AIM: To determine the roles of H. pylori concentrated culture supernatants (CCS) on the gastric mucosa of mouse and to investigate the protective effects of gastric mucosal protectives sucrafate and sanjiuweitai on CCS-induced gastric mucosal lesion in Balb/c rats.
METHODS: Fifty-six healthy male Balb/c rats were randomly divided into seven groups: normal saline control (Ⅰ), injured simply (ⅡA, ⅡB), sucrafate pretreatment (ⅡA, ⅡB), sanjiuweitai pretreatment (ⅡA, ⅡB). Group A was dealt with small amounts of CCS and group B with large amounts of CCS. CCS were drawn from cytotoxic H. pylori strain (NCTC11637). The four protective groups were pretreated with sucrafate and sanjiuweitai separately, and then infused orally with different amounts of CCS. The pathological changes on histological sections and ultrastructural sections of gastric mucosa were assessed under microscope or electron microscope. The epithelial damage scoring (EDS) of the gastric mucosa was measured.
RESULTS: The management with large amounts of CCS from cytotoxic strains induced various epithelial lesions, which included vacuolation, erosions, ulcers and loss of gastric gland architecture. Infiltration of inflammatory cells in the lamina propria was not significant. At ultrastructural level, there was the presence of intracytoplasmic vacuoles, dilation of endoplasmic reticulum and mitochondrion, increasing of phagolysosomes, loose connection between cells and degenerative changes of microvilli. Small amounts of CCS from cytotoxic strain induced epithelial lesions less seriousey than large amounts of CCS. The results of the EDS of the gastric mucosa in the groups Ⅰ, ⅡA, ⅡB, ⅢA, ⅢB, ⅣA and ⅣB arranged successively as follows, 1.13±0.35, 2.25±0.46, 3.63±0.52, 1.25±0.46, 1.75±0.71, 1.50±0.53 and 1.63±0.74 respectively. A remarkable protection was found in gastric mucosa pretreated with sucrafate and sanjiuweitai. In comparison with the purely injured group, the EDS of the gastric mucosa descended significantly (P<0.05).
CONCLUSION: Cytotoxin has an important role in the induction of gastric mucosa lesions, but not in eliciting obvious inflammation; The gastric mucosal protection of sucrafate and sanjiuweitai against CCS-induced gastric mucosal lesion in rats is significant.