秦皮甲素对实验性溃疡性结肠炎大鼠肠黏膜细胞因子的影响

摘要

Objective To study the preventive effect and mechanism of aesculin on intestinal mucosa in rats with experimental ulcerative colitis (UC) . Methods Forty specific-pathogen free SD rats were randomly divided into normal group, model group, salicylazosulfapyridine (SASP, 600 mg/kg) group and aesculin (EH, 100 mg/kg) group, 10 in each group. Rats in model group, SASP group and EH group were given enema with trinitrobenzene sulfonic acid ( TNBS, 100 mg/kg) for the establishment of UC model. The rats in SASP group and EH group were given gastric gavage of SASP and aesculin respectively. At the end of experiment, the serum levels of tumor necrosis factor alpha ( TNF-α) and interleukin 10 ( IL-10) were detected by enzyme-linked immunosorbent assay (ELISA) . The general state, histological features of intestinal mucosa and serum TNF-αand IL-10 levels of rats in each group were compared. Results Aesculin significantly improved the general state and relieved the inflammation of the colonic mucosa of UC rats. The disease activity index ( DAI) scores and tissue damage index (TDI) scores in the model group were significantly higher than those in the normal group ( P<0.01) . The DAI scores and TDI scores in the medication groups were significantly lower than those in the model group (P<0.01) . The serum TNF-αlevel was significantly higher and IL-10 level was significantly lower in the model group than the normal group ( P<0.01) . After treatment, TNF-α was decreased and IL-10 was increased in SASP group and EH group as compared with the model group (P<0.01) . Conclusion Aesculin has certain therapeutic effect on TNBS-induced UC in rats through significantly relieving the symptoms of UC rats. The mechanism may be related with the inhibition of TNF-α secretion and the increase of IL-10 expression, and then improving the disorder of intestinal immune function.%目的研究秦皮甲素对实验性溃疡性结肠炎（ulcerative colitis， UC）大鼠肠黏膜的保护作用及其机制。方法选用40只SPF级SD大鼠随机分为正常组、模型组、柳氮磺胺吡啶组（SASP组）和秦皮甲素组（EH组），每组10只。模型组、SASP组和EH组均采用三硝基苯磺酸（TNBS，剂量为100 mg／kg）灌肠法复制大鼠UC模型， SASP组和EH组分别灌胃给予SASP (剂量为600 mg／kg）和秦皮甲素(剂量为100 mg／kg）进行治疗。治疗结束后，采用酶联免疫吸附（ELISA）法检测各组大鼠血清中肿瘤坏死因子-α（TNF-α）和白细胞介素-10（IL-10）的水平。比较各组大鼠一般状态、肠黏膜损伤情况和血清TNF-α、 IL-10水平。结果秦皮甲素能显著改善UC大鼠的一般状态，显著缓解其结肠组织炎症。模型组大鼠结肠黏膜疾病活动指数（DAI）评分和组织学损伤指数（TDI）评分较正常组显著增高(P<0.01)，各给药组DAI评分和TDI评分较模型组显著降低（P<0.01）。模型组大鼠血清中TNF-α水平显著升高， IL-10水平显著降低（均P<0.01）。与模型组比较， SASP组和EH组TNF-α水平显著降低， IL-10水平显著增高（均P<0.01）。结论秦皮甲素对TNBS诱导的大鼠UC有良好的治疗作用，其作用可能是通过抑制TNF-α分泌，上调IL-10表达，改善肠道免疫平衡紊乱而实现的。