P53Arg72Pro多态性及H. pylori感染与胃癌高发区甘肃河西地区胃癌的关系

Establishment of a mouse model of chronic Helicobacter pylori infection-induced gastric adenocarcinoma and investigation of the effect of Helicobacter pylori infection on angiogenesis

AIM: To investigate the carcinogenicity of long-term Helicobacter pylori (H.pylori) infection in C57BL/6 mice and to investigate the role of angiogenesis in the pathogenesis of H.pylori infection-induced gastric cancer.

METHODS: Eighty male C57BL/6 mice of SPF grade were equally and randomly divided into normal group and model group. The normal group was fed normally, while the model group was inoculated by oral gavage with H.pylori SS1. Mice were sacrificed at weeks 10, 25, 45 and 72 after the last inoculation. H.pylori infection was analyzed by rapid urease test and Giemsa staining. The pathological changes in the gastric mucosa of mice were assessed by hematoxylin-eosin staining. Microvessel density (MVD) was detected by immunohistochemistry.

RESULTS: No H.pylori infection was detected in the gastric antrum, gastric body and duodenal mucosa in the normal group. The rates of H.pylori colonization were 88.9%, 100%, 100% and 100% at weeks 10, 25, 45 and 72 in the model group. At week 72, the incidence rates of chronic gastritis, atrophic gastritis, intestinal metaplasia, dysplasia and gastric cancer were 100%, 88.9%, 77.8%, 33.3% and 22.2% in the model group, respectively. The MVD in the gastric mucosa in the model group was 18.56 ± 2.62, significantly higher than that in the normal group (P < 0.01).

CONCLUSION: A mouse model of chronic H.pylori infection-induced gastric adenocarcinoma has been established successfully. H.pylori infection can increase the MVD in the gastric mucosa in C57BL/6 mice and therefore play an important role in the development of gastric cancer.