【摘 要】
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目的 探讨香烟烟雾暴露对支气管哮喘(简称哮喘)大鼠CD4+CD25+调节性T细胞(Treg)数量及转录因子Foxp3表达的影响.方法 将40只雄性Wistar大鼠按随机数字表法分为生理盐水组、烟
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目的 探讨香烟烟雾暴露对支气管哮喘(简称哮喘)大鼠CD4+CD25+调节性T细胞(Treg)数量及转录因子Foxp3表达的影响.方法 将40只雄性Wistar大鼠按随机数字表法分为生理盐水组、烟雾暴露组、哮喘组和哮喘+烟雾暴露组,每组10只;哮喘组采用卵清白蛋白(OVA)致敏并吸入激发制备哮喘模型,生理盐水组雾化生理盐水,烟雾暴露组采用吸入香烟烟雾,哮喘+烟雾暴露组于每日雾化激发OVA前给予香烟烟雾吸入.流式细胞仪检测外周血CD4+ CD25+Treg细胞占CD4+T细胞的比例,酶联免疫吸附试验(ELISA)检测外周血和肺组织γ干扰素(INF-γ)以及白细胞介素4(IL-4)含量;Western blot检测肺组织Foxp3蛋白表达水平.结果 (1)哮喘组大鼠CD4+CD25+Treg为(6.4±1.0)%,低于生理盐水组的(9.9±1.0)%,差异有统计学意义(F=92.59,P＜0.01);哮喘+烟雾暴露组为(3.3±0.8)%,低于生理盐水组和哮喘组,差异有统计学意义(F=92.59,P＜0.01).(2)哮喘组大鼠血浆和肺组织中IL-4含量[(22.6±4.3)ng/L、(0.8±0.1)ng/L]高于生理盐水组[(11.4±2.9)ng/L、(0.3±0.1)ng/L],差异有统计学意义(F值分别31.69和49.29,P＜0.01);哮喘+烟雾暴露组血浆和肺组织中IL-4含量[(34.1±6.1)ng/L、(1.4±0.3)ng/L]高于生理盐水组和哮喘组,差异有统计学意义(F值分别为31.69和49.29,P＜0.05);哮喘组血浆中INF-γ含量[(59±20)ng/L]低于生理盐水组[(151±56)ng/L],差异有统计学意义(F=21.83,P＜0.05),哮喘+烟雾暴露组INF-γ含量[(10±3)ng/L]低于生理盐水组和哮喘组,差异有统计学意义(F=21.83,P＜0.05).(3)哮喘组Foxp3蛋白表达为8.18±0.26,低于生理盐水组的10.27±0.33(F=43.33,P＜0.01);哮喘+烟雾暴露组为6.36±0.38,低于生理盐水组和哮喘组(F=43.33,P＜0.05).结论 香烟烟雾暴露可能通过下调CD4+CD25+Treg数量并抑制Foxp3蛋白表达,进一步加重哮喘的Th1/Th2失衡.
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