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Molecules 2017, 22(1), 171; doi:10.3390/molecules22010171

In Vitro DNA-Binding, Anti-Oxidant and Anticancer Activity of Indole-2-Carboxylic Acid Dinuclear Copper(II) Complexes

School of Pharmacy, Jining Medical University, 669 Xueyuan Road, Rizhao 276800, Shandong, China
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Author to whom correspondence should be addressed.
Academic Editors: Patrick Gamez, Ana B. Caballero and Derek J. McPhee
Received: 4 December 2016 / Revised: 12 January 2017 / Accepted: 16 January 2017 / Published: 20 January 2017
(This article belongs to the Special Issue Metal Based Drugs: Opportunities and Challenges)
View Full-Text   |   Download PDF [2838 KB, uploaded 20 January 2017]   |  

Abstract

Indole-2-carboxylic acid copper complex (ICA-Cu) was successfully prepared and characterized through elemental analysis, IR, UV-Vis, 1H-NMR, TG analysis, and molar conductance, and its molecular formula was [Cu2(C9H6O2N)4(H2O)2]·2H2O. The binding ability of ICA-Cu to calf thymus DNA (CT-DNA) was examined by fluorescence spectrometry and the viscosity method. The results indicated that, upon the addition of increasing amounts of CT-DNA, the excitation and emission intensity of ICA-Cu decreased obviously and the excitation spectra shifted towards a long wavelength. ICA-Cu could displace ethidium bromide (EB) from the EB-DNA system, making the fluorescence intensity of the EB-DNA system decrease sharply; the quenching constant KSV value was 3.99 × 104 M−1. The emission intensity of the ICA-Cu-DNA system was nearly constant, along with the addition of Na+ in a series of concentrations. The fluorescence of the complex could be protected after the complex interacted with DNA. A viscosity measurement further supported the result that the ICA-Cu complex may interact with DNA in an intercalative binding mode. The antioxidant activities of ICA-Cu were evaluated by a 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay, a hydroxyl radical (OH) scavenging assay, and a 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid (ABTS) assay. The ICA-Cu exhibited the highest inhibitory effects on the ABTS radical (94% inhibition at 60 µM), followed by OH and DPPH radicals (the degrees of inhibition being 71% and 56%, respectively). The in vitro cytotoxicity activity of ICA-Cu against two human breast cancer cell lines, MDA-MB-231 and MCF-7, was investigated by 3-[4,5-dimethyltiazol2-yl]-2.5-diphenyl-tetrazolium bromide (MTT) assay and cellular morphological analysis. The results showed that, upon increasing the concentration of ICA-Cu, an increase was observed in growth-inhibitory activity and the inhibition percentage were greater than 90% at 20 µM in both cell lines. Also, cellular morphological changes in the two cell lines agreed with the cytotoxicity results. View Full-Text
Keywords: DNA-binding; antioxidant; anticancer; indole-2-carboxylicacid; copper(II) complexes DNA-binding; antioxidant; anticancer; indole-2-carboxylicacid; copper(II) complexes
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Wang, X.; Yan, M.; Wang, Q.; Wang, H.; Wang, Z.; Zhao, J.; Li, J.; Zhang, Z. In Vitro DNA-Binding, Anti-Oxidant and Anticancer Activity of Indole-2-Carboxylic Acid Dinuclear Copper(II) Complexes. Molecules 2017, 22, 171.

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