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Flash nanoprecipitation assisted self-assembly of ionizable lipid nanoparticles for nucleic acid delivery.
Nanoscale 2024 March 22
Ionizable lipid nanoparticles (LNPs) have emerged as a powerful tool for the intracellular delivery of nucleic acids. Following the recent success of LNP-based siRNA therapeutics and mRNA vaccines, the use of ionizable lipids for nucleic acid delivery has tremendously increased. Here, we introduce a flash nanoprecipitation (FNP) approach using the confined impingement (CIJ) mixer to stably self-assemble ionizable LNPs. To validate this approach, we employed three clinically relevant LNP formulations containing SM102, ALC0315, and DLin-MC3-DMA as ionizable lipids. FNP-assembled LNPs showed >95% encapsulation efficiency of mRNA and siRNA payloads and particle sizes below 150 nm. SM102 or ALC0315 LNPs demonstrated efficient delivery of mRNA into immune cells in vitro and to lymphoid organs in vivo , whereas Dlin-MC3-DMA LNPs allowed effective intracellular siRNA delivery with great functional ability. The FNP technique could economically produce LNPs in smaller volumes that are highly suitable for the discovery phase.
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