Journal
JOURNAL OF INORGANIC BIOCHEMISTRY
Volume 127, Issue -, Pages 150-160Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jinorgbio.2013.02.010
Keywords
Oxidovanadium(IV) complexes; Dioxidovanadium(V) complexes; Salicylaldehyde semicarbazones; Antitrypanosomal 2,2 '-bipyridine; dipyrido[3,2-a: 2 ',3 '-c]; phenazine
Funding
- RIIDFCM YTED [209RT0380]
- Fundacao para a Ciencia e Tecnologia (FCT, Portugal), [PEst-OE/QUI/UI0100/2011, CIENCIA2007]
- Portuguese NMR
- CONICET [PIP 1529]
- ANPCyT, Argentina [PME06 2804, PICT06 2315]
- CONICET
- Agencia Nacional de Investigacion e Innovacion (ANII) [DCI-ALA/2007/19.040]
- Ministerio de Economia y Competitividad (MINECO) [CTQ2011-27929-C02-01]
- Agencia Nacional de Investigacion e Innovacion (ANII, Uruguay) [iINLX_2010_2_3105]
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As a contribution to the identification of the relevant species for biological activity and the understanding of structure-activity relationships of [(VO)-O-IV(L-2H)(NN)] antitrypanosomal complexes (NN is a bidentate polypyridyl DNA intercalator; L is a tridentate salicylaldehyde semicarbazone derivative), new [(VO2)-O-V(L-2H)] complexes and [(VO)-O-IV(L-2H)(NN)] complexes including bipy or dppz (dipyrido[3,2-a: 2',3'-c]phenazine) co-ligands are prepared and characterized in the solid state and in solution. Their activity is evaluated on Trypanosoma cruzi. The lipophilicity, as structural descriptor related to bioactivity, of the whole [(VO)-O-IV(L-2H)(NN)] series is determined. Furthermore, the antiproliferative effect of those new compounds showing activity against T. cruzi is evaluated on the genetically related parasite T. brucei with the aim to develop broad spectrum agents. The new [WO (L-2H)(dppz)] complexes are about ten to fifteen times more toxic to T. cruzi than the bipy analogues and show quite good in vitro activity on T. brucei brucei. They are shown to interact with DNA, suggesting that this biomolecule may be the parasite target. The stability of the (VO)-O-IV-complexes in solution is accessed by several techniques. Globally the data suggest that the relevant species for biological activity are the [(VO)-O-IV(L-2H)(NN)] compounds, their order of activity being dependent on the NN nature, but not much on the substitution on the salicylaldehyde semicarbazone moiety. A parabolic relationship between biological response and lipophilicity (determined as R-M = log [(1 / R-f) -1] by a TLC method) is obtained. From this correlation an optimum R-M value, close to 1.44, was found, which may be used as design guide for future development of antitrypanosomal compounds. (C) 2013 Elsevier Inc. All rights reserved.
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