Cited by 1,141RNA Interference and Gene DeliveryDNA and Nucleic Acid ChemistryRNA and protein synthesis mechanisms

Multivalent N -Acetylgalactosamine-Conjugated siRNA Localizes in Hepatocytes and Elicits Robust RNAi-Mediated Gene Silencing

Nair, Jayaprakash K., Willoughby, Jennifer L. S., Chan, Amy, Charisse, Klaus, Alam, Md. Rowshon, Wang, Qianfan, Hoekstra, Menno, Kandasamy, Pachamuthu +17 more·2014·Journal of the American Chemical Society

Abstract

Conjugation of small interfering RNA (siRNA) to an asialoglycoprotein receptor ligand derived from N-acetylgalactosamine (GalNAc) facilitates targeted delivery of the siRNA to hepatocytes in vitro and in vivo. The ligands derived from GalNAc are compatible with solid-phase oligonucleotide synthesis and deprotection conditions, with synthesis yields comparable to those of standard oligonucleotides. Subcutaneous (SC) administration of siRNA-GalNAc conjugates resulted in robust RNAi-mediated gene silencing in liver. Refinement of the siRNA chemistry achieved a 5-fold improvement in efficacy over the parent design in vivo with a median effective dose (ED50) of 1 mg/kg following a single dose. This enabled the SC administration of siRNA-GalNAc conjugates at therapeutically relevant doses and, importantly, at dose volumes of ≤1 mL. Chronic weekly dosing resulted in sustained dose-dependent gene silencing for over 9 months with no adverse effects in rodents. The optimally chemically modified siRNA-GalNAc conjugates are hepatotropic and long-acting and have the potential to treat a wide range of diseases involving liver-expressed genes.

Integrity signals

Registry

Crossref · 10.1021/ja505986a

Cites

38 of 38 references verified0 citation errors · 0 not checkable

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  • GalNAc-siRNA conjugates achieve systemic stability against nucleases, improving pharmacokinetics.

    “Results showed that by conjugating the engineered ASGPR ligand to the chemically modified siRNA molecule, GalNAc-siRNA conjugates could achieve systemic stability against nucleases, which would in turn improve pharmacokinetics.”
  • Single or multiple low-volume subcutaneous injections of GalNAc-siRNA conjugates resulted in effective suppression of the target gene in the liver.

    “Most importantly, single or multiple low-volume subcutaneous injections of these conjugates resulted in effective suppression of the target gene in the liver.[51, 77, 78]”
  • ASGPR is highly expressed on hepatocytes and GalNAc facilitates uptake of its payload into hepatocytes through ASGPR via clathrin-mediated endocytosis.

    “The ASGPR is highly expressed on hepatocytes and GalNAc facilitates the uptake of its payload into hepatocytes through ASGPR via clathrin-mediated endocytosis.[77]”

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Authors
Nair, J. K., Willoughby, J. L. S., Chan, A., Charisse, K., Alam, M. R., Wang, Q., Hoekstra, M., Kandasamy, P., Kel’in, A. V., Milstein, S., Taneja, N., O’Shea, J., Shaikh, S., Zhang, L., van der Sluis, R. J., Jung, M. E., Akinc, A., Hutabarat, R., Kuchimanchi, S., Fitzgerald, K., Zimmermann, T., van Berkel, T. J. C., Maier, M. A., Rajeev, K. G., & Manoharan, M.
Affiliations
  • Alnylam Pharmaceuticals (United States) (US)
  • Alnylam Pharmaceuticals, 300 Third Street, Cambridge, Massachusetts 02142, United States
  • Leiden University (NL)
  • Division of Biopharmaceutics, Leiden Academic Center for Drug Research, 2300 RA Leiden, The Netherlands
  • University of California, Los Angeles (US)
Corresponding author
  • Rajeev, Kallanthottathil G.
  • Manoharan, Muthiah
Venue
Journal of the American Chemical Society
Published
2014-12-01
Volume
136
Issue
49
Pages
16958-16961
ISSN
  • 0002-7863 (ISSN-L)
  • 1520-5126
OpenAlex
W2078890343
Cited by
1,141
References
38
Citations by year
2026: 122 · 2025: 112 · 2024: 98 · 2023: 112 · 2022: 99 · 2021: 126 · 2020: 102 · 2019: 86 · 2018: 93 · 2017: 77 · 2016: 68 · 2015: 46
FWCI
26.09
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of the American Chemical Society (publishedVersion)
  • PubMed (publishedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Interference and Gene Delivery
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA and Nucleic Acid Chemistry
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA and protein synthesis mechanisms
Keywords
N-acetylgalactosamine, asialoglycoprotein receptor, hepatocyte targeting, RNA interference, solid-phase oligonucleotide synthesis, subcutaneous administration, chemically modified siRNA
MeSH terms
Acetylgalactosamine, Animals, Mice, Inbred C57BL, Molecular Structure, Gene Silencing, Hepatocytes, RNA, Small Interfering, Mice

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