Objective:To observe the influence of wogonin on colitis mice induced by dextran sulfate sodium (DSS) and explore the related mechanism.Methods:Eighteen C57BL/6 mice were randomly and equally divided into the control group, the model group and the treatment group. The water was given normally to mice in control group, and the 2.5% DSS drinking water was given to mice of other two groups for 7 days. Wogonin via intraperitoneal injection was administrated in the mice of treatment group on the second and the fourth day. The mice were sacrificed on the eighth day and specimens were collected. The pathological damage and inflammation degree of mice colon were evaluated by measuring the length of colon and using HE staining. Immunofluorescence was used to detect the infiltration of neutrophils in mice colon tissue. Wogonin of 25, 50, 100 μmol/L was applied to handle neutrophils from mice marrow tissue in vitro, and there was no treatment in the negative control group. The flow cytometry was used to detect the apoptosis of neutrophil. Western blot was used to detect the expressions of anti-apoptotic protein myeloid cell leukelia-1 (Mcl-1) and extracellular signal-regulated kinase (ERK) . Results:Compared with the model group, the mice colon length in the treatment group was significantly longer [ (7.80 ± 0.21) cm vs. (6.43 ± 0.10) cm, P<0.01], the pathological damage score of the colon tissue was significantly lower [ (6.83 ± 0.98) points vs. (14.33 ± 1.03) points, P<0.01], the number of infiltrative neutrophils in the colon of mice was significantly lower [ (8.52 ± 0.15) neutrophils per low power field vs. (29.43 ± 0.43) neutrophils per low power field, P<0.01]. The apoptosis rate of neutrophils were 6.41% ± 0.51%, 14.01% ± 0.81%, 20.89% ± 0.82%, 24.23% ± 0.29% in negative control group and 25, 50, 100 μmol/L wogonin groups. The apotosis rate of neutrophils increased constantly with the concentration of wogonin increasing gradually and there were significant differences among any two groups ( P<0.01) . Compared with the negative control group, the phosphorylated ERK expressions of neutrophils in 25, 50, 100 μmol/L wogonin groups were decreased obviously (all P<0.05) . The Mcl-1 expression of neutrophils declined constantly with the concentration of wogonin increasing gradually. Conclusion:Wogonin can induce the apoptosis of neutrophils in concentration-dependent manner, reduce the infiltration of neutrophils and relieve the intestinal damage in colon tissue of colitis mice, which may be regulated by the inhibition of ERK phosphorylation and decreased expression of Mcl-1 in concentration-dependent manner.

Objective:To observe the influence of wogonin on colitis mice induced by dextran sulfate sodium (DSS) and explore the related mechanism.Methods:Eighteen C57BL/6 mice were randomly and equally divided into the control group, the model group and the treatment group. The water was given normally to mice in control group, and the 2.5% DSS drinking water was given to mice of other two groups for 7 days. Wogonin via intraperitoneal injection was administrated in the mice of treatment group on the second and the fourth day. The mice were sacrificed on the eighth day and specimens were collected. The pathological damage and inflammation degree of mice colon were evaluated by measuring the length of colon and using HE staining. Immunofluorescence was used to detect the infiltration of neutrophils in mice colon tissue. Wogonin of 25, 50, 100 μmol/L was applied to handle neutrophils from mice marrow tissue in vitro, and there was no treatment in the negative control group. The flow cytometry was used to detect the apoptosis of neutrophil. Western blot was used to detect the expressions of anti-apoptotic protein myeloid cell leukelia-1 (Mcl-1) and extracellular signal-regulated kinase (ERK) . Results:Compared with the model group, the mice colon length in the treatment group was significantly longer [ (7.80 ± 0.21) cm vs. (6.43 ± 0.10) cm, P<0.01], the pathological damage score of the colon tissue was significantly lower [ (6.83 ± 0.98) points vs. (14.33 ± 1.03) points, P<0.01], the number of infiltrative neutrophils in the colon of mice was significantly lower [ (8.52 ± 0.15) neutrophils per low power field vs. (29.43 ± 0.43) neutrophils per low power field, P<0.01]. The apoptosis rate of neutrophils were 6.41% ± 0.51%, 14.01% ± 0.81%, 20.89% ± 0.82%, 24.23% ± 0.29% in negative control group and 25, 50, 100 μmol/L wogonin groups. The apotosis rate of neutrophils increased constantly with the concentration of wogonin increasing gradually and there were significant differences among any two groups ( P<0.01) . Compared with the negative control group, the phosphorylated ERK expressions of neutrophils in 25, 50, 100 μmol/L wogonin groups were decreased obviously (all P<0.05) . The Mcl-1 expression of neutrophils declined constantly with the concentration of wogonin increasing gradually. Conclusion:Wogonin can induce the apoptosis of neutrophils in concentration-dependent manner, reduce the infiltration of neutrophils and relieve the intestinal damage in colon tissue of colitis mice, which may be regulated by the inhibition of ERK phosphorylation and decreased expression of Mcl-1 in concentration-dependent manner.