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Soybean allergy in a population with a low prevalence of betulacae pollen allergy and a high soybean consumption
© Fukutomi et al; licensee BioMed Central Ltd. 2011
Published: 12 August 2011
Recent evidence has shown that birch pollen-related soybean allergy mediated by Gly m 4 is common in central Europe. However, the impact of sensitization to Gly m 4 in soybean allergic patients in a population with a low prevalence of Betulaceae pollen allergy and a high soybean consumption is unknown.
The aim of this study was to elucidate the prevalence of sensitization to rGly m 4 in adults with soybean allergy, and to analyze the diagnostic efficiency of the IgE antibody to rGly m 4 (ImmunoCAP®) in soybean allergy in central Japan. Twenty-one soybean-allergic patients were prospectively recruited from Jan. to Dec. 2009, and their levels of IgE antibody to rGly m 4 were compared with those of general alder pollen-allergic control subjects without soybean allergy (n=85).
Although sensitization to alder pollen was not prevalent in the general outpatients of allergy departments, all the soybean–allergic patients were sensitized to alder pollen and rGly m 4. Sixty-two percent of the general alder pollen-allergic control subjects were also sensitized to rGly m 4. However, the levels of IgE antibody to rGly m 4 in soybean-allergic patients were markedly higher than those in alder pollen-allergic control subjects. The area under the receiver-operating characteristics curve for levels of IgE antibody to rGly m 4 in the diagnosis of soybean allergy was 0.86, which was significantly higher than that to the natural soybean extracts.
A strong relationship between adult soybean allergy and sensitization to rGly m 4 was also observed in this population with high soybean consumption. The level of IgE antibody to CAP-rGly m 4 was an effective tool in discriminating soybean allergy from general alder pollen-allergy. This result highlights the impact of respiratory allergy to pollen-derived cross-reactive allergens on the epidemics of adult plant food allergy.
This article is published under license to BioMed Central Ltd. This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.