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Wild rice, hypoallergenic rice—Immunologic comparison

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Abstract:

Rice is a cereal that is mainly produced and widely consumed in Asian countries including Korea. Several reports have suggested a role of IgE-mediated hypersensitivity in asthma and eczema associated with ingestion or inhalation of rice. In Japan, hypoallergenic rices are used for a substitute of common rice in some atopic patients. We performed this study to identify major allergens of rice and changed allergenicity in cooked and hypoallergenic rice. We purified crude extracts from a variety of rice and analyzed their protein distributions by sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE). Based on UniCAP test and skin-prick test, we selected sera with high sensitivity and analyzed specific IgE binding to rice by immunoblotting. In addition, the inhibition rate among some rice was determined by enzyme linked immunosorbent assay and CAP test. As the result of this study, rice with various origins and polishing levels had no difference in protein band pattern. After cooking, it was difficult to detect protein bands distributed in raw rice; and, even through IgE immunoblot analysis, it was impossible to differentiate between wild and hypoallergenic rice. In addition, both wild and hypoallergenic rice still had IgE binding activity on their remaining protein bands. In conclusion, almost all proteins of rice were excluded or weakened in the process of boiling and IgE binding activity still remained even in hypoallergenic rice.

Document Type: Research Article

DOI: https://doi.org/10.2500/aap.2006.27.2876

Publication date: 2006-07-01

More about this publication?
  • Allergy and Asthma Proceedings is a peer reviewed publication dedicated to distributing timely scientific research regarding advancements in the knowledge and practice of allergy, asthma and immunology. Its primary readership consists of allergists and pulmonologists.

    The goal of the Proceedings is to publish articles with a predominantly clinical focus which directly impact quality of care for patients with allergic disease and asthma.

    Featured topics include asthma, rhinitis, sinusitis, food allergies, allergic skin diseases, diagnostic techniques, allergens, and treatment modalities. Published material includes peer-reviewed original research, clinical trials and review articles.

    Articles marked "F" offer free full text for personal noncommercial use only.

    The journal is indexed in Thomson Reuters Web of Science and Science Citation Index Expanded, plus the National Library of Medicine's PubMed service.
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