Following our strategy of coupling cyclin-dependent kinase (Cdk) inhibitors with organometallic moieties to improve their physicochemical properties and bioavailability, five organoruthenium complexes (1c-5c) of the general formula [RuCl(η(6)-arene)(L)]Cl have been synthesized in which the arene is 4-formylphenoxyacetyl-η(6)-benzylamide and L is a Cdk inhibitor [3-(1H-benzimidazol-2-yl)-1H-pyrazolo[3,4-b]pyridines (L1-L3) and indolo[3,2-d]benzazepines (L4 and L5)]. All of the compounds were characterized by spectroscopic and analytical methods. Upon prolonged standing (2-3 months) at room temperature, the dimethyl sulfoxide (DMSO) solutions of 1c and 2c(-HCl) afforded residues, which after recrystallization from EtOH and EtOH/H(2)O, respectively, were shown by X-ray diffraction to be cis,cis-[Ru(II)Cl(2)(DMSO)(2)(L1)]·H(2)O and mer-[Ru(II)Cl(DMSO)(3)(L2-H)]·H(2)O. Compound 5c, with a coordinated amidine unit, undergoes E/Z isomerization in solution. The antiproliferative activities and effects on the cell cycle of the new compounds were evaluated. Complexes 1c-5c are moderately cytotoxic to cancer cells (CH1, SW480, A549, A2780, and A2780cisR cell lines). Therefore, in order to improve their antiproliferative effects, as well as their drug targeting and delivery to cancer cells, 1c-5c were conjugated to recombinant human serum albumin, potentially exploiting the so-called "enhanced permeability and retention" effect that results in the accumulation of macromolecules in tumors. Notably, a marked increase in cytotoxicity of the albumin conjugates was observed in all cases.
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[Show abstract][Hide abstract] ABSTRACT: The present work was aimed that in vitro antioxidant activity of some novel synthetic mononuclear Ruthenium (II) compounds namely, Ru (1, 10-phenanthroline) 2 (2-nitro Phenyl thiosemicarbazone)Cl 2 (compound R 1) and Ru (1, 10-phenanthroline) 2 (2-hydroxy-phenyl thiosemicarbazone)Cl 2 (compound R 2) using [2, 29-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid)] (ABTS), Ferric reducing antioxidant power (FRAP), N, N-dimethyl-p-phenylenediamine (DMPD), 1, 1-diphenyl-2-picryl hydrazine (DPPH) and Nitro blue tetrazolium (NBT) assays. The results concluded that both the compounds (R 1 &R 2) exhibited a significant antioxidant activity. But compared to reference standards, R 1 was found to be better free radical scavenging activity than R 2 .
Letters in Drug Design & Discovery 05/2012; 9(4):421-425. DOI:10.2174/157018012799859927 · 0.77 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: In this work several quantum properties including the NEDA and QTAIM are computed on three models of rapta-C complexes using DFT with hybrid functional and basis set with ECP and without ECP. Several interesting correlations within the observed properties and also with the reported experimental behaviors of these complexes including their biological activities are presented. The study shows that the stability of the two complexes with bidentate ligands is associated with their high hydrogen bonding stability and existence of stronger non-covalent metal-ligand bonds. The energy decomposition analysis indicated that inter-atomic interactions in the three forms of rapta-C complexes and their stability are governed by the charge transfer term with significant contributions from polarization and electrostatic terms. The higher stability of complex 1 and 2 over 3 comes from the lower exchange repulsion and higher polarization contributions to their stability which agrees perfectly with the experimental observation. Our results provide insight into the nature of intramolecular forces that influence the structural stability of the three complexes.
[Show abstract][Hide abstract] ABSTRACT: Six novel ruthenium(II)- and osmium(II)-arene complexes with indoloquinoline modified ligands containing methyl and halo substituents in position 8 of the molecule backbone have been synthesised and comprehensively characterised by spectroscopic methods (1H, 13C NMR, UV-Vis), ESI mass spectrometry and X-ray crystallography. Binding of indoloquinolines to a metal-arene scaffold makes the products soluble enough in biological media to allow for assaying their antiproliferative activity. The complexes were tested in three human cancer cell lines, namely A549 (non-small cell lung cancer), SW480 (colon carcinoma) and CH1 (ovarian carcinoma), yielding IC50 values in the 10-6-10-7 M concentration range after continuous exposure for 96 h. Compounds with halo substituents in position 8 are more effective cytotoxic agents in vitro than the previously reported species halogenated in position 2 of the indoloquinoline backbone. High antiproliferative activity of both series of substances may be due at least in part to their potential to act as DNA intercalators.