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Genotoxicity and cell proliferative activity of omeprazole in rat stomach mucosa
C Furihata1, K Hirose, T Matsushima
1Department of Molecular Oncology, University of Tokyo, Japan.
Abstract:
Induction of unscheduled DNA synthesis (UDS) as a marker of genotoxicity and induction of ornithine decarboxylase (ODC) activity as a marker of cell proliferative activity by omeprazole were determined in the glandular stomach mucosa of male F344 rats after oral administration. Commercial enteric-coated omeprazole (Losec) at doses of 30 and 100 mg/kg body weight induced a dose-dependent increase in UDS but not replicative DNA synthesis in the pyloric mucosa of rat stomach 4 h after its administration. Dose-dependent significant induction of ODC activity was observed in fundic and pyloric mucosa with a maximum 8 h after administration of omeprazole at doses of 37.5-100 mg/kg body weight. These results show that omeprazole has genotoxicity and cell proliferative activity in the rat glandular stomach mucosa.
Insights
Omeprazole, a common medication, showed genotoxicity and increased cell proliferation in rat stomach tissue. Further research is needed to understand its long-term effects in humans.
Area of Science:
- Toxicology
- Gastroenterology
- Pharmacology
Background:
- Omeprazole is a widely used proton pump inhibitor.
- Assessing its potential genotoxicity and proliferative effects is crucial for understanding its safety profile.
Purpose of the Study:
- To evaluate the genotoxic and cell proliferative activities of omeprazole in rat gastric mucosa.
- To investigate the dose-dependent effects of omeprazole on DNA synthesis and ornithine decarboxylase (ODC) activity.
Main Methods:
- Oral administration of omeprazole to male F344 rats at varying doses.
- Measurement of unscheduled DNA synthesis (UDS) as a marker for genotoxicity.
- Assay of ornithine decarboxylase (ODC) activity as a marker for cell proliferation.
Main Results:
- Omeprazole induced a dose-dependent increase in UDS in the pyloric mucosa.
- Replicative DNA synthesis was not significantly affected.
- A significant, dose-dependent induction of ODC activity was observed in both fundic and pyloric mucosa.
Conclusions:
- Omeprazole exhibits genotoxic potential in the rat glandular stomach.
- The drug also demonstrates cell proliferative activity in the gastric mucosa.
- These findings highlight the importance of considering omeprazole's effects on DNA and cell growth.