Development of gastric adenocarcinoma in mongolian gerbils after long-term infection of Helicobacter pylori
- VernacularTitle:幽门螺杆菌长期感染蒙古沙土鼠建立胃癌模型的研究
- Author:
Qing ZHENG
;
Xiaoyu CHEN
;
Yao SHI
;
Al ET
;
- Publication Type:Journal Article
- Keywords:
Helicobacter pylori;
Mongolian gerbil;
Gastric cancer;
Animal model
- From:
Chinese Journal of Digestion
2001;0(02):-
- CountryChina
- Language:Chinese
-
Abstract:
Objective The experimental evidences that long term colonization of H. pylori results in development of gastric cancer in Mongolian gerbils (MGs) have been reported only by two Japanese groups so far. This study aimed to investigate the carcinogenicity of long term H. pylori infection in MGs model. Methods Thirty six 6 week old outbred MGs (from Inner Mongolia, male∶female=1∶1) were orally inoculated with H.pylori ATCC43504 or H.pylori 161, which was isolated from a patient with gastric adenocarcinoma in our hospital. Another 10 MGs were inoculated with sterilized PBS served as controls. The animals were sacrificed 8, 20, 28 and 84 weeks, respectively, after inoculation for bacteria and histological examination. Results H.pylori was detected in 80%(23/29)of the inoculated MGs and the chronic active gastritis aggravated gradually during the course of experiment. At the 84th week, moderate to severe gastritis, characterized by diffuse infiltration of mononuclear cells and formation of multiple lymphoid follicles in the mucosa and submucosa, and even the lymphocytic epithelial lesions were observed. Atrophy and intestinal metaplasia were less common. The lesions of hyperplasia were dominating in almost all MGs, 24%(4/17)of the animals occurred hyperplastic polyps. Well differentiated gastric adenocarcinomas were developed in 18% (3/17) of the MGs by the end of the 84th week (1 infected with H.pylori 161 and 2 with H.pylori ATCC43504, two of them were female MGs). Conclusions The results reconfirm that H.pylori infection alone can cause gastric adenocarcinoma in MGs. It is suggested that different species of MGs and various strains of H.pylori can be utilized for carcinogenesis research. It is the first report of the development of gastric cancer in female MGs, which might make sense of investigation on the host susceptibility influenced by gender.
