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Immunol Allergy Clin North Am. 2007 Feb;27(1):93-103.

Chimeric human fcgamma-allergen fusion proteins in the prevention of allergy.

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  • 1The Hart and Louise Lyon Laboratory, Division of Clinical Immunology/Allergy, Department of Medicine, UCLA School of Medicine, 52-175 CHS, 10833 Le Conte Avenue, Los Angeles, CA 90095-1680, USA.


Allergic responses are strongly associated with Th2-type immune responses, and modulation of the skewed Th2 response toward a more balanced response is the major goal of allergen immunotherapy (IT) in allergic disorders. To achieve this goal, several approaches have been tested. The authors previously showed that a human immunoglobulin (Ig) Fcgamma-Fcvarepsilon fusion protein (GE2) that directly cross-links FcvarepsilonRI and FcgammaRIIb on human mast cells and basophils was able to inhibit degranulation, and they reasoned that human gamma-allergen fusion protein would achieve a similar inhibitory effect in an allergen-specific fashion while preserving the immunogenicity of the allergen component. Therefore, the authors constructed and developed a human-cat chimeric fusion protein composed of the human Fcgamma1 and the cat allergen Fel d1 (Felis domesticus) for cat allergen-specific IT. This article summarizes the therapeutic features and potential of this novel fusion protein for allergic IT.

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