Mucosal IFN-γ Gene Transfer Inhibits Pulmonary Allergic Responses in Mice

Th2 cytokines are associated with the airway inflammation and hyperreactivity in allergic asthma and are potential targets for developing novel therapies. The efficacy of a mucosal cytokine-gene transfer approach was examined in a mouse model for allergic asthma. We showed first that mucosal IFN-γ gene transfer results in a significant expression of IFN-γ in the pulmonary epithelium. Significantly, this approach inhibits both Ag- and Th2-cell-induced pulmonary eosinophilia and airway hyperreactivity. These findings suggest that mucosal IFN-γ gene transfer is effective in modulating pulmonary allergic responses and provides a basis for developing a novel therapeutic approach.