• 1. Department of Pulmonary and Critical Care Medicine, Shanghai Fifth People's Hospital, Fudan University, Shanghai 200240, P. R. China;
  • 2. Center of Community-Based Health Research, Fudan University, Shanghai 200240, P. R. China;
  • 3. Department of Pulmonary and Critical Care Medicine, Ningbo Medical Center Lihuili Hospital, Ningbo, Zhejiang 315040, P. R. China;
JIE Zhijun, Email: shijindong@fudan.edu.cn; SHI Jindong, Email: jiezjlxh@163.com
Export PDF Favorites Scan Get Citation

Objective  To investigate whether p38 mitogen activated protein kinase (p38MAPK) inhibitor can reduce acute lung injury (ALI) caused by lipopolysaccharide (LPS) by regulating Th17/Treg balance. Methods  Balb/c mice were randomly divided into a control group, an ALI group and an intervention group. The mice in the control group were injected with phosphate-buffered saline, the mice in the ALI group were intraperitoneally injected with 40 mg/kg LPS, and the mice in the intervention group were injected with SB203580 (0.5 mg/kg, 1 mg/kg, 2 mg/kg, 5 mg/kg) intraperitoneally 1 h prior to the intraperitoneal injection of LPS. All mice were killed on 12 h later respectively. Hematoxylin-eosinstin staining was used to observe the pathological changes of lung tissue, and cell classification, counting, and total protein levels in bronchoalveolar lavage fluid (BALF) were detected. Transcript expression of forkhead box p3 (Foxp3) and retinoic acid receptor-related orphan receptor-γt (RORγt) was detected by real-time polymerase chain reaction. Interleukin (IL)-6, IL-10, IL-17, IL-23 and transforming growth factor-β (TGF-β) in lung tissue and IL-6, tumor necrosis factor-α (TNF-α) in serum were measured by enzyme-linked immunosorbent assay. The Th17 and Treg subset distribution in spleen was determined by flow cytometry. Results  Histopathological examination showed that LPS induced inflammatory cell infiltration in lung tissue, increased cell count and protein levels in BALF (P<0.05), and increased proportion of neutrophils and monocytes in the ALI mice. SB203580 significantly attenuated tissue injury of the lungs in LPS-induced ALI mice. Serum levels of IL-6 and TNF-α in the ALI group were significantly higher than those in the control group, and inflammatory cytokines were decreased after SB203580 intervention. Compared with the ALI group, the production of inflammatory cytokines associate with Th17, including IL-17, IL-23, RORγt was inhibited, and the production of cytokines associate with Treg, such as IL-10 and Foxp3 in lung tissue was increased in the intervention group in a concentration-dependent manner with SB203580. After SB203580 intervention, Th17/Treg ratio was significantly decreased compared with the LPS group (P<0.05). Conclusion  p38MAPK inhibitor can reduce LPS-induced ALI by regulating the imbalance of Treg cells and Th17 cells.

Citation: FENG Jingjing, SHAO Chuan, LI Junqing, SHI Tianyun, DU Yong, JIE Zhijun, SHI Jindong. p38MAPK inhibitor ameliorates lipopolysaccharide induced acute lung injury through regulating the balance of Treg cells and Th17 cells. Chinese Journal of Respiratory and Critical Care Medicine, 2023, 22(1): 44-51. doi: 10.7507/1671-6205.202205020 Copy

  • Previous Article

    Clinical study of shear wave elastography combined with diaphragm thickening fraction and rapid shallow breathing index to predict the outcome of patients with mechanical ventilation
  • Next Article

    体外膜氧合救治静脉二甲苯中毒致重度急性呼吸窘迫综合征患者一例