Electron microscopic study of adhesion between Helicobacter pylori and gastric epithelial cell / 대한내과학회지

BACKGROUND: The purpose of this study was to investigate the ultrastructural relation of H. pylori and gastric epithelial cells in their adhesion. METHODS: Endoscopic biopsy of gastric antrum and body was performed from 15 patients (9 men, 6 women) with chronic gastritis. These specimens were processed and observed by transmission electron microscope (Hitachi H-600). RESULTS: On the basis of morphological appearances, the different types of adhesion of the organism with the epithelial cells were categorized as filamentous connection, adhesion pedestals, membrane fusion. Coccoid and intermediate forms were associated with filamentous connection whereas bacillary forms were associated with adhesion pedestals and membrane fusion. CONCLUSION: Various types of adhesion were associated with H. pylori and gastric epithelium. Further studies are needed to investigate biophysiologic influence to epithelial cells by ultrastructural relationship.(Korean J Med 60:16-21, 2001)

The Role of Endoscopic Ultrasonography in Primary Gastric Lymphoma of MALT / 대한소화기내시경학회지

BACKGROUND AND AIMS: Endoscopic ultrasonography (EUS) is a useful diagnostic method for diagnosing local invasion and lymph node metastasis of primary gastric lymphoma including mucosa-associated lymphoid tissue (MALT) lymphoma, but the role of follow-up EUS after histologic regression of MALT lymphoma has not been well established until now. Therefore the usefulness of EUS in initial and follow up studies after Helicobacter pylori eradication therapy was investigated. METHODS: From January 1995 to October 1998, nineteen MALT lymphoma patients were investigated. All but four patients underwent EUS exam at diagnosis and 3~23 months thereafter. 17 patients recieved H. pylori eradication therapy and 2 patients recieved operations without medical treatment. RESULTS: 16 of the 17 patients (94%) were cured of H. pylori infection after antimicrobial therapy. but on the histologic criteria, 13 of the 16 cases (81%) who were cured of H. pylori infection showed complete regression of MALT lymphoma. Histologic regression of MALT lymphoma was observed 6 weeks to 23 months after H. pylori eradication. In follow up EUS exam, gastric wall abnormalities returned to normal in 9 cases (69%) and remained abnormal in 4 cases (31%) among the completely regressed 13 cases. CONCLUSIONS: Considerable portion (31%) of follow up EUS exam showed persistent abnormalities of gastric wall such as thickening of mucosa and/or submucosa after histologic regression of MALT lymphoma. To evaluate the usefulness of EUS, follow up EUS exam with regular interval for longer periods after histologic regression is needed.