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DNA binding, cleavage and cytotoxicity of a novel dimetallic Fe(III) triaza-cyclononane complex
Araujo, Thaylan Pinheiro; Gandin, Valentina; Kavanagh, Paul; Braude, Jeremy Phillip; Nodari, Luca; Montagner, Diego; Erxleben, Andrea
A novel bimetallic Fe(III) complex with the bis(triaza-cyclononane) ligand 2,6-bis(1,4,7-triazacyclonon-1-ylmethyl)-4-methylphenol (bcmp) is reported. [Fe-2(bcmp(-H))(mu-OH)Cl-2]Cl-2 (2) contains two octahedral Fe(III) centers bound to the two triaza-cyclononane rings of bcmp. The coordination sphere is completed by one chlorine, one bridging phenolate oxygen and one bridging hydroxide group. The complex has been characterized by elemental analysis, Mossbauer spectroscopy, UV-Vis spectroscopy, pH potentiometric titration, ESI mass spectrometry and cyclic voltammetry. The complex hydrolyzes the DNA model bis (2,4-dinitrophenyl) phosphate (BDNPP) with a maximum activity a pH 7. Michaelis-Menten behavior is observed with k(cat) = 3.56 x 10(-4)s(-1) and K-m = 0.56 mM (pH 7.0, 40 degrees C). The interaction of 2 with CT DNA was studied by electronic absorption spectroscopy and gel electrophoresis. Notably, the complex relaxes supercoiled pUC19 DNA into the nicked form at low micromolar concentration (10 mu M) in the presence of an external reducing agent (ascorbic acid). Finally, the in vitro antiproliferative activity of 2 was assessed on a panel of human cancer cell lines and results revealed that the complex exhibited a significant cytotoxic effects in particular versus colon LoVo cancer cells, wih IC50 value 2.5 times lower than that shown by the reference metallodrug cisplatin (3.54 versus 8.53 mu M). (C) 2016 Elsevier B.V. All rights reserved. Financial support from the European Commission (Marie Curie FP7-IEF to D.M.); the University of Padova (Grants 60A04-0443, 60A04-3189 and 60A04-4015/15) and Science Foundation Ireland are gratefully acknowledged. T. P. A. thanks the Brazilian Government and CAPES for a Science Without Border Scholarship. 2018-03-03
Keyword(s): Iron(III); DNA cleavage; DNA binding; Cytotoxicity; Coupled electron transfer; Dinuclear iron(III) complex; Catalytic promiscuity; Synthetic analogs; Binuclear; Ligands
Publication Date:
2017
Type: Journal article
Peer-Reviewed: Yes
Language(s): English
Contributor(s): |~|
Institution: NUI Galway
Publisher(s): Elsevier
File Format(s): application/pdf
First Indexed: 2018-02-28 06:20:25 Last Updated: 2018-02-28 06:20:25