title: LPS-induced bronchial hyperreactivity: interference by mIL-10 differs according to site of delivery.
abstract: When administered to mice systemically or via the airways, LPS induces bronchoconstriction (BC) and/or bronchopulmonary hyperreactivity (BHR), associated with inflammation. Accordingly, a relationship between inflammation and allergic and nonallergic BHR can be hypothesized. We therefore studied the interference of the anti-inflammatory cytokine murine IL-10 (mIL-10) with LPS-induced lung inflammation, BC, and BHR. mIL-10 was administered directly into the airways by intranasal instillation or generated in vivo after muscle electrotransfer of mIL-10-encoding plasmid. Electrotransfer led to high mIL-10 circulating levels for a longer time than after the injection of recombinant mIL-10 (rmIL-10). rmIL-10 administered intranasally reduced lung inflammation and BHR after LPS administration into airways. It also reduced the ex vivo production of TNF-alpha by LPS-stimulated lung tissue explants. Two days after electrotransfer, mIL-10 blood levels were elevated, but lung inflammation, BC, and BHR persisted unaffected. Blood mIL-10 reaches the airways poorly, which probably accounts for the ineffectiveness of mIL-10-encoding plasmid electrotransfer. When LPS was aerosolized 15 days after electrotransfer, lung inflammation persisted but BHR was significantly reduced, an effect that may be related to the longer exposure of the relevant cells to mIL-10. The dissociation between inflammation and BHR indicates that both are not directly correlated. In conclusion, this study shows that mIL-10 is efficient against BHR when present in the airway compartment. Despite this, the muscle electrotransfer with mIL-10-encoding plasmid showed a protective effect against BHR after a delay of 2 wk that should be further investigated.
authors.affiliation: Unité Mixte de Recherche, 7001 Centre National de la Recherche Scientifique/Ecole Nationale de Chimie de Paris/Aventis Pharma--Gencell Société Anonyme, Vitry-sur-Seine, France.
authors.forename: Virginie
authors.initials: V
authors.lastname: Deleuze
authors.forename: Jean
authors.initials: J
authors.lastname: Lefort
authors.forename: Michel F
authors.initials: MF
authors.lastname: Bureau
authors.forename: Daniel
authors.initials: D
authors.lastname: Scherman
authors.forename: B Boris
authors.initials: BB
authors.lastname: Vargaftig
mesh_terms: D000281:Administration, Intranasal; D000818:Animals; D016535:Bronchial Hyperreactivity / Q000139:chemically induced / Q000188:drug therapy* / Q000276:immunology; D018274:Electroporation; D005260:Female; D015316:Genetic Therapy; D066298:In Vitro Techniques; D016753:Interleukin-10 / Q000097:blood / Q000235:genetics* / Q000494:pharmacology*; D008070:Lipopolysaccharides / Q000494:pharmacology*; D051379:Mice; D008810:Mice, Inbred C57BL; D009330:Nebulizers and Vaporizers; D010957:Plasmids / Q000494:pharmacology; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism
chemical_list: D008070:Lipopolysaccharides; D014409:Tumor Necrosis Factor-alpha; D016753:Interleukin-10