Cited by 382Nanoparticle-Based Drug DeliveryImmunotherapy and Immune ResponsesRNA Interference and Gene Delivery

PEGylated liposomes elicit an anti-PEG IgM response in a T cell-independent manner

Ishida, Tatsuhiro, Wang, XinYu, Shimizu, Taro, Nawata, Kosuke, Kiwada, Hiroshi·2007·Journal of Controlled Release

Abstract

We recently reported that intravenous injections of "empty" PEGylated liposomes without encapsulated or surface coupled proteins elicit a PEG-specific IgM response in rats. In the present study, simultaneous weak anti-PEG IgG and strong anti-PEG IgM responses were detected following intravenous injections of "empty" PEGylated liposomes. The pattern of immune response appears to differ from the classic primary response against T cell-dependent (TD) antigens. The anti-PEG IgM response was detected in T-cell deficient nude BALB/c mice following intravenous injection of "empty" PEGylated liposomes, suggesting that "empty" PEGylated liposomes initiate the immune response against PEG in a T cell-independent manner. In vitro splenic lymphocytes-proliferation assay indicated that TNP-LPS, a typical type 1 T cell-independent (TI) antigen (TI-1 antigen), significantly primed the proliferation, while TNP-Ficoll, a typical type 2 TI antigen (TI-2 antigen), and "empty" PEGylated liposomes did not prime any proliferation under these experimental conditions. In addition, in splenic marginal zone (MZ) B-cell-depleted rats, the anti-PEG IgM response was diminished, while the immune reactions against TNP-BSA (a TD antigen) and TNP-LPS (TI-1 antigen) were not diminished. These results demonstrate that "empty" PEGylated liposomes may promote the immune response against PEG as a result of priming the activation of MZ B cells, as TI-2 antigen promotes a specific IgM response. In conclusion, although the mechanistic details behind the immune reaction against "empty" PEGylated liposomes are not yet clear, the liposomes elicit an anti-PEG IgM response in a T cell-independent manner and appear to be a TI-2 antigen, and splenic MZ B cells may be essential for the immune response against "empty" PEGylated liposomes.

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Crossref · 10.1016/j.jconrel.2007.05.015

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Authors
Ishida, T., Wang, X., Shimizu, T., Nawata, K., & Kiwada, H.
Affiliations
Tokushima University (JP)
Corresponding author
Kiwada, Hiroshi
Venue
Journal of Controlled Release
Publisher
Elsevier BV
Published
2007-10
Volume
122
Issue
3
Pages
349-355
ISSN
0168-3659 (ISSN-L)
OpenAlex
W2087167636
Cited by
382
References
45
Citations by year
2026: 13 · 2025: 20 · 2024: 14 · 2023: 28 · 2022: 20 · 2021: 23 · 2020: 25 · 2019: 13 · 2018: 32 · 2017: 22 · 2016: 24 · 2015: 29 · 2014: 24 · 2013: 29 · 2012: 25
FWCI
4.91
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Controlled Release (publishedVersion)
  • PubMed (publishedVersion)
Funders
Kao Foundation for Arts and Sciences
Topics
  • Physical Sciences › Materials Science › Biomaterials › Nanoparticle-Based Drug Delivery
  • Life Sciences › Immunology and Microbiology › Immunology › Immunotherapy and Immune Responses
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Interference and Gene Delivery
Keywords
PEGylated liposomes, T cell-independent immunity, marginal zone B cells, nude mice, TNP-LPS, TNP-Ficoll, splenocyte proliferation, intravenous injection
MeSH terms
Animals, Antigens, T-Independent, Cyclophosphamide, Immunoglobulin G, Immunoglobulin M, Injections, Intravenous, Liposomes, Male, Mice, Inbred BALB C, Mice, Nude, Polyethylene Glycols, Spleen, T-Lymphocytes, Rats, Wistar, Cell Proliferation, Mice, Rats

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