STAT6圈套寡核苷酸对支气管哮喘小鼠Eotaxin表达及气道炎症的抑制作用

目的观察STAT6圈套寡核苷酸(ODN)对支气管哮喘小鼠嗜酸性粒细胞趋化因子(Eotaxin)表达及气道炎症的影响,探讨STAT6圈套ODN治疗支气管哮喘的可行性。方法将BALB-C雌性小鼠随机分为:健康对照组(N组)、哮喘组(A组)、STAT6圈套ODN哮喘组(ST-ODN组)及无序ODN哮喘组(SC-ODN组),ODN经鼻气道滴入ST-ODN组及SC-ODN组小鼠肺部,荧光显微镜观察肺组织中异硫氰酸荧光素标记的寡核苷酸(FITC-ODN)的分布;测定肺泡灌洗液(BALF)中白细胞(WBC)、淋巴细胞(LYM)及嗜酸性粒细胞(EOS)数量;观察气道炎症病理变化;免疫组化法检测肺组织Eotaxin蛋白;RT-PCR法检测肺组织Eotaxin mRNA表达。结果 (1)FITC-ODN转染组小鼠肺部发现FITC着色,ODN肺组织转染成功。(2)小鼠肺组织ST-ODN组较哮喘组炎症病理反应明显减轻。(3)BALF中哮喘组与空白对照组比较,WBC、LYM、EOS均增高,差异有统计学意义(P<0.01);ST-ODN组则明显低于哮喘组,差异有统计学意义(P<0.01);而SC-ODN组与哮喘组比较差异无统计学意义(P>0.05);(4)Eotaxin蛋白及mRNA表达:哮喘组明显高于空白对照组,差异有统计学意义(P<0.01);ST-ODN组低于哮喘组,差异有统计学意义(P<0.01);而SC-ODN组与哮喘组比较,差异无统计学意义(P>0.05)。结论 STAT6圈套ODN可经鼻气道滴入方式直接转染至小鼠肺组织;STAT6圈套ODN可抑制Eotaxin的表达,调控哮喘小鼠气道的EOS聚集;抑制哮喘小鼠气道炎症反应。

Inhibitory effects of STAT6 decoy oligonucleotides on Eotaxin expression and airway inflammation in mouse models of asthma

Objective To observe the influence of STAT6 decoy Oligonucleotides on the Eotaxin expression and airway inflammation in mouse models of asthma.Methods BALB-C female mice were randomly divided into four groups:normal control(N),asthma model(A),asthma model administered by STAT6 decoy Oligonucleotides(ST-ODN),and asthma model administered by scrambled Oligonucleotides(SC-ODN).The STAT6 decoy ODN and scrambled ODN were intranasally administered respectively.The distribution of FITC-ODN in lungs were directly o...