Synthesis and spectroscopic characterization study of new palladium complexes containing bioactive O,O-chelated ligands: evaluation of the DNA/protein BSA interaction, in vitro antitumoural activity and molecular docking.

Abstract

[Pd{(C,N)-C6H4CH2NH(Et) (Qu)] (2) and [Pd{(C,N)-C6H4CH2NH(Et) (Nar)] (3) (Qu = Quercetin, Nar = Naringin) mononuclear palladium (II) complexes have been synthesized and characterized using elemental analysis, IR and electronic spectroscopy. The interaction of the prepared complexes with calf thymus DNA and bovine serum albumin (BSA), monitored by UV-visible and fluorescence titrations, respectively, have been carried out to better understand the mode of their action under biological conditions. Intercalative binding mode between the complexes and DNA is suggested by the binding constant (Kb) values of 2.5 × 106 and 3.2 × 106 for complexes 2 and 3, respectively. In particular, the in vitro cytotoxicity of the complexes on two cancer cells lines (bladder carcinoma TCC and breast cancer MCF7) showed that the compounds had broad spectrum, anti-cancer activity with low IC50 values and the order of in vitro anticancer activities is consistent with the DNA-binding affinities. In the meantime, the quenching of tryptophan emission with the addition of complexes using BSA as a model protein indicated the protein binding ability. The quenching mechanisms of BSA by the complexes were static processes, according to the results obtained. The competitive binding using Warfarin, Digoxin and Ibuprofen site markers, which contain definite biding sites, demonstrated that the complexes bind to site I on BSA. Ultimately, the binding sites of DNA and BSA with the complexes have been determined by molecular modelling studies.

• Authors: Kazem Karami, Zohreh Mehri Lighvan, Hossein Farrokhpour, Maryam Dehdashti Jahromi, Amir Abbas Momtazi-Borojeni
• Journal: Journal of biomolecular structure & dynamics (J Biomol Struct Dyn) Vol. 36 Issue 13 Pg. 3324-3340 (Oct 2018) ISSN: 1538-0254 [Electronic] England
• PMID: 29019431 (Publication Type: Journal Article)

Chemical References

• Antineoplastic Agents
• Flavanones
• Intercalating Agents
• Ligands
• Serum Albumin, Bovine
• Palladium
• DNA
• Quercetin
• Cathepsin D
• naringin

Topics

• Antineoplastic Agents (chemistry)
• Binding Sites (physiology)
• Breast Neoplasms (drug therapy)
• Cathepsin D (chemistry)
• Cell Line, Tumor
• DNA (chemistry)
• Female
• Flavanones (chemistry)
• Humans
• Intercalating Agents (chemistry)
• Ligands
• MCF-7 Cells
• Molecular Docking Simulation
• Palladium (chemistry)
• Quercetin (chemistry)
• Serum Albumin, Bovine (chemistry)