Studies on gastrin in duodenal ulcer

Area of Science:

• Gastroenterology
• Cell Biology
• Endocrinology

Background:

• Duodenal ulcer (DU) is a common gastrointestinal disorder.
• Gastrin plays a crucial role in regulating gastric acid secretion.
• The role of gastrin-secreting cells (G cells) in DU pathogenesis requires further elucidation.

Purpose of the Study:

• To investigate the number of G cells and gastrin concentration in the antral mucosa, gastric juice, and serum of patients with duodenal ulcers.
• To explore the relationship between G cells, gastrin levels, and gastric acid hypersecretion in DU.

Main Methods:

• Immunocytochemistry was used to quantify G cells in antral mucosa.
• Radioimmunoassay was employed to measure gastrin concentrations in serum and gastric juice.
• Comparison between patients with DU, antral atrophy, and healthy controls.

Main Results:

• No significant difference in G cell number or gastrin concentration in antral mucosa between DU patients and controls.
• G cell numbers were significantly higher in DU patients with antral atrophy compared to those without DU.
• Gastrin concentration was markedly elevated in gastric juice (271.11 pg/ml) compared to serum (74.71 pg/ml) in DU patients.
• G cells were found throughout the pyloric glands, indicating direct gastrin secretion into gastric juice.

Conclusions:

• G cell hyperplasia occurs in duodenal ulcers, particularly with coexisting antral atrophy.
• Elevated gastrin levels in gastric juice, originating directly from G cells, may contribute to gastric acid hypersecretion.
• A disturbed feedback mechanism regulating gastric acidity is implicated in the pathophysiology of duodenal ulcers.