Penehyclidine ameliorates acute lung injury by inhibiting Toll-like receptor 2/4 expression and nuclear factor-κB activation

Wang,Na; Su,Yue; Che,Xiang‑Ming; Zheng,Hui; Shi,Zhi‑Guo

doi:10.3892/etm.2016.3154

Penehyclidine ameliorates acute lung injury by inhibiting Toll-like receptor 2/4 expression and nuclear factor-κB activation

Authors:
- Na Wang
- Yue Su
- Xiang‑Ming Che
- Hui Zheng
- Zhi‑Guo Shi
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Affiliations: Department of Anesthesiology, Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing 100026, P.R. China, Department of Anesthesiology, Cancer Institute and Hospital, Chinese Academy of Medical Sciences, Beijing 100021, P.R. China, Department of Anesthesiology, Beijing Tuberculosis and Thoracic Tumor Research Institute, Beijing 101149, P.R. China
Published online on: March 11, 2016 https://doi.org/10.3892/etm.2016.3154
Pages: 1827-1832

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Abstract

The aim of the present study was to investigate the effect of penehyclidine (PHC) on endotoxin-induced acute lung injury (ALI), as well as to examine the mechanism underlying this effect. A total of 60 rats were randomly divided into five groups, including the control (saline), LPS and three LPS + PHC groups. ALI was induced in the rats by injection of 8 mg lipopolysaccharide (LPS)/kg body weight. The rats were then treated with or without PHC at 0.3, 1 or 3 mg/kg body weight 1 min following LPS injection. After 6 h, serum levels of tumor necrosis factor (TNF)‑α and interleukin (IL)‑6 were determined by ELISA. In addition, the mRNA expression levels of toll‑like receptor (TLR)2 and TLR4 were examined by reverse transcription‑quantitative polymerase chain reaction in the lung tissue samples, and nuclear factor (NF)‑κB p65 protein expression levels were examined by western blot analysis. The results demonstrated that lung injury was ameliorated by treatment with PHC (1 and 3 mg/kg body weight) as compared with treatment with LPS alone. Injection of LPS significantly increased the mRNA expression levels of TLR2 and TLR4, as well as the protein expression levels of NF‑κB p65 in the lung tissue samples. Serum levels of TNF‑α and IL‑6 were also upregulated by LPS injection. Treatment of the rats with PHC following LPS injection suppressed the LPS‑induced increase in TLR2/4 mRNA and NF‑κB p65 protein expression levels. PHC also inhibited the increase in TNF‑α and IL‑6 serum levels. In addition, PHC reduced LPS‑induced ALI and decreased the serum levels of TNF‑α and IL‑6, possibly by downregulating TLR2/4 mRNA expression and inhibiting NF-κB activity, and consequently alleviating the inflammatory response.

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