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Activity of omeprazole on Helicobacter pylori and relation to toxicity of strains
N Figura1, D Armellini, M Bugnoli
1Istituto di Patologia Speciale Medica, University of Siena, Policlinico Le Scotte, Italy.
Aims:
To see whether the activity of omeprazole on Helicobacter pylori is associated with toxicity of strains; to determine whether omeprazole inhibited vacuolisation of cells in culture induced by H pylori cytotoxin and by ureas, and if omeprazole prevented H pylori motility.
Methods:
Minimal inhibitory concentrations (MICs) of omeprazole were determined for seven cytotoxic and five non-cytotoxic H pylori strains. Omeprazole at different concentrations was incubated with cytotoxic and non-cytotoxic extracts of H pylori, or with purified H pylori urease, and added to cells in culture. Inhibition of motility by omeprazole was tested in semi-solid medium.
Results:
MIC90 of omeprazole was 40 micrograms/ml. MICs for cytotoxic and noncytotoxic organisms were similar. Omeprazole did not prevent vacuolisation induced by the cytotoxic extract, but at high concentrations it inhibited the formation of vacuoles induced by urease. Motility was not inhibited by the drug.
Conclusions:
H pylori cytotoxin is not the target of the antimicrobial activity of omeprazole. Should the drug reach clinically effective concentrations in vivo, it could potentially prevent the mucosal damage caused by the vacuolising activity of urease.
Insights
Omeprazole does not target Helicobacter pylori cytotoxin but may prevent mucosal damage by inhibiting urease activity at high concentrations. This research explores omeprazole
Area of Science:
- Microbiology
- Pharmacology
Background:
- Helicobacter pylori (H. pylori) infection is a major cause of gastroduodenal diseases.
- Omeprazole, a proton pump inhibitor, has shown antimicrobial activity against H. pylori.
Purpose of the Study:
- To investigate the association between omeprazole's activity and H. pylori strain toxicity.
- To determine if omeprazole inhibits H. pylori-induced vacuolization and motility.
Main Methods:
- Minimal inhibitory concentrations (MICs) of omeprazole were determined for cytotoxic and non-cytotoxic H. pylori strains.
- Omeprazole's effect on H. pylori extracts, purified urease, and cell vacuolization was assessed.
- H. pylori motility inhibition by omeprazole was tested in semi-solid medium.
Main Results:
- The MIC90 of omeprazole against H. pylori was 40 µg/ml, with similar MICs for both cytotoxic and non-cytotoxic strains.
- Omeprazole did not prevent vacuolization induced by H. pylori cytotoxic extract.
- High concentrations of omeprazole inhibited urease-induced vacuolization, but not H. pylori motility.
Conclusions:
- H. pylori cytotoxin is not the primary target of omeprazole's antimicrobial action.
- Omeprazole may prevent H. pylori-induced mucosal damage by inhibiting urease activity at effective in vivo concentrations.