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Does Helicobacter pylori affect gastric mucin expression? Relationship between gastric antral mucin expression and H.
S Morgenstern1, R Koren, S F Moss
1Department of Pathology, Rabin Medical Center, Tel Aviv University, Israel.
Background/Objective:
Helicobacter pylori colonizes the gastric mucous gel layer, the surface epithelium and glands. It has been shown that H. pylori infection causes aberrant expression of gastric mucins MUC 5 and MUC 6. This study aimed to determine the distribution of MUC 5 and MUC 6 in the gastric antrum of dyspeptic patients, and to investigate changes in this pattern in the presence of H. pylori and after successful eradication.
Materials And Methods:
Gastric antrum biopsy specimens were examined by immunohistochemistry for mucin gene (MUC 5 and MUC 6) expression. Polyclonal antibodies were used to detect amino acid tandem repeats of each protein. A scoring system (0-3) was used to assess staining intensity at three sites: foveola, mucous neck cells and glands. H. pylori status was determined by histology and rapid urease test, and considered positive or negative when both tests were positive or negative, respectively. The study included 49 patients positive for H. pylori, in 36 of whom successful eradication was performed, and 11 H. pylori-negative patients.
Results:
There was a gradient of MUC 5 expression, higher to lower, from the surface to the glands, which was more pronounced before eradication. Increased MUC 5 synthesis in the mucous neck cells and in the glands was found after H. pylori eradication (P = 0.016). MUC 6 was synthesized in the glands more than in the mucous neck cells or foveola. MUC 6 was also secreted into the lumen and probably comprised the superficial part of the unstirred mucous layer.
Conclusion:
The change in MUC 5 synthesis may reflect H. pylori colonization.
Insights
Helicobacter pylori infection alters MUC 5 mucin expression in the gastric antrum. Successful eradication of H. pylori normalizes MUC 5 synthesis, suggesting a link between infection and mucin changes.
Area of Science:
- Gastroenterology
- Molecular Biology
- Pathology
Background:
- Helicobacter pylori (H. pylori) infection is linked to altered gastric mucin expression.
- Gastric mucins MUC 5 and MUC 6 are key components of the gastric mucus layer.
Purpose of the Study:
- To investigate the distribution of MUC 5 and MUC 6 mucins in the gastric antrum of dyspeptic patients.
- To assess changes in MUC 5 and MUC 6 expression in the presence of H. pylori and after its eradication.
Main Methods:
- Immunohistochemistry was used to analyze MUC 5 and MUC 6 expression in gastric antrum biopsies.
- H. pylori status was confirmed by histology and rapid urease testing.
- Staining intensity was scored at foveola, mucous neck cells, and glands.
Main Results:
- MUC 5 expression showed a gradient from surface to glands, more pronounced before H. pylori eradication.
- Increased MUC 5 synthesis in mucous neck cells and glands was observed post-eradication (P = 0.016).
- MUC 6 was primarily synthesized in glands and secreted into the lumen.
Conclusions:
- Altered MUC 5 synthesis patterns may indicate H. pylori colonization.
- Successful H. pylori eradication appears to restore normal MUC 5 expression.