Cooking birch pollen–related food: Divergent consequences for IgE- and T cell–mediated reactivity in vitro and in vivo - 17/08/11
, Bettina Zwölfer a, Annice Heratizadeh, MD b, Beatrice Jahn-Schmid, PhD a, Yuliya Dall Antonia, PhD c, Mareike Alter, MD b, Walter Keller, PhD c, Laurian Zuidmeer, PhD d, Ronald van Ree, PhD d, Thomas Werfel, MD b, Christof Ebner, MD e
Reprint requests: Barbara Bohle, PhD, Medical University of Vienna, Center for Physiology and Pathophysiology, Department of Pathophysiology, Waehringer Guertel 18-20, AKH-3Q A-1090 Wien, Austria.Vienna and Graz, Austria, Hannover, Germany, and Amsterdam, The Netherlands
Abstract |
Background |
The major birch pollen allergen Bet v 1 cross-reacts with homologous food allergens, resulting in IgE-mediated oral allergy syndromes (OASs). To avoid this food, allergy allergologists and guidebooks advise patients to consume birch pollen–related foods after heating.
Objective |
We sought to evaluate whether cooked Bet v 1–related food allergens induce IgE- and T cell–mediated reactions in vitro and in vivo.
Methods |
Recombinant Bet v 1, Mal d 1 (apple), Api g 1 (celery), and Dau c 1 (carrot) were incubated at increasing temperatures. Protein structures were determined by means of circular dichroism. Mediator release was tested in basophil activation assays. PBMCs and Bet v 1–specific T-cell lines with known epitope specificity were stimulated with native and cooked food allergens. Patients with birch pollen allergy who experienced OAS and the exacerbation of atopic dermatitis (AD) on ingestion of fresh apple, celery, or carrot were retested in double-blind, placebo-controlled food challenges with the respective foods in cooked form.
Results |
In vitro, cooked food allergens lost the capacity to bind IgE and to induce mediator release but had the same potency to activate Bet v 1–specific T cells as native proteins. In vivo, ingestion of cooked birch pollen–related foods did not induce OAS but caused atopic eczema to worsen.
Conclusion |
T-cell cross-reactivity between Bet v 1 and related food allergens occurs independently of IgE cross-reactivity in vitro and in vivo. In patients with AD, the resulting immune reaction can even manifest as late eczematous skin reactions. Therefore the view that cooked pollen-related foods can be consumed without allergologic consequences should be reconsidered.
Clinical implications |
Symptom-free consumed pollen-related food allergens might cause T cell–mediated late-phase skin reactions in patients with pollen allergy and AD.
El texto completo de este artículo está disponible en PDF.Key words : Birch pollen allergy, food allergy, oral allergy syndrome, atopic dermatitis, pathogenesis-related protein family 10, Bet v 1, cross-reactivity
Abbreviations used : aa, AD, DBPCFC, OAS, PR-10, RBL, TCL, Tm
Esquema
| Supported by the Fonds zur Förderung der wissenschaftlichen Forschung (SFB-F1807-B04 to B. Bohle, F1805-B04 to W. Keller) and Biomay, Austria. Disclosure of potential conflict of interest: R. van Ree has consultant arrangements with HAL Allergy BV, Stallergenes SA, and Ventria Bioscience and has received grants from HAL Allergy BV and Stallergenes SA. The rest of the authors have declared that they have no conflict of interest. |
Vol 118 - N° 1
P. 242-249 - juillet 2006 Regresar al número
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