作者:Qin-Fang Zhang、Bing Wang、Dong-Xiao Yin、Ji Zhang、Wan-Xia Wu、Qing-Ying Yu、Xiao-Qi Yu
DOI:10.1039/c4ra11094c
日期:——
A series of linear cationic polymers were synthesized by the ring-opening polymerization between diglycidyl ethers and 1-Cbz-1,4,7-triazacyclononane (TACN). Besides the good pH buffering capacity in endosome pH range caused by TACN, these polymers have evenly distributed hydroxyl groups, which may benefit not only the water solubility but also their biocompatibility and serum tolerance. The polymers could condense DNA into nanoparticles with appropriate sizes and zeta-potentials. Cytotoxicity assays reveal that most of the polyplexes formed from title polymers have lower cytotoxicity than those derived from PEI. In vitro transfection assays show that some of these materials have higher transfection efficiency than bPEI, especially in tumor cells with the presence of serum. Flow cytometry and confocal microscopy were applied to further confirm their good serum tolerance. The structure–activity relationship of such type of polymeric vectors was also discussed. Results suggest that the ring-opening polymerization may be an effective synthetic approach toward gene delivery materials with high biological activity.
通过二缩水甘油醚与 1-苄氧羰基-1,4,7-三氮杂环壬烷(TACN)之间的开环聚合反应,合成了一系列线性阳离子聚合物。除了 TACN 在内质体 pH 值范围内具有良好的 pH 缓冲能力外,这些聚合物还具有均匀分布的羟基,这不仅有利于其水溶性,还有利于其生物相容性和血清耐受性。这些聚合物能将 DNA 凝聚成具有适当尺寸和 zeta 电位的纳米颗粒。细胞毒性试验表明,大多数由标题聚合物形成的多聚体的细胞毒性低于由 PEI 制成的多聚体。体外转染试验表明,其中一些材料的转染效率高于 bPEI,尤其是在有血清存在的肿瘤细胞中。流式细胞仪和共聚焦显微镜的应用进一步证实了它们良好的血清耐受性。此外,还讨论了这类聚合物载体的结构-活性关系。研究结果表明,开环聚合可能是获得高生物活性基因递送材料的一种有效合成方法。