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Ultrastructural study of Helicobacter pylori-associated gastritis
1Department of Pathology, Jinnah Postgraduate Medical Centre, Karachi, Pakistan.
Abstract:
Endoscopic biopsies of antral mucosa from 26 patients with Helicobacter pylori-associated gastritis were studied by electron microscopy (EM). Scanning electron microscopy (SEM) showed clustering of H. pylori in the intercellular areas, being entrapped by the microvilli which were decreased at the sites where the bacilli were seen. The observations of SEM were confirmed by transmission electron microscopy (TEM), which showed adherence of the bacilli to the cell surface, producing cup-shaped depressions in the epithelial cells, and occasionally intracellular infiltration by H. pylori. There were also depletion of mucus granules, degenerative changes, and disruption of intercellular junction complexes of the epithelial cells. Post-treatment biopsies showed complete disappearance of the bacilli, and ultrastructural changes associated with H. pylori infection were resolved.
Insights
Helicobacter pylori infection damages stomach lining cells, causing gastritis. Treatment eradicates the bacteria, resolving these cellular changes.
Area of Science:
- Gastroenterology
- Microbiology
- Cell Biology
Background:
- Helicobacter pylori is a common cause of gastritis.
- The precise ultrastructural changes induced by H. pylori remain an area of investigation.
Purpose of the Study:
- To investigate the ultrastructural changes in gastric antral mucosa associated with Helicobacter pylori infection using electron microscopy.
- To observe the effects of H. pylori on epithelial cells and mucus layer.
Main Methods:
- Endoscopic biopsies from 26 patients with H. pylori-associated gastritis were analyzed.
- Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) were employed.
Main Results:
- SEM revealed H. pylori clustering in intercellular areas, entrapped by microvilli.
- TEM showed bacterial adherence to cell surfaces, causing cell depressions, and occasional intracellular infiltration.
- Degenerative changes, mucus granule depletion, and disrupted intercellular junctions were observed.
Conclusions:
- H. pylori infection causes significant ultrastructural damage to gastric epithelial cells.
- Successful treatment leads to bacterial eradication and resolution of observed ultrastructural alterations.