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Letter
Nature Medicine 11, 446 - 449 (2005)
Published online: 27 March 2005 | doi:10.1038/nm1219
A chimeric human-cat fusion protein blocks cat-induced allergy
Daocheng Zhu1,3, Christopher L Kepley2,3, Ke Zhang1,3, Tetsuya Terada1,3, Takechiyo Yamada1 & Andrew Saxon1
Abstract
Animal allergens are an important cause of asthma and allergic rhinitis. We designed and tested a chimeric human-cat fusion protein composed of a truncated human IgG Fc
1 and the major cat allergen Fel d1, as a proof of concept for a new approach to allergy immunotherapy. This Fc-Fel d1 protein induced dose-dependent inhibition of Fel d1-driven IgE-mediated histamine release from cat-allergic donors' basophils and sensitized human cord blood-derived mast cells. Such inhibition was associated with altered Syk and ERK signaling. The Fc-Fel d1 protein also blocked in vivo reactivity in Fc
RI
transgenic mice passively sensitized with human IgE antibody to cat and in Balb/c mice actively sensitized against Fel d1. The Fc-Fel d1 protein alone did not induce mediator release. Chimeric human Fc-allergen fusion proteins may provide a new therapeutic platform for the immune-based therapy of allergic disease.
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