Suppression of allergic response by CpG motif oligodeoxynucleotide- house-dust mite conjugate in animal model of allergic rhinitis
Authors: Mo, Ji-Hun; Park, Seok-Won; Rhee, Chae-Seo; Takabayashi, Kenji; Lee, Seung Sin; Quan, Song-Hua; Kim, In-Sang; Min, Yang-Gi; Raz, Eyal; Lee, Chul Hee
Source: American Journal of Rhinology, Volume 20, Number 2, March-April 2006 , pp. 212-218(7)
Publisher: OceanSide Publications, Inc
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Abstract:
Background: Although there have been many therapeutic options for allergic disease, the true allergen desensitization remains a challenging goal. The classic immunotherapy has a limited efficacy, is inconvenient, and has a risk of anaphylaxis. Recent reports revealed that immunostimulatory DNA sequences (ISS-oligdeoxynucleotide [ODN], CpG motif) act as a strong Th1 response-inducing adjuvants and that DNA-based vaccination might be an effective therapeutic option. In this study, we investigate whether ISS-ODN/Dermatophagoides farinae (Der f) conjugate has antiallergic effects in the allergic rhinitis mouse model, sensitive to house-dust mites. Der f is the most common allergen-inducing allergic rhinitis in Korea.Methods: C57BL/6 mice were sensitized with crude extract of Der f. After injection of ISS-ODN or ISS-ODN/Der f conjugate, several parameters of allergic response were evaluated.Results: Scratching and sneezing symptoms and eosinophilic infiltration into nasal mucosa were suppressed by injection with ISS-ODN only and ISS-ODN/Der f conjugate. Interleukin-5 level was decreased and interferon γ level was increased in nasal lavage fluid by injection of ISS-ODN/Der f conjugate. Der f-specific immunoglobulin E was decreased by injection of ISS-ODN or Der f /ISS-ODN conjugate; however, these were not statistically significant. Transforming growth factor β1 secreted by cultured splenocyte was increased significantly in ISS-ODN/Der f conjugate group.Conclusion: These results suggest ISS-ODN/Der f conjugate induces an antiallergic effect and induces an increase in transforming growth factor β1 level in the allergic rhinitis model using Der f allergen. Allergic response developed by Der f allergen could be more effectively reduced by injection with ISS-ODN/Der f conjugate than by injection with ISS-ODN only.Document Type: Research article
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