VEGF siRNA delivery system using arginine-grafted bioreducible poly(disulfide amine).

VEGF siRNA delivery system using arginine-grafted bioreducible poly(disulfide amine).
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DOI:
10.1021/mp800161e
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发表时间:
2009-05
影响因子:
4.9
通讯作者:
Bull DA
Bull DA
中科院分区:
医学2区
文献类型:
--
作者:
Kim SH;Jeong JH;Kim TI;Kim SW;Bull DA

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小干扰RNA(siRNA)能够沉默它们的靶基因,当它们被成功地完整地递送到细胞质中时。增强siRNA定位于细胞质的递送系统可以通过siRNA治疗促进基因沉默。我们描述了一种生物可还原的阳离子聚合物,聚(cystaminebisacrylamide-diaminohexane)(poly(CBA-DAH-R)),一种精氨酸偶联的聚(cystaminebisacrylamide-diaminohexane),作为siRNA载体,用于治疗癌症的基因沉默。在siRNA/聚(CBA-DAH-R)多聚复合物的细胞内摄取后,细胞质的还原环境切割聚合物骨架中的二硫键,导致siRNA/聚(CBA-DAH-R)多聚复合物的解复合和siRNA分子在整个细胞质中的释放。siRNA/聚(CBA-DAH-R)复合物,其证明了精氨酸修饰增加的膜渗透性,具有与siRNA/bPEI复合物相似的细胞摄取水平。然而,VEGF siRNA/聚(CBA-DAH-R)聚合复合物在各种人癌细胞系中比VEGF siRNA/bPEI更大程度地抑制VEGF表达。由VEGF siRNA/聚(CBA-DAH-R)复合物证明的改善的RNAi活性是由于增强的细胞内递送和VEGF siRNA有效定位于细胞质。这些结果表明,VEGF siRNA/poly(CBA-DAH-R)多聚复合物递送系统可用于基于siRNA的癌症治疗方法。
Small interfering RNAs (siRNAs) are able to silence their target genes when they are successfully delivered intact into the cytoplasm. Delivery systems that enhance siRNA localization to the cytoplasm can facilitate gene silencing by siRNA therapeutics. We describe an arginine-conjugated poly(cystaminebisacrylamide-diaminohexane) (poly(CBA-DAH-R)), a bioreducible cationic polymer, as an siRNA carrier for therapeutic gene silencing for cancer. After intracellular uptake of the siRNA/poly(CBA-DAH-R) polyplexes, the reductive environment of the cytoplasm cleaves the disulfide linkages in the polymeric backbone, resulting in decomplexing of the siRNA/poly(CBA-DAH-R) polyplexes and release of siRNA molecules throughout the cytoplasm. The siRNA/poly(CBA-DAH-R) polyplexes, which demonstrate increased membrane permeability with arginine modification, have a similar level of cellular uptake as siRNA/bPEI polyplexes. The VEGF siRNA/poly(CBA-DAH-R) polyplexes, however, inhibit VEGF expression to a greater degree than VEGF siRNA/bPEI in various human cancer cell lines. The improved RNAi activity demonstrated by the VEGF siRNA/poly(CBA-DAH-R) polyplexes is due to enhanced intracellular delivery and effective localization to the cytoplasm of the VEGF siRNAs. These results demonstrate that the VEGF siRNA/poly(CBA-DAH-R) polyplex delivery system may useful for siRNA-based approaches for cancer therapy.
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