title: Oxygen concentration influences proton pump inhibitor activity against Helicobacter pylori in vitro.
abstract: Omeprazole and lansoprazole are proton pump inhibitors that have shown activity against Helicobacter pylori and other Helicobacter species when tested by agar dilution. Lansoprazole was more active against H. pylori than was omeprazole, and the activity was independent of urease production. Disk susceptibility tests and agar dilution MIC determinations were performed to investigate the effects of incubation under different sets of atmospheric conditions on H. pylori inhibition. Oxygen concentration was found to influence proton pump inhibitor activity in vitro, with higher concentrations leading to greater susceptibility. The method of testing is important in determining the anti-Helicobacter activity of proton pump inhibitors.
authors.affiliation: Department of Microbiology and Infectious Diseases, Monash Medical Centre, Clayton, Victoria, Australia.
authors.forename: P D
authors.initials: PD
authors.lastname: Midolo
authors.forename: J D
authors.initials: JD
authors.lastname: Turnidge
authors.forename: J R
authors.initials: JR
authors.lastname: Lambert
authors.forename: J M
authors.initials: JM
authors.lastname: Bell
mesh_terms: D053799:2-Pyridinylmethylsulfinylbenzimidazoles; D000388:Air / Q000032:analysis; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D004791:Enzyme Inhibitors / Q000494:pharmacology; D016480:Helicobacter pylori / Q000187:drug effects*; D064747:Lansoprazole; D008795:Metronidazole / Q000494:pharmacology; D008826:Microbial Sensitivity Tests; D009853:Omeprazole / Q000031:analogs & derivatives* / Q000494:pharmacology*; D010100:Oxygen / Q000494:pharmacology*; D054328:Proton Pump Inhibitors
chemical_list: D053799:2-Pyridinylmethylsulfinylbenzimidazoles; D000900:Anti-Bacterial Agents; D004791:Enzyme Inhibitors; D054328:Proton Pump Inhibitors; D064747:Lansoprazole; D008795:Metronidazole; D009853:Omeprazole; D010100:Oxygen