title: DNA binding and photocleavage properties and apoptosis-inducing activities of a ruthenium porphyrin complex [(Py-3')TPP-Ru(phen)2Cl]Cl and its heterometallic derivatives.
abstract: The interactions of a ruthenium porphyrin complex [(Py-3')TPP-Ru(phen)(2)Cl]Cl (phen=1,10-phenanthroline, (Py-3')TPP=5-(3'-pyridyl-10,15,20-triphenylporphyrin) (1) and its heterometallic derivatives, [Ni(Py-3')TPP-Ru(phen)(2)Cl][PF(6)] (2) and [Cu(Py-3')TPP-Ru(phen)(2)Cl][PF(6)] (3), with calf thymus DNA have been investigated by spectroscopic and viscosity measurements in this study. The results showed that these synthetic complexes can bind to double strand helix DNA in groove binding mode, and the intrinsic binding constants of complexes 1, 2 and 3, as calculated according to the decay of the Soret absorption, are (1.35+/-0.5) x10(5)M(-1) (s=4.2), (1.29+/-0.5)x10(5)M(-1) (s=5.6) and (1.22+/-0.5)x10(5)M(-1) (s=6.2) (s is the binding-site size), respectively, which are consistent with those obtained from ethidium bromide-quenching experiments. Further investigations on the photocleavage properties of these complexes on plasmid pBR 322 DNA showed that complexes 1, 2 and 3 could cleave single chain DNA and convert DNA molecules from supercoiled form to the nicked form. As determined by MTT assay, the complexes were also identified as potent antiproliferative agents against A375 human melanoma cells, MCF-7 human breast adrenocarcinoma cells, Colo201 human colon adenocarcinoma cells and HepG2 human liver cancer cells. Complex 1 inhibits the growth of A375 cells through induction of apoptotic cell death and G0/G1 cell cycle arrest. Further investigation on intracellular mechanisms indicated that Complex 1 induced depletion of mitochondrial membrane potential (DeltaPsi(m)) in A375 cells through regulating the expression of pro-survival and pro-apoptotic Bcl-2 family members. Our results suggest that ruthenium porphyrin complexes could be candidates for further evaluation as chemopreventive and chemotherapeutic agents for human cancers.
authors: Department of Chemistry, Jinan University, Guangzhou, PR China. yananliu.jl@gmail.com
authors: Yanan
authors: Y
authors: Liu
authors: Tianfeng
authors: T
authors: Chen
authors: Yum-Shing
authors: YS
authors: Wong
authors: Wen-Jie
authors: WJ
authors: Mei
authors: Xiao-Mei
authors: XM
authors: Huang
authors: Fang
authors: F
authors: Yang
authors: Jie
authors: J
authors: Liu
authors: Wen-Jie
authors: WJ
authors: Zheng
mesh_terms: D017209:Apoptosis; D045744:Cell Line, Tumor; D004247:DNA / Q000737:chemistry* / Q000378:metabolism; D053837:DNA Cleavage; D004354:Drug Screening Assays, Antitumor; D016193:G1 Phase; D006801:Humans; D053078:Membrane Potential, Mitochondrial / Q000187:drug effects; D008665:Metalloporphyrins / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D010782:Photolysis; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000378:metabolism; D016192:Resting Phase, Cell Cycle; D013056:Spectrophotometry, Ultraviolet; D014783:Viscosity
chemical_list: C547322:((Py-3')TPP-Ru(phen)2Cl)Cl; C547324:(Cu(Py-3')TPP-Ru(phen)2Cl)(PF6); C547323:(Ni(Py-3')TPP-Ru(phen)2Cl)(PF6); D008665:Metalloporphyrins; D019253:Proto-Oncogene Proteins c-bcl-2; D004247:DNA