In this work we have synthesized a new series of cationic carbon nanotubes (CNTs) for siRNA binding. Both single- and multi-walled CNTs have been modified by addition or amidation reaction with short linear polyamine chains including putrescine, spermidine and spermine. All the new conjugates have been characterized with several spectroscopic and microscopic techniques. Their cytotoxic effects have been assessed on human lung carcinoma cell line. Finally, we have analyzed their capacity to bind siRNA towards the development of new carriers for gene silencing applications. The dispersibility properties and the capacity to complex siRNA of the different conjugates were found to be strongly dependent on the position of the functional groups on CNTs (i.e. mainly at the tips following the amidation reaction or on the sidewalls by direct C–C addition).
在这项工作中,我们合成了一系列新型阳离子碳纳米管(CNTs)用于小干扰RNA(siRNA)的结合。通过添加或酰胺化反应,单壁和多壁碳纳米管均被改性,引入了包括
腐胺、
精胺和
亚精胺在内的短链聚胺。所有新型共轭物均通过多种光谱和显微技术进行了表征。它们的细胞毒性在人肺癌癌
细胞系上进行了评估。最后,我们分析了它们结合siRNA的能力,旨在开发用于
基因沉默应用的新型载体。不同共轭物的分散性特性和结合siRNA的能力被发现强烈依赖于功能基团在碳纳米管上的位置(即主要在末端,通过酰胺化反应引入;或在侧壁上,通过直接C–C添加反应引入)。