With the success of cisplatin, extensive research resulted in the discovery of carboplatin (a second-generation drug), where the chloride is replaced by 1,1-cyclobutanedicarboxylate. In the current study, we continue our previous work on the binding behavior of [Pd(byp)(H2O)2]2+ with structural features enhancing the interaction with DNA. [Pd(byp)(gly)]+ (1) and [Pd(byp)(CBDCA)] (2), where byp is 2,2´-bipyridine, gly is glycine, and CBDCA is cyclobutane-1,1´-dicarboxylic acid, were synthesized and characterized. The stability constants and stoichiometries of the complexes formed between various DNA units and [Pd(byp)(H2O)2]2+ were investigated. The binding properties of (1) and (2) with CT-DNA were analyzed by UV-vis spectroscopy, viscosity measurements, and cyclic voltammmetry. The (Kb) value for complex (1) (Kb= 4.36x103 M−1 ) , suggests an electrostatic binding together with hydrogen bonding with the negative sites of CT- DNA. The higher (Kb) value of complex (2) (Kb= 2.11x104 M−1) indicates an intercalation binding mode, whereby a ring-opening reaction of CBDCA occurs, followed by the reaction with guanosine 5'-monophosphate to form [(Pdbyp)(CBDCA-O)(5'-GMP)]. The results from UV-Vis spectroscopy, thermal denaturation, viscosity, and cyclic voltammetry data, all reveal electrostatic binding of complex (1) and intercalation mode of complex (2). The antitumor effects of the two complexes were tested. The two complexes display dose-dependent anti-proliferation activity with a prediction of improved efficacy against cancer
随着
顺铂的成功,大量研究导致了
卡铂(第二代药物)的发现,其
氯离子被1,1-
环丁烷二
羧酸根取代。在本研究中,我们继续之前关于[剧(Pd(byp)(
H2O)2]2+与增强与DNA相互作用的结构特征的结合行为的工作。合成并表征了[Pd(byp)(gly)]+(1)和[Pd(byp)(CBDCA)](2),其中byp为
2,2'-联吡啶,gly为甘
氨酸,CBDCA为
环丁烷-1,1'-二
羧酸。研究了各种DNA单元与[剧(Pd(byp)( )2]2+形成的复合物的稳定常数和
化学计量比。通过紫外可见光谱、粘度测量和循环伏安法分析了(1)和(2)与CT-DNA的结合特性。复合物(1)的结合常数(Kb= 4.36x10³ M⁻¹)表明存在静电结合,并与CT-DNA的负位点形成
氢键。复合物(2)的更高Kb值(Kb= 2.11x10⁴ M⁻¹)表明了一种插层结合模式,CBDCA发生开环反应,随后与
鸟苷酸5'-单
磷酸反应形成[(Pdbyp)(CBDCA-O)(5'-GMP)]。来自紫外可见光谱、热变性、粘度和循环伏安法的数据均揭示了复合物(1)的静电结合和复合物(2)的插层模式。测试了这两种复合物的抗肿瘤效果,两种复合物显示出剂量依赖的抗增殖活性,并预测在抗癌方面具有更好的疗效。