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Establishment of reference values for the lysine acetylation marker Nɛ-acetyllysine in small volume human plasma samples by a multi-target LC–MS/MS method

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Abstract

Cardiovascular disease (CVD) and chronic kidney disease (CKD) constitute substantial burdens for public health. The identification and validation of risk markers for CVD and CKD in epidemiological studies requires frequent adaption of existing analytical methods as well as development of new methods. In this study, an analytical procedure to simultaneously quantify ten endogenous biomarkers for CVD and CKD is described. An easy-to-handle sample preparation requiring only 20 µL of human plasma is followed by liquid chromatography coupled to tandem mass spectrometry (LC–MS/MS). The method was successfully validated according to established guidelines meeting required criteria for accuracy, precision, recovery, linearity, selectivity, and limits of quantification. The scalability of the method for application in larger cohorts was assessed using a set of plasma samples from healthy volunteers (n = 391) providing first reference values for the recently established biomarker Nɛ-acetyllysine (Nɛ-AcLys). Other biomarkers analyzed were creatinine, β-aminoisobutyric acid (β-AIB), carnitine, 1-methylnicotinamide (1-MNA), citrulline, symmetric dimethylarginine (SDMA), asymmetric dimethylarginine (ADMA), homoarginine (hArg), and ornithine. All obtained results are within reference values specified elsewhere. Overall, these results demonstrate the suitability of the method for simultaneous quantification of ten endogenous biomarkers for CVD and CKD in plasma samples from larger cohorts and allow validation of Nɛ-AcLys as a biomarker in large cohorts.

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Acknowledgements

This work was supported by the STAEDTLER foundation (grant 34/14).

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AG, MM, DA, AC, FM, MFF, and RM designed research, performed research, and analyzed data. AG, MM, MFF, and RM wrote the manuscript. All authors reviewed and approved the final version of the manuscript.

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Correspondence to Arne Gessner.

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Conflict of interest

FM is an employee of Boehringer Ingelheim. The other authors declare that they have no conflict of interest.

Research involving human participants and/or animals

This study involved human participants. It was approved by the Ethics committee of the Friedrich-Alexander-Universität Erlangen-Nürnberg and conducted according to the Declaration of Helsinki.

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All participants provided written informed consent.

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Handling Editor: D. Tsikas.

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Gessner, A., Mieth, M., Auge, D. et al. Establishment of reference values for the lysine acetylation marker Nɛ-acetyllysine in small volume human plasma samples by a multi-target LC–MS/MS method. Amino Acids 51, 1259–1271 (2019). https://doi.org/10.1007/s00726-019-02765-8

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  • DOI: https://doi.org/10.1007/s00726-019-02765-8

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