title: Propionic acid-induced calcium mobilization in human neutrophils.
abstract: The ability of propionic acid to elicit an increase in the level of cytoplasmic free calcium in human neutrophils was examined in detail. Propionic acid induced a rapid and dose-dependent mobilization of calcium that relied on both internal and external sources of calcium. The effects of propionic acid on the mobilization of calcium were inhibited by pertussis toxin, but not cholera toxin, implicating a guanine nucleotide binding protein. Furthermore, preincubation of the neutrophils with phorbol 12-myristate 13-acetate resulted in a decreased mobilization of calcium. This inhibitory activity of phorbol myristate acetate was antagonized by the protein kinase C inhibitor H-7. Preincubation of the cells with the synthetic chemotactic factor fMet-Leu-Phe caused a reduction in the magnitude of the calcium transient elicited by propionic acid. However, the calcium response to propionic acid was not affected by antagonists of fMet-Leu-Phe and platelet-activating factor binding or by an inhibitor of leukotriene synthesis. Propionic acid did not elicit a mobilization of calcium in monocytes, platelets, lymphocytes, or undifferentiated HL-60 cells. However, the treatment of the HL-60 cells with dimethylsulfoxide resulted in the appearance of a calcium response to propionic acid. The potential physiological significance of these findings are discussed.
authors.affiliation: Unité de Recherche Inflammation et Immunologie-Rhumatologie, Centre Hospitalier de l'Université Laval, Québec, Canada.
authors.forename: P H
authors.initials: PH
authors.lastname: Naccache
authors.forename: N
authors.initials: N
authors.lastname: Faucher
authors.forename: A C
authors.initials: AC
authors.lastname: Caon
authors.forename: S R
authors.initials: SR
authors.lastname: McColl
mesh_terms: D002118:Calcium / Q000097:blood*; D002460:Cell Line; D002772:Cholera Toxin / Q000494:pharmacology; D006801:Humans; D006863:Hydrogen-Ion Concentration; D015470:Leukemia, Myeloid, Acute / Q000378:metabolism; D007975:Leukotriene B4 / Q000494:pharmacology; D009240:N-Formylmethionine Leucyl-Phenylalanine / Q000494:pharmacology; D009504:Neutrophils / Q000187:drug effects / Q000378:metabolism*; D037342:Pertussis Toxin; D011422:Propionates / Q000494:pharmacology*; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D010566:Virulence Factors, Bordetella / Q000494:pharmacology
chemical_list: D011422:Propionates; D010566:Virulence Factors, Bordetella; D007975:Leukotriene B4; D009240:N-Formylmethionine Leucyl-Phenylalanine; D002772:Cholera Toxin; D037342:Pertussis Toxin; C029658:propionic acid; D013755:Tetradecanoylphorbol Acetate; D002118:Calcium