Microfluidic Synthesis of Highly Potent Limit-size Lipid Nanoparticles for In Vivo Delivery of siRNA.

Microfluidic Synthesis of Highly Potent Limit-size Lipid Nanoparticles for In Vivo Delivery of siRNA.
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DOI:
10.1038/mtna.2012.28
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发表时间:
2012-08-14
期刊:
Molecular therapy. Nucleic acids
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脂质纳米颗粒(LNP)是用于治疗应用的小干扰RNA(siRNA)的体内递送的领先系统。LNP siRNA系统的配制需要将含有阳离子脂质的溶液与含有siRNA的溶液快速混合。目前的配制程序采用宏观混合方法来产生直径为70 nm或更大的系统,其具有可变的siRNA包封效率、均匀性和再现性。在这里,我们表明,微流控混合技术,允许毫秒混合在纳升规模,可以再现性地产生有限的大小LNP siRNA系统20 nm和更大的siRNA基本上完全封装在一个广泛的条件下,多分散性指数低至0.02。通过微流体混合产生的优化的LNP siRNA系统在小鼠中以10 µg/kg siRNA的剂量水平在肝细胞中实现了50%的靶基因沉默。我们预计,微流体混合,一个精确控制和易于扩展的技术,将成为LNP siRNA递送系统的配方的首选方法。
Lipid nanoparticles (LNP) are the leading systems for in vivo delivery of small interfering RNA (siRNA) for therapeutic applications. Formulation of LNP siRNA systems requires rapid mixing of solutions containing cationic lipid with solutions containing siRNA. Current formulation procedures employ macroscopic mixing processes to produce systems 70-nm diameter or larger that have variable siRNA encapsulation efficiency, homogeneity, and reproducibility. Here, we show that microfluidic mixing techniques, which permit millisecond mixing at the nanoliter scale, can reproducibly generate limit size LNP siRNA systems 20 nm and larger with essentially complete encapsulation of siRNA over a wide range of conditions with polydispersity indexes as low as 0.02. Optimized LNP siRNA systems produced by microfluidic mixing achieved 50% target gene silencing in hepatocytes at a dose level of 10 µg/kg siRNA in mice. We anticipate that microfluidic mixing, a precisely controlled and readily scalable technique, will become the preferred method for formulation of LNP siRNA delivery systems.
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