Anti-inflammatory effects of Fagopyrum cymosum administered as a potential drug for ulcerative colitis.

Fagopyrum cymosum (Trev.) Meisn (Fag), which belongs to the Polygonaceae family, has been widely used to treat inflammatory diseases. Previous studies have revealed that Fag components exhibit anti-inflammatory activities; however, their potential use in treating inflammatory bowel disease (IBD) has not been explored. In the present study, mice with 2,4,6-trinitrobenzenesulfonic acid (TNBS)-induced colitis were used as a model of IBD. Fag extract was orally administered for 3 days following the induction of colitis and the conventional drug, salicylazosulfapyridine (SASP), was used as a control. The results revealed that Fag significantly ameliorated TNBS-induced body weight loss and colonic shortening in mice (P<0.05). Furthermore, Fag suppressed levels of proinflammatory cytokines and reduced macrophage infiltration into colonic tissues (P<0.05). To further verify the anti-inflammatory effects of Fag at the molecular level, a murine macrophage cell line, Raw264.7, was used. Nuclear translocation of nuclear factor (NF)-kappa B p65 and the phosphorylation of inhibitor of NF-kappa B (I kappa B) were assessed using western blotting. The results demonstrated that Fag inhibited the production of proinflammatory cytokines via inhibiting NF-kappa B p65 nuclear translocation and I kappa B phosphorylation (P<0.05). Furthermore, the clinical study results revealed that Fag had significantly fewer side effects (P<0.05) and served as a better anti-inflammatory drug for ulcerative colitis compared with SASP.