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Department of Immunology and Infectious Diseases, Harvard School of Public Health, Boston, MA 02115; and
Department of Otorhinolaryngology, Okayama University Medical School, Okayama, Japan
Infection with the helminth parasite Schistosoma mansoni induces a pronounced Th2-type response that is associated with significant IgE production. To better understand how the parasite drives these responses, we investigated the relative roles of proteins and carbohydrates in driving Th2-type and/or IgE responses using a murine model of intranasal sensitization with soluble egg Ags (SEA) of Schistosoma mansoni. We found that repeated intranasal sensitization with soluble egg Ags led to the induction of both total and specific IgE production and nasal eosinophilia. By comparing the responses of mice sensitized with SEA or metaperiodate-treated SEA we were able to demonstrate that carbohydrates on SEA are the major inducers of IgE production and nasal recruitment of eosinophils. Mice sensitized with periodate-treated SEA displayed a significant decrease in both total and specific IgE levels in comparison to mice sensitized with native SEA. Furthermore, sensitization of mice with periodate-treated SEA significantly reduced levels of Ag-specific IgG1, but had no effect on IgG2a production. Nasal lymphocytes from mice sensitized with native SEA, but not with periodate-treated SEA, produced IL-4, IL-5, and IL-10 when restimulated with native SEA in vitro. On the other hand, lymphocytes from mice sensitized with periodate-treated SEA did not produce any of these same cytokines following in vitro restimulation, suggesting that carbohydrates were required for in vivo induction of Th2 response and for that of associated cytokine responses in this model. Lastly, competitive inhibition ELISA showed that although carbohydrates are required for SEA-specific IgE induction, they are not targets of the induced IgE response.
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