Synthesis, cytotoxicity and cellular uptake studies of N3 functionalized Re(CO)3 thymidine complexes
作者:Mark D. Bartholomä、Anthony R. Vortherms、Shawn Hillier、John Joyal、John Babich、Robert P. Doyle、Jon Zubieta
DOI:10.1039/c0dt01452d
日期:——
Nucleoside-derived drugs play an important role in the treatment of cancer. Here, we present the synthesis and characterization of an intriguing series of N3 conjugated Re(CO)3 thymidine complexes. The complexes were characterized by NMR spectroscopy and mass spectrometry and their cytotoxicity was assessed against A549 cells. A similar dependence on the spacer length and the toxicity has been found for N3 functionalized complexes as recently reported for their C5′ counterparts. A remarkable cytotoxic complex 22, carrying a dodecylene spacer at position N3 with a bis-quinoline metal chelate moiety, with an IC50 value of 3.4 ± 1.6 μM, has been identified. Addition of a 100-fold excess of thymidine did not statistically reduce the observed cytotoxicity of all complexes. Cellular uptake studies of complex 22 have been performed by fluorescent microscopy, showing that compound 22 was clearly internalized into A549 cells. Temperature dependent uptake studies, blocking experiments with thymidine, and endosomal co-localization suggest that uptake of 22 occurs via passive diffusion and endocytosis.
核苷类药物在癌症治疗中发挥着重要作用。在此,我们介绍了一系列有趣的 N3 共轭 Re(CO)3 胸苷复合物的合成和表征。我们通过核磁共振光谱和质谱对这些复合物进行了表征,并评估了它们对 A549 细胞的细胞毒性。研究发现,N3 功能化复合物的毒性与间隔长度的关系与最近报道的 C5′ 复合物类似。我们发现了一种具有显著细胞毒性的复合物 22,它在 N3 位带有十二烷基间隔物和双喹啉金属螯合物,IC50 值为 3.4 ± 1.6 μM。加入过量 100 倍的胸腺嘧啶并没有在统计学上降低所有复合物的细胞毒性。通过荧光显微镜对复合物 22 进行了细胞摄取研究,结果表明复合物 22 能明显内化到 A549 细胞中。温度依赖性摄取研究、胸腺嘧啶阻断实验以及内体共定位表明,22 的摄取是通过被动扩散和内吞作用进行的。