Unfolding biological properties of a versatile dicopper(II) precursor and its two mononuclear copper(II) derivatives.
Synthesis, inter-conversions and biological study of the dichloro bridged dicopper(II) compound [CuLCl]2 (1) and its two mononuclear derivatives [CuLCl(H2O)]·H2O (2) and [CuLCl(py)] (3) (HL=2-(2-pyridylmethyleneamino)benzenesulfonic acid) are described. The dimeric compound 1 collapses into monomers 2 and 3 in the presence of coordinating solvents, water and pyridine, respectively, and 1 is regenerated upon simple stirring of 2 or 3 in methanol. The reactions of 1 with neutral (present study) and charged (earlier studies) ligands result in monomeric and multimeric compounds, respectively, attesting that it is a versatile dicopper(II) precursor. The anticancer activity of these copper complexes (1-3) was screened against lung (A-549) and breast (MDA-MB-231) human cancer cell lines. The IC50 (half maximal inhibitory concentration) value for one (3) of the compounds suggests preferential cytotoxicity against breast cancer MDA-MB-231 cell line. Furthermore, the IC50 value obtained for complex 3 is found to be almost two-fold times cytotoxic than the standard drug cisplatin. In addition, the underlying possible mechanism of its apoptosis-inducing efficacy in MDA-MB-231 cells has been rationalized by using flow cytometry (FACS) and Hoechst 33342/propidium iodide (PI) fluorescence staining. The stimulation of apoptotic induction for complex 3 has further been affirmed by reactive oxygen species (ROS) generation and mitochondrial aggregations studies.
['Paul|Anup|A|', 'Hazra|Susanta|S|', 'Sharma|Gunjan|G|', 'Guedes da Silva|M Fátima C|MFC|', 'Koch|Biplob|B|', 'Pombeiro|Armando J L|AJL|']
D000072283:A549 Cells D017209:Apoptosis D001943:Breast Neoplasms D056831:Coordination Complexes D003300:Copper D005260:Female D006801:Humans D008928:Mitochondria
Reactive oxygen species Cytotoxicity in vitro Fluorescence activated cell sorting Mitochondrial distribution Sulfonated Schiff base copper(II)