Mitochondria targeting Photocytotoxic Oxidovanadium( IV) Complexes of Curcumin and ( Acridinyl) dipyridophenazine in Visible Light

Banerjee, Samya and Prasad, Puja and Khan, Imran and Hussain, Akhtar and Kondaiah, Paturu and Chakravarty, Akhil R (2014) Mitochondria targeting Photocytotoxic Oxidovanadium( IV) Complexes of Curcumin and ( Acridinyl) dipyridophenazine in Visible Light. In: ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE, 640 (6, SI). pp. 1195-1204.

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Abstract

Oxidovanadium(IV) complexes, VO(acac)(L)Cl] (1), VO(cur)(L)Cl] (2), and VO(scur)(L)Cl] (3) {acac = acetylacetonate, cur = curcumin monoanion, scur = diglucosylcurcumin monoanion, L = 11-(9-acridinyl)dipyrido3, 2-a:2',3'-c]phenazine (acdppz)}, were prepared and characterized. The complexes are non-electrolytic in DMF and 1:1 electrolytic in aqueous DMF. The one-electron paramagnetic complexes showed a d-d band near 725 nm in aqueous DMF and green emission near 520 nm in aqueous DMSO. The complexes exhibited an irreversible V-IV/V-III redox response near -0.85 V versus SCE in aqueous DMF. The complexes showed good binding strengths to calf thymus DNA (K-b: 3.1x10(5)-9.6x10(5) M-1) and efficient pUC19 DNA photocleavage activity in red light of 705 and 785 nm by singlet oxygen (O-1(2)) pathway. Complexes 1 and 2 exhibited significant photocytotoxicity (IC50: 0.1-1.0 M) in visible light (400-700 nm) with low dark toxicity (IC50: >20 M) in HeLa and HaCaT cells. Complex 3 was cytotoxic in both light and dark. DNA ladder formation experiments indicated cell death via apoptotic pathway. Confocal microscopy done with 1 and 2 revealed primarily cytosolic localization of the complexes with significant presence of the complex in the mitochondria as evidenced from the imaging data using mitotracker red.

Item Type:	Journal Article
Publication:	ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
Publisher:	WILEY-V C H VERLAG GMBH
Additional Information:	copyright for this article belongs to WILEY-V C H VERLAG GMBH, BOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANY
Keywords:	Curcumin; Vanadium; Photocytotoxicity; Apoptosis; Cytosolic localization
Department/Centre:	Division of Biological Sciences > Molecular Reproduction, Development & Genetics Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	27 Jun 2014 05:43
Last Modified:	27 Jun 2014 05:43
URI:	http://eprints.iisc.ac.in/id/eprint/49386

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