title: Effects of omeprazole on neutrophil chemotaxis, super oxide production, degranulation, and translocation of cytochrome b-245.
abstract: The effects of omeprazole on polymorphonuclear neutrophil (PMN) chemotaxis, superoxide generation, degranulation and translocation of cytochrome b-245 were investigated. Omeprazole (10(-6) - 5 x 10(-3) mol/l) reduced chemotaxis under agarose in a dose dependent manner, and the effect was irreversible. Superoxide anion generation was inhibited 50% at a concentration of 2.5 x 10(-5) mol/l and completely abolished at 5 x 10(-3) mol/l. Acid degraded omeprazole also inhibited O2- generation. Omeprazole did not scavenge O2- generated in a cell free xanthin-xanthine oxidase system. Degranulation by PMNs was inhibited only by omeprazole in concentrations above 10(-4) mol/l. Translocation of cytochrome b-245, essential for generation of O2-, was not affected by omeprazole. In conclusion, the anti-ulcer agent omeprazole in concentrations obtained during intravenous administration may inhibit the function of PMNs in vitro.
authors.affiliation: Blood Transfusion Service, Massachusetts General Hospital, Boston.
authors.forename: J H
authors.initials: JH
authors.lastname: Wandall
mesh_terms: D015550:Cell Degranulation / Q000187:drug effects; D002634:Chemotaxis, Leukocyte / Q000187:drug effects*; D003573:Cytochrome b Group / Q000378:metabolism*; D004305:Dose-Response Relationship, Drug; D006801:Humans; D066298:In Vitro Techniques; D009504:Neutrophils / Q000187:drug effects* / Q000378:metabolism; D009853:Omeprazole / Q000494:pharmacology*; D013481:Superoxides / Q000378:metabolism*
chemical_list: D003573:Cytochrome b Group; C035130:cytochrome b245; D013481:Superoxides; D009853:Omeprazole