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* Departments of Medicine and Microbiology and Immunology,
Howard Hughes Medical Institute, University of California, San Francisco, CA 94143
To study the effects of chronic Ag deposition in the airway mucosa on CD4+ T cell priming and subsequent airway disease, transgenic mice were generated that expressed OVA under the control of the surfactant protein C promoter. CD4 T cells from these mice were tolerant to OVA but this was overcome among spleen CD4 T cells by crossing to OVA-specific DO11.10 TCR-transgenic mice. Lungs from the double-transgenic mice developed lymphocytic infiltrates and modest mucus cell hyperplasia. Infiltrating cells were unaffected by the absence of either Rag-1 or Stat6, although the latter deficiency led to the disappearance of mucus. In the lung of double-transgenic mice, a large number of Ag-specific CD4 T cells expressed CD25 and functioned as regulatory T cells. The CD25+ CD4 T cells suppressed proliferation of CD25- CD4 T cells in vitro and inhibited type 2 immune responses induced by aerosolized Ags in vivo. Despite their ability to suppress allergic type 2 immunity in the airways, however, CD25+ CD4 regulatory T cells had no effect on the development of bronchial hyperreactivity.
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