Related Experiment Videos
Effects of omeprazole on gastric mucosal growth and differentiation in developing rat
N Kakei1, M Ichinose, S Tsukada
1First Department of Internal Medicine, Faculty of Medicine, University of Tokyo, Japan.
Insights
Omeprazole disrupts developing rat stomach lining by increasing cell proliferation and delaying differentiation. This proton pump inhibitor affects pepsinogen levels and cell maturation during a critical growth period.
Area of Science:
- Gastroenterology
- Developmental Biology
- Pharmacology
Background:
- The developing stomach mucosa is sensitive to external factors.
- Proton pump inhibitors like omeprazole are widely used but their effects on developing organs require investigation.
Purpose of the Study:
- To investigate the impact of omeprazole on the developing rat stomach mucosa.
- To understand the cellular and molecular changes induced by omeprazole during gastric development.
Main Methods:
- Infant rats received daily subcutaneous injections of omeprazole or vehicle from birth.
- Measurements included mucosal pH, pepsinogen and its mRNA levels, cell differentiation markers (cathepsin E), and cell proliferation (bromodeoxyuridine labeling).
Main Results:
- Omeprazole elevated mucosal pH and suppressed pepsinogen and mRNA levels.
- A reduction in mature pepsinogen-producing cells and delayed cathepsin E expression were observed.
- Increased cell proliferation (bromodeoxyuridine labeling) and delayed differentiation of the stomach mucosa were noted, particularly between days 15-21.
Conclusions:
- Omeprazole induces increased cell proliferation and delays differentiation in the developing rat stomach mucosa.
- These effects are linked to omeprazole's potent acid inhibitory action during critical developmental stages of gastric acid secretion.
Abstract:
The effects of omeprazole on developing rat stomach mucosa were investigated. Infant rats were given subcutaneous injections of either omeprazole (25 mg/kg body weight/day) or vehicle once a day from the day after birth. As a result, omeprazole caused an elevation of mucosal pH and suppressed an increase in mucosal pepsinogen and its mRNA levels during stomach development. Histologically, these changes were associated with a reduction in mature pepsinogen-producing cells throughout stomach mucosa. Omeprazole also caused a delay in the expression of cathepsin E in surface mucous cells and an increase in labeled cells with bromodeoxyuridine. Thus, the present results indicate that omeprazole induces an increase in mucosal cell proliferation and delays the differentiation of developing rat stomach mucosa. Since the observed changes were remarkable especially from days 15 to 21 after birth when significant development of acid secretion occurs, the effects of omeprazole appear to be related with the potent acid inhibitory effect of the reagent.