» Articles » PMID: 18328742

Locally Produced Complement Fragments C5a and C3a Provide Both Costimulatory and Survival Signals to Naive CD4+ T Cells

Overview
Journal Immunity
Publisher Cell Press
Date 2008 Mar 11
PMID 18328742
Citations 302
Authors
Affiliations
Soon will be listed here.
Abstract

Costimulatory signals are critical to T cell activation, but how their effects are mediated remains incompletely characterized. Here, we demonstrate that locally produced C5a and C3a anaphylatoxins interacting with their G protein-coupled receptors (GPCRs), C5aR and C3aR, on APCs and T cells both upstream and downstream of CD28 and CD40L signaling are integrally involved in T cell proliferation and differentiation. Disabling these interactions reduced MHC class II and costimulatory-molecule expression and dramatically diminished T cell responses. Importantly, impaired T cell activation by Cd80-/-Cd86-/- and Cd40-/- APCs was reconstituted by added C5a or C3a. C5aR and C3aR mediated their effects via PI-3 kinase-gamma-dependent AKT phosphorylation, providing a link between GPCR signaling, CD28 costimulation, and T cell survival. These local paracrine and autocrine interactions thus operate constitutively in naive T cells to maintain viability, and their amplification by cognate APC partners thus is critical to T cell costimulation.

Citing Articles

The mycobiome in human cancer: analytical challenges, molecular mechanisms, and therapeutic implications.

Ding T, Liu C, Li Z Mol Cancer. 2025; 24(1):18.

PMID: 39815314 PMC: 11734361. DOI: 10.1186/s12943-025-02227-8.


Analysis of the Potential Link Between Dermatomyositis and Cancer.

Guo J, Lei T, Yu X, Wang P, Xie H, Jian G J Inflamm Res. 2024; 17:10163-10182.

PMID: 39649426 PMC: 11624688. DOI: 10.2147/JIR.S480744.


Complement and T cell activation in transplantation.

Alibrandi S, Clemens A, Chun N Transplant Rev (Orlando). 2024; 39(1):100898.

PMID: 39615218 PMC: 11710966. DOI: 10.1016/j.trre.2024.100898.


Complement System and Adhesion Molecule Skirmishes in Fabry Disease: Insights into Pathogenesis and Disease Mechanisms.

Magnusen A, Pandey M Int J Mol Sci. 2024; 25(22).

PMID: 39596318 PMC: 11594573. DOI: 10.3390/ijms252212252.


Old disease-New reflections: Gaucher, immunity, and inflammation.

Soroglu C, Berkay E J Cell Mol Med. 2024; 28(20):e70087.

PMID: 39463025 PMC: 11513444. DOI: 10.1111/jcmm.70087.


References
1.
Morikis D, Lambris J . Structural aspects and design of low-molecular-mass complement inhibitors. Biochem Soc Trans. 2002; 30(Pt 6):1026-36. DOI: 10.1042/bst0301026. View

2.
Alcazar I, Marques M, Kumar A, Hirsch E, Wymann M, Carrera A . Phosphoinositide 3-kinase gamma participates in T cell receptor-induced T cell activation. J Exp Med. 2007; 204(12):2977-87. PMC: 2118532. DOI: 10.1084/jem.20070366. View

3.
Medof M, Kinoshita T, NUSSENZWEIG V . Inhibition of complement activation on the surface of cells after incorporation of decay-accelerating factor (DAF) into their membranes. J Exp Med. 1984; 160(5):1558-78. PMC: 2187498. DOI: 10.1084/jem.160.5.1558. View

4.
Peng Q, Li K, Patel H, Sacks S, Zhou W . Dendritic cell synthesis of C3 is required for full T cell activation and development of a Th1 phenotype. J Immunol. 2006; 176(6):3330-41. DOI: 10.4049/jimmunol.176.6.3330. View

5.
Kopf M, Abel B, Gallimore A, Carroll M, Bachmann M . Complement component C3 promotes T-cell priming and lung migration to control acute influenza virus infection. Nat Med. 2002; 8(4):373-8. DOI: 10.1038/nm0402-373. View