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Role of Helicobacter pylori in chronic gastritis: a prospective study
1Third Department of Internal Medicine, Hokkaido University School of Medicine, Sapporo, Japan.
Abstract:
We conducted a prospective study to evaluate the relationship between Helicobacter pylori infection and chronic gastritis in a Japanese population. H. pylori was found in 67% of patients positive for mononuclear cell (MN cell) infiltration and in 75.8% of patients positive for polymorphonuclear cell (PMN cell) infiltration, whereas H. pylori was found in 14.2% of patients without MN cell infiltration and in 33.2% of patients without PMN cell infiltration. The frequency of MN and PMN cell infiltration in H. pylori-positive patients was significantly higher than that in H. pylori-negative patients. The frequency of H. pylori infection did not differ in those with atrophic gastritis from those without, whereas the frequency of intestinal metaplasia became significantly higher in those with moderate and severe atrophy. There was no significant difference between serum pepsinogen I (PG I) levels in H. pylori-positive and -negative patients. However serum PG II levels were significantly increased in H. pylori-positive patients aged 40-69 years. The serum PG I-II ratio was significantly lower in H. pylori-positive patients aged 40-59 years. These results suggest that H. pylori infection in the gastric mucosa plays an important role in the pathogenesis of chronic and atrophic gastritis and in the development of intestinal metaplasia.
Insights
Helicobacter pylori infection is strongly linked to chronic gastritis and intestinal metaplasia in Japanese patients. This finding highlights the crucial role of H. pylori in gastric mucosal inflammation and disease progression.
Area of Science:
- Gastroenterology
- Microbiology
- Pathology
Background:
- Helicobacter pylori (H. pylori) is a common pathogen implicated in various gastric diseases.
- Chronic gastritis is a prevalent condition with diverse etiologies.
- Understanding the specific relationship between H. pylori and gastritis subtypes in different populations is crucial.
Purpose of the Study:
- To investigate the association between H. pylori infection and chronic gastritis, including cellular infiltration, atrophy, and intestinal metaplasia.
- To evaluate the correlation between H. pylori status and serum pepsinogen levels in a Japanese cohort.
- To elucidate the role of H. pylori in the pathogenesis of gastric mucosal changes.
Main Methods:
- Prospective study design.
- Assessment of H. pylori infection status.
- Histopathological evaluation of gastric biopsies for mononuclear cell (MN cell) and polymorphonuclear cell (PMN cell) infiltration, atrophy, and intestinal metaplasia.
- Measurement of serum pepsinogen I (PG I) and PG II levels.
Main Results:
- H. pylori was detected in a significantly higher percentage of patients with MN cell and PMN cell infiltration compared to those without.
- The frequency of H. pylori infection did not differ between patients with and without atrophic gastritis.
- Intestinal metaplasia was significantly more frequent in patients with moderate to severe atrophy.
- Serum PG II levels were elevated in H. pylori-positive patients aged 40-69, and the PG I-II ratio was lower in those aged 40-59.
Conclusions:
- H. pylori infection is a significant factor in the development of chronic gastritis and associated cellular infiltrations.
- H. pylori plays a key role in the progression of atrophic gastritis to intestinal metaplasia.
- Altered serum pepsinogen levels in H. pylori-positive individuals may serve as indicators of gastric mucosal changes.