摘要
背景:白芍总苷(TGP)具有抗炎、免疫调节等作用,其对炎症性肠病是否具有治疗作用尚不清楚。目的:探讨TGP对大鼠实验性结肠炎的影响及其可能机制。方法:50只大鼠以三硝基苯磺酸(TNBS)/乙醇溶液灌肠诱导结肠炎模型,分为结肠炎模型组、低、中、高剂量TGP组(25、50、100mg/kgTGP)和阳性药物对照组(100mg/kg奥沙拉秦)。10只大鼠作为正常对照组(0.9%NaCl溶液灌肠)。实验期间评估各组疾病活动指数(DAI);干预2周后行结肠大体损伤指数(CMDI)和组织学损伤指数(TDI)评分,以酶联免疫吸附测定(ELISA)检测血清肿瘤坏死因子-α(TNF-α)和白细胞介素-10(IL-1O)水平,以免疫组化方法检测结肠组织磷酸化p38丝裂原活化蛋白激酶(p—p38MAPK)表达。结果:与结肠炎模型组相比,高剂量TGP组实验期间DAI均值显著降低(P<0.01);中、高剂量TGP组CMDI和TDI显著降低,血清TNF-α水平降低,IL-10水平升高,结肠组织p-p38MAPK表达降低(P<0.05)。高剂量TGP的疗效与奥沙拉秦无明显差异。结论:TGP可能通过抑制p38MAPK激活,抑制TNF-α分泌,促进IL—10分泌,改善免疫调节紊乱,从而减轻TNBS诱导的大鼠实验性结肠炎的症状和结肠炎性损伤。
Background:The total glucosides of paeony (TGP) have the function of anti-inflammation and immunoregulation, but its therapeutic effect on inflammatory bowel disease is still uncertain. Aims: To investigate the effect of TGP on experimental colitis in rats and its potential mechanism. Methods: Colitis model was induced in 50 rats by rectal administration of trinitrobenzene sulfonie acid (TNBS) dissolved in ethanol. Ten model rats each were treated with 25, 50 and 100 mg/kg TGP, respectively, 10 model rats served as model control group, and 10 model rats were treated with 100 mg/kg olsalazine as drug controls. Other 10 rats receiving 0.9% NaCl solution served as normal controls. Disease activity index (DAI) was evaluated during the intervention. After 2-week intervention, the colonic macroscopic damage index (CMDI) and tissue damage index (TDI) were evaluated, the serum levels of tumor necrosis factor-or (TNF-α) and interleukin-10 (IL-10) were determined by enzyme-linked immunosorbent assay (ELISA), and the colonic expression of phosphorylated p38 mitogen-activated protein kinase (p-p38MAPK) was determined by immunohistochemical method.Results: Compared with model control group, DAI in high-dose TGP group during the intervention decreased significantly (P〈0.01); CMDI and TDI, as well as the serum level of TNF-α and the colonic expression of p-p38MAPK in moderate- and high-dose TGP groups decreased significantly, while the serum level of IL-10 increased significantly (P〈0.05). No statistically significant differences were found between high-dose TGP group and olsalazine group. Conclusions: TGP can attenuate the symptoms and colonic inflammatory damage of TNBS-induced experimental colitis in rats. The mechanism may be related to the inhibition of p38MAPK activation, down-regulation of TNF-α, up-regulation of IL-10 and improvement of immunoregulation.
出处
《胃肠病学》
2009年第3期154-158,共5页
Chinese Journal of Gastroenterology