Cited by 711RNA Interference and Gene DeliveryNanoparticle-Based Drug DeliveryRNA and protein synthesis mechanisms

GalNAc-siRNA conjugates: leading the way for delivery of RNAi therapeutics

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Springer, Aaron D., Dowdy, Steven F.·2018·Nucleic Acid Therapeutics

Abstract

Short-interfering RNA (siRNA)-induced RNAi responses have great potential to treat a wide variety of human diseases from cancer to pandemic viral outbreaks to Parkinson's Disease. However, before siRNAs can become drugs, they must overcome a billion years of evolutionary defenses designed to keep invading RNAs on the outside cells from getting to the inside of cells. Not surprisingly, significant effort has been placed in developing a wide array of delivery technologies. Foremost of these has been the development of N-acetylgalactosamine (GalNAc) siRNA conjugates for delivery to liver. Tris-GalNAc binds to the Asialoglycoprotein receptor that is highly expressed on hepatocytes resulting in rapid endocytosis. While the exact mechanism of escape across the endosomal lipid bilayer membrane remains unknown, sufficient amounts of siRNAs enter the cytoplasm to induce robust, target selective RNAi responses in vivo. Multiple GalNAc-siRNA conjugate clinical trials, including two phase III trials, are currently underway by three biotech companies to treat a wide variety of diseases. GalNAc-siRNA conjugates are a simple solution to the siRNA delivery problem for liver hepatocytes and have shown the RNAi (and antisense oligonucleotide) field the path forward for targeting other tissue types.

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Crossref · 10.1089/nat.2018.0736

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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]”

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  1. Alnylam. (2018). Alnylam presents new clinical results from the Apollo Phase 3 study of Patisiran at the 16th international symposium on amyloidosis, http://investors .alnylam.com/news-releases/news-release-details/alnylam- presents-new-clinical-results-apollo-phase-3-study Accessed on April 23, 2018.

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Authors
Springer, A. D., & Dowdy, S. F.
Affiliations
University of California San Diego (US)
Venue
Nucleic Acid Therapeutics
Published
2018-06
Volume
28
Issue
3
Pages
109-118
ISSN
  • 2159-3337 (ISSN-L)
  • 2159-3345
OpenAlex
W2803566305
Cited by
711
References
103
Citations by year
2026: 104 · 2025: 113 · 2024: 118 · 2023: 99 · 2022: 99 · 2021: 90 · 2020: 50 · 2019: 35 · 2018: 2
FWCI
4.34
Type
journal article
Language
en
Open access
Locations
  • Nucleic Acid Therapeutics (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health
  • National Eye Institute (R21EY027507)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Interference and Gene Delivery
  • Physical Sciences › Materials Science › Biomaterials › Nanoparticle-Based Drug Delivery
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA and protein synthesis mechanisms
Keywords
siRNA delivery, RNAi therapeutics, N-acetylgalactosamine, asialoglycoprotein receptor, hepatocyte targeting, endocytosis, endosomal escape, antisense oligonucleotides, clinical trials
MeSH terms
Acetylgalactosamine, Clinical Trials as Topic, Endocytosis, Glycoconjugates, Liver, Neoplasms, Parkinson Disease, Endosomes, Virus Diseases, Gene Transfer Techniques, Hepatocytes, RNA, Small Interfering, Asialoglycoprotein Receptor, Nanoparticles

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