Fast cleavage of a diselenide induced by a platinum(II)-methionine complex and its biological implications |
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| Authors: | Qin Liu Xiaoyong Wang Xiaoliang Yang Zijian Guo |
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| Affiliation: | a Applied Chemistry Department, Nanjing University of Finance and Economics, Nanjing 210003, PR Chinab State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing 210093, PR Chinac State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, PR China |
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| Abstract: | Platinum-based anticancer drugs such as cisplatin induce increased oxidative stress and oxidative damage of DNA and other cellular components, while selenium plays an important role in the antioxidant defense system. In this study, the interaction between a platinum(II) methionine (Met) complex [Pt(Met)Cl2] and a diselenide compound selenocystine [(Sec)2] was studied by electrospray ionization mass spectrometry, high performance liquid chromatography mass spectrometry, and 1H NMR spectroscopy. The results demonstrate that the diselenide bond in (Sec)2 can readily and quickly be cleaved by the platinum complex. Formation of the selenocysteine (Sec) bridged dinuclear complex [Pt2(Met-S,N)2(μ-Sec-Se,Cl)]3+ and Sec chelated species [Pt(Met-S,N)(Sec-Se,N)]2+ was identified at neutral and acidic media, which seems to result from the intermediate [Pt(Met-S,N)(Sec-Se)Cl]+. An accelerated formation of S-Se and S-S bonds was also observed when (Sec)2 reacted with excessive glutathione in the presence of [Pt(Met)Cl2]. These results imply that the mechanism of activity and toxicity of platinum drugs may be related to their fast reaction with seleno-containing biomolecules, and the chemoprotective property of selenium agents against cisplatin-induced toxicity could also be connected with such reactions. |
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| Keywords: | Anticancer drug Platinum complex Diselenide Selenocystine Selenium-sulfur bond |
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