کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1316467 1499473 2012 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Efficient DNA cleavage mediated by mononuclear mixed ligand copper(II) phenolate complexes: The role of co-ligand planarity on DNA binding and cleavage and anticancer activity
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Efficient DNA cleavage mediated by mononuclear mixed ligand copper(II) phenolate complexes: The role of co-ligand planarity on DNA binding and cleavage and anticancer activity
چکیده انگلیسی

The new mononuclear copper(II) complexes [Cu(L)(H2O)2]+1 and [Cu(L)(diimine)]+2–6, where LH = 2-[(2-dimethylaminoethylimino)methyl]phenol and diimine = 2,2′-bipyridine (bpy) (2), or 1,10-phenanthroline (phen) (3), or dipyrido[3,2-f:2′,3′-h]quinoxaline (dpq) (4) or dipyrido[3,2-a:2′,3′-c]phenazine (dppz) (5) or 11,12-dimethyldipyrido[3,2-a:2′,3′-c]phenazine (dmdppz) (6), have been isolated and characterized. The X-ray crystal structures of 2 contains the monomeric complex molecule with a trigonal bipyramidal distorted square pyramidal (TBPDSP) coordination geometry, while 4 and 6 with square pyramidal distorted trigonal bipyramidal (SPDTBP) coordination geometry. The amine nitrogen of − NMe2 group of the tridentate primary ligand is located at one of the corners of the square plane in 2 and 6 but in the axial position in 4. The interaction of the complexes with calf thymus DNA has been investigated using UV-visible and fluorescence spectroscopy, and viscosity measurements to understand the effect of diimine co-ligands on the mode and extent of DNA binding. The complexes 4 and 5 interact with calf thymus DNA more strongly than the other complexes through partial intercalation of the extended planar ring of the dpq (4) and dppz (5) co-ligands with the DNA base stack. All the complexes, except 1, effect the double strand DNA cleavage of plasmid DNA and 5 cleaves plasmid DNA in the absence of a reductant at a concentration (40 μM) lower than 4. It is remarkable that all the complexes display cytotoxicity against human breast cancer cell lines (MCF-7) and human cervical epidermoid carcinoma cell lines (ME 180) with potency higher than the currently used chemotherapeutic agent cisplatin and that 5 exhibits cytotoxicity higher than the other complexes.

Both [Cu(L)(dpq)]+ and [Cu(L)(dppz)]+ complexes display stronger DNA binding affinity, prominent DNA cleavage activity without requiring a co-reactant and higher cytotoxicity than the other complexes, due to the enhanced planarity and hydrophobicity of dpq and dppz co-ligands. They induce cell death through apoptosis and necrosis against MCF-7 cancer cell lines.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Inorganic Biochemistry - Volume 114, September 2012, Pages 94–105
نویسندگان
, , , ,