肠瑞灌肠剂对放射性直肠炎大鼠IL-1β及NF-κB表达的影响

目的 观察肠瑞灌肠剂对直线加速器诱导的放射性直肠炎大鼠直肠黏膜IL-1β和NF-κB表达的影响,探讨其黏膜修复作用及抗炎机制.方法 利用直线加速器单次大剂量盆腔局部照射,建立放射性直肠炎大鼠模型.70只大鼠随机分为7组,三个治疗组分别给予高、中、低不同剂量肠瑞灌肠剂,西药对照组给予地塞米松+庆大霉素,中药对照组给予八味锡类散,模型组与空白组给予生理盐水,给药途径均保留灌肠.观察治疗1周后处死全部动物.分别用RT-PCR方法、免疫组织化学方法检测直肠黏膜IL-1β mRNA、NF-κB表达,进行统计学处理.结果 照射后直肠黏膜出现IL-1β mRNA及NF-κB表达,治疗组IL-1β mRNA表达及NF-κB表达显著减少,与模型组、中西药对照组比较差异有统计学意义(P<0.05).治疗高剂量组优于低剂量组.结论 肠瑞灌肠剂能下调放射性直肠炎大鼠直肠黏膜IL-1β mRNA及NF-κB表达,以炎症因子为药物靶点,减轻放射性直肠炎炎症反应,促进肠黏膜修复.

Effects of Changrui Enemas on expression of IL-1β and NF-κB in radiation-induced proctitis rats

Objective To observe the effects of Changrui Enemas on IL-1β and NF-κB in the rat model of radiation-induced proctitis, and to explore the mechanism of its repairing mucous membrane and diminishing inflammation. Methods Radiation was given on the pelvis of rats through linear accelerator to establish the model of proctitis. 70 rats were divided into seven groups randomly. Small dose (0.4 g/ml), middle dose(0.8 g/ml) and large dose(1.6 g/ml) of Changrui Enemas by retention enema were given for 7 days, with the admixture liquids of Gentamyein and Dexamethasone, Xilei Powder was used as controls. Changes of IL-1β and NF-κB expression were investigated by semi-quantitative RT-PCR and IHC respectively. Results The expression of IL-1β and NF-κB were determined in the groups accepted radiation, but there had been a dramatic decline in the treatment groups(P<0.05). The high dose treatment group was superior to the low dose one on the whole. Conclusion Changrui Enemas can down-regulate the expression of inflammatory factor IL-1β and NF-κB on radiation induced proctitis rats, and reduce the inflammatory reaction, protect the rectal mucosa, accelerate healing up of the ulcer and relief the symptoms.