钩藤碱固体脂质纳米粒对哮喘小鼠miR-155/p38 MAPK轴的影响

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目的 观察钩藤碱固体脂质纳米粒(Rhy-SLN)对支气管哮喘模型小鼠微小RNA-155(miR-155)/p38丝裂原活化蛋白激酶(p38 MAPK)轴的影响.方法 15只BALB/c小鼠随机均分为正常对照组、模型组和Rhy-SLN组.Rhy-SLN组小鼠行鼻内氢氧化铝致敏操作前以Rhy-SLN(50 mg/kg)灌胃;正常对照组和模型组给予等量生理盐水.干预结束后,肺泡灌洗液涂片观察嗜酸粒细胞的数量;HE染色观察小鼠肺组织病理改变情况;酶联免疫吸附试验(ELISA)法检测小鼠免疫球蛋白E(IgE)、白细胞介素(IL)-13水平;羟脯氨酸测试盒检测小鼠肺组织中羟脯氨酸水平;Werstern blot检测小鼠肺组织(α-SMA)、胶原蛋白Ⅰ(collagenⅠ)、p38 MAPK、p-p38 MAPK蛋白表达水平;荧光定量聚合酶链反应(qPCR)检测小鼠肺组织miR-155 mRNA表达水平.结果 与模型组比较,Rhy-SLN组可以降低哮喘小鼠肺泡灌洗液中嗜酸粒细胞的数目、血清中IgE和肺泡灌洗液中IL-13的水平(P<0.05);减轻肺组织炎性细胞浸润;降低肺组织中α-SMA、collagenⅠ、羟脯氨酸和p-p38 MAPK的表达(P<0.05);上调小鼠肺组织中miR-155的表达水平(P<0.05).结论 Rhy-SLN可缓解小鼠哮喘,其机制可能与调节miR-155/p38 MAPK轴,降低气道的炎症反应有关.
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