DNA photocleavage and anticancer activity of terpyridine copper(II) complexes having phenanthroline bases

Roy, Sovan and Saha, Sounik and Majumdar, Ritankar and Dighe, Rajan R and Chakravarty, Akhil R (2010) DNA photocleavage and anticancer activity of terpyridine copper(II) complexes having phenanthroline bases. In: Polyhedron, 29 (14). pp. 2787-2794.

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Abstract

Copper(II) complexes Cu(ph-tpy)(B)](ClO4) (1-3), where ph-tpy is (4'-phenyl)-2,2':6',2 `'-terpyridine and B is N,N-donor phenanthroline base, viz. 1,10-phenanthroline (phen, 1), dipyridoquinoxaline (dpq, 2), and dipyridophenazine (dppz, 3), were prepared and characterized from analytical and spectral data. Complex 1, characterized by X-ray crystallography, shows a distorted square-pyramidal (4 + 1) CuN5 coordination geometry having the tridentate ph-tpy ligand at the basal plane and bidentate phen bound to the axial-equatorial sites. The complexes display a d-d band near 650 nm in aqueous DMF. The complexes are avid binders to calf thymus DNA giving the binding order: 3 (dppz) > 2 (dpq) > 1 (phen). The dpq and dppz complexes show photo-induced DNA cleavage activity in red light via photo-redox pathway forming hydroxyl radicals. The cytotoxicity of the dppz complex 3 was studied by MTT assay in HeLa cancer cells. The IC50 values are 3.7 and 12.4 mu M in visible light of 400-700 nm and dark, respectively. (C) 2010 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	Polyhedron
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	Copper(II) complex; DNA binding; DNA photocleavage; Cytotoxicity; Phenanthroline bases; Crystal structure.
Department/Centre:	Division of Biological Sciences > Molecular Reproduction, Development & Genetics Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	18 Oct 2010 10:03
Last Modified:	18 Oct 2010 10:03
URI:	http://eprints.iisc.ac.in/id/eprint/33264

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