Abstract |
The role of IL-17A is important in protection against lung infection with Chlamydiae, an obligate intracellular bacterial pathogen. In this study, we explored the producers of IL-17A in chlamydial lung infection and specifically tested the role of major IL-17A producers in protective immunity. We found that γδT cells and Th17 cells are the major producers of IL-17A at the early and later stages of chlamydial infection, respectively. Depletion of γδT cells in vivo at the early postinfection (p.i.) stage, when most γδT cells produce IL-17A, failed to alter Th1 responses and bacterial clearance. In contrast, the blockade of IL-17A at the time when IL-17A was mainly produced by Th17 (day 7 p.i.) markedly reduced the Th1 response and increased chlamydial growth. The data suggest that the γδ T cell is the highest producer of IL-17A in the very early stages of infection, but the protection conferred by IL-17A is mainly mediated by Th17 cells. In addition, we found that depletion of γδ T cells reduced IL-1α production by dendritic cells, which was associated with a reduced Th17 response. This finding is helpful to understand the variable role of IL-17A in different infections and to develop preventive and therapeutic approaches against infectious diseases by targeting IL-17A.
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Authors | Hong Bai, Xiaoling Gao, Lei Zhao, Ying Peng, Jie Yang, Sai Qiao, Huili Zhao, Shuhe Wang, YiJun Fan, Antony George Joyee, Zhi Yao, Xi Yang |
Journal | Cellular & molecular immunology
(Cell Mol Immunol)
Vol. 14
Issue 10
Pg. 850-861
(Oct 2017)
ISSN: 2042-0226 [Electronic] China |
PMID | 27796286
(Publication Type: Journal Article)
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Chemical References |
- Interleukin-17
- Interleukin-1alpha
- Receptors, Antigen, T-Cell, gamma-delta
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Topics |
- Animals
- Bacterial Load
- Cells, Cultured
- Chlamydia Infections
(immunology)
- Chlamydiaceae
(physiology)
- Dendritic Cells
(immunology)
- Female
- Humans
- Immunity, Innate
- Interleukin-17
(metabolism)
- Interleukin-1alpha
(metabolism)
- Lung
(immunology, microbiology)
- Lymphocyte Depletion
- Mice
- Mice, Inbred BALB C
- Receptors, Antigen, T-Cell, gamma-delta
(metabolism)
- Th1 Cells
(immunology)
- Th17 Cells
(immunology)
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