Basic Immunology
Influences of IL-17 on regulatory T cell proliferation and IL-10 secretion during the very early stage of Chlamydia trachomatis respiratory tract infection
Zhang Hong, Pang Gaoju, Zha Xiaoyu, Niu Wenhao, Liu Tengli, Zhao Huili, Bai Hong
Published 2018-11-30
Cite as Chin J Microbiol Immunol, 2018,38(11): 807-811. DOI: 10.3760/cma.j.issn.0254-5101.2018.11.002
Abstract
ObjectiveTo investigate the influences of IL-17 on regulatory T (Treg) cells during Chlamydia trachomatis infection.
MethodsWild-type (WT) C57BL/6 mice and IL-17-/- mice were intranasally injected with 1×103 inclusion forming units (IFU) of Chlamydia muridarum (Cm) to establish the mouse model of Chlamydia trachomatis respiratory tract infection. Mouse spleen and lung single cells were prepared. The percentages of CD4+ CD25+ T and CD4+ CD25+ Foxp3+ T cells were detected by flow cytometry. Expression of Foxp3 and TGF-β at mRNA level in lung was detected by RT-PCR. The levels of IL-10 in bronchoalveolar lavage fluid samples were detected by ELISA.
ResultsCompared with the WT mice, the IL-17-/- mice had higher percentages of CD4+ CD25+ T and CD4+ CD25+ Foxp3+ T cells in spleen and lung on the third day of Cm infection. Both of the expression of Foxp3 at mRNA level in lung and the secretion of IL-10 in bronchoalveolar lavage fluid were increased in IL-17-/- mice as compared with those in WT mice. No significant difference in the expression of TGF-β at mRNA level in lung tissues was found between the two groups.
ConclusionIL-17 might inhibit the proliferation of Treg cells and the secretion of IL-10 in the very early stage of Cm respiratory tract infection.
Key words:
Chlamydia; Treg; IL-17; Th17
Contributor Information
Zhang Hong
Department of Immunology of Basic Medical College, Key Laboratory of Immune Microenvironment and Disease of the Ministry of Education, Key Laboratory of Cellular and Molecular Immunology of Tianjin, Tianjin Medical University, Tianjin 300070, China
Pang Gaoju
Zha Xiaoyu
Niu Wenhao
Liu Tengli
Zhao Huili
Bai Hong