Intestinal anti-inflammatory effect of the rhizome extracts of Menispermum dauricum DC. on trinitrobenzene sulfonic acid induced ulcerative colitis in mice

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• 作者：Qi Su^a ; ^b ; Jiao He^a ; ^b ; ^{hejiao@nwu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Ziye Wang^a ; ^b ; Le Lv^a ; ^b ; Yuan Suo^a ; ^b ; Jingjing Wang^a ; ^b ; Zongwei Zheng^a ; ^b ; Chuanchuan Huo^a ; ^b ; Jing Li^a ; ^b
• 关键词：ANOVA ; one-way analysis of variance ; CD ; Crohn's disease ; COX-2 ; cyclooxygenase-2 ; ELISA ; enzyme-linked immunosorbent assay ; IBD ; Inflammatory bowel disease ; IFN-γ ; interferon-γ ; IL ; interleukin ; iNOS ; inducible nitric oxide synthase ; MPO ; myeloperoxidase ; SASP ; sulfasalazine ; SEM ; standard error of mean ; TNBS ; trinitrobenzene sulfonic acid ; TNF-α ; tumor necrosis factor-α ; UC ; ulcerative colitis
• 刊名：Journal of Ethnopharmacology
• 出版年：2016
• 出版时间：4 December 2016
• 年：2016
• 卷：193
• 期：Complete
• 页码：12-20
• 全文大小：3483 K

文摘

Menispermum dauricum DC., commonly known as “Bei Dou Gen” (BDG) in China, has been used extensively in folk medicine to treat inflammatory diseases, especially intestinal inflammations such as enteritis and dysentery, and in pharyngitis, tonsillitis, rheumatism and bronchitis. Although previous studies showed that BDG has anti-inflammatory activities, its effects on ulcerative colitis (UC) have not yet been explored.

Aim of the study

To investigate the intestinal anti-inflammatory effect of the rhizome extracts of Menispermum dauricum DC. on UC model induced by 2,4,6-trinitrobenzene sulfonic acid (TNBS) in mice.

Materials and methods

UC in mice was induced by colonic administration with TNBS. BDG (100, 200 and 400 mg/kg/day) and sulfasalazine (500 mg/kg/day) were administered orally for 7 consecutive days. The inflammatory degree was assessed by gross appearance, macroscopic and histological analysis, and accumulation of myeloperoxidase (MPO) activity. Pro-inflammatory mediators, including tumor necrosis factor (TNF)-α, interleukin (IL)-1β and IL-6, were determined by enzyme-linked immunoassay. The expression of cyclooxygenase (COX)-2 was assessed by immunohistochemical analysis.

Results

Treatment with different doses of BDG significantly ameliorated macroscopic damage and histological changes, reduced the accumulation of MPO activity, depressed serum and colonic tissue levels of TNF-α, IL-1β and IL-6 in a dose-dependent manner. In addition, administration of BDG effectively reduced COX-2 overexpression in colon.

Conclusion

We demonstrated for the first time that BDG possessed marked intestinal anti-inflammatory effect in TNBS induced colitis in mice, which might be related to the reduction of up-regulated productions and expressions of pro-inflammatory mediators, suggesting that it may have beneficial use for the treatment of inflammatory bowel disease.