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• W4289637123 startingPage "831" @default.
• W4289637123 abstract "Lipid conjugation supports delivery of small interfering RNAs (siRNAs) to extrahepatic tissues, expanding the therapeutic potential of siRNAs beyond liver indications. However, siRNA silencing efficacy in extrahepatic tissues remains inferior to that routinely achieved in liver, partially due to the low rate of endosomal escape following siRNA internalization. Improving siRNA endosomal release into cytoplasm is crucial to improving efficacy of lipid-conjugated siRNAs. Given the ability of ionizable lipids to enhance endosomal escape in a context of lipid nanoparticles (LNP), here, we provide the first report on the effect of an ionizable lipid conjugate on siRNA endosomal escape, tissue distribution, efficacy, and toxicity in vivo. After developing a synthetic route to covalently attach the ionizable lipid, DLin-MC3-DMA, to siRNAs, we demonstrate that DLin-MC3-DMA enhances endosomal escape in cell culture without compromising siRNA efficacy. In mice, DLin-MC3-DMA conjugated siRNAs exhibit a similar overall tissue distribution profile to the similarly hydrophobic cholesterol-conjugated siRNA. However, only DLin-MC3-DMA conjugated siRNAs accumulated in vascular compartments, suggesting an effect of conjugate structure on intratissue distribution. Interestingly, we observed non-specific modulation of gene expression in tissues with high accumulation of DLin-MC3-DMA siRNAs (>20 pmol/mg of tissue) while limited non-specific gene modulation has been observed in tissues with lower siRNA accumulation. These findings suggest modulating the nature of the conjugate is a promising strategy to alter siRNA intratissue and intracellular trafficking. Fine-tuning the nature of the conjugate to optimize endosomal escape while minimizing toxicity will be critical for the progression of therapeutic siRNA applications beyond the liver." @default.
• W4289637123 created "2022-08-03" @default.
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• W4289637123 date "2022-09-01" @default.
• W4289637123 modified "2023-10-15" @default.
• W4289637123 title "Engineered ionizable lipid siRNA conjugates enhance endosomal escape but induce toxicity in vivo" @default.
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• W4289637123 doi "https://doi.org/10.1016/j.jconrel.2022.07.041" @default.
• W4289637123 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/35917865" @default.
• W4289637123 hasPublicationYear "2022" @default.
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