title: Airway hyperresponsiveness is associated with activated CD4+ T cells in the airways.
abstract: It is widely accepted that atopic asthma depends on an allergic response in the airway, yet the immune mechanisms that underlie the development of airway hyperresponsiveness (AHR) are poorly understood. Mouse models of asthma have been developed to study the pathobiology of this disease, but there is considerable strain variation in the induction of allergic disease and AHR. The aim of this study was to compare the development of AHR in BALB/c, 129/Sv, and C57BL/6 mice after sensitization and challenge with ovalbumin (OVA). AHR to methacholine was measured using a modification of the forced oscillation technique in anesthetized, tracheostomized mice to distinguish between airway and parenchymal responses. Whereas all strains showed signs of allergic sensitization, BALB/c was the only strain to develop AHR, which was associated with the highest number of activated (CD69(+)) CD4(+) T cells in the airway wall and the highest levels of circulating OVA-specific IgG(1). AHR did not correlate with total or antigen-specific IgE. We assessed the relative contribution of CD4(+) T cells and specific IgG(1) to the development of AHR in BALB/c mice using adoptive transfer of OVA-specific CD4(+) T cells from DO11.10 mice. AHR developed in these mice in a progressive fashion following multiple OVA challenges. There was no evidence that antigen-specific antibody had a synergistic effect in this model, and we concluded that the number of antigen-specific T cells activated and recruited to the airway wall was crucial for development of AHR.
authors.affiliation: Telethon Institute for Child Health Research and Centre for Child Health Research, University of Western Australia, Australia. graemez@ichr.uwa.edu.au
authors.forename: Graeme R
authors.initials: GR
authors.lastname: Zosky
authors.forename: Alexander N
authors.initials: AN
authors.lastname: Larcombe
authors.forename: Olivia J
authors.initials: OJ
authors.lastname: White
authors.forename: Jennifer T
authors.initials: JT
authors.lastname: Burchell
authors.forename: Christophe
authors.initials: C
authors.lastname: von Garnier
authors.forename: Patrick G
authors.initials: PG
authors.lastname: Holt
authors.forename: Debra J
authors.initials: DJ
authors.lastname: Turner
authors.forename: Matthew E
authors.initials: ME
authors.lastname: Wikstrom
authors.forename: Peter D
authors.initials: PD
authors.lastname: Sly
authors.forename: Philip A
authors.initials: PA
authors.lastname: Stumbles
mesh_terms: D000403:Airway Resistance / Q000187:drug effects / Q000276:immunology*; D000818:Animals; D015703:Antigens, CD / Q000378:metabolism; D000945:Antigens, Differentiation, T-Lymphocyte / Q000378:metabolism; D001249:Asthma / Q000276:immunology*; D016535:Bronchial Hyperreactivity / Q000276:immunology*; D001992:Bronchoalveolar Lavage Fluid / Q000166:cytology / Q000276:immunology; D016085:Bronchoconstrictor Agents / Q000494:pharmacology; D018791:CD4 Lymphocyte Count; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology* / Q000378:metabolism; D004195:Disease Models, Animal; D005260:Female; D007073:Immunoglobulin E / Q000097:blood; D007074:Immunoglobulin G / Q000097:blood; D037181:Lectins, C-Type; D016210:Methacholine Chloride / Q000494:pharmacology; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D010047:Ovalbumin / Q000276:immunology / Q000494:pharmacology; D013047:Specific Pathogen-Free Organisms; D000099192:CD69 Antigens
chemical_list: D015703:Antigens, CD; D000945:Antigens, Differentiation, T-Lymphocyte; D016085:Bronchoconstrictor Agents; D007073:Immunoglobulin E; D007074:Immunoglobulin G; D037181:Lectins, C-Type; D016210:Methacholine Chloride; D010047:Ovalbumin; D000099192:CD69 Antigens