作者:Jing-Xiao Chen、Hui-Yuan Wang、Chang-Yun Quan、Xiao-Ding Xu、Xian-Zheng Zhang、Ren-Xi Zhuo
DOI:10.1039/c003538f
日期:——
Two kinds of arginine-rich amphiphilic lipopeptides with hydrophobic aliphatic tails (C12GR8GDS, LP1 and C18GR8GDS, LP2) were designed and synthesized as functional gene vectors. With hydrophobic tail modification, these amphiphilic lipopeptides could bind DNA more efficiently and form stable spherical complexes in comparison with the control peptide (AcGR8GDS, P1). Moreover, the size and zeta potential results demonstrated the charge density and stability of the vector/DNA complexes could be improved with the increasing length of the aliphatic tails. In vitro transfection experiments showed that LP1 and LP2 could induce much higher gene expression level (luciferase expression) as compared with P1. Due to the incorporation of arginine-glycine-aspartic acid (RGD) sequences which could be specifically recognized by integrins αυβ3 and αυβ5 over-expressed on cancer cells, these lipopeptides could be specifically recognized by cancer cells, i.e. LP1 and LP2 exhibited relatively higher transfection efficiency in HeLa cell line than that of P2 and P3 without RGD sequence. While the transfection efficiencies of LP2 and P2 were similar in 293T cells. Lipopeptides exhibited very low cell cytotoxicity in both HeLa and 293T cell lines even at high concentration.
设计并合成了两种富含精氨酸且具有疏水脂肪族尾部的两亲脂肽(C12GR8GDS,LP1 和 C18GR8GDS,LP2)作为功能基因载体。与对照肽(AcGR8GDS,P1)相比,经过疏水尾部修饰后,这些两亲脂肽能更有效地结合 DNA 并形成稳定的球形复合物。此外,粒度和 zeta 电位结果表明,载体/DNA 复合物的电荷密度和稳定性可随着脂肪族尾部长度的增加而提高。体外转染实验表明,与 P1 相比,LP1 和 LP2 能诱导更高水平的基因表达(荧光素酶表达)。由于加入了精氨酸-甘氨酸-天冬氨酸(RGD)序列,而这些序列可被癌细胞上过度表达的整合素αυβ3和αυβ5特异性识别,因此这些脂肽可被癌细胞特异性识别,即 LP1 和 LP2 在 HeLa 细胞系中的转染效率相对高于不含 RGD 序列的 P2 和 P3。LP2 和 P2 在 293T 细胞中的转染效率相似。即使在高浓度下,脂肽在 HeLa 和 293T 细胞系中的细胞毒性都很低。