Conjugate Polyplexes with Anti-Invasive Properties and Improved siRNA Delivery In Vivo.

Conjugate Polyplexes with Anti-Invasive Properties and Improved siRNA Delivery In Vivo.
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DOI:
10.1021/acs.bioconjchem.7b00622
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发表时间:
2018-02-21
影响因子:
4.7
通讯作者:
Oupický D
Oupický D
中科院分区:
化学2区
文献类型:
--
作者:
Chen Y;Li J;Oupický D

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本文报道了一种简单的原位巯基-二硫键交换反应制备siRNA-聚阳离子复合物的方法。使用硫醇封端的siRNA和CXCR 4趋化因子受体(rPAMD)的生物可还原的支链聚阳离子抑制剂制备缀合物复合物。与对照常规rPAMD/siRNA复合物相比,rPAMD-SS-siRNA缀合物复合物表现出改善的胶体稳定性和对肝素、血清和生理盐浓度的分解的抗性。用人血清白蛋白包被聚合复合物掩盖了正表面电荷,有助于增强体外基因沉默和提高体内安全性。缀合物复合物在荷瘤小鼠中静脉内注射后显示出改善的体内报告基因沉默。由于缀合物复合物保留了rPAMD抑制CXCR 4和限制癌细胞侵袭的能力,因此开发的系统显示出未来癌症的组合抗转移siRNA疗法的前景。
This study reports on a simple method to prepare siRNA-polycation conjugate polyplexes by in situ thiol-disulfide exchange reaction. The conjugate polyplexes are prepared using thiol-terminated siRNA and a bioreducible branched polycationic inhibitor of the CXCR4 chemokine receptor (rPAMD). The rPAMD-SS-siRNA conjugate polyplexes exhibit improved colloidal stability and resistance against disassembly with heparin, serum, and physiological salt concentrations when compared with control conventional rPAMD/siRNA polyplexes. Coating the polyplexes with human serum albumin masks the positive surface charge and contributes to the enhanced in vitro gene silencing and improved safety in vivo. The conjugate polyplexes display improved in vivo reporter gene silencing following intravenous injection in tumor-bearing mice. Because the conjugate polyplexes retained the ability of rPAMD to inhibit CXCR4 and restrict cancer cell invasion, the developed systems show promise for future combination antimetastatic siRNA therapies of cancer.
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