Cited by 85RNA Interference and Gene DeliveryImmune Response and InflammationImmunotherapy and Immune Responses

Contribution of Toll-like Receptor 9 Signaling to the Acute Inflammatory Response to Nonviral Vectors

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Zhao, Hongmei, Hemmi, Hiraoki, Akira, Shizuo, Cheng, Seng H, Scheule, Ronald K, Yew, Nelson S·2004·Molecular Therapy

Abstract

Immunostimulatory CpG motifs have been implicated as a major contributor to the acute inflammatory response associated with nonviral vectors, most prominently seen after systemic delivery of cationic lipid-plasmid DNA (pDNA) complexes. We have shown previously that complexes containing pDNA vectors that have been largely depleted of CpG motifs have significantly reduced acute toxicity when delivered systemically. However, several CpGs remain in these vectors and the toxicity is not negligible, especially at higher doses of complex. To determine the maximal reduction in the acute toxic response that could be achieved by eliminating CpG signaling, we injected cationic lipid-pDNA complexes into transgenic mice that are deficient in Toll-like receptor 9 (TLR9), which is the receptor that recognizes immunostimulatory CpG motifs. We observed significantly decreased adverse hematological changes and liver damage in TLR9(-/-) mice compared to normal mice and increased survival at higher doses of complex. However, a pronounced loss of lymphocytes and platelets was still observed in the TLR9(-/-) mice at higher doses. We also measured the toxicity in normal mice of systemically delivered complexes containing non-CpG oligonucleotides. Although serum transaminase levels were reduced, a loss of lymphocytes and platelets akin to that seen in the TLR9(-/-) mice was observed. Taken together, these findings suggest that signaling through TLR9 contributes to the majority but not all of the toxic responses associated with systemic delivery of cationic lipid-pDNA complexes.

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Crossref · 10.1016/j.ymthe.2003.11.012

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Authors
Zhao, H., Hemmi, H., Akira, S., Cheng, S. H., Scheule, R. K., & Yew, N. S.
Affiliations
Research Institute for Microbial Diseases, The University of Osaka (JP)
Corresponding author
Yew, Nelson S
Venue
Molecular Therapy
Publisher
Elsevier BV
Published
2004-02
Volume
9
Issue
2
Pages
241-248
ISSN
1525-0016 (ISSN-L)
OpenAlex
W2071110366
Cited by
85
References
38
Citations by year
2026: 4 · 2023: 1 · 2022: 3 · 2020: 2 · 2018: 3 · 2017: 2 · 2016: 4 · 2015: 2 · 2013: 5 · 2012: 7
FWCI
2.72
Type
journal article
Language
en
Open access
Locations
  • Molecular Therapy (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Interference and Gene Delivery
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
  • Life Sciences › Immunology and Microbiology › Immunology › Immunotherapy and Immune Responses
Keywords
TLR9, CpG motifs, non-viral gene delivery, acute toxicity, systemic drug delivery, TLR9-deficient mice, lymphocyte depletion, platelet depletion, liver injury, hematologic toxicity, transaminases
MeSH terms
Acute Disease, Animals, Cations, DNA-Binding Proteins, Female, Genetic Vectors, Inflammation, Lipids, Mice, Inbred C57BL, Mice, Inbred Strains, Mice, Transgenic, Oligonucleotides, Receptors, Cell Surface, Signal Transduction, Survival Rate, Sequence Deletion, Mice, Knockout, CpG Islands, Lipid Metabolism, Toll-Like Receptor 9, Mice

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