Image-based analysis of lipid nanoparticle-mediated siRNA delivery, intracellular trafficking and endosomal escape


Delivery of short interfering RNAs (siRNAs) remains a key challenge in the development of RNA interference (RNAi) therapeutics. A better understanding of the mechanisms of siRNA cellular uptake, intracellular transport and endosomal release could critically contribute to the improvement of delivery methods. Here we monitored the uptake of lipid nanoparticles (LNPs) loaded with traceable siRNAs in different cell types in vitro and in mouse liver by quantitative fluorescence imaging and electron microscopy. We found that LNPs enter cells by both constitutive and inducible pathways in a cell type-specific manner using clathrin-mediated endocytosis as well as macropinocytosis. By directly detecting colloidal-gold particles conjugated to siRNAs, we estimated that escape of siRNAs from endosomes into the cytosol occurs at low efficiency (1-2%) and only during a limited window of time when the LNPs reside in a specific compartment sharing early and late endosomal characteristics. Our results provide insights into LNP-mediated siRNA delivery that can guide development of the next generation of delivery systems for RNAi therapeutics.


Projects: A3.2: Cross-talk of signaling pathways and endocytic machinery in hepato...

Nat. Biotechnol.
Nat. Biotechnol. 31(7): 638-46
23rd Jun 2013

Jerome Gilleron, William Querbes, Anja Zeigerer, Anna Borodovsky, Giovanni Marsico, Undine Schubert, Kevin Manygoats, Sarah Seifert, Cordula Andree, Martin Stöter, Hila Epstein-Barash, Ligang Zhang, Victor Koteliansky, Kevin Fitzgerald, Eugenio Fava, Marc Bickle, Yannis Kalaidzidis, Akin Akinc, Martin Maier, Marino Zerial

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[Jerome Gilleron] [Anja Zeigerer] [Giovanni Marsico] [Sarah Seifert] [Yannis Kalaidzidis]

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Cell, Intercellular and Liver
Views: 1907
  • Created: 15th Jul 2013 at 11:10
  • Last updated: 24th Oct 2013 at 16:14

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