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Degradation of bidentate-coordinated platinum(II)-based DNA intercalators by reduced l-glutathione

Kemp, S. and Wheate, N.J. and Pisani, Michelle J. and Aldrich-Wright, J.R. (2008) Degradation of bidentate-coordinated platinum(II)-based DNA intercalators by reduced l-glutathione. Journal of Medicinal Chemistry, 51 (9). pp. 2787-2794. ISSN 0022-2623

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We have examined the interaction of [(5,6-dimethyl-1,10-phenanthroline)(1S,2S-diaminocyclohexane)platinum(II)]2+ (1, 56MESS), [(5-methyl-1,10-phenanthroline)(1S,2S-diaminocyclohexane)platinum(II)]2+ (2, 5MESS), [(5,6-dimethyl-1,10-phenanthroline)(1R,2R-diaminocyclohexane)platinum(II)]2+ (3, 56MERR), and [(5,6-dimethyl-1,10-phenanthroline)(ethylenediamine)platinum(II)]2+ (4, 56MEEN) with reduced l-glutathione and l-methionine. Both thiols degrade all four complexes, mainly by displacing the ancillary ligand and forming a doubly bridged dinuclear complex. The degradation half-life of all the complexes with methionine is >7 days, indicating that these reactions are not biologically relevant. The rate of degradation by glutathione appears to be particularly important and shows an inverse correlation to cytotoxicity. The least active complex, 4 (t1/2 glutathione: 20 h), degrades fastest, followed by 3 (31 h), 2 (40 h), and 1 (68 h). The major degradation product, [bis-μ-{reduced l-glutathione}bis{5,6-dimethyl-1,10-phenanthroline}bis{platinum(II)}]2+ (5, 56MEGL), displays no cytotoxicity and is excluded as the source of the anticancer activity. Once bound by glutathione, these metal complexes do not then form coordinate bonds with guanosine. Partial encapsulation of the complexes within cucurbit[n]urils is able to stop the degradation process.

Item type: Article
ID code: 12969
Keywords: bidentate-coordinated platinum(II), DNA intercalators, l-glutathione, biomedical sciences, pharmacology, Therapeutics. Pharmacology, Pharmacy and materia medica, Microbiology, Drug Discovery, Molecular Medicine
Subjects: Medicine > Therapeutics. Pharmacology
Medicine > Pharmacy and materia medica
Science > Microbiology
Department: Faculty of Science > Strathclyde Institute of Pharmacy and Biomedical Sciences
Depositing user: Ms Ann Barker-Myles
Date Deposited: 28 Aug 2009 10:47
Last modified: 21 May 2015 11:00

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