咪喹莫特对哮喘小鼠气道反应性及气道重塑的影响

目的:观察咪喹莫特对哮喘小鼠气道反应性,气道重塑和肺组织血管内皮生长因子(VEGF)表达的影响.方法:30只小鼠按随机数字表法分成3组,每组10只.正常对照组、哮喘组、咪喹莫特组.小鼠于第0、14天以鸡卵白蛋白(OVA)致敏,第24天开始雾化吸人1%OVA激发并持续28天,建立哮喘气道重塑模型.咪喹莫特组在吸人OVA前2 h雾化吸人咪喹莫特30 min.于最后一次雾化结束后24 h,利用肺功能仪测小鼠气道阻力;收集支气管肺泡灌洗液(BALF)进行细胞计数及分类;对肺组织切片行HE染色观察病理学改变:运用医学图像分析软件测定肺组织切片中的血管计数、血管壁平滑肌厚度、血管壁平滑肌细胞计数:用免疫组化方法检测肺组织VEGF的蛋白表达水平;用RT-PCR检测肺组织VEGF mRNA表达水平.结果:哮喘组小鼠呼气阻力(Re)高于对照组(P<0.05),咪喹莫特组Re低于哮喘组(JP<0.05);哮喘组BALF中细胞总数及各种炎症细胞数均较对照组升高(P<0.05).咪喹莫特组较哮喘组降低(P<0.05);哮喘组血管计数、血管壁平滑肌细胞计数较对照组增高,差异均有统计学意义(P<0.05),咪喹莫特组血管计数较哮喘组下降,差异有统计学意义(P<0.05);对照组VEGF蛋白和mRNA在气道不表达或轻度表达,哮喘组VEGF蛋白和mRNA表达较对照组增加,差异有统计学意义(P<0.05),咪喹莫特组能减少VEGF蛋白和mRNA的表达,与哮喘组比较差异有统计学意义(P<0.05),但较对照组仍增加,差异无统计学意义(P>0.05).结论:早期预防性雾化吸入咪喹莫特通过部分抑制哮喘肺组织VEGF蛋白和mRNA的过度表达,阻止慢性哮喘小鼠的血管生成,可在一定程度上减轻哮喘小鼠的气道重塑和气道高反应性.

Effects of imiquimod on airway hyperresponsiveness and airway remodeling in an asthmatic mouse model

Objective:To observe the effects of imiquimod on airway hyperresponsiveness, airway remodeling and the expression of vascular endothelial growth factor (VEGF) in an asthmatic mouse model. Methods:Mice were randomly divided into a control group (A group), an asthmatic group(B group) and an imiquimod group(C group), each in ten. Mice were sensitized on days 0 and 14 by OVA and challenged from days 24 to 51 by OVA repeatedly to establish a chronic asthmatic model. C group were interfered with aerosol Imiquimod...