OBJECTIVE:To study the protective effects of Polygonum hydropiper extract on acute gastric mucosal lesion (AGML)in rats. METHODS:48 rats were randomly divided into normal group(normal saline),model group(normal saline), positive group(ranitidine hydrochloride,0.05 g/kg),P. hydropiper extract low-dose,medium-dose and high-dose groups(2.7, 8.1,24.3 g/kg by crude drug),i.g. for consecutive 7 d,once a day. Except for normal group,other groups were given absolute ethyl alcohol to induce AGMI model after 1 h of last administration. 1.5 h after modeling,gastric mucosal lesion index of rats was calculated;the pathological changes of gastric tissue in rats were observed;nuclear factor E2 related factor 2(Nrf2)content and SOD activity in gastric tissue of rats were determined by ELISA. RESULTS:Compared with normal group,the gastric mucosa of model group was damaged obviously,there was blood capillary rupture in submucosa,gastric mucosal lesion index was increased significantly(P<0.01);Nrf2 content and SOD activity were significantly decreased in gastric tissue of rats(P<0.05 or P<0.01). Compared with model group,gastric mucosal lesion of rats was relieved to different extent;in positive group,P. hydropiper extract medium-dose and high-dose groups,gastric mucosal lesion index was decreased significantly(P<0.05),and Nrf2 content and SOD activity were increased significantly(P<0.05 or P<0.01). CONCLUSIONS:P. hydropiper extract has good protective effect on absolute ethyl alcohol-induce AGMI,the mechanism of which may be associated with raising Nrf2 content and enhancing SOD activity in gastric mucosal tissue.

Objective:To study the effects of the secondary metabolites of Rhizotonia leguminicola on cyclophosphamide-induced immunoregulation in immunosuppressed mice.Methods:The immunosuppressed mouse model was established by cyclophosphamide(80 mg/kg) injected into abdominal cavity.The diluent of secondary metabolites of Rhizotonia leguminicola(SW) at the dosage of 8,16 and 32 mg/(kg?d) was intragastrically administered for 11 days respectively.Meanwhile,the normal control group and CTX model control group were established.Blood,thymus and spleen of the mice were collected respectively at 24 h after the last intragastric administration,and the immunological detection was also carried out.Results:CTX was injected constantly into the abdominal cavity at 80 mg/kg for 3 d,which leaded to immunosuppression of the mice.The groups which took SW at 8 and 16 mg/(kg?d) could increase the number of WBC of the mice.Cyclophosphamide induced a decrease of phagocytic activity of the peritoneal macrophages in the mice and a boost of hemolysin level of the peripheral blood,lymphocyte transformation of the spleens and the activity of NK cells,which were especially obvious in the group of SW at 16 mg/(kg?d).Conclusion:The secondary metabolites of Rhizotonia leguminicola have effects of recovery and reinforcement in cyclophosphamide-induced immunoregulation of immunosuppressed mice.