Cited by 42Complement system in diseasesImmune Response and InflammationBiomarkers in Disease Mechanisms

Complement Activation by CpG in a Human Whole Blood Loop System: Mechanisms and Immunomodulatory Effects

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Mangsbo, Sara M, Sanchez, Javier, Anger, Kerstin, Lambris, John D, Ekdahl, Kristina Nilsson, Loskog, Angelica S, Nilsson, Bo, Tötterman, Thomas H·2009·The Journal of Immunology

Abstract

Phosphorothioate oligodeoxynucleotides can activate complement, and experimental murine studies have revealed differential effects upon simultaneous TLR stimulation and complement activation compared with either event alone. We set out to investigate the immune stimulatory effects of CpG 2006 in fresh non-anticoagulated human blood with or without presence of active complement. We also sought to elucidate the mechanism behind complement activation upon stimulation with phosphorothioate CpG 2006. In a human blood loop system, both backbone and sequence-specific effects by CpG were counteracted by selective inhibition of C3. Furthermore, DNA backbone-mediated CD40 and CD83 expression on monocytes and sequence-specific IL-6 and TNF production were reduced by complement inhibition. CpG-induced complement activation occurred via either the classical or the alternative pathway and deposits of both IgM and properdin, two activators of complement, were detected on CpG after incubation with EDTA plasma. Quartz crystal microbalance with dissipation monitoring demonstrated alternative pathway convertase build-up onto CpG as a likely pathway to initiate and sustain complement activation. Specific inhibition of C3 suppressed CpG 2006 uptake into monocytes indicating that C3 fragments are involved in CpG internalization. The interplay between complement and TLR9 signaling demonstrated herein warrants further investigation.

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Authors
Mangsbo, S. M., Sanchez, J., Anger, K., Lambris, J. D., Ekdahl, K. N., Loskog, A. S., Nilsson, B., & Tötterman, T. H.
Affiliations
  • Uppsala University (SE)
  • Department of Oncology, Radiology and Clinical Immunology, Division of Clinical Immunology, Uppsala University , Uppsala,
  • University of Pennsylvania (US)
Corresponding author
  • Anger, Kerstin
  • Nilsson, Bo
Venue
The Journal of Immunology
Published
2009-11
Volume
183
Issue
10
Pages
6724-6732
ISSN
  • 0022-1767 (ISSN-L)
  • 1550-6606
OpenAlex
W1808677409
Cited by
42
References
47
Citations by year
2025: 3 · 2024: 2 · 2023: 1 · 2022: 4 · 2021: 2 · 2020: 1 · 2019: 2 · 2018: 1 · 2017: 3 · 2016: 4 · 2015: 5 · 2014: 2 · 2012: 3
FWCI
1.73
Type
journal article
Language
en
Open access
Locations
  • The Journal of Immunology (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institute of General Medical Sciences (GM-62134, R01GM062134)
  • National Institute of Allergy and Infectious Diseases (AI 068730, P01AI068730)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Complement system in diseases
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
  • Life Sciences › Immunology and Microbiology › Immunology › Biomarkers in Disease Mechanisms
Keywords
complement activation, phosphorothioate oligodeoxynucleotides, TLR9 signaling, alternative complement pathway, classical complement pathway, monocytes, CD40, CD83, interleukin-6, TNF-α, properdin, IgM, immunomodulation
MeSH terms
CD83 Antigen, Adjuvants, Immunologic, Complement System Proteins, Complement Activation, Complement Pathway, Alternative, Humans, Immunoglobulin M, Immunoglobulins, Membrane Glycoproteins, Monocytes, Oligodeoxyribonucleotides, Peptides, Cyclic, Properdin, Tumor Necrosis Factor-alpha, Antigens, CD, Interleukin-6, Cytokines, CD40 Antigens, Phosphorothioate Oligonucleotides

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