冷束缚应激对变应性鼻炎大鼠鼻黏膜中嗜酸粒细胞及白细胞介素2和6表达的影响

目的 探讨冷束缚应激对实验大鼠变应性鼻炎(allergic rhinitis,AR)模型鼻黏膜中嗜酸粒细胞及白细胞介素(interleukin,IL)2和IL-6表达的影响.方法 选健康雌性大鼠50只,以随机数学表法分为5组,每组10只:空白对照组(A组)、AR模型组(B组)、先应激后AR造模组(C组)、先AR造模后应激组(D组)、应激与AR造模同时进行组(E组).空白对照组及各实验组造模后,取大鼠鼻中隔两侧的呼吸区黏膜制备成石蜡切片后进行HE染色及IL-2、IL-6免疫组织化学染色,显微镜下利用图像分析系统,取5个视野嗜酸粒细胞、IL-2、IL-6阳性细胞计数的平均值进行分析.结果 经冷束缚应激后的C、D、E组大鼠鼻黏膜中嗜酸粒细胞计数(x-±s,以下同)高于B组(14.1±3.2)及A组(2.3±1.4),差异有统计学意义(F值分别为7.06和8.54,P值分别＜0.05和0.01);C、D、E组IL-6阳性细胞数高于B组(15.3±4.8)及A组(4.9±2.4),差异有统计学意义(F值分别为7.14和8.20,P值分别＜0.05和0.01);C、D、E组IL-2阳性细胞数低于B组(14.4±3.5)及A组(15.4±4.1),差异有统计学意义(F值分别为7.27和7.32,P值分别＜0.05和0.01).C、D、E三组间,嗜酸粒细胞计数、IL-2和IL-6阳性细胞数3项指标差异均无统计学意义(F值分别为2.90、3.12、3.20,P值均＞0.05).结论 鼻黏膜组织中嗜酸粒细胞及IL-6在空白对照组几乎不表达,在AR组中度表达,在经过冷束缚应激的AR大鼠中高度表达,且冷束缚应激与AR造模的先后时间顺序对嗜酸粒细胞及IL-6的表达没有影响.冷束缚应激的AR各组大鼠鼻黏膜组织中IL-2表达明显减少.

Effects of cool restrain stress on eosinophils and interleukin 2 and 6 in nasal mucosa of rats with allergic rhinitis

Objective To study the effects of cool restrain stress on the accumulation of eosinophils and expression of Th cytokines in rat nasal mucosa with allergic rhinitis model.Methods Fifty healthy female rats were randomly divided into 5 groups:control group,allergic rhinitis(AR)group,AR plus stress group,stress plus AR group and simultaneous stress-AR group.Cool restrain stress,AR model and simultaneous stress-AR were made.Nasal mucosa of septum from rats of five groups were stained routinely by haematoxylin eosin(HE)and immunohistochemistry respectively.The density of eosinophils and expression of interleukin(IL)2,IL-6 were observed by using software of image analysis systems under microscope.Results The density of eosinophiles and IL-6 in the nasal mucosa of stress-AR group were significantly higher than those in AR(14.1 ± 3.2)for eosinophiles,and(15.3 ± 4.8)for IL-6]and were also significantly higher than those in control groups(2.3 ±1.4)for eosinophiles,and(4.9 ±2.4)for IL-6)],and the differences reached statistical significance.(F were respectively 7.06,7.14,8.54,8.20,P were respectively＜0.05 or＜0.01),but no significant differences of the three groups(AR plus stress,stress plus AR and simultaneous stress-AR groups)were found(F were respectivel 2.90 and 3.20,P＞0.05).The expression of IL-2 in nasal mucosa of stress-AR group was significantly reduced compared with AR and control groups(F were respectively 7.27,7.32,P were respectively＜0.05 or＜0.01).But there were also no significant differences of the three groups(AR plus stress,stress plus AR and simultaneous stress-AR groups,F=3.12,P＞0.05).Conclusions The abnormal infiltration and accumulation of eosinophiles and the differences in expression of IL-2 and IL-6 which represented Th1 and Th2 cytokines in rats nasal mucosa varied in different groups.The eosinophiles and IL-6 were rarely expressed in control group and moderately expressed in AR group,but significantly expressed in cool restrain groups.The IL-2 representing Th1 cytokines were reduced in cool restrain stress gruops.All these results indicated that cool restrain stress might play a role in inducing rat allergic rhinitis.