Cited by 625RNA Interference and Gene DeliveryNanoparticle-Based Drug DeliveryAdvancements in Transdermal Drug Delivery

Biodegradable Lipids Enabling Rapidly Eliminated Lipid Nanoparticles for Systemic Delivery of RNAi Therapeutics

Open access
Maier, Martin A, Jayaraman, Muthusamy, Matsuda, Shigeo, Liu, Ju, Barros, Scott, Querbes, William, Tam, Ying K, Ansell, Steven M +21 more·2013·Molecular Therapy

Abstract

In recent years, RNA interference (RNAi) therapeutics, most notably with lipid nanoparticle-based delivery systems, have advanced into human clinical trials. The results from these early clinical trials suggest that lipid nanoparticles (LNPs), and the novel ionizable lipids that comprise them, will be important materials in this emerging field of medicine. A persistent theme in the use of materials for biomedical applications has been the incorporation of biodegradability as a means to improve biocompatibility and/or to facilitate elimination. Therefore, the aim of this work was to further advance the LNP platform through the development of novel, next-generation lipids that combine the excellent potency of the most advanced lipids currently available with biodegradable functionality. As a representative example of this novel class of biodegradable lipids, the lipid evaluated in this work displays rapid elimination from plasma and tissues, substantially improved tolerability in preclinical studies, while maintaining in vivo potency on par with that of the most advanced lipids currently available.

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Crossref · 10.1038/mt.2013.124

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  • LNPs used in this study are similar in composition to those described previously, which contain an ionizable cationic lipid/phosphatidylcholine/cholesterol/PEG-lipid (50:10:38.5:1.5 mol/mol), encapsulated RNA-to-total lipid ratio of ~0.05 (wt/wt) and a diameter of ~80 nm.

    “LNPs used in this study are similar in composition to those described previously, which contain an ionizable cationic lipid/phosphatidylcholine/cholesterol/PEG-lipid (50:10:38.5:1.5 mol/mol), encapsulated RNA-to-total lipid ratio of ~0.05 (wt/wt) and a diameter of ~80 nm.28,43”

    From Sequence-engineered mRNA without chemical nucleoside modifications enables an effective protein therapy in large animals (2015) · cites this paper as [43]

    The Materials and Methods describe the same four lipid components but give a molar ratio of 55:10:32.5:2.5 and a total-lipid-to-siRNA weight ratio of ~10:1 (siRNA-to-lipid ~0.1), rather than the claimed 50:10:38.5:1.5 and ~0.05. The in vivo efficacy section reports a mean particle diameter of ~60 nm, not ~80 nm. No page numbers are available in our copy. (LLM, conf=0.88)

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  • The Acuitas mRNA delivery platform has been developed from technology shown previously to enable siRNA-dependent hepatic gene silencing across species in rodents, nonhuman primates and humans.

    “The Acuitas mRNA delivery platform has been developed from technology shown previously to enable siRNA-dependent hepatic gene silencing across species in rodents, nonhuman primates and humans.28,43,44”

    From Sequence-engineered mRNA without chemical nucleoside modifications enables an effective protein therapy in large animals (2015) · cites this paper as [43]

    The 'In vivo efficacy evaluation in mouse FVII model' section reports siRNA-dependent gene silencing in mice and rats, and 'Efficacy and rapid elimination properties translate to higher species' reports about 70% silencing of a hepatic gene in nonhuman primates. The paper does not demonstrate hepatic gene silencing in humans or establish that the Acuitas mRNA platform was developed from this technology; its Introduction mentions human clinical trials without making those links. Our copy provides no page numbers for these passages. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Endosomal escape can be increased by optimizing the pKa values of ionizable lipids.

    “Endosomal escape can be increased by optimizing the pKa values of ionizable lipids66,76–78,88,100,140.”

    From Lipid nanoparticles for mRNA delivery (2021) · cites this paper as [76]

  • Biodegradable lipids can be applied to improve the biocompatibility of lipid nanoparticles.

    “To improve the biocompatibility of lipid nanoparticles, biodegradable lipids can be applied76–78,108,179.”

    From Lipid nanoparticles for mRNA delivery (2021) · cites this paper as [76]

  • The delivery efficacy of mRNA could be improved by rational design of lipids through modulation of head groups and hydrophobic tails to increase cellular uptake and endosomal escape of lipid nanoparticle-mRNA formulations.

    “Moreover, the delivery efficacy of mRNA could be improved, for example, by rational design of lipids through modulation of head groups and hydrophobic tails to increase cellular uptake and endosomal escape of lipid nanoparticle–mRNA formulations64,66,76–78,88,97,100,114,140,141.”

    From Lipid nanoparticles for mRNA delivery (2021) · cites this paper as [76]

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Research works printed but not linked: 2

  1. [4]4. Coelho, T (2012). Final Phase I Safety, Pharmacokinetic and Pharmacodynamic Results for ALN-TTR01, a novel rnai therapeutic for the treatment of transthyretin amyloidosis. In: XIII International Symposium on Amyloidosis, 10 May 2012, Groningen, Netherlands.
  2. [15]15. Ratner, BD, Hoffman, AS, Schoen, FJ and Lemons, JE (2013) Biomaterials Science, Third Edition: An Introduction to Materials in Medicine Waltham . Academic Press, Oxford.

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Authors
Maier, M. A., Jayaraman, M., Matsuda, S., Liu, J., Barros, S., Querbes, W., Tam, Y. K., Ansell, S. M., Kumar, V., Qin, J., Zhang, X., Wang, Q., Panesar, S., Hutabarat, R., Carioto, M., Hettinger, J., Kandasamy, P., Butler, D., Rajeev, K. G., Pang, B., Charisse, K., Fitzgerald, K., Mui, B. L., Du, X., Cullis, P., Madden, T. D., Hope, M. J., Manoharan, M., & Akinc, A.
Affiliations
  • Alnylam Pharmaceuticals (United States) (US)
  • University of British Columbia (CA)
Corresponding author
Akinc, Akin
Venue
Molecular Therapy
Publisher
Elsevier BV
Published
2013-08
Volume
21
Issue
8
Pages
1570-1578
ISSN
1525-0016 (ISSN-L)
OpenAlex
W2029397995
Cited by
625
References
17
Citations by year
2026: 63 · 2025: 94 · 2024: 97 · 2023: 78 · 2022: 95 · 2021: 57 · 2020: 35 · 2019: 21 · 2018: 21 · 2017: 15 · 2016: 14 · 2015: 17 · 2014: 15 · 2013: 3
FWCI
7.32
Type
journal article
Language
en
Open access
Locations
  • Molecular Therapy (publishedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
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
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmaceutical Science › Advancements in Transdermal Drug Delivery
Keywords
lipid nanoparticles, RNA interference therapy, biodegradable lipids, ionizable lipids, plasma clearance, biocompatibility, tolerability, lipid nanoparticle formulation
MeSH terms
Animals, Cell Line, Factor VII, Humans, Lipids, Macaca fascicularis, Male, Genetic Therapy, Drug Delivery Systems, Gene Transfer Techniques, Gene Silencing, RNA Interference, RNA, Small Interfering, Mice, Rats, Nanoparticles

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