Reduction of memory Th2 cell pool for the treatment of allergic diseases

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The characteristics of asthma are mainly mediated by antigen-specific memory Th2 cells and their cytokines including IL-4, IL-5, and IL-13. In this study, we tried to identify cell surface molecules specific for memory Th2 cells by using DNA microarray analysis and retrovirus-mediated signal sequence trap screening. However, unfortunately, we could not identify memory Th2 cell-specific molecules within this research period. On the other hand, we found that prolonged Th2-type immune inflammation in the lung induces the expression of IL-25 and pulmonary arterial remodeling (PAR). Injection of anti-IL-25 antibody inhibited antigen-induced PAR. Lung-specificIL-25 transgenic mice (CC10 IL-25 mice) but not CC10 IL-25 NKT^<-/-> mice spontaneouslydeveloped PAR. These results suggest that prolonged expression of IL-25 in the lung induces PARby NKT cell-dependent mechanisms.