Responses of CD4+CD25+Foxp3+ and IL-10-secreting type I T regulatory cells to cluster-specific immunotherapy for allergic rhinitis in children

    loading  Checking for direct PDF access through Ovid


We investigated the effects of cluster specific immunotherapy (SIT) with Dermatophagoides pteronyssinus (Der p) on CD4+CD25+Foxp3+ Treg cells and IL-10-secreting type I T regulatory (Tr1) cells in Der p-sensitized children with allergic rhinitis (AR). We performed a prospective randomized study involving 46 children (aged 8–13 yr), of whom 25 children received Der p-SIT + pharmacotherapy and 21 received only pharmacotherapy, over a period of 1 yr. Prior to and at end of treatment, CD4+CD25+Foxp3+ Treg cells and allergen-specific IL-10+IL-4, IFN-γ+IL-4, and IL-4+IFN-γ-CD4+ T cells were measured by flow cytometry. Similarly, IL-4, IFN-γ, and IL-10 in supernatants from allergen-stimulated peripheral blood mononuclear cell (PBMC) cultures were measured by ELISA, and the suppressive effect of CD4+CD25high T cells on cell proliferation and cytokine release was estimated from both groups. Allergen-specific serum IgE and IgG4 were also assessed at the beginning and end of treatment by RAST and ELISA, respectively. The levels of allergen-specific Tr1 cells, IgG4, and allergen-induced IL-10 synthesis from PBMC cultures were significantly increased after SIT for 1 yr compared with baseline levels (p < 0.001 for all), with significant correlation between increased levels of Tr1 cells and improvements in nasal symptoms (r = 0.48, p < 0.05). In contrast, the levels of CD4+CD25+Foxp3+ T cells, allergen-specific Th1 and Th2 cells, the production of IL-4 and IFN-γ, and the function of CD4+CD25high T cells were not altered in either group at the end of treatment. These data suggest that the up-regulation of Tr1 cells may play an important role in SIT and be a useful marker of successful SIT in AR patients.

    loading  Loading Related Articles