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J Immunol. 2013 Jun 15;190(12):5921-5. doi: 10.4049/jimmunol.1300847. Epub 2013 May 20.

Cutting edge: Receptors for C3a and C5a modulate stability of alloantigen-reactive induced regulatory T cells.

Author information

  • 1Division of Nephrology, Department of Medicine, Mount Sinai School of Medicine, New York, NY 10029, USA.

Abstract

CD4(+)Foxp3(+) regulatory T cells (Treg) are critical regulators of immune homeostasis and self-tolerance. Whereas thymic-derived or natural Treg stably express Foxp3, adaptive or induced Treg (iTreg) generated from peripheral CD4 T cells are susceptible to inflammation-induced reversion to pathogenic effector T cells. Building upon our previous observations that T cell-expressed receptors for C3a (C3aR) and C5a (C5aR) drive Th1 maturation, we tested the impact of C3aR/C5aR signaling on induction and stability of alloreactive iTreg. We observed that genetic deficiency or pharmacological blockade of C3aR/C5aR signaling augments murine and human iTreg generation, stabilizes Foxp3 expression, resists iTreg conversion to IFN-γ/TNF-α-producing efffector T cells, and, as a consequence, limits the clinical expression of graft-versus-host disease. Taken together, the findings highlight the expansive role of complement as a crucial modulator of T cell alloimmunity and demonstrate proof-of-concept that targeting C3a/C3aR and C5a/C5aR interactions could facilitate iTreg-mediated tolerance to alloantigens in humans.

PMID:
23690475
[PubMed - indexed for MEDLINE]
PMCID:
PMC3679341
Free PMC Article

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