Smart DNA Vectors Based on Cyclodextrin Polymers: Compaction and Endosomal Release
作者:Véronique Wintgens、Christian Leborgne、Sonia Baconnais、Virginie Burckbuchler、Eric Le Cam、Daniel Scherman、Antoine Kichler、Catherine Amiel
DOI:10.1007/s11095-011-0560-0
日期:2012.2
Neutral β-cyclodextrin polymers (polyβCD) associated with cationic adamantyl derivatives (Ada) can be used to deliver plasmid DNA into cells. In absence of an endosomolytic agent, transfection efficiency remains low because most complexes are trapped in the endosomal compartment. We asked whether addition of an imidazole-modified Ada can increase efficiency of polyβCD/cationic Ada-based delivery system. We synthesized two adamantyl derivatives: Ada5, which has a spacer arm between the Ada moiety and a bi-cationic polar head group, and Ada6, which presents an imidazole group. Strength of association between polyβCD and Ada derivatives was evaluated by fluorimetric titration. Gel mobility shift assay, zeta potential, and dark field transmission electron microscopy experiments demonstrated the system allowed for efficient DNA compaction. In vitro transfection experiments performed on HepG2 and HEK293 cells revealed the quaternary system polyβCD/Ada5/Ada6/DNA has efficiency comparable to cationic lipid DOTAP. We successfully designed fine-tuned DNA vectors based on cyclodextrin polymers combined with two new adamantyl derivatives, leading to significant transfection associated with low toxicity.
与阳离子金刚烷基衍生物 (Ada) 结合的中性 β-环糊精聚合物 (polyβCD) 可用于将质粒 DNA 递送至细胞中。在没有内体溶解剂的情况下,转染效率仍然很低,因为大多数复合物被困在内体区室中。我们询问添加咪唑修饰的 Ada 是否可以提高基于聚βCD/阳离子 Ada 的递送系统的效率。我们合成了两种金刚烷基衍生物:Ada5(其在 Ada 部分和双阳离子极性头基之间具有间隔臂)和 Ada6(其呈现咪唑基团)。通过荧光滴定法评估聚βCD和Ada衍生物之间的缔合强度。凝胶迁移率变化测定、zeta 电位和暗场透射电子显微镜实验证明该系统可以实现有效的 DNA 压缩。对 HepG2 和 HEK293 细胞进行的体外转染实验表明,四元系统 PolyβCD/Ada5/Ada6/DNA 的效率与阳离子脂质 DOTAP 相当。我们成功地设计了基于环糊精聚合物与两种新型金刚烷基衍生物的微调 DNA 载体,从而实现了低毒性的显着转染。