Monofunctional platinum complexes containing a 4-nitrobenzo-2-oxa-1,3-diazole fluorophore: Distribution in tumour cells
作者:Shengde Wu、Xiaoyong Wang、Chengcheng Zhu、Yajie Song、Jing Wang、Yizhi Li、Zijian Guo
DOI:10.1039/c1dt10555h
日期:——
Two monofunctional platinum(II) complexes, cis-[PtL(NH3)2Cl]NO3 (1) and cis-[PtL′(NH3)2Cl]NO3 (2) L = N-methyl-7-nitro-N-(2-(pyridin-2-yl)ethyl)benzo[c][1,2,5]-oxadiazol-4-amine, L′ = 7-nitro-N-(2-(pyridin-2-yl)ethyl)benzo[c][1,2,5] oxadiazol-4-amine}, have been synthesized and characterized. The X-ray single crystal structure of complex 1 shows that platinum(II) is coordinated in a square-planar geometry with a [PtN3Cl] setting. Fluorescence profiles of the complexes show that complex 1 is more suitable for cellular imaging than complex 2. The cellular uptake and distribution of complex 1 in the human cervical cancer HeLa cells were studied using confocal microscopy. Complex 1 enters the cells slowly, induces cytoplasmic vacuolations, and accumulates in the nucleoli. These results suggest that monofunctional platinum(II) complexes can stimulate tumour cells to undergo a nonapoptotic death process, which is distinct from the apoptosis induced by cisplatin.
顺式-[PtL(NH3)2Cl]NO3 (1) 和顺式-[PtL′(NH3)2Cl]NO3 (2) L = N-甲基-7-硝基-N-(2-(吡啶-2-基)乙基)苯并[c][1、L′=7-硝基-N-(2-(吡啶-2-基)乙基)苯并[c][1,2,5]恶二唑-4-胺}。复合物 1 的 X 射线单晶结构显示,铂(II)以[PtN3Cl]设置的方形平面几何配位。复合物的荧光曲线显示,复合物 1 比复合物 2 更适合用于细胞成像。利用共聚焦显微镜研究了复合物 1 在人类宫颈癌 HeLa 细胞中的细胞摄取和分布情况。复合物 1 缓慢进入细胞,诱导细胞质空泡,并在核小体中聚集。这些结果表明,单功能铂(II)复合物可刺激肿瘤细胞经历非凋亡死亡过程,这与顺铂诱导的凋亡不同。