Objective: To observe the regulatory effect of 6-Shogaol on Notch signal pathway in colonic epithelial cells of mice with ulcerative colitis.
Methods: Forty Kunming mice were randomly divided into normal group (n=10) and model group (n=30). The model of ulcerative colitis was induced by free drinking of 2% dextran sulfate sodium salt(DSS). After 15 days, the mice were divided into model group, 6-gingerenol group and positive control group with 10 mice in each group. Normal group and model group were treated with normal saline, 6-gingerenol group was treated with 6-Shogaol 100 mg/(kg·d), positive control group was treated with sulfasalazine 100 mg/(kg·d), for 20 days. The histopathological changes of colon were observed, and the expressions of Hes-1 and Math-1protein in colonic epithelial cells were detected by immunofluorescence double labeling method. The expressions of Notch-1, Hes-1 and Math-1 mRNA in colonic epithelial tissue were detected by RT-PCR. The expressions of Notch-1, Hes-1 and Math-1 protein in colonic epithelial tissue was detected by Western blot.
Results: Compared with the normal group, the expression of Notch-1 and Hes-1 protein and the relative expression of mRNA in colonic epithelium of model group were significantly increased (P＜0.01), while the relative expressions of Math-1 mRNA and protein were decreased significantly (P＜0.01). Compared with the model group, the expressions of Notch-1 and Hes-1 protein and the relative expression of mRNA in colonic epithelium of 6-Shogaol group and sulfasalazine group were decreased significantly(P＜0.01), while the relative expressions of Math-1 mRNA and protein were increased significantly(P＜0.01).
Conclusion: 6-Shogaol can inhibit the over activation of Notch pathway and regulate the balance of differentiation between colonic epithelialabsorptive cell line and secretory cell line and repair damaged mucosal tissue.