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Separation and characterization of oxaliplatin dinucleotides from DNA using HPLC-ESI ion trap mass spectrometry

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Abstract

Oxaliplatin is a third-generation platinum complex, and has a broad spectrum of antitumor activity. Such platinum complexes with the DACH carrier ligand have recently received increasing attention since they show efficacy against cisplatin-resistant cell lines. As the foremost indication of antitumor activity of platinum drugs is the formation of adducts with genomic DNA, calf thymus DNA-oxaliplatin adducts were the major target in this study. Calf thymus DNA was incubated with oxaliplatin, resulting in the formation of a large number of platinum-DNA adducts. Treated DNA was digested into the dinucleotides with a combination of enzymes, namely, benzonase, alkaline phosphatase, and nuclease S1. Using a high-performance liquid chromatography, we carried out the separation of individual platinum-DNA adducts which were concurrently identified using electrospray ionization ion trap mass spectrometry (MS). Both 1,2-intrastrand and 1,2-interstrand cross-linked adducts were found; however, those of the intrastrand nature have a considerably higher abundance than those of the interstrand cross-links. Among them, d(GpG)-oxaliplatin was the most abundant bifuctional adduct. To a lesser extent, a few monofunctional adducts were detected as well. MSn experiments served to ascertain the detailed structures of oxaliplatin adducts of dinucleoside monophosphates and of dinucleotides.

Three-dimensional view of the d(GpG)-Pt(DACH) adduct of m/z 902 (a) and of the d(ApG)-Pt(DACH) adduct of m/z 886 (b). DACH 1,2-diaminocyclohexane, green phosphorus, red oxygen, light blue carbon, dark blue nitrogen, gray platinum

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Acknowledgements

We are grateful to the Arab Republic of Egypt for a grant to S.M. and to the DFG for financial support to M.L.; Stefan Pieper’s expert technical assistance with the mass spectrometer is also gratefully acknowledged.

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Authors and Affiliations

  1. Department of Chemistry, Humboldt Universitaet zu Berlin, Brook-Taylor-Str. 2, 12489, Berlin, Germany

    Shereen Mowaka & Michael Linscheid

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  1. Shereen Mowaka
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  2. Michael Linscheid
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Correspondence to Michael Linscheid.

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Mowaka, S., Linscheid, M. Separation and characterization of oxaliplatin dinucleotides from DNA using HPLC-ESI ion trap mass spectrometry. Anal Bioanal Chem 392, 819–830 (2008). https://doi.org/10.1007/s00216-008-2311-6

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  • DOI: https://doi.org/10.1007/s00216-008-2311-6

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