Chlamydia muridarum respiratory infection induces infiltration and polarization of alveolar macrophages and pulmonary interstitial macrophages
10.3760/cma.j.cn112309-20220106-00005
- VernacularTitle:沙眼衣原体小鼠肺炎菌株呼吸道感染诱导肺泡巨噬细胞和肺间质巨噬细胞浸润并极化
- Author:
Tongxing QU
1
;
Shuaini YANG
;
Jiajia ZENG
;
Yueyue XU
;
Xiaoyu ZHA
;
Lu TAN
;
Yuqing TUO
;
Ruoyuan SUN
;
Hong ZHANG
;
Hong BAI
Author Information
1. 天津医科大学基础医学院免疫学系，国家教育部免疫微环境与疾病重点实验室，天津市细胞和分子免疫学重点实验室，天津 300070
- Keywords:
Chlamydia muridarum;
Alveolar macrophages;
Pulmonary interstitial macrophages;
Polarization;
Inflammatory response
- From:
Chinese Journal of Microbiology and Immunology
2022;42(8):592-601
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To investigate the effects of Chlamydia muridarum ( Cm) respiratory tract infection on the infiltration and polarization of alveolar macrophages (AMs) and pulmonary interstitial macrophages (IMs). Methods:A C57BL/6 mouse model of Cm respiratory tract infection was established through nasal inhalation. Flow cytometry was used to detect AMs (CD45 + F4/80 + CD11c + ) and IMs (CD45 + F4/80 + CD11c -) in lung tissues at 0, 3, 7 and 14 d after Cm respiratory tract infection. The proportions of M1 (CD80 + , CD86 + , MHCⅡ + , iNOS + ) and M2 (CD206 + , Arg1 + ) macrophages in AMs and IMs were also detected. Results:(1) Cm respiratory tract infection induced the infiltration of AMs and IMs. Compared with the uninfected group (0 d), the proportions and the numbers of AMs and IMs of were significantly increased 3 d after infection ( P<0.05, P<0.01). The numbers of AMs and IMs reached the peak 7 d after infection ( P<0.001). (2) Compared with the uninfected group, the proportions of CD80 + and CD86 + cells in AMs were significantly up-regulated 3 d after infection ( P<0.05, P<0.01); the proportion of MHCⅡ + cells in AMs increased after infection and reached the peak at 14 d ( P<0.05), while the proportion of CD206 + cells decreased after infection ( P<0.05). (3) Compared with the uninfected group, the proportions of CD80 + and CD86 + cells in IMs were increased 3 d after infection ( P<0.05, P<0.001) and the proportion of MHCⅡ + cells was significantly increased 14 d after infection ( P<0.01), while there was no significant change in the proportion of CD206 + cells. (4) In AMs, the proportion of iNOS + cells increased continuously after infection ( P<0.01), while the proportion of Arg1 + cells decreased continuously after infection, especially at 7 d and 14 d ( P<0.05). In IMs, the proportion of iNOS + cells reached the peak at 7 d ( P<0.001), but the proportion of Arg1 + cells showed no significant change after infection. Conclusions:Cm respiratory tract infection induced the infiltration of AMs and IMs, stimulated the polarization of AMs and IMs towards the M1 phenotype and weakened the polarization of AMs to M2 macrophages, but had no significant influence on the polarization of IMs towards the M2 phenotype.
