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Li J, Dong X, Zhao L, Wang X, Wang Y, Yang X, Wang H, Zhao W. Natural killer cells regulate Th1/Treg and Th17/Treg balance in chlamydial lung infection. J Cell Mol Med 2016; 20:1339-51. [PMID: 27028780 PMCID: PMC4929289 DOI: 10.1111/jcmm.12821] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2015] [Accepted: 01/30/2016] [Indexed: 12/20/2022] Open
Abstract
Natural killer (NK) cell is an important component in innate immunity, playing a critical role in bridging innate and adaptive immunity by modulating the function of other immune cells including T cells. In this study, we focused on the role of NK cells in regulating Th1/Treg and Th17/Treg balance during chlamydial lung infection. We found that NK cell‐depleted mice showed decreased Th1 and Th17 cells, which was correlated with reduced interferon‐γ, interleukin (IL)‐12, IL‐17 and IL‐22 production as well as T‐bet and receptor‐related orphan receptor gamma t expression compared with mice treated with the isotype control antibody. In contrast, NK cell depletion significantly increased Treg in cell number and related transcription factor (Foxp3) expression. The opposite trends of changes of Th1/Th17 and Treg led to significant reduction in the Th1/Treg and Th17/Treg ratios. The data implicate that NK cells play an important role in host defence against chlamydial lung infection, mainly through maintaining Th1/Treg and Th17/Treg balance.
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Affiliation(s)
- Jing Li
- Department of Pathogenic Biology, Shandong University School of Medicine, Jinan, Shandong, China
| | - Xiaojing Dong
- Department of Pathogenic Biology, Shandong University School of Medicine, Jinan, Shandong, China
| | - Lei Zhao
- Institute of Basic Medical Science, Qilu Hospital of Shandong University, Jinan, Shandong, China
| | - Xiao Wang
- Department of Pathology, Shandong University School of Medicine, Jinan, Shandong, China
| | - Yan Wang
- Department of Pathology, Shandong University School of Medicine, Jinan, Shandong, China
| | - Xi Yang
- Department of Pathogenic Biology, Shandong University School of Medicine, Jinan, Shandong, China.,Department of Immunology and Department of Medical Microbiology, Faculty of Medicine, University of Manitoba, Winnipeg, MB, Canada
| | - Hong Wang
- Department of Pathogenic Biology, Shandong University School of Medicine, Jinan, Shandong, China
| | - Weiming Zhao
- Department of Pathogenic Biology, Shandong University School of Medicine, Jinan, Shandong, China
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