Journal Article

PD-1 is a novel regulator of human B-cell activation

Marie-Laure Thibult, Emilie Mamessier, Julie Gertner-Dardenne, Sonia Pastor, Sylvaine Just-Landi, Luc Xerri, Bruno Chetaille and Daniel Olive

in International Immunology

Volume 25, issue 2, pages 129-137
Published in print February 2013 | ISSN: 0953-8178
Published online October 2012 | e-ISSN: 1460-2377 | DOI: http://dx.doi.org/10.1093/intimm/dxs098
PD-1 is a novel regulator of human B-cell activation

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The outcome of the adaptive immune response is determined by the integration of both positive and negative signals, respectively, induced upon the triggering of co-signaling receptors. One of them, programmed cell death 1 (PDCD1/PD-1) has largely been shown to be involved in the negative regulation of T-cell activation. However, PD-1 is also expressed on human B cells, and its role(s) in the process of human B-cell activation remains uncertain thus far. In this study, we describe the expression of PD-1 on the major human B-cells subsets isolated from peripheral blood and lymph nodes. We showed that PD-1 was expressed on naive B cells, was differentially expressed on peripheral IgM memory as compared with memory B cells and was lost on germinal center B cells. Expression of PD-1 ligands (PD-Ls) was induced by TLR9 activation. Finally, we showed that PD-1 was recruited to the B-cell receptor upon triggering. We determined that during TLR9 activation, blockade of PD-1/PD-Ls pathways indeed increased B-cell activation, proliferation and the production of inflammatory cytokines. Altogether, our results show, that, as reported in T cells, PD-1/PD-Ls complexes acted as inhibitors of the B-cell activation cascade and highlight the importance of devising future therapies able to modulate lymphocyte activation through the targeting of the PD-1/PD-Ls pathways.

Keywords: B cells; CpG; co-signalization; PD-1

Journal Article.  5958 words.  Illustrated.

Subjects: Immunology ; Biological Sciences

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