IL-18对分泌性中耳炎模型大鼠中耳IFN-γ和IL-4表达的影响

The Effects of interleukin-18 on Middle Ear Inflammation in the Rat Model of Otitis Media with Effusion

刘华;赵守琴;高占梅;范尔钟;李洁;宋扬;

1:河北医科大附属唐山市工人医院耳鼻喉科

2:首都医科大学附属北京同仁医院耳鼻咽喉头颈外科

3:北京市耳鼻咽喉科研究所基础部

4:首都医科大学附属北京复兴医院

摘要
目的探讨白细胞介素18(interleukin 18,IL-18)对分泌性中耳炎(otitis media with effusion,OME)模型大鼠中耳炎症细胞的增殖情况以及干扰素γ(interferonγ,IFN-γ)和白细胞介素4(interleukin 4,IL-4)表达的影响。方法 18只SD大鼠随机分为对照组(A组)、OME模型组(B组)和IL-18注射组(C组),每组各6只(12耳),B组和C组采用卵清蛋白(ovalbumin,OVA)腹腔注射致敏后耳内激发制成OME模型,C组于OVA全身致敏及耳内激发的同时,在实验第1、2、7、8、15、16d进行腹腔注射IL-18 1μg加生理盐水0.2ml,A组和B组在相同时间点腹腔注射生理盐水0.2ml。HE染色观察各组中耳黏膜病理变化及炎症细胞的改变,ELISA法测定各组大鼠中耳腔灌洗液中T辅助细胞(T helper cell,Th)分泌Th2型细胞因子-IL-4和Th1型细胞因子-IFN-γ的含量。结果 C组大鼠中耳黏膜组织炎症反应较B组无明显减轻,中耳黏膜下层和骨髓腔中中性粒细胞数量较B组显著增多(P<0.05),嗜酸粒细胞数量与B组比较稍减少(P>0.05),但仍明显多于A组(P<0.05);C组中耳灌洗液Th1型细胞因子IFN-γ含量明显高于B组与A组(P<0.05),Th2型细胞因子IL-4含量较B组稍有增高(P>0.05);但B组和C组IL-4含量均明显高于A组(P<0.05);A、C组Th1/Th2比值虽高于B组,但差异无统计学意义(P>0.05)。结论 IL-18诱导OME模型大鼠中耳微环境中IFN-γ合成显著增高,虽然一定程度上缓解了OME大鼠中耳Th1/Th2失衡状态,但是仍存在以Th细胞过度活化、Th1和Th2型细胞因子过度分泌的免疫反应紊乱状态。
关键词
白细胞介素18;分泌性中耳炎;T辅助细胞;细胞因子;大鼠
基金项目(Foundation):
作者
刘华;赵守琴;高占梅;范尔钟;李洁;宋扬;
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