Abstract:
:Recent studies suggest differential roles for CD103+ and CD11bhi lung dendritic cells (LDCs) in host defense against viral and bacterial infections. In this study, we examined the contribution of these LDC subsets in protective immunity to chlamydial lung infection using a Chlamydia muridarum mouse infection model. We found that CD103+ LDCs showed higher expression of costimulatory molecules (CD40, CD80 and CD86) and increased production of cytokines (IL-12p70, IL-10, IL-23 and IL-6) compared with CD11bhi LDCs, but the expression of programmed death-ligand 1 (PD-L1) was similar between the two subsets. More importantly, we found, in adoptive transfer experiments, that the mice receiving CD103+ LDCs from Chlamydia-infected mice exhibited better protection than the recipients of CD11bhi LDCs, which was associated with more robust Th1/Th17 cytokine responses. In addition, in vitro experiments showed that CD103+ LDCs induced stronger IFN-γ and IL-17 responses, when cocutured with chlamydial antigen-primed CD4+ T cells, than CD11bhi LDCs. Furthermore, the blockade of PD1 in the culture of CD4+ T cells with either CD103+ or CD11bhi LDCs enhanced production of IFN-γ and IL-17. In conclusion, our data provide direct evidence that CD103+ LDCs are more potent in promoting Th1/Th17 immunity to chlamydial lung infection than CD11bhi LDCs.
journal_name
Cell Mol Immunoljournal_title
Cellular & molecular immunologyauthors
Shekhar S,Peng Y,Wang S,Yang Xdoi
10.1038/cmi.2016.68subject
Has Abstractpub_date
2018-04-01 00:00:00pages
377-387issue
4eissn
1672-7681issn
2042-0226pii
10.1038/cmi.2016.68journal_volume
15pub_type
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