High doses of CpG oligodeoxynucleotides stimulate a tolerogenic TLR9–TRIF pathway

Claudia Volpi, Francesca Fallarino, Maria T. Pallotta, Roberta Bianchi, Carmine Vacca, Maria L. Belladonna, Ciriana Orabona, Antonella De Luca, Louis Boon, Luigina Romani, Ursula Grohmann and Paolo Puccetti ()
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Claudia Volpi: University of Perugia
Francesca Fallarino: University of Perugia
Maria T. Pallotta: University of Perugia
Roberta Bianchi: University of Perugia
Carmine Vacca: University of Perugia
Maria L. Belladonna: University of Perugia
Ciriana Orabona: University of Perugia
Antonella De Luca: University of Perugia
Louis Boon: Bioceros BV
Luigina Romani: University of Perugia
Ursula Grohmann: University of Perugia
Paolo Puccetti: University of Perugia

Nature Communications, 2013, vol. 4, issue 1, 1-11

Abstract: Abstract CpG-rich oligodeoxynucleotides activate the immune system, leading to innate and acquired immune responses. The immune-stimulatory effects of CpG-rich oligodeoxynucleotides are being exploited as a therapeutic approach. Here we show that at high doses, CpG-rich oligodeoxynucleotides promote an opposite, tolerogenic response in mouse plasmacytoid dendritic cells in vivo and in a human in vitro model. Unveiling a previously undescribed role for TRIF and TRAF6 proteins in Toll-like receptor 9 (TLR9) signalling, we demonstrate that physical association of TLR9, TRIF and TRAF6 leads to activation of noncanonical NF-κB signalling and the induction of IRF3- and TGF-β-dependent immune-suppressive tryptophan catabolism. In vivo, the TLR9–TRIF circuit—but not MyD88 signalling—was required for CpG protection against allergic inflammation. Our findings may be relevant to an increased understanding of the complexity of Toll-like receptor signalling and optimal exploitation of CpG-rich oligodeoxynucleotides as immune modulators.

Date: 2013
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms2874

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DOI: 10.1038/ncomms2874

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