INDUCTION OF INTESTINAL METAPLASIA AND DYSPLASIA IN MONGOLIAN GERBILS INFECTED WITH HELICOBACTER PYLORI / 解放军医学杂志

ABSTRACT

Objective Using a model of H.pylori infected Mongolian gerbil , we observed the effect of H.pylori and N methyl N’ nitro N nitrosoguanidine (MNNG) on gastric mucosa, in an attempt to clarify the potential role of vitamin C in the prevention of gastric carcinoma. Methods A total of 160 Mongolian gerbils , eight week old, were randomly divided into five groups(each 32 animals): Group A, infected with H.pylori ; Group B, infected with H.pylori followed by MNNG administration; Group C, received MNNG without H.pylori infection; Group D, infected with H pylori followed by administration of MNNG and vitamin C; Group E as control. Eight animals from each group were killed at 12, 24, 36, 48 weeks, and histopathological changes in their stomachs were examined for chronic gastritis, intestinal metaplasia, atypical hyperplasia and adenoma. Results The incidences of intestinal metaplasia and dysplasia in groups A and B were significantly higher than those in the other groups( P