Cited by 116Immunotherapy and Immune ResponsesImmune Response and InflammationComplement system in diseases

Dendritic cell function in allostimulation is modulated by C5aR signaling

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Peng, Qi, Li, Ke, Wang, Naiyin, Li, Qijun, Asgari, Elham, Lu, Bao, Woodruff, Trent M, Sacks, Steven H +1 more·2009·The Journal of Immunology

Abstract

Regulation of T cell immunity by C5a has been suggested from recent studies. However, the underlying mechanisms, particularly the involved cells and biochemical basis, are not well defined. In this study, the direct modulation of dendritic cell (DC) activation and its function in T cell stimulation by C5a-C5aR interaction and the involved signaling pathways were investigated. We show that DCs from C5aR−/− mice and normal DCs treated with C5aR antagonist have less-activated phenotype characterized with increased IL-10 and decreased IL-12p70 production in response to LPS stimulation, lowered surface expression of MHC class II, B7.2, and consequently have reduced capacity to stimulate allospecific T cells. Conversely, C5a stimulation up-regulates DC activation and its function in allostimulation. Furthermore, stimulation of C5aR mediates the inhibition of cAMP production and protein kinase A activity and is involved in activation of PI3K/AKT and NF-κB signaling in DCs. These results demonstrate that C5a acts directly on C5aR expressed on DCs resulting in the cell activation and subsequently enhances its capacity for allospecific T cell stimulation. It also suggests that NF-κB signaling induced by down-regulation of cAMP/ protein kinase A pathway and up-regulation of PI3K/AKT pathway following C5a stimulation may contribute to up-regulation of DC function.

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Authors
Peng, Q., Li, K., Wang, N., Li, Q., Asgari, E., Lu, B., Woodruff, T. M., Sacks, S. H., & Zhou, W.
Affiliations
  • Guy's Hospital (GB)
  • Harvard University (US)
  • The University of Queensland (AU)
Venue
The Journal of Immunology
Published
2009-11
Volume
183
Issue
10
Pages
6058-6068
ISSN
  • 0022-1767 (ISSN-L)
  • 1550-6606
OpenAlex
W1828479613
Cited by
116
References
41
Citations by year
2026: 3 · 2025: 5 · 2024: 3 · 2023: 6 · 2021: 2 · 2020: 5 · 2019: 5 · 2018: 3 · 2017: 13 · 2016: 8 · 2015: 8 · 2014: 6 · 2013: 13 · 2012: 16
FWCI
5.18
Type
journal article
Language
en
Open access
Locations
  • The Journal of Immunology (publishedVersion)
  • PubMed (publishedVersion)
  • Research Portal (King's College London) (submittedVersion)
Funders
Medical Research Council
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Immunotherapy and Immune Responses
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
  • Life Sciences › Immunology and Microbiology › Immunology › Complement system in diseases
Keywords
dendritic cells, C5a, C5a receptor, alloimmunity, T cell activation, IL-12, IL-10, MHC class II, CD86, PI3K/Akt signaling, NF-κB signaling, lipopolysaccharide stimulation
MeSH terms
Cyclic AMP, Animals, Dendritic Cells, Isoantigens, Lipopolysaccharides, Mice, Inbred BALB C, Mice, Inbred C57BL, Signal Transduction, CD4-Positive T-Lymphocytes, Up-Regulation, Complement C5a, NF-kappa B, Interleukin-10, Cyclic AMP-Dependent Protein Kinases, Mice, Knockout, Interleukin-12, Phosphatidylinositol 3-Kinases, MAP Kinase Signaling System, Receptor, Anaphylatoxin C5a, Proto-Oncogene Proteins c-akt, Mice

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