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Development of murine allergic asthma is dependent upon B7-2 costimulation.

Authors: Keane-Myers, AM  Gause, WC  Finkelman, FD  Xhou, XD  Wills-Karp, M 
Citation: Keane-Myers AM, etal., J Immunol. 1998 Jan 15;160(2):1036-43.
Pubmed: (View Article at PubMed) PMID:9551945

Allergic asthma is thought to be mediated by CD4+ T lymphocytes producing the Th2-associated cytokines, IL-4, and IL-5. Recently, the costimulatory molecules B7-1 and B7-2, which are expressed on the surface of APC, have been suggested to influence the development of Th1 vs Th2 immune responses. We examined the in vivo role of these costimulatory molecules in the pathogenesis of Th2-mediated allergen-induced airway hyperresponsiveness in a murine model of asthma. In this model, OVA-sensitized A/J mice develop significant increases in airway responsiveness, pulmonary eosinophilia, and pulmonary Th2 cytokine expression following aspiration challenge with OVA as compared with PBS-control animals. Strikingly, administration of anti-B7-2 mAb to OVA-treated mice abolished allergen-induced airway hyperresponsiveness, pulmonary eosinophilia, and elevations in serum IgG1 and IgE levels. Anti-B7-2 treatment of OVA-treated mice reduced both total lung IL-4 and IL-5 mRNA and bronchoalveolar lavage fluid IL-4 and IL-5 protein levels, with no significant changes in IFN-gamma message or protein levels. In contrast, treatment with anti-B7-1 mAbs had no effect on allergen-induced airway hyperresponsiveness, IgE production, or cytokine production, however, it significantly suppressed pulmonary eosinophilia. We conclude that B7-2 provides the necessary costimulatory signal required for the development of in vivo allergic responses to inhaled allergen exposure.

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CRRD Object Information
CRRD ID: 4892202
Created: 2011-02-10
Species: All species
Last Modified: 2011-02-10
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.