外源性心钠素对小鼠过敏性哮喘气道炎症的影响及其机制分析

摘要

目的 探讨外源性心钠素对过敏性哮喘小鼠模型气道炎症的影响作用及其作用机制.方法 选取SPF级BALBc小鼠48只,采用随机数字表法分为对照组(等量生理盐水干预)、模型组(等量生理盐水干预)、实验组A(外源性心钠素0.5,μg/g)、实验组B(外源性心钠素0.5 μg/g+A71915).模型组、实验组A、实验组B建模成功后给予对应处理措施,在最后一次激发实验后24 h,采集各组血清、支气管肺泡灌洗液检查炎症因子,采用HE染色观察肺组织病理变化,采用Western blot技术检测肺组织中锌指转录因子(GATA3)蛋白的表达水平.结果 模型组小鼠的血液中EOS、淋巴细胞、中性粒细胞所占比例均高于对照组(P＜0.05),实验组A的血液中EOS、淋巴细胞、中性粒细胞所占比例均高于模型组、实验组B(P＜0.05);模型组小鼠的肺泡灌洗液中EOS、淋巴细胞、中性粒细胞计数、IL-6、TNF-α水平均高于对照组(P＜0.05),实验组A的肺泡灌洗液中EOS、淋巴细胞、中性粒细胞计数、IL-6、TNF-α水平均高于模型组、实验组B(P＜0.05);模型组小鼠的肺组织中GATA3蛋白表达水平均高于对照组(P＜0.05),实验组A肺组织中GATA3蛋白表达水平高于模型组、实验组B(P＜0..05).结论 外源性心钠素会进一步加剧过敏性哮喘小鼠模型的气道炎症反应,与激活炎性细胞、炎症因子释放及增强肺组织中GATA3蛋白表达有关.%Objective To investigate the effect of exogenous atrial natriuretic peptide on airway inflammation in allergic asthma mice model and its mechanism.Methods A total of 48 SPF 48 BALBc mice were selected and randomly divided into the normal group (equal quantity normal saline intervention),model group (equal quantity normal saline intervention),experimental group A (exogenous atrial natriuretic peptide 0.5 μg/g) and experimental group B(exogenous atrial natriuretic peptide 0.5 μg/g-+-A71915).The model group,experimental group A and B were given the corresponding treatment measures after successfully constructing the model,at 24 after the last provocation test,serum and bronchoalveolar lavage fluid in each group were collected for detecting inflammation factors.The HE staining was used to observe the pathological changes of lung tissue,the expression level of GATA3 protein in lung tissue was detected by Western blot technology.Results The blood EOS,lymphocyte and neutrophil ratio in the model group were higher than those in the normal group (P＜0.05),which in the experimental group A were higher than those in the model group and experimental group B (P＜0.05);bronchoalveolar lavage fluid EOS,lymphocytes,neutrophil ratio,IL-6,TNF-α levels in the model group were higher than those in the normal group (P＜0.05),alveolar lavage fluid EOS,lymphocyte,neutrophil count,IL-6 and TNF-α levels in the experimental group A were higher than those in the model group and experimental group B (P＜0.05);the expression level of GATA3 protein in lung tissue of the model group was higher than that in the normal group(P＜0.05),the expression level of lung tissue GATA3 protein in the experimental group A was higher than that in the model group and experimental group B (P＜0.05).Conclusion Exogenous atrial natriuretic peptide can further aggravate airway inflammation reaction in allergic asthma mice model,which is related to the activation of inflammatory cells,the release of inflammatory cytokines and the increase of GATA3 protein expression in lung tissue.