沙尘暴PM2.5对大鼠呼吸系统免疫损伤机制研究

目的探讨沙尘暴细颗粒物(PM2.5)染毒对大鼠呼吸系统的炎症免疫损伤情况及其损伤机制。方法将40只正常成年雄性Wistar大鼠随机分为空白对照组和各染毒组低、中、高剂量4个组,每组10只。采用气管直接注入染毒法,分别给大鼠灌注0、1.5、7.5、37.5mg/kg剂量的颗粒物悬浮液。灌注24h后处死大鼠,并对其肺泡灌洗液(BALF)中白细胞介素-1(IL-1)、白细胞介素-6(IL-6)、白细胞介素-8(IL-8)、肿瘤坏死因子(TNF)、白细胞介素-4(IL-4)、白细胞介素-10(IL-10)、白细胞介素-13(IL-13)水平及免疫球蛋白A(IgA)、免疫球蛋白G(IgG)、免疫球蛋白M(IgM)的含量进行检测。结果高剂量组大鼠BALF中IL-1、IL-6、IL-8、TNF水平高于对照组,差异有统计学意义(P<0.05),IL-4、IL-10及IL-13在各剂量组间表达水平差异无统计学意义;高剂量组大鼠BALF中IgG与IgM的含量与对照组比较显著升高(P<0.01),各组IgA含量的变化差异无统计学意义。结论沙尘暴细颗粒物PM2.5可引起大鼠呼吸系统显著的免疫损伤,其中以高剂量的PM2.5染毒对机体的损伤尤为显著,机体暴露于高剂量沙尘暴细颗粒物PM2.5环境可增加呼吸系统疾病发生的危险。

Immunologic injury of respiratory system of rats induced by dust storm PM2.5

Objective To explore how and what the mechanisms of immunologic injury that dust storm PM2.5 to the rats respiratory system through the experiments.Methods Fourty wistar rats were randomly divided into toxicosis groups and control group by intratracheal instillation(n=10).After in stilled 24 hours,and content of interleukin(IL)-1,IL-6,IL-8,tumor necrosis factor(TNF),IL-4,IL-10,IL-13 and immunoglobulin(Ig)A,IgG,IgM in bronchoalveolar lavage fluid(BALF) were detected.Results In group of high dosen areotics,co...