H. pylori/NSAID--negative peptic ulcer--the mucin theory
1Department of Gastroenterology, Rabin Medical Center, Tel Aviv University, Israel. yniv@clalit.org.il
Abstract:
The incidence of Helicobacter pylori (H. pylori) and non-steroidal anti inflammatory drug (NSAID)--negative peptic ulcer disease increases, especially in the Western world and in countries where H. pylori infection rate is low. For the diagnosis of "idiopathic ulcer" one should rule out, in addition to H. pylori infection and NSAID or aspirin therapy, also other drugs, other infectious agents, as well as malignant and benign rare diseases. The mucin unstirred layer keeps the pH above the mucosa stable, and prevents the enzymatic attack by pepsin. Inhibition of cyclo-oxygenase by NSAID and aspirin prevents mucin secretion and exposes the mucosa for toxic effect of acid and enzymes. There is also relationship between H. pylori and mucin that from one hand enables mucin invasion but on the other hand protects the gastric mucosa. Mucin genetic or epigenetic changes may be blamed for idiopathic peptic ulcer disease, but this hypothesis should be further investigated.
Insights
The incidence of non-steroidal anti-inflammatory drug (NSAID)-negative peptic ulcers is rising, particularly in regions with low Helicobacter pylori infection rates. Further research is needed to explore the role of mucin changes in idiopathic peptic ulcer disease.
Area of Science:
- Gastroenterology
- Pathophysiology
- Microbiology
Background:
- Peptic ulcer disease incidence is increasing, especially in H. pylori-negative and NSAID-negative cases.
- Idiopathic ulcers require ruling out various causes beyond H. pylori and NSAIDs, including rare diseases and infections.
- The gastric mucin layer is crucial for mucosal protection against acid and pepsin.
Purpose of the Study:
- To investigate the increasing incidence of H. pylori and NSAID-negative peptic ulcer disease.
- To explore the potential role of mucin alterations in the pathogenesis of idiopathic peptic ulcers.
Main Methods:
- Literature review on H. pylori infection, NSAID use, and peptic ulcer disease.
- Analysis of the protective mechanisms of the gastric mucin unstirred layer.
- Examination of the interaction between H. pylori and gastric mucin.
Main Results:
- NSAID and aspirin inhibit cyclooxygenase, reducing mucin secretion and increasing mucosal vulnerability.
- H. pylori has a complex relationship with mucin, facilitating invasion while offering some protection.
- Mucin genetic or epigenetic changes are hypothesized as a potential cause for idiopathic peptic ulcer disease.
Conclusions:
- The rising incidence of idiopathic peptic ulcers necessitates a comprehensive differential diagnosis.
- Understanding the role of mucin in gastric mucosal defense is critical.
- Further investigation into mucin alterations is warranted to elucidate the causes of idiopathic peptic ulcer disease.
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