Previously, we reported that cationic nanoparticles (NP) composed of diamine-type cholesteryl-3-carboxamide (OH-Chol, N-(2-(2-hydroxyethylamino)ethyl)cholesteryl-3-carboxamide) and Tween 80 could deliver small interfering RNA (siRNA) with high transfection efficiency into tumor cells. In this study, we synthesized new diamine-type cationic cholesteryl carbamate (OH-C-Chol, cholesteryl (2-((2-hydroxyethyl)amino)ethyl)carbamate) and triamine-type carbamate (OH-NC-Chol, cholesteryl (2-((2-((2-hydroxyethyl)amino)ethyl)amino)ethyl)carbamate), and prepared cationic nanoparticles composed of OH-C-Chol or OH-NC-Chol with Tween 80 (NP-C and NP-NC, respectively), as well as cationic liposomes composed of OH-C-Chol or OH-NC-Chol with 1,2-dioleoyl-sn-glycero-3-phosphoethanolamine (DOPE) (LP-C and LP-NC, respectively) for evaluation of their possible use as siRNA delivery vectors. LP-C and LP-NC/siRNA complexes (lipoplexes) exhibited larger gene silencing effects than NP-C and NP-NC/siRNA complexes (nanoplexes), respectively, in human breast tumor MCF-7 cells, although the NP-C nanoplex showed high association with the cells. In particular, LP-NC lipoplex could induce strong gene suppression, even at a concentration of 5 nM siRNA. From these results, cationic liposomes composed of OH-NC-Chol and DOPE may have potential as gene vectors for siRNA transfection to tumor cells.
此前,我们曾报道过由二胺型
胆固醇-3-甲酰胺(OH-Chol,N-(2-(2-羟乙基)
氨基)乙基
胆固醇-3-甲酰胺)和吐温80组成的阳离子纳米粒子(NP)可以将小干扰RNA(siRNA)高效转染到肿瘤细胞中。本研究合成了新型二胺型阳离子
胆固醇氨基甲酸酯(OH-C-Chol,
胆固醇(2-((2-羟乙基)
氨基)乙基)
氨基甲酸酯)和三胺型
氨基甲酸酯(OH-NC-Chol,
胆固醇(2-((2-((2-羟乙基)
氨基)乙基)
氨基)乙基)
氨基甲酸酯)、的阳离子纳米颗粒(NP-C 和 NP-NC),以及由 OH-C-Chol 或 OH-NC-Chol 与 1,2-dioleoyl-sn-glycero-3-phosphoethanolamine (
DOPE) 组成的阳离子脂质体(LP-C 和 LP-NC),以评估它们作为 siRNA 运送载体的可能性。与 NP-C 和 NP-NC/siRNA 复合物(纳米复合物)相比,LP-C 和 LP-NC/siRNA 复合物(脂质复合物)在人乳腺肿瘤 MCF-7 细胞中分别表现出更大的
基因沉默效应,尽管 NP-C 纳米复合物与细胞的结合率很高。尤其是 LP-NC 脂联复合物,即使 siRNA 浓度为 5 nM,也能诱导强烈的
基因抑制。从这些结果来看,由 OH-NC-Chol 和
DOPE 组成的阳离子脂质体有可能成为 siRNA 转染肿瘤细胞的
基因载体。