可乐定通过激活胆碱能抗炎通路抑制肺损伤小鼠炎性反应

目的:探讨可乐定对肺损伤小鼠炎性反应的影响及其作用机制。方法:以脂多糖(lipopolysac charide,LPS)诱导的肺损伤小鼠为模型,静脉注射可乐定,取左肺上叶组织,检测肺湿干重比(W/D)和总肺含水量(TLW),ELISA试剂盒检测炎性因子IL-1β、IL-6和TNF-α的含量,RT-PCR和Western blot检测α7烟碱型乙酰胆碱受体(α7nAChR)、高迁移率族蛋白B1(HMGB1)表达的变化;鼻内吸入法将α7nAChR基因RNA干扰慢病毒载体导入肺损伤模型小鼠肺内,或者静脉注射HMGB1外源性蛋白,检测炎性因子和HMGB1的变化。结果:可乐定可减轻LPS诱导的小鼠肺损伤,并通过降低细胞因子IL-6、IL-10和TNF-α水平从而抑制LPS诱导的炎性反应;可乐定促进α7nAChR表达从而激活胆碱能抗炎通路,并抑制HMGB1的表达。结论:可乐定对肺损伤小鼠具有抗炎作用,这可能与激活胆碱能抗炎通路,抑制HMGB1的表达有关。

Clonidine inhibits inflammatory response in lung injury mice through cholinergic anti-inflammatory pathway

AIM:To explore the influence of clonidine on inflammatory response in lung injury mice and its possible mechanism.METHODS:Clonidine solution was intravenously injected into the mice with lung injury induced by LPS.The left upper lobe of the lung was collected to detect lung wet/dry weight ratio (W/D) and total lung water content (TLW).The concentrations of IL-6,IL-1β and TNF-α were measured by ELISA.The expression of α7 nicotinic acetylcholine receptor (α7nAChR) and high-mobility group box protein 1(HMGB1) at mRNA and protein levels was determined by RT-PCR and Western blot.After importing α7nAChR siRNA lentiviral vector or injecting exogenous HMGB1 protein,the inflammatory cytokines were detected.RESULTS:Clonidine attenuated lung injury and inhibited inflammatory reaction.Clonidine promoted the activation of cholinergic anti-inflammatory pathway by promoting α7nAChR expression.Clonidine inhibited HMGB1 expression,which promoted the secretion of IL-6,IL-1β and TNF-α.HMGB1 was negatively regulated by α7nAChR.CONCLUSION:Clonidine functions as an anti-inflammatory reagent to the lung injury mice.The mechanism may be related to activating the cholinergic anti-inflammatory pathway and inhibiting the expression of HMGB1.