1. Synthesis, Oxidant Properties, and Antitumoral Effects of a Heteroleptic Palladium(II) Complex of Curcumin on Human Prostate Cancer Cells
- Author
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Alessandra Valentini, Chiara Stellitano, Daniela Pucci, Sergio Bernardini, M. Ghedini, Alessandra Crispini, Angelo Martino, Giorgio Federici, R. Condello, Giuseppe Rotilio, and Franco Conforti
- Subjects
Male ,Curcumin ,MAP Kinase Kinase 4 ,Poly ADP ribose polymerase ,Antineoplastic Agents ,Apoptosis ,chemistry.chemical_compound ,DU145 ,Cell Line, Tumor ,Drug Discovery ,LNCaP ,Humans ,Cytotoxicity ,Chromatography, High Pressure Liquid ,Cell Proliferation ,Cell growth ,Prostatic Neoplasms ,Oxidants ,Biochemistry ,chemistry ,Cancer cell ,Molecular Medicine ,Spectrophotometry, Ultraviolet ,Reactive Oxygen Species ,Palladium ,DNA Damage ,Signal Transduction - Abstract
A new ionic Pd(II) complex, [(bipy)Pd(Pcurc)][CF(3)SO(3)], 1, with the metal center coordinated to two different chelating ligands, the pure curcumin (Pcurc) and the 4,4'-dinonyl-2,2'-bipyridine (bipy), has been synthesized, fully characterized, and its antitumoral mechanism and oxidant property have been investigated. The Pd(II) complex induces both cell growth inhibition and apoptosis of human prostate cancer cells, (LnCaP, PC3, and DU145) through the production of ROS and JNK phosphorylation associated with GSTp1 down-regulation. ROS production induced by complex 1 treatment activated apoptosis through mitochondrial membrane depolarization in all prostate cancer cells, with up-regulation of Bax and down-regulation of Bcl-2 proteins. In addition, while curcumin determines DNA damage and PARP cleavage, complex 1 does not elicit any activation of PARP enzyme. Taken together, these data validate the significance of curcumin complexation to a metal center and its conjugation to another functionalized bioactive ligand in the apoptosis signal transduction and enhancement of cell death in prostate cancer cell lines and suggest the potential of this design strategy in the improvement of the metal-based drugs cytotoxicity.
- Published
- 2008
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