Chemotherapeutic agents that affect lysosomal functions represent a promising strategy for selective tumor therapy and overcoming drug resistance. In this work, two dinuclear phosphorescent rhenium(I) tricarbonyl complexes (DRe1 and DRe2)...

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The potency of two anticancer iridium-based molecular compounds was greatly enhanced under light irradiation.

Copper complexes are considered as potential candidates for anticancer therapy and medical applications. In this paper, three new Cu(II) complexes, [Cu(IPY)2](ClO4)2·H2O (CuI1), [Cu(IPY)(L-Phe)H2O]ClO4·0.5H2O (CuI2) and [Cu(IPY)(L-Val)H2O]ClO4 (CuI3) (where IPY =...

The application of the antibiotic sulfadiazine (SD) in veterinary medicine has created serious environmental issues due to its high mobility and non-degradability. A novel immobilized cell system has been developed and showed significant SD biodegradation potential in soil.

Two new copper(II) complexes of sparfloxacin (sf), [Cu(Hsf)(HPB)(H2O)](ClO4)2 (1) and [Cu(Hsf)(PBT)(H2O)](ClO4)2 (2) (where HPB = 2-(2’-pyridyl)benzimidazole, PBT = 2-(4’-pyridyl) benzothiazole), have been synthesized and characterized by physicochemical and spectroscopic techniques....

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DNA is an important target for antitumor drugs, hence investigation of the interaction between drug molecules and DNA can help to design targeted DNA antitumor drugs. New ternary copper(II) complex [Cu(Sf)(PyTA)(H 2 O)]•ClO 4 • 3.5H 2 O [Sf＝sparfloxacin, 5-amino-1-cyclopropyl-7-(cis-3,5-dimethyl-1-piperazinyl)-6,8-difluoro-1,4-dihydro-4-oxoquinoline-3-carboxylic acid, PyTA＝2,4-diamino-6-(2'-pyridyl)-1,3,5-triazine] was synthesized and characterized by elemental analyses, molar conductivity measurement and various spectroscopic techniques such as infrared, ultraviolet-visible, and electrospray ionization mass spectra. The interaction of the complex with DNA was investigated using electronic absorption spectroscopy, KI fluorescence quench, viscosity measurement and molecular docking techniques. It was found that the complex could bind to DNA through an intercalation mode being related with the quinoline ring of ligand Sf, and the corresponding binding constant K b is 1.23×10 4 L/mol. Moreover, the antitumor activity of the complex was evaluated using the MTT [3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2-H-tetrazolium bromide] method, revealing that the complex displayed favorable cytotoxic effects [IC 50 ＝(57.0±1.6)～(77.6±1.4) μmol/L] toward cancer cells (A549, Bel-7402 and Eca-109) and less toxic towards normal cells (3T3). Most importantly, the cytotoxic mechanism of the complex towards Eca-109 cells was explored by single cell gel electrophoresis assay, Hoechst 33342 staining, Annexin V-FITC/PI double dye flow cytometry, measurement of mitochondrial membrane potential change, detection of intracellular cytochrome C and Ca 2＋ levels, and test of cell cycle arrest. Single cell gel electrophoresis assay (comet assays) demonstrated that the complex could damage DNA and cause apoptosis. Double staining analysis showed that the complex could induce apoptosis in Eca-109 cells. Cell cycle arrest studies revealed the cell growth arrest at S and G2/M phases. The complex also could induce a reduction in the mitochondrial membrane potential and release of the cytochrome C, and increase the intracellular Ca 2＋ level. The results demonstrated that the complex could induce apoptosis in Eca-109 cells through DNA-binding mitochondrial dysfunctional pathways, which was accompanied by the cell growth arrest at S and G2/M phases and damage of DNA.