Synthesis, DNA binding, photo-induced DNA cleavage, cytotoxicity and apoptosis studies of copper(II) complexes |
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Authors: | Chen Gong-Jun Qiao Xin Qiao Pei-Qi Xu Guang-Jun Xu Jing-Yuan Tian Jin-Lei Gu Wen Liu Xin Yan Shi-Ping |
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Affiliation: | a Department of Chemistry, Nankai University, Tianjin 300071, PR Chinab College of Pharmacy, Tianjin Medical University, Tianjin 300070, PR Chinac Forth Mil Med Univ, Bethune Mil Med Coll, Shijiazhuang, 050081, PR China |
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Abstract: | Two new Cu(II) complexes, [Cu(acac)(dpq)Cl] () and [Cu(acac)(dppz)Cl] () (acac = acetylacetonate, dpq = dipyrido[3,2-d:20,30-f]quinoxaline, dppz = dipyrido[3,2-a:20,30-c] phenazine), have been synthesized and their DNA binding, photo-induced DNA cleavage activity and cell cytotoxicity are studied. The complexes show good binding propensity to calf thymus DNA in the order: 2(dppz) > 1(dpq). Furthermore, two complexes exhibit efficient DNA cleavage activity on natural light or UV-A (365 nm) irradiation via a mechanistic pathway involving formation of singlet oxygen as the reactive species. The photo-induced DNA cleavage activity of the dppz complex 2 is found to be more efficient than its dpq analogue. In vitro study of the photocytotoxicity of two complexes on HeLa cells indicate that both of them have the potential to act as effective anticancer drugs, with IC50 values of 5.25 ± 0.83 μM (1) and 4.40 ± 0.52 μM (2) in the natural light, and 2.57 ± 0.92 μM (1) and 2.18 ± 0.52 μM (2) in UV-A light. In addition, to detect an apoptotic HeLa body, cells were stained with Hoechst 33342 dye. |
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Keywords: | Crystal structure DNA binding Photo-induced DNA cleavage Cytotoxicity Apoptosis |
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