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,
,,¶
*
Division of Rheumatology and Immunology, and
Pulmonary and Critical Care Division, Department of Internal Medicine,
University of Virginia Specialized Center of Research on Systemic Lupus Erythematosus,
University of Virginia Cancer Center, and
¶ Department of Microbiology, University of Virginia Health Sciences Center, Charlottesville, VA 22908
Dendritic cells (DC) are the primary APC responsible for the capture of allergens in the airways and the shuttling of processed allergens to the draining lymph nodes where Ag presentation and T cell activation take place. The mechanism of this Ag handling and presentation in asthma is poorly understood. In addition, the feasibility of asthma induction by DC priming has not been directly tested. In this report an asthma model using intratracheally (i.t.) injected splenic DC was used to address these issues. DC pulsed with a model Ag OVA or the major MHC class II-restricted OVA T epitope peptide OVA323–339 and instilled i.t. primed mice to exhibit asthma-like diseases. With OVA as the Ag, mice exhibit airway hyperresponsiveness (AHR), lung eosinophilia and inflammation, and pulmonary goblet cell hyperplasia. In OVA323–339-immunized mice, AHR and goblet cell hyperplasia were noted, with little eosinophilia and parenchymal inflammation. The latter finding provides evidence for dissociating AHR from eosinophilia. In both cases mediastinal node hypertrophy occurred, and high levels of Th2 cytokines were produced by the lung and mediastinal lymph node cells (LNC). Interestingly, mediastinal LNC also produced high levels of Th1 cytokines. Lung cells produced much less Th1 cytokines than these LNC. These results demonstrate that DC when introduced i.t. are potent in inducing asthma-like diseases by recruiting lymphocytes to the lung-draining lymph nodes and by stimulating Th2 responses and also suggest that the lung environment strongly biases T cell responses to Th2.
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