title: Oxidative epithelial host defense is regulated by infectious and inflammatory stimuli.
abstract: Epithelia express oxidative antimicrobial protection that uses lactoperoxidase (LPO), hydrogen peroxide (H(2)O(2)), and thiocyanate to generate the reactive hypothiocyanite. Duox1 and Duox2, found in epithelia, are hypothesized to provide H(2)O(2) for use by LPO. To investigate the regulation of oxidative LPO-mediated host defense by bacterial and inflammatory stimuli, LPO and Duox mRNA were followed in differentiated primary human airway epithelial cells challenged with Pseudomonas aeruginosa flagellin or IFN-gamma. Flagellin upregulated Duox2 mRNA 20-fold, but upregulated LPO mRNA only 2.5-fold. IFN-gamma increased Duox2 mRNA 127-fold and upregulated LPO mRNA 10-fold. DuoxA2, needed for Duox2 activity, was also upregulated by flagellin and IFN-gamma. Both stimuli increased H(2)O(2) synthesis and LPO-dependent killing of P. aeruginosa. Reduction of Duox1 by siRNA showed little effect on basal H(2)O(2) production, whereas Duox2 siRNA markedly reduced basal H(2)O(2) production and resulted in an 8-fold increase in Nox4 mRNA. In conclusion, large increases in Duox2-mediated H(2)O(2) production seem to be coordinated with increases in LPO mRNA and, without increased LPO, H(2)O(2) levels in airway secretion are expected to increase substantially. The data suggest that Duox2 is the major contributor to basal H(2)O(2) synthesis despite the presence of greater amounts of Duox1.
authors.affiliation: Department of Cell Biology and Anatomy, Miller School of Medicine, University of Miami, Miami, FL 33136, USA.
authors.forename: Monica Valencia
authors.initials: MV
authors.lastname: Gattas
authors.forename: Radia
authors.initials: R
authors.lastname: Forteza
authors.forename: Miryam A
authors.initials: MA
authors.lastname: Fragoso
authors.forename: Nevis
authors.initials: N
authors.lastname: Fregien
authors.forename: Pedro
authors.initials: P
authors.lastname: Salas
authors.forename: Matthias
authors.initials: M
authors.lastname: Salathe
authors.forename: Gregory E
authors.initials: GE
authors.lastname: Conner
mesh_terms: D002478:Cells, Cultured; D000074623:Dual Oxidases; D004847:Epithelial Cells / Q000276:immunology* / Q000382:microbiology*; D005408:Flagellin / Q000276:immunology*; D006801:Humans; D006861:Hydrogen Peroxide / Q000276:immunology / Q000378:metabolism; D007249:Inflammation / Q000276:immunology; D007371:Interferon-gamma / Q000276:immunology*; D007784:Lactoperoxidase / Q000235:genetics / Q000276:immunology*; D019255:NADPH Oxidases / Q000235:genetics / Q000276:immunology; D018384:Oxidative Stress; D011550:Pseudomonas aeruginosa / Q000276:immunology*; D012333:RNA, Messenger / Q000235:genetics / Q000276:immunology
chemical_list: D012333:RNA, Messenger; D005408:Flagellin; D007371:Interferon-gamma; D006861:Hydrogen Peroxide; D000074623:Dual Oxidases; D007784:Lactoperoxidase; D019255:NADPH Oxidases; C431515:DUOX2 protein, human
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