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PLoS One. 2014 Aug 1;9(8):e104064. doi: 10.1371/journal.pone.0104064. eCollection 2014.

Bordetella adenylate cyclase toxin differentially modulates toll-like receptor-stimulated activation, migration and T cell stimulatory capacity of dendritic cells.

Author information

1
Laboratory of Molecular Biology of Bacterial Pathogens, Institute of Microbiology of the Academy of Sciences of the Czech Republic, Prague, Czech Republic.
2
Institute of Immunology, Charles University, 2nd Faculty of Medicine and University Hospital Motol, Prague, Czech Republic.
3
Laboratory of Tumor Immunology, Institute of Microbiology of the Academy of Sciences of the Czech Republic, Prague, Czech Republic.
4
Laboratory of Specific Cellular Immunity, Institute of Microbiology of the Academy of Sciences of the Czech Republic, Prague, Czech Republic.
5
Immune Regulation Research Group, School of Biochemistry and Immunology, Trinity College, Dublin, Ireland.

Abstract

Adenylate cyclase toxin (CyaA) is a key virulence factor of the whooping cough agent Bordetella pertussis. The toxin targets CD11b-expressing phagocytes and delivers into their cytosol an adenylyl cyclase (AC) enzyme that subverts cellular signaling by increasing cAMP levels. In the present study, we analyzed the modulatory effects of CyaA on adhesive, migratory and antigen presenting properties of Toll-like receptor (TLR)-activated murine and human dendritic cells (DCs). cAMP signaling of CyaA enhanced TLR-induced dissolution of cell adhesive contacts and migration of DCs towards the lymph node-homing chemokines CCL19 and CCL21 in vitro. Moreover, we examined in detail the capacity of toxin-treated DCs to induce CD4(+) and CD8(+) T cell responses. Exposure to CyaA decreased the capacity of LPS-stimulated DCs to present soluble protein antigen to CD4+ T cells independently of modulation of co-stimulatory molecules and cytokine production, and enhanced their capacity to promote CD4(+)CD25(+)Foxp3(+) T regulatory cells in vitro. In addition, CyaA decreased the capacity of LPS-stimulated DCs to induce CD8(+) T cell proliferation and limited the induction of IFN-γ producing CD8(+) T cells while enhancing IL-10 and IL-17-production. These results indicate that through activation of cAMP signaling, the CyaA may be mobilizing DCs impaired in T cell stimulatory capacity and arrival of such DCs into draining lymph nodes may than contribute to delay and subversion of host immune responses during B. pertussis infection.

PMID:
25084094
PMCID:
PMC4118975
DOI:
10.1371/journal.pone.0104064
[Indexed for MEDLINE]
Free PMC Article

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