In vitro and in vivo activity of a new unsymmetrical dinuclear copper complex containing a derivative ligand of 1,4,7-triazacyclononane: catalytic promiscuity of [Cu2(L)Cl3]
作者:Vicente R. de Almeida、Fernando R. Xavier、Renata E. H. M. B. Osório、Luiza M. Bessa、Eduardo L. Schilling、Thiago G. Costa、Tiago Bortolotto、Angélica Cavalett、Frederico A. V. Castro、Felipe Vilhena、Odivaldo C. Alves、Hernán Terenzi、Elis C. A. Eleutherio、Marcos D. Pereira、Wolfgang Haase、Zbigniew Tomkowicz、Bruno Szpoganicz、Adailton J. Bortoluzzi、Ademir Neves
DOI:10.1039/c3dt33046j
日期:——
Here we present the synthesis of the dinuclear complex [CuII2(L)Cl3] (1), where L is the deprotonated form of the 3-[(4,7-diisopropyl-1,4,7-triazacyclononan-1-yl)methyl]-2-hydroxy-5-methylbenzaldehyde ligand. The complex was characterized by single crystal X-ray diffraction, potentiometric titration, mass spectrometry, electrochemical and magnetic measurements, EPR, UV-Vis and IR. Complex 1 is able to increase the hydrolysis rate of the diester bis-(2,4-dinitrophenyl)phosphate (2,4-BDNPP) by a factor of 2700, and also to promote the plasmidial DNA cleavage at pH 6 and to inhibit the formazan chromophore formation in redox processes at pH 7. Using Saccharomyces cerevisiae (BY4741) as a eukaryotic cellular model, we observed that 1 presents reduced cytotoxicity. In addition, treatment of wild-type and mutant cells lacking Cu/Zn-superoxide dismutase (Sod1) and cytoplasmic catalase (Ctt1) with 1 promotes increased survival after H2O2 or menadione (O2˙− generator) stress, indicating that 1 might act as a Sod1 and Ctt1 mimetic. Considered together, these results support considerations regarding the dynamic behaviour of an unsymmetrical dinuclear copper(II) complex in solid state and in aqueous pH-dependent solution.
在这里,我们介绍了双核配合物 [CuII2(L)Cl3] (1) 的合成,其中 L 是 3-[(4,7-二异丙基-1,4,7-三氮杂环壬烷-1-基) 的去质子化形式甲基]-2-羟基-5-甲基苯甲醛配体。该配合物通过单晶 X 射线衍射、电位滴定、质谱、电化学和磁测量、EPR、紫外-可见光和红外进行了表征。复合物 1 能够将二酯双-(2,4-二硝基苯基)磷酸酯 (2,4-BDNPP) 的水解速率提高 2700 倍,并且还能促进 pH 6 下的质粒 DNA 裂解并抑制pH 7 下氧化还原过程中甲臜发色团的形成。使用酿酒酵母 (BY4741) 作为真核细胞模型,我们观察到 1 呈现出降低的细胞毒性。此外,用 1 处理缺乏 Cu/Zn 超氧化物歧化酶 (Sod1) 和细胞质过氧化氢酶 (Ctt1) 的野生型和突变细胞,可促进 H2O2 或甲萘醌(O2˙− 发生器)应激后的存活率增加,表明 1 可能充当Sod1 和 Ctt1 模拟物。综合考虑,这些结果支持了关于固态不对称双核铜 (II) 配合物和 pH 依赖性水溶液中动态行为的考虑。