediators remains unknown. Little is known about pre-analytic factors potentially
influencing TMAO concentrations. We aimed at developing a quantitative LC-MS/MS method to
investigate in-vivo and in-vitro pre-analytical factors in TMAO analysis to properly assess the proposed
activating effect of TMAO on platelets. TMAO, betaine, carnitine, and choline were analyzed
by HILIC-ESI-MS/MS within 6 min total run time. Method validation included investigation of
reproducibility, recovery, sensitivity, and in-vitro pre-analytical factors. A 24-h monitoring experiment
was performed, evaluating in-vivo pre-analytical factors like daytime or diet. Finally, the effects
of different TMAO concentrations on platelet activation and corresponding alterations of plateletderived
eicosanoid release were analyzed. The method showed high reproducibility (CVs 5.3%),
good recovery rates (96–98%), and negligible in-vitro pre-analytical effects. The influence of in-vivo
pre-analytical factors on TMAO levels was not observable within the applied experimental conditions.
We did not find any correlation between TMAO levels and platelet activation at physiological TMAO
concentrations, whereas platelet-derived eicosanoids presented activation of the cyclooxygenase and
lipoxygenase pathways. In contrast to previously published results, we did not find any indications
regarding diet dependency or circadian rhythmicity of TMAO levels. Our results do not support the
hypothesis that TMAO increases platelet responsiveness via the release of lipid-mediators.
| Identifer | oai:union.ndltd.org:DRESDEN/oai:qucosa:de:qucosa:89008 |
| Date | 15 January 2024 |
| Creators | Emonds, Julian Josef, Ringel, Clemens, Reinicke, Madlen, Müller, Daniel, von Eckardstein, Arnold, Meixensberger, Jürgen, Ceglarek, Uta, Gaudl, Alexander |
| Publisher | MDPI |
| Source Sets | Hochschulschriftenserver (HSSS) der SLUB Dresden |
| Language | English |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, doc-type:article, info:eu-repo/semantics/article, doc-type:Text |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | 3261 |
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