N-乙酰半胱氨酸对香烟暴露小鼠肺组织中 IL-17A 及 IL-22的影响

摘要

Objective To investigate the changes of interleukin-17A(IL-17A)and interleukin-22(IL-22)in the lung of cigarette smoke exposed mice and the effect of smoking cessation and N -acetylcysteine (NAC )treatment . Methods BALB /c mice in experimental groups were exposed to cigarette smoke.Then the smoke-exposure was stopped and mice were treated with NAC gavage.The mice were executed 1,2,and 3 months after smoking cessa-tion.Lung tissue sample and bronchoalveolar lavage fluid(BALF)were collected.HE staining was used to observe the pathologic changes of the lung and ELISA was used to measure the level of IL-17A and IL-22.Results Con-siderable emphysematous changes was found in the lung of mice exposed to cigarette smoke.Compared with the controls,the level of IL-17A and IL-22 elevated remarkably in pulmonary tissue and BALF after smoking exposure and declined gradually after smoking cessation.Additional NAC gavage treatment enhanced the decline tendency. Conclusion IL-17A and IL-22 might play a complex role in the chronic inflammatory changes of lung in mice ex-posed to cigarette smoke.%目的：探讨香烟暴露诱导的肺气肿小鼠肺组织中白介素-17A（IL-17A）以及白介素-22（IL-22）的变化以及戒烟、N-乙酰半胱氨酸（NAC）对 IL-17A 和 IL-22的影响。方法采用香烟暴露法建立小鼠肺气肿模型，给予戒烟及 NAC 灌胃干预。采用 ELISA 法检测肺匀浆及肺泡灌洗液（BALF）中IL-17A 和 IL-22浓度。HE 染色观察肺组织病理学变化。结果香烟暴露可使小鼠肺组织发生肺气肿样变化。与正常对照组相比，肺匀浆及 BALF 中，香烟暴露后 IL-17A 及 IL-22水平升高（P ＜0．05）。与香烟暴露组比较，戒烟及 NAC 灌胃后 IL-17A 及 IL-22水平下降（P ＜0．05）。肺匀浆及 BALF中 IL-22与 IL-17A 的比值逐渐降低。结论 IL-17A 及 IL-22与香烟暴露导致的小鼠肺组织中慢性炎症的发生有关。戒烟及 NAC 处理对吸烟导致的 IL-17A 及 IL-22变化有一定干预作用。