Binuclear ruthenium(II) polypyridyl complexes: DNA cleavage and mitochondria mediated apoptosis induction
摘要:
Binuclear complexes of the type [Ru-2(N-N)(4)(TBPhen(2))](4+), where N-N = 2,2'-bipyridine (bpy) (1), 1,10-phenanthroline (phen) (2), dipyrido[3,2-a:2',3'-c]phenazine (dppz) (3) and (TBPhen(2)) = bis-phenanthroline Troger's Base analogue, have been synthesized and characterized by H-1 NMR, IR, UV-Vis, elemental analysis, ESI-Mass spectroscopy and cyclic voltammetry. The DNA binding characteristics of the complexes have been investigated by absorbance, steady-state emission, thermal melting and viscosity measurements. Photophysical studies reveal that [Ru-2(TBPhen(2))(dppz)(4)](4+) interacts with calf thymus DNA with an intrinsic binding constant of (8.75 +/- 1.11 x 10(6) M-1). DNA cleavage studies of complexes 1-3 have been investigated using gel electrophoresis. The cytotoxicity of all the complexes against the HeLa cell line was evaluated by MTT assay and the status of mitochondria by real time living cell microscopy indicates apoptosis induction by complexes 1 and 2, further corroborated by a fluorescence microscopy-TUNEL assay. (c) 2012 Elsevier Ltd. All rights reserved.
Self-assembly of heteroleptic dinuclear metallosupramolecular kites from multivalent ligands via social self-sorting
作者:Christian Benkhäuser、Arne Lützen
DOI:10.3762/bjoc.11.79
日期:——
2'-bipyridine) ligand with a central 1,3-diethynylbenzene unit 2 were synthesized. Each of these ligands acts as a multivalent entity for the binding of two copper(I) ions. Upon coordination to the metal ions these two ligands undergo selective self-assembly into heteroleptic dinuclear metallosupramolecular kites in a high-fidelity social self-sorting manner as evidenced by NMR spectroscopy and mass spectrometry
A phenanthroline analogue of Tröger's base as bridging ligand in the synthesis of a bimetallic ruthenium (II) complex
作者:O. Van Gijte、A. Tatibouët、M. Demeunynck、J. Lhomme、A. Kirsch-De Mesmaeker
DOI:10.1016/s0040-4039(97)00151-2
日期:1997.3
Complexation of a Phenanthroline analogue of Tröger'sBase 2 to Ru(Bpy)22+ units results in the formation of a dinuclear complex 3. The spectroscopic data in absorption and emission indicate that the resulting dinuclear compound 3 behaves as two independent monometallic Ru(II) complexes.
We report the synthesis of an asymmetric Troger base containing the two well characterised DNA binding chromophores. proflavine and phenanthroline. The mode of interaction of the hybrid molecule A as investigated by circular and linear dichroism experiments and a biochemical assay using DNA topoisomerase 1. The data are compatible with a model in which the proflavine moiety intercalates between DNA base pairs and the phenanthroline ring occupies the DNA groove. DNase I cleavage experiments were carried out to investigate the sequence preference of the hybrid ligand and a well resolved footprint was detected at a site encompassing two adjacent 5'-GTC-5-GAC triplets. The sequence preference of the asymmetric molecule is compared to that of the symmetric analogues. (C) 2002 Editions scientifiques et medicales Elsevier SAS. All rights reserved.
YASHIMA, EIJI;AKASHI, MITSURU;MIYAUCHI, NORIYUKI, CHEM. LETT.,(1991) N, C. 1017-1020