Cited by 1,261RNA Interference and Gene DeliveryNanoparticle-Based Drug DeliveryInhalation and Respiratory Drug Delivery

Targeted delivery of RNAi therapeutics with endogenous and exogenous ligand-based mechanisms

Open access
Akinc, Akin, Querbes, William, De, Soma, Qin, June, Frank-Kamenetsky, Maria, Jayaprakash, K. Narayanannair, Jayaraman, Muthusamy, Rajeev, Kallanthottathil G +17 more·2010·Molecular Therapy

Abstract

Lipid nanoparticles (LNPs) have proven to be highly efficient carriers of short-interfering RNAs (siRNAs) to hepatocytes in vivo; however, the precise mechanism by which this efficient delivery occurs has yet to be elucidated. We found that apolipoprotein E (apoE), which plays a major role in the clearance and hepatocellular uptake of physiological lipoproteins, also acts as an endogenous targeting ligand for ionizable LNPs (iLNPs), but not cationic LNPs (cLNPs). The role of apoE was investigated using both in vitro studies employing recombinant apoE and in vivo studies in wild-type and apoE(-/-) mice. Receptor dependence was explored in vitro and in vivo using low-density lipoprotein receptor (LDLR(-/-))-deficient mice. As an alternative to endogenous apoE-based targeting, we developed a targeting approach using an exogenous ligand containing a multivalent N-acetylgalactosamine (GalNAc)-cluster, which binds with high affinity to the asialoglycoprotein receptor (ASGPR) expressed on hepatocytes. Both apoE-based endogenous and GalNAc-based exogenous targeting appear to be highly effective strategies for the delivery of iLNPs to liver.

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Crossref · 10.1038/mt.2010.85

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  • At blood pH, LNPs exhibit a net neutral surface charge but become positively charged in acidified endosomes following ApoE-mediated endocytosis by hepatocytes in vivo, resulting in endosome disruption and release of mRNA into the cytoplasm.

    “At blood pH, LNPs exhibit a net neutral surface charge but become positively charged in acidified endosomes following ApoE-mediated endocytosis by hepatocytes in vivo, resulting in endosome disruption and release of mRNA into the cytoplasm.28,41,45”
  • LNP systems with this lipid composition can silence target genes in hepatocytes following IV injection at dose levels as low as 0.01 mg siRNA/kg body weight in an apolipoprotein E (ApoE)-dependent fashion.

    “Previous work has shown that LNP systems with this lipid composition can silence target genes in hepatocytes following IV injection at dose levels as low as 0.01 mg siRNA/kg body weight8,9 in an apolipoprotein E (ApoE)–dependent fashion.10”
  • The ability of LNP-siRNA systems containing related ionizable cationic lipids to induce hepatocyte gene knockdown in vivo is ApoE dependent.

    “Detailed studies have shown that the ability of LNP-siRNA systems containing related ionizable cationic lipids to induce hepatocyte gene knockdown in vivo is ApoE dependent.10”
  • In ApoE knockout mice, LNP-siRNA gene silencing activity is inhibited in hepatocytes and can be reestablished by incubating the LNPs with ApoE before IV administration.

    “In ApoE knockout mice, LNP-siRNA gene silencing activity is inhibited in hepatocytes and can be reestablished by incubating the LNPs with ApoE before IV administration.”
  • Upon intravenous administration, neutrally charged LNPs are strongly enriched with apolipoprotein E, leading to enhanced uptake by hepatocytes through LDL receptor-mediated endocytosis.

    “Upon intravenous administration, Akinc et al. found that the surface of neutrally-charged LNPs is strongly enriched with apolipoprotein E (ApoE), which leads to enhanced uptake by hepatocytes through low density lipoprotein (LDL) receptor-mediated endocytosis [40]”

    From The dawn of mRNA vaccines: the COVID-19 case (2021) · cites this paper as [40]

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Authors
Akinc, A., Querbes, W., De, S., Qin, J., Frank-Kamenetsky, M., Jayaprakash, K. N., Jayaraman, M., Rajeev, K. G., Cantley, W. L., Dorkin, J. R., Butler, J. S., Qin, L., Racie, T., Sprague, A., Fava, E., Zeigerer, A., Hope, M. J., Zerial, M., Sah, D. W., Fitzgerald, K., Tracy, M. A., Manoharan, M., Koteliansky, V., Fougerolles, A. D., & Maier, M. A.
Affiliations
  • Alnylam Pharmaceuticals (United States) (US)
  • Max Planck Institute of Molecular Cell Biology and Genetics (DE)
Corresponding author
Akinc, Akin
Venue
Molecular Therapy
Publisher
Elsevier BV
Published
2010-07
Volume
18
Issue
7
Pages
1357-1364
ISSN
1525-0016 (ISSN-L)
OpenAlex
W2143743183
Cited by
1,261
References
32
Citations by year
2026: 147 · 2025: 141 · 2024: 164 · 2023: 129 · 2022: 120 · 2021: 83 · 2020: 72 · 2019: 63 · 2018: 39 · 2017: 41 · 2016: 47 · 2015: 46 · 2014: 51 · 2013: 46 · 2012: 44
FWCI
15.10
Type
journal article
Language
en
Open access
Locations
  • Molecular Therapy (publishedVersion, cc-by-nc-nd)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Max Planck Institute for Plasma Physics (submittedVersion)
  • MPG.PuRe (Max Planck Society) (submittedVersion)
Funders
Alnylam Pharmaceuticals
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Interference and Gene Delivery
  • Physical Sciences › Materials Science › Biomaterials › Nanoparticle-Based Drug Delivery
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Inhalation and Respiratory Drug Delivery
Keywords
RNAi therapeutics, lipid nanoparticles, apolipoprotein E, N-acetylgalactosamine, asialoglycoprotein receptor, hepatocyte targeting, LDL receptor, nanoparticle clearance
MeSH terms
Animals, Apolipoproteins E, Female, HeLa Cells, Humans, Ligands, Mice, Inbred C57BL, Receptors, LDL, Hepatocytes, RNA Interference, Asialoglycoprotein Receptor, Mice, Nanoparticles

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