慢性阻塞性肺疾病大鼠肺组织JNK／SAPK 水平变化及意义

摘要

目的：探讨 C-Jun 氨基末端蛋白激酶（JNK）／应激激活蛋白激酶（SAPK）在慢性阻塞性肺疾病（COPD）大鼠肺组织中的水平变化及意义。方法16只Ⅱ级 Wistar 雄性大鼠随机分为对照组和 COPD 组。对照组不予任何处理，COPD 组给予烟熏刺激，造成大鼠 COPD 动物模型。造模成功后，光镜下观察肺组织病理，动物肺功能检测仪检测肺功能，ELISA 法检测大鼠肺组织 TNF-α水平，免疫组化法检测肺组织 JNK／SAPK 表达，RT-PCR 检测肺组织JNK／SAPK mRNA 表达水平。结果 COPD 组光镜下出现了大量炎性细胞浸润，部分肺泡融合，肺泡数量减少，证明 COPD 造模成功。与对照组比较，COPD 组第0．3秒用力呼气容积与用力呼气容积的比值降低，呼气阻力、吸气阻力升高，动态顺应性下降（P ＜0．05或＜0．01），TNF-α升高（P ＜0．05）；免疫组化结果显示，COPD 组肺组织中JNK／SAPK 蛋白表达高于对照组（P 均＜0．05）。RT-PCR 结果显示，与对照组相比，COPD 组 JNK／SAPK mRNA 水平升高（P 均＜0．05）。JNK／SAPK mRNA 表达水平与 TNF-α呈正相关（r ＝0．751，P ＜0．05）。结论烟雾诱导的COPD 大鼠 JNK／SAPK 水平升高，其可能通过激活烟雾诱导的炎症因子，导致气道炎症和肺气肿，促进 COPD 发生。%Objective To investigate the changes in levels of c-Jun N-terminal kinase /stress-activated protein kinase (JNK/SAPK)in the lung tissues of rats with chronic obstructive pulmonary disease (COPD).Methods Sixteen Ⅱ male Wistar rats were randomly divided into two groups:the control group and COPD group.The control group was not treated, while the COPD group was stimulated with smoke to set up COPD models.After models were established,we detected the lung pathology through optical microscope,pulmonary function through animal pulmonary instrument,TNF-αexpression in lung tissue through ELISA,JNK/SAPK expression through immunohistochemistry,and JNK mRNA expression through RT-PCR.Results In the COPD group,light microscope showed that there was a large number of inflammatory cell infiltra-tion,alveolar fusion,and alveolar reduction,which proved the COPD model was successful.Compared with the control group,FEV0.3 /FVC decreased,Ri and Re increased,and Cldyn decreased (P <0.05 or P <0.01 ),and TNF-αin-creased in the COPD group (P <0.05).Immunohistochemistry showed that JNK/SAPK expression improved in the COPD group.RT-PCR result showed JNK mRNA expression increased in the COPD group as compared with that of the control group (all P <0.05).JNK mRNA expression was positively correlated with TNF-α(r =0.751,P <0.05).Conclusion The level of JNK/SAPK increases in smoke-stimulated COPD rats,which can cause airway inflammation and emphysema, and promote the occurrence of COPD through activating smoke-induced inflammatory cytokines.