The modification of siRNA with 3' cholesterol to increase nuclease protection and suppression of native mRNA by select siRNA polyplexes.

The modification of siRNA with 3' cholesterol to increase nuclease protection and suppression of native mRNA by select siRNA polyplexes.
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DOI:
10.1016/j.biomaterials.2010.10.019
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发表时间:
2011-02
期刊:
影响因子:
14
通讯作者:
Vetro, Joseph A.
Vetro, Joseph A.
中科院分区:
工程技术1区
文献类型:
--
作者:
Ambardekar, Vishakha V.;Han, Huai-Yun;Varney, Michelle L.;Vinogradov, Serguei V.;Singh, Rakesh K.;Vetro, Joseph A.

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聚合物-siRNA 复合物(siRNA 复合物)正在积极开发,以改善 siRNA 的治疗应用。然而,许多 siRNA 复合物的主要限制是 mRNA 抑制不足。鉴于用 3' 胆固醇 (chol-siRNA) 修饰 siRNA 的有义链可增加体外和体内游离核酸酶抗性 siRNA 的活性,我们假设 chol-siRNA 的复合可以增加 siRNA 复合物对 mRNA 的抑制。在本研究中,使用三种类型的常规带正电聚合物比较了由 chol-siRNA 或未修饰的 siRNA 形成的自组装复合物的特征和 siRNA 活性:(i) 可生物降解的交联纳米凝胶 (BDNG) (ii) 接枝共聚物 (PEI-PEG) 和 (iii) 线性嵌段共聚物(PLL10-PEG 和 PLL50-PEG)。 Chol-siRNA 不会改变复合物的形成或聚合复合物对肝素 siRNA 置换的抗性,但与未修饰 siRNA 的聚合复合物相比,BDNG、PLL10-PEG 和 PLL50-PEG 聚合复合物增加了核酸酶保护。与相当的 CYPB siRNA 复合物相比,Chol-CYPB siRNA 增加了 BDNG 复合物 (35%) 和 PLL10-PEG 复合物 (69%) 对乳腺微血管内皮细胞 (MVEC) 中天然 CYPB mRNA 的抑制,但对 PEI-PEG 或 PLL50-PEG 复合物没有影响。总体而言,这些结果表明 chol-siRNA 的复合作用通过选择 siRNA 复合物增强了核酸酶保护和 mRNA 抑制。这些结果还表明,聚阳离子嵌段长度是增加乳腺 MVEC 中 PLL-PEG chol-siRNA 复合物对 mRNA 抑制的重要因素。
Polymer-siRNA complexes (siRNA polyplexes) are being actively developed to improve the therapeutic application of siRNA. A major limitation for many siRNA polyplexes, however, is insufficient mRNA suppression. Given that modifying the sense strand of siRNA with 3′ cholesterol (chol-siRNA) increases the activity of free nuclease-resistant siRNA in vitro and in vivo, we hypothesized that complexation of chol-siRNA can increase mRNA suppression by siRNA polyplexes. In this study, the characteristics and siRNA activity of self assembled polyplexes formed with chol-siRNA or unmodified siRNA were compared using three types of conventional, positively charged polymers: (i) biodegradable, cross-linked nanogels (BDNG) (ii) graft copolymers (PEI-PEG), and (iii) linear block copolymers (PLL10-PEG, and PLL50-PEG). Chol-siRNA did not alter complex formation or the resistance of polyplexes to siRNA displacement by heparin but increased nuclease protection by BDNG, PLL10-PEG, and PLL50-PEG polyplexes over polyplexes with unmodified siRNA. Chol-CYPB siRNA increased suppression of native CYPB mRNA in mammary microvascular endothelial cells (MVEC) by BDNG polyplexes (35%) and PLL10-PEG polyplexes (69%) over comparable CYPB siRNA polyplexes but had no effect on PEI-PEG or PLL50-PEG polyplexes. Overall, these results indicate that complexation of chol-siRNA increases nuclease protection and mRNA suppression by select siRNA polyplexes. These results also suggest that polycationic block length is an important factor in increasing mRNA suppression by PLL-PEG chol-siRNA polyplexes in mammary MVEC.
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