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A dinuclear monofunctional platinum(II) complex with an aromatic linker shows low reactivity towards glutathione but high DNA binding ability and antitumor activity

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Abstract

Multinuclear Pt(II) complexes represent a novel class of antitumor agents. In this work, a dinuclear monofunctional Pt(II) complex {[cis-Pt(NH3)2Cl]2(4,4′-methylenedianiline)}(NO3)2 (1) was synthesized and characterized by 1H NMR, electrospray mass spectrometry, and elemental analysis. The 2D [1H,15N] heteronuclear single quantum coherence NMR spectra of 15N-labeled 1 revealed that the cationic core of this water-soluble complex hardly hydrolyzes in aqueous solution and reacts very slowly with glutathione. Hydrolysis appears not to be an essential step for the formation of Pt–guanosine-5′-monophosphate (5′-GMP) or Pt–DNA adducts because the complex can react readily with 5′-GMP and partially transform B-DNA into its Z form. Such properties are desired to achieve the goal of enhancing cytotoxicity and lowering side effects of Pt(II) complexes. In fact, complex 1 is highly cytotoxic against the murine leukemia (P-388) and the human non-small-cell lung cancer (A-549) cell lines, and it is more cytotoxic than cisplatin at most concentrations tested.

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Acknowledgements

Financial support from the National Natural Science Foundation of China (nos. 20231010, 20228102, 30370351) and the Natural Science Foundation of Jiangsu Province (no. BK 2005209) is gratefully acknowledged.

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Correspondence to Xiaoyong Wang or Zijian Guo.

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Fan, D., Yang, X., Wang, X. et al. A dinuclear monofunctional platinum(II) complex with an aromatic linker shows low reactivity towards glutathione but high DNA binding ability and antitumor activity. J Biol Inorg Chem 12, 655–665 (2007). https://doi.org/10.1007/s00775-007-0214-1

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