Proton pump inhibitors and gastritis

Area of Science:

• Pharmacology
• Gastroenterology
• Immunology

Background:

• Proton pump inhibitors (PPIs) strongly inhibit gastric acid secretion by targeting H(+)/K(+)-ATPase.
• Vacuolar-type ATPase in leukocytes and osteoclasts may also be influenced by PPIs.
• Gastric acid is critical in Helicobacter pylori (H. pylori) induced gastritis, potentially leading to preneoplastic changes.

Purpose of the Study:

• To explore the additional pharmacological actions of PPIs beyond acid suppression.
• To investigate the impact of PPIs on neutrophil function and their role in H. pylori-associated gastritis.
• To highlight the need for more research on the long-term efficacy and safety of PPIs.

Main Methods:

• Autoradiography to detect (3)H-Lansoprazole uptake in neutrophils.
• In vitro studies on purified neutrophils to assess lysosomal pH and endothelial adherence.
• Analysis of gastritis patterns in H. pylori-infected patients undergoing PPI therapy.

Main Results:

• (3)H-Lansoprazole uptake was observed in neutrophils infiltrating the gastric mucosa.
• PPIs were shown to increase intra-vacuolar pH in neutrophil lysosomes and reduce neutrophil adherence to endothelium.
• PPI therapy in H. pylori-infected patients resulted in corpus-predominant gastritis, a pattern associated with gastric cancer.

Conclusions:

• PPIs exhibit effects on neutrophil function, potentially influencing inflammatory processes.
• The observed gastritis pattern associated with PPIs in H. pylori infection warrants further investigation due to its link with gastric cancer.
• The long-term efficacy and safety of PPIs require more conclusive evidence, emphasizing the need to consider their broader pharmacological actions.