Immunosuppression of TH2 responses in Trichinella spiralis infection by Helicobacter pylori neutrophil-activating protein

Background: The Helicobacter pylori neutrophil-activating protein (HP-NAP) is able to induce IL-12 expression by cells of innate immunity and to shift to TO human allergen-specific T(H)2 cells in vitro.Objective: We performed an in vivo investigation of the ability of HP-NAP to downmodulate the T(H)2 response induced in mice by Trichinella spiralis infection.Methods: Groups of T spiralis-infected BALB/c mice received intraperitoneal PBS/rat IgG2b (control animals) or 10 jig of HP-NAP with or without anti-Toll-like receptor 2 antibody on days 10 and 28 after infection. Blood eosinophils, total and T spiralis-specific IgE levels, and cytokine levels were measured in the plasma up to day 42, when splenocytes were cultured for cytokine production.Results: Although control animals showed significant eosinophilia and increase of total and T spiralis-specific IgE, IL-4, and IL-5 levels from days 10 to 14, UP-NAP-treated animals showed less eosinophilia and total and excretory/secretory antigens of T spiralis-specific IgE in the blood. HP-NAP-treated animals also had higher IL-12 and IIFN-gamma plasma levels and lower IL-4 and IL-5 levels. The addition of anti-Toll-like receptor 2 antibody abrogated the anti-T(H)2/pro-T(H)1 activity of HP-NAP.Conclusion: This study provides evidence that HP-NAP enhances endogenous IL-12 and IFN-gamma response and exerts a powerful anti-T(H)2 activity in vivo, targeting both IL-5-induced eosinophilia and IL-4-mediated hyper-IgE responses induced by parasitic infection. Q Allergy Clin Immunol 2008;122:908-13.)