密度泛函法研究抗癌性钌配合物NAMI-A酸性条件下水解机理

用量子化学密度泛函(DFT)方法,研究了第一个进入临床的抗癌性钌配合物[ImH][trans-RuCl4(DMSO)(Im)](NAMI-A)在酸性条件下的第一步水解反应。气相中,在UB3LYP/(LanL2DZ+6-31G(d))水平上对水解反应中各中间体、过渡态进行几何结构和振动频率的计算与分析。随后,用更高级基组,即在UB3LYP/(LanL2DZ(f)+6-311++G(3df,2pd)水平上进行单点能计算,并采用CPCM模型考虑溶剂化效应。通过计算不仅获得了反应中相关的几何和电子结构特征及详细的反应势能面,还得出酸性条件下,NAMI-A中的DMSO基团易于水解,同时伴随着Cl缓慢水解的结论,这与实验结果相吻合。该研究工作可为深入理解抗癌性钌配合物NAMI-A的水解机理提供有意义的理论参考。

Development of NAMI-A-loaded PLGA-mPEG Nanoparticles:Physicochemical Characterization, in vitro Drug Release and in vivo Antitumor Efficacy

NAMI-A[imidazolium trans-tetrachloro(dimethylsulfoxide)imidazoleruthenium(Ⅲ)] shows extraordinary activities against metastatic tumors. However, the hydrolysis of NAMI-A to produce dimethyl sulfoxide(DMSO) could reduce anti-metastatic activity. To enhance the circulation time and the anti-metastatic effect of NAMI-A, NAMI-A-loaded nanoparticles were prepared by the double emulsion method and characterized by scanning electron microscopy for surface morphology, laser light scattering for size and zeta potential for surface charges. Controlled release of NAMI-A was observed in a sustained manner. Compared with free NAMI-A, NAMI-A-loaded nanoparticles exhibited superior antitumor effect by delaying tumor growth in T739 mice. PLGA-mPEG nanoparticles are promising for further studies as drug delivery carriers.

应用QM与ABEEM/MM结合的方法研究NAMI-A的结构性质

应用量子力学(QM)与ABEEM浮动电荷力场(ABEEM/MM)相结合的方法研究了抗癌药物NAMI-A在水溶液中的结构性质.所有的结构优化都是在DFT的B3LYP方法下采用6-31G(d,p)和LanL2DZ基组完成的,没有加入任何限制性条件.结果表明,优化得到的NAMI-A构型受不同环境及方法的影响均有变化.与气相中得到的构型相比,QM/MM迭代优化得到构型要比PCM的构型变化更明显.QM/MM(ABEEM/MM)迭代优化得到的NAMI-A构型比QM/MM(OPLS-AA)的变化要小.总之,溶剂通过极化效应对NAMI-A结构、电荷分布及径向分布函数等性质均有影响,客观地处理极化效应才能正确地反映QM区的性质.