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Hanif, Muhammad; Henke, Helena; Meier, Samuel M; Martic, Sanela; Labib, Mahmoud; Kandioller, Wolfgang; Jakupec, Michael A; Arion, Vladimir B; Kraatz, Heinz-Bernhard; Keppler, Bernhard K; Hartinger, Christian G
Inorganic chemistry, 09/2010, Letnik: 49, Številka: 17Journal Article
Hydroxypyr(id)ones are versatile ligands for the synthesis of organometallic anticancer agents, equipping them with fine-tunable pharmacological properties. Herein, we report on the preparation, mode of action, and in vitro anticancer activity of RuII− and OsII−arene complexes with alkoxycarbonylmethyl-3-hydroxy-2-pyridone ligands. The hydrolysis and binding to amino acids proceed quickly, as characterized by NMR spectroscopy and ESI mass spectrometry. However, the reaction with amino acids causes cleavage of the pyridone ligands from the metal center because the amino acids act as multidentate ligands. A similar behavior was also observed during the reactions with the model proteins ubiquitin and cytochrome c, yielding mainly protein + M(η6-p-cymene) adducts (M = Ru, Os). Notably the ligand cleavage of the Os derivative was significantly slower than of its Ru analogue, which could explain its higher activity in in vitro anticancer assays. Furthermore, the reaction of the compounds to 5′-GMP was characterized and coordination to the N7 of the guanine moiety was demonstrated by 1H NMR spectroscopy and X-ray diffraction analysis. CDK2/Cyclin A protein kinase inhibition studies revealed potent activity of the Ru and Os complexes.
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