Extractive from Rauvolfia verticillata (Lour.) Baill. var. hainanensis Tsiang ameliorate ulcerative colitis in Dextran Sodium Sulfate-induced Mice via regulating the MAPK pathway

Objective: To investigate the effect and mechanism of Rauwolfia verticillata (Lour.) Baill. var. hainanensis Tsiang extract on mice with colitis induced by Dextran sulphate sodium (DSS). Methods: 80 BALB/C mice were randomly divided into (1) normal control group, (2) DSS group, (3) DSS + SASP treatment group, (4) DSS + PP treatment group. After the experiment, the mice in each group were observed daily general conditions, Immunohistochemistry was used to detect the expression of ERK, p38 MAPK and JNK protein in colonic mucosa of mice in each group. The expression of TNF-_and IL-6 cytokines in colonic tissue of mice was detected by ELASA. Results: The general situation of SASP group and PP group was better than DSS group;Compared with DSS group, the expression of ERK, p38 MAPK and JNK protein was significantly decreased. The levels of TNF-a and IL-6 in colon tissue of SASP group and PP group were significantly decreased. Conclusion: The results suggest that pectin polysaccharide from Rauvolfia hainanensis extract has a significant therapeutic effect on colitis in DSS mice, which may via regulating the MAPK signal pathway pathways.

海南萝芙木提取物对DSS小鼠结肠炎MAPK信号通路的影响

目的:探讨海南萝芙木(Rauvolfia verticillata(Lour.)Baill.var.hainanensis Tsiang)提取物果胶多糖(pectic polysaccharides,PP)对葡聚糖硫酸钠(dextran sulphatesodium,DSS)小鼠结肠炎的作用及机制。方法:80只BALB/C小鼠随机分为4组:(1)正常对照组;(2)DSS组;(3)DSS+柳氮磺胺吡啶(SASP)治疗组;(4)DSS+PP治疗组。实验结束后,观察各组小鼠每日一般情况。剖取各组小鼠结肠炎症组织,免疫组织化学检测法检测各组小鼠结肠黏膜组织中丝裂原活化蛋白激酶信号通路的关键酶细胞外调节蛋白激酶(ERK)、P38丝裂原活化蛋白激酶(p38 MAPK)和c-Jun基末端激酶(JNK)蛋白表达情况,酶联免疫吸附实验(ELISA)方法检测定小鼠结肠组织肿瘤坏死因子α(TNF-ɑ)、白介素-6(IL-6)细胞因子表达情况。结果:SASP治疗组和PP治疗组小鼠一般情况优于DSS组;与DSS组相比,ERK、p38 MAPK和JNK蛋白表达明显下调;SASP治疗组和PP治疗组结肠组织中TNF-α、IL-6水平均显著降低。结论:提示海南萝芙木提取物果胶多糖对DSS小鼠结肠炎有显著治疗作用,其可能是通过干预MAPK信号通路发挥此作用。