Journal
JOURNAL OF INORGANIC BIOCHEMISTRY
Volume 105, Issue 12, Pages 1720-1728Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jinorgbio.2011.09.021
Keywords
Cancer; Malaria; Palladium; Platinum
Funding
- Ministerio de Ciencia e Innovacion of Spain [CTQ2009-07021/BQU, CTQ2009-11501]
- AGAUR
- Generalitat de Catalunya [2009-SGR-1111]
- Ministere de l'Enseignement Superieur
- Universite Lille Nord de France
- CNRS
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The study of the reactivity of three 1-(2-dimethylaminoethyl)-1H-pyrazole derivatives of general formula [1-(CH2)(2)NMe2}-3,5-R-2-pzol] {where pzol represents pyrazole and R=H (1a), Me (1b) or Ph (1c)} with [MCl2(DMSO)(2)] (M=Pt or Pd) under different experimental conditions allowed us to isolate and characterize cis-[M{kappa(2)-N,N'-{[1-(CH2)(2)NMe2)-3,5-R-2-Pzol])}Cl-2] {MM=PtPt (2a-2c) or Pd (3a-3c)} and two cyclometallated complexes [M{kappa(3)-C,N,N'-{[1-(CH2)(2)NMe2}-3-(C5H4)-5-Ph-pzol])}Cl] {M=Pt(II) (4c) or Pd(II) (5c)}. Compounds 4c and 5c arise from the orthometallation of the 3-phenyl ring of ligand 1c. Complex 2a has been further characterized by X-ray crystallography. Ligands and complexes were evaluated for their in vitro antimalarial against Plasmodium falciparum and cytotoxic activities against lung (A549) and breast (MDA MB231 and MCF7) cancer cellular lines. Complexes 2a-2c and 5c exhibited only moderate antimalarial activities against two P. falciparum strains (3D7 and W2). Interestingly, cytotoxicity assays revealed that the platinacycle 4c exhibits a higher toxicity than cisplatin in the three human cell lines and that the complex 2a presents a remarkable cytotoxicity and selectivity in lung (IC50=3 mu M) versus breast cancer cell lines (IC50>20 mu M). Thus, complexes 2c and 4c appear to be promising leads, creating a novel family of anticancer agents. Electrophoretic DNA migration studies in presence of the synthesized compounds have been performed, in order to get further insights into their mechanism of action. (C) 2011 Elsevier Inc. All rights reserved.
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