期刊
JOURNAL OF INORGANIC BIOCHEMISTRY
卷 103, 期 10, 页码 1386-1394出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jinorgbio.2009.07.013
关键词
Chagas disease; Anti-tumor agent; Vanadium; dppz; DNA; AFM
资金
- CYTED [209RT0380 RIIDFCM]
- FEDER [POCI 2010]
- Fundacao para a Ciencia e Tecnologia (FCT) [PPCDT/QUI/56949/2004, PTDC/QUI-QUI/09881112008, CTQ2005-01834-BQU, BIO2007-6846-C02-01, SFRH/BPD/34695/2007]
- Ministerio de Educacion y Ciencia de Espafia (Spain)
- IST Node that is part of the National Mass Spectroscopy Network (RNEM)
- Fundação para a Ciência e a Tecnologia [SFRH/BPD/34695/2007] Funding Source: FCT
In the search for new metal-based drugs for the treatment of tumoral and parasitic diseases a vanadyl complex, [(VO)-O-IV(SO4)(H2O)(2)(dppz)]center dot 2H(2)O, that includes the bidentate polypyridyl DNA intercalator dipyrido[3,2-a: 2',3'-c]phenazine (dppz), was synthesized, characterized by a combination of techniques, and in vitro evaluated on the human acute promyelocytic leukemia cell line HL-60 and against Dm28c strain epimastigotes of the parasite Trypanosoma cruzi, causative agent of Chagas' disease. EPR spectroscopy suggests a distorted octahedral geometry for the complex with the dppz ligand acting as bidentate, binding through both nitrogen donor atoms in an axial-equatorial mode. An oxo group, two water molecules and a sulphate donor occupy the remainder coordination positions. The complex, as well as the anti-trypanosomal reference drug Nifurtimox, showed IC50 values in the mu M range against T. cruzi Dm28c strain. In addition the complex exhibited excellent in vitro anti-tumor activity against leukemia (HL-60 cell line) comparable to that of cisplatin, inducing cell death by apoptosis with IC50 values in the micromolar range. Data from gel electrophoresis and atomic force microscopy indicate that the complex interacts with DNA, suggesting that its mechanism of action may include DNA as a target. EPR and V-51 NMR experiments were also carried out with aged aerated solutions of the complex to get insight into the stability of the complex in solution and the species responsible for the in vitro activities observed. (C) 2009 Elsevier Inc. All rights reserved.
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