Hydrolytic charge-reversal of PEGylated polyplexes enhances intracellular un-packaging and activity of siRNA.

Hydrolytic charge-reversal of PEGylated polyplexes enhances intracellular un-packaging and activity of siRNA.
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聚乙二醇化复合物的水解电荷反转增强了 siRNA 的细胞内解包装和活性。

DOI:
10.1002/jbm.a.35629
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发表时间:
2016
期刊:
Journal of biomedical materials research. Part A
影响因子:
--
通讯作者:
Duvall,CraigL
Duvall,CraigL
中科院分区:
--
文献类型:
--
作者:
Werfel,ThomasA;Swain,Corban;Nelson,ChristopherE;Kilchrist,KameronV;Evans,BrianC;Miteva,Martina;Duvall,CraigL

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研究了通过将叔胺转化为羧酸来逆转电荷的水解降解纳米复合物(HDG-NP),以与不可降解的类似物(非HDG-NP)相比改善siRNA的细胞内解包装和靶基因沉默。两种NP类型均包含可逆加成-断裂链转移(RAFT)合成的聚(乙二醇)(PEG)冠形成嵌段和用于核酸包装的阳离子嵌段的二嵌段共聚物,其掺入甲基丙烯酸丁酯(BMA)和甲基丙烯酸二甲氨基乙酯(DMAEMA,非HDG-NP)或丙烯酸二甲氨基乙酯(DMAEA,HDG-NP)。在水溶液中24小时后,HDG-NP的尺寸显著减小,并且释放比非HDG-NP显著更多的siRNA(约40%)。虽然HDG-NP和非HDG-NP在高达150 nMsiRNA剂量下具有相当的摄取和细胞毒性,但HDG-NP在体外实现了模型基因沉默酶的显著更高的靶基因沉默。使用高分辨率FRET共聚焦显微镜来监测siRNA的细胞内解包装。非HDG-NP具有比HDG-NP显著更高的FRET效率,表明从HDG-NP递送的siRNA更完全地未包装,因此具有改善的细胞内生物利用度。© 2016 Wiley Periodicals,Inc. J Biomed Mater Res Part A:104A:917-927,2016.
Hydrolytically degrading nano‐polyplexes (HDG‐NPs) that reverse charge through conversion of tertiary amines to carboxylic acids were investigated to improve intracellular un‐packaging of siRNA and target gene silencing compared to a non‐degradable analog (non‐HDG‐NPs). Both NP types comprised reversible addition‐fragmentation chain‐transfer (RAFT) synthesized diblock copolymers of a poly(ethylene glycol) (PEG) corona‐forming block and a cationic block for nucleic acid packaging that incorporated butyl methacrylate (BMA) and either dimethylaminoethyl methacrylate (DMAEMA, non‐HDG‐NPs) or dimethylaminoethyl acrylate (DMAEA, HDG‐NPs). HDG‐NPs decreased significantly in size and released significantly more siRNA (∼40%) than non‐HDG‐NPs after 24 h in aqueous solution. While both HDG‐NPs and non‐HDG‐NPs had comparable uptake and cytotoxicity up to 150 nMsiRNA doses, HDG‐NPs achieved significantly higher target gene silencing of the model gene luciferasein vitro. High resolution FRET confocal microscopy was used to monitor the intracellular un‐packaging of siRNA. Non‐HDG‐NPs had significantly higher FRET efficiency than HDG‐NPs, indicating that siRNA delivered from HDG‐NPs was more fully un‐packaged and therefore had improved intracellular bioavailability. © 2016 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 104A: 917–927, 2016.
延长氯胺酮-甲苯噻嗪静脉输注对兔动脉血 pH 值、血气、平均动脉血压、心率和呼吸频率、直肠温度和反射的影响。
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