Phenyl carbohydrazone conjugated 2-oxoindoline as a new scaffold that augments the DNA and BSA binding affinity and anti-proliferative activity of a 1,10-phenanthroline based copper(II) complex

Sellamuthu Anbu, Anup Paul, Rajendran Ravishankaran, M. Fátima C. Guedes da Silva, Anjali A. Karande, Armando J. L. Pombeiro

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A new type of copper(II) complex, [CuL(phen)2](NO3) (CuIP), where L ((E)-N′-(2-oxoindolin-3-ylidene)benzohydrazide) is a N donor ligand and phen is the N, N-donor heterocyclic 1,10-phenanthroline, has been synthesized. The phenyl carbohydrazone conjugated isatin-based ligand L and CuIP were characterized by elemental analysis, infrared, UV–Vis, 1H and 13C NMR and ESI-mass spectral data, as well as single-crystal X-ray diffraction. The interaction of calf thymus DNA (CT DNA) with L and CuIP has been investigated by absorption, fluorescence and viscosity titration methods. The complex CuIP displays better binding affinity than the ligand L. The observed DNA binding constant (Kb = 4.15(±0.18) × 105 M−1) and binding site size (s = 0.19), viscosity data together with molecular docking studies of CuIP suggest groove binding and/or a partial intercalative mode of binding to CT DNA. In addition, CuIP shows good binding propensity to the bovine serum albumin (BSA) protein, giving a KBSA value of 1.25(±0.24) × 106 M−1. In addition, the docking studies on DNA and human serum albumin (HSA) CuIP interactions are consistent with the consequence of binding experiments. The in vitro anti-proliferative study establishes the anticancer potency of the CuIP against the human cervical (HeLa) and breast (MCF7) cancer cells; noncancer breast epithelial (MCF10a) cells have also been investigated. CuIP shows better cytotoxicity and sensitivity towards cancer cells over noncancer ones than L under identical conditions, with the appearance of apoptotic bodies.
Original languageEnglish
Pages (from-to)183-193
Number of pages11
JournalInorganica Chimica Acta
Issue numberPart B
Early online date21 Jul 2014
Publication statusPublished - 1 Nov 2014

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