Effect of Yuchang suppository on PPAR γ/NF-KB signaling pathway in rats with ulcerative colitis

摘要

Objective: To investigate the therapeutic effect of Yuchang suppository on experimental ulcerative colitis rats and the effect of PPARγ/NF-KB signaling pathway. Methods: The UC rat model was replicated by 2.4.6-trinitrobenzenesulfonic acid (TNBS)/ethanol method and randomly divided into normal control group, model group, high-dose group of Yuchang suppository, middle dose group , Low-dose group and sulfasalazine group, 8 rats in each group. After 14 days of treatment, the general condition of the rats was observed and the disease activity index was scored. The changes of serum TNF-α, IL-1β and IL-6 levels were detected by ELISA. The colonic mucosal injury index (CMDI) score and colon were observed by colon specimens. Histopathological changes; RT-PCR and Western blot were used to detect the expression of PPARγ and NF-KB genes and proteins in colon tissue. Results: Compared with the normal control group, the DAI and CMDI scores in the model group and the levels of serum TNF-α, IL-1β, IL-6, NF-κB p65 mRNA and protein in colon tissue were significantly increased, PPAR. - γ mRNA and protein expression levels were significantly reduced. The levels of IL-1β, IL-6, TNF-α and the expression of NF-κB p65 mRNA and protein in colon tissue were lower than those in the model group, and the expression levels of PPARγ mRNA and protein were high. In the model group. In the improvement of NF-κBp65 and PPAR-γ gene and protein expression in rat colonic mucosa, the high-dose group and the middle-dose group were significantly better than the low-dose group. Conclusion:Yuchang suppository can significantly improve the symptoms and histopathology of UC model rats. The mechanism may be through activation of PPARγ, blocking the activation of NF-κB signaling pathway, and down-regulating inflammatory factors such as TNF-α and IL-1β. The expression is such that the inflammatory response is alleviated or eliminated, thereby achieving the therapeutic effect of UC.