Journal
JOURNAL OF BIOLOGICAL INORGANIC CHEMISTRY
Volume 24, Issue 7, Pages 1009-1022Publisher
SPRINGER
DOI: 10.1007/s00775-019-01695-w
Keywords
Dinuclear palladium(II) complexes; Spectroscopic characterization; DNA interaction; BSA interaction; Cytotoxic activity
Funding
- Ministry of Education, Science and Technological Development of the Republic of Serbia [172036, 172011, 175071, 175069, 175103]
- Serbian Academy of Sciences and Arts [01-2019-F65, F128]
- bilateral project with PR China [06/2018]
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Three new dinuclear Pd(II) complexes with general formula [{Pd(en)Cl}(2)(mu-L)](NO3)(2) [L is bridging ligand quinoxaline (Pd1), quinazoline (Pd2) and phthalazine (Pd3)] were synthesized and characterized by elemental microanalyses, UV-Vis, IR and NMR (H-1 and C-13) spectroscopy. The interaction of dinuclear Pd1-Pd3 complexes with calf thymus DNA (CT-DNA) has been monitored by viscosity measurements, UV-Vis and fluorescence emission spectroscopy in aqueous phosphate buffer solution (PBS) at pH 7.40 and 37 degrees C. In addition, these experimental conditions have been applied to investigate the binding affinities of Pd1-Pd3 complexes to the bovine serum albumin (BSA) by fluorescence emission spectroscopy. In vitro antiproliferative and apoptotic activities of the dinuclear Pd(II) complexes have been tested on colorectal and lung cancer cell lines. All tested Pd(II) complexes had lower cytotoxic effect than cisplatin against colorectal cancer cells, but also had similar or even higher cytotoxicity than cisplatin against lung cancer cells. All complexes induced apoptosis of colorectal and lung cancer cells, while the highest antiproliferative effect exerted Pd2 complex. [GRAPHICS]
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