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  • Title: Immunologic response to administration of standardized dog allergen extract at differing doses.
    Author: Lent AM, Harbeck R, Strand M, Sills M, Schmidt K, Efaw B, Lebo T, Nelson HS.
    Journal: J Allergy Clin Immunol; 2006 Dec; 118(6):1249-56. PubMed ID: 17157654.
    Abstract:
    BACKGROUND: The immunologic response to immunotherapy with dog extract is not well characterized. OBJECTIVE: The purpose of this study was to examine the immunologic response to 3 doses of dog extract expressed as their Can f 1 content. METHODS: Cluster immunotherapy was administered to 28 patients with dog allergy who were randomly assigned to 1 of 4 treatment arms: placebo or acetone-precipitated extract containing 0.6 mug, 3.0 mug, or 15.0 mug Can f 1 per 0.5 mL maintenance dose. Studies included titrated skin prick tests, the late cutaneous response, titrated nasal challenge with dog extract, and serum allergen-specific IgE and IgG(4). Dog allergen-stimulated lymphocyte proliferation was performed with measurement of secreted cytokines by ELISA and of intracellular cytokines by flow cytometry. RESULTS: There was a significant dose-dependent response in suppression of titrated skin prick tests and suppression of the late cutaneous response. There was a significant increase from baseline in dog-specific IgG(4) in both the high-dose and low-dose groups and a dose-dependent suppression of secreted TNF-alpha and increase in secreted TGF-beta. There was a dose-dependent trend in suppression of secreted IL-4 with a significant decrease from baseline in the high-dose group. There were no significant changes in symptom scores; lymphocyte proliferation; secreted IFN-gamma, IL-10, or IL-5; or intracellular cytokine production. CONCLUSION: The dose-response in immunologic parameters after immunotherapy with dog extract is similar to that previously demonstrated with cat extract. CLINICAL IMPLICATIONS: The greatest and most consistent response is seen with a dose containing 15 mug Can f 1.
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