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Comparative study of the oxidation behavior of sulfur-containing amino acids and glutathione by electrochemistry-mass spectrometry in the presence and absence of cisplatin

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Abstract

Small sulfur-containing compounds are involved in several important biochemical processes, including—but not limited to—redox regulation and drug conjugation/detoxification. While methods for stable redox pairs of such compounds (thiols/disulfides) are available, analytical data on more labile and short-lived redox intermediates are scarce, due to highly challenging analytical requirements. In this study, we employ the direct combination of reagentless electrochemical oxidation and mass spectrometric (EC-MS) identification for monitoring oxidation reactions of cysteine, N-acetylcysteine, methionine, and glutathione under simulated physiological conditions (pH 7.4, 37 °C). For the first time, all theoretically expected redox intermediates—with only one exception—are detected simultaneously and in situ, including sulfenic, sulfinic, and sulfonic acids, disulfides, thiosulfinates, thiosulfonates, and sulfoxides. By monitoring the time/potential-dependent interconversion of sulfur species, mechanistic oxidation routes are confirmed and new reactions detected, e.g., sulfenamide formation due to reaction with ammonia from the buffer. Furthermore, our results demonstrate a highly significant impact of cisplatin on the redox reactivity of sulfur species. Namely, the amount of thiol oxidation to sulfonic acid via sulfenic and sulfinic acid intermediates is diminished for glutathione in the presence of cisplatin in favor of the disulfide formation, while for N-acetylcysteine the contrary applies. N-acetylcysteine is the only ligand which displays enhanced oxidation currents upon cisplatin addition, accompanied by increased levels of thiosulfinate and thiosulfonate species. This is traced back to thiol reactivity and highlights the important role of sulfenic acid intermediates, which may function as a switch between different oxidation routes.

Electrochemistry-Mass spectrometry reveals changes in the oxidation pathway of thiols in the presence of cisplatin and enables detection of labile reaction intermediates

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Acknowledgments

We thank the Deutsche Forschungsgemeinschaft for financial support (grant WE 2422/7-1). The financial support from the Ministerium für Innovation, Wissenschaft und Forschung des Landes Nordrhein-Westfalen and by the Bundesministerium für Bildung und Forschung is also gratefully acknowledged.

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  1. Leibniz-Institut für Analytische Wissenschaften – ISAS e.V., Otto-Hahn-Str. 6b, 44227, Dortmund, Germany

    Robert Zabel & Günther Weber

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  1. Robert Zabel
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Correspondence to Günther Weber.

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Zabel, R., Weber, G. Comparative study of the oxidation behavior of sulfur-containing amino acids and glutathione by electrochemistry-mass spectrometry in the presence and absence of cisplatin. Anal Bioanal Chem 408, 1237–1247 (2016). https://doi.org/10.1007/s00216-015-9233-x

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