English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Bordetella bronchiseptica is a Gram-negative bacterium equipped with several colonization factors that allow it to establish a persistent infection of the murine respiratory tract. Previous studies indicate that B. bronchiseptica adenylate cyclase toxin (ACT) and the type III secretion system (TTSS) synergize to drive dendritic cells into an altered phenotype to down-regulate the host immune response. In this study, we examined the effects of B. bronchiseptica ACT and TTSS on murine bone marrow-derived macrophages. We demonstrate that ACT and TTSS are required for the inhibition of Ag-driven CD4+ T cell proliferation by bacteria-infected macrophages. We identify PGE2 as the mediator of this inhibition, and we show that ACT and the TTSS synergize to increase macrophage production of PGE2. We further demonstrate that B. bronchiseptica can modulate normal macrophage function and drive the immune response toward a Th17 phenotype classified by the significant production of IL-17. In this study, we show that B. bronchiseptica-infected macrophages can induce IL-17 production from naive CD4+ splenocytes, and that lung tissues from B. bronchiseptica-infected mice exhibit a strong Th17 immune response. ACT inhibited surface expression of CD40 and CD86, suppressed TNF-alpha production, and up-regulated IL-6 production. TTSS also synergized with ACT to up-regulate IL-10 and PGE2 secretion. These findings indicate that persistent colonization by B. bronchiseptica may rely on the ability of the bacteria to differentially modulate both macrophage and dendritic cell function leading to an altered adaptive immune response and subsequent bacterial colonization.

the journal of immunology/the journal of immunology

<i>Bordetella bronchiseptica</i> Modulates Macrophage Phenotype Leading to the Inhibition of CD4+ T Cell Proliferation and the Initiation of a Th17 Immune Response

Bordetella bronchiseptica Modulates Macrophage Phenotype Leading to the Inhibition of CD4+ T Cell Proliferation and the Initiation of a Th17 Immune Response