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Homologous tropomyosins from vertebrate and invertebrate: Recombinant calibrator proteins in functional biological assays for tropomyosin allergenicity assessment of novel animal foods
BACKGROUND: Novel foods may provide new protein sources for a growing world population but entail risks of unexpected food‐allergic reactions. No guidance on allergenicity assessment of novel foods exists, while for genetically modified (GM) crops it includes comparison of sequence identity with kno...
Autores principales: | , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
John Wiley and Sons Inc.
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6973240/ https://www.ncbi.nlm.nih.gov/pubmed/31541579 http://dx.doi.org/10.1111/cea.13503 |
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author | Klueber, Julia Costa, Joana Randow, Stefanie Codreanu‐Morel, Françoise Verhoeckx, Kitty Bindslev‐Jensen, Carsten Ollert, Markus Hoffmann‐Sommergruber, Karin Morisset, Martine Holzhauser, Thomas Kuehn, Annette |
author_facet | Klueber, Julia Costa, Joana Randow, Stefanie Codreanu‐Morel, Françoise Verhoeckx, Kitty Bindslev‐Jensen, Carsten Ollert, Markus Hoffmann‐Sommergruber, Karin Morisset, Martine Holzhauser, Thomas Kuehn, Annette |
author_sort | Klueber, Julia |
collection | PubMed |
description | BACKGROUND: Novel foods may provide new protein sources for a growing world population but entail risks of unexpected food‐allergic reactions. No guidance on allergenicity assessment of novel foods exists, while for genetically modified (GM) crops it includes comparison of sequence identity with known allergens, digestibility tests and IgE serum screening. OBJECTIVE: As a proof of concept, to evaluate non‐/allergenic tropomyosins (TMs) regarding their potential as new calibrator proteins in functional biological in vitro assays for the semi‐quantitative allergy risk assessment of novel TM‐containing animal foods with mealworm TM as an example. METHODS: Purified TMs (shrimp, Penaeus monodon; chicken Gallus gallus; E coli overexpression) were compared by protein sequencing, circular dichroism analysis and in vitro digestion. IgE binding was quantified using shrimp‐allergic patients' sera (ELISA). Biological activities were investigated (skin testing; titrated basophil activation tests, BAT), compared to titrated biological mediator release using humanized rat basophil leukaemia (RBL) cells. RESULTS: Shrimp and chicken TMs showed high sequence homology, both alpha‐helical structures and thermal stability. Shrimp TM was stable during in vitro gastric digestion, chicken TM degraded quickly. Both TMs bound specific IgE from shrimp‐allergic patients (significantly higher for shrimp TM), whereas skin reactivity was mostly positive with only shrimp TM. BAT and RBL cell assays were positive with shrimp and chicken TM, although at up to 100‐ to 1000‐times lower allergen concentrations for shrimp than chicken TM. In RBL cell assays using both TM as calibrators, an activation of effector cells by mealworm TM similar to that by shrimp TM confirmed the already reported high allergenic potency of mealworm TM as a novel protein source. CONCLUSIONS & CLINICAL RELEVANCE: According to current GM crops' allergenicity assessment, non‐allergenic chicken TM could falsely be considered an allergen on a weight‐of‐evidence approach. However, calibrating allergenic potency in functional BAT and RBL cell assays with clinically validated TMs allowed for semi‐quantitative discrimination of novel food protein's allergenicity. With TM calibration as a proof of concept, similar systems of homologous protein might be developed to scale on an axis of allergenicity. |
format | Online Article Text |
id | pubmed-6973240 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | John Wiley and Sons Inc. |
record_format | MEDLINE/PubMed |
spelling | pubmed-69732402020-01-27 Homologous tropomyosins from vertebrate and invertebrate: Recombinant calibrator proteins in functional biological assays for tropomyosin allergenicity assessment of novel animal foods Klueber, Julia Costa, Joana Randow, Stefanie Codreanu‐Morel, Françoise Verhoeckx, Kitty Bindslev‐Jensen, Carsten Ollert, Markus Hoffmann‐Sommergruber, Karin Morisset, Martine Holzhauser, Thomas Kuehn, Annette Clin Exp Allergy Original Articles BACKGROUND: Novel foods may provide new protein sources for a growing world population but entail risks of unexpected food‐allergic reactions. No guidance on allergenicity assessment of novel foods exists, while for genetically modified (GM) crops it includes comparison of sequence identity with known allergens, digestibility tests and IgE serum screening. OBJECTIVE: As a proof of concept, to evaluate non‐/allergenic tropomyosins (TMs) regarding their potential as new calibrator proteins in functional biological in vitro assays for the semi‐quantitative allergy risk assessment of novel TM‐containing animal foods with mealworm TM as an example. METHODS: Purified TMs (shrimp, Penaeus monodon; chicken Gallus gallus; E coli overexpression) were compared by protein sequencing, circular dichroism analysis and in vitro digestion. IgE binding was quantified using shrimp‐allergic patients' sera (ELISA). Biological activities were investigated (skin testing; titrated basophil activation tests, BAT), compared to titrated biological mediator release using humanized rat basophil leukaemia (RBL) cells. RESULTS: Shrimp and chicken TMs showed high sequence homology, both alpha‐helical structures and thermal stability. Shrimp TM was stable during in vitro gastric digestion, chicken TM degraded quickly. Both TMs bound specific IgE from shrimp‐allergic patients (significantly higher for shrimp TM), whereas skin reactivity was mostly positive with only shrimp TM. BAT and RBL cell assays were positive with shrimp and chicken TM, although at up to 100‐ to 1000‐times lower allergen concentrations for shrimp than chicken TM. In RBL cell assays using both TM as calibrators, an activation of effector cells by mealworm TM similar to that by shrimp TM confirmed the already reported high allergenic potency of mealworm TM as a novel protein source. CONCLUSIONS & CLINICAL RELEVANCE: According to current GM crops' allergenicity assessment, non‐allergenic chicken TM could falsely be considered an allergen on a weight‐of‐evidence approach. However, calibrating allergenic potency in functional BAT and RBL cell assays with clinically validated TMs allowed for semi‐quantitative discrimination of novel food protein's allergenicity. With TM calibration as a proof of concept, similar systems of homologous protein might be developed to scale on an axis of allergenicity. John Wiley and Sons Inc. 2019-10-11 2020-01 /pmc/articles/PMC6973240/ /pubmed/31541579 http://dx.doi.org/10.1111/cea.13503 Text en © 2019 The Authors. Clinical & Experimental Allergy published by John Wiley & Sons Ltd. This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Original Articles Klueber, Julia Costa, Joana Randow, Stefanie Codreanu‐Morel, Françoise Verhoeckx, Kitty Bindslev‐Jensen, Carsten Ollert, Markus Hoffmann‐Sommergruber, Karin Morisset, Martine Holzhauser, Thomas Kuehn, Annette Homologous tropomyosins from vertebrate and invertebrate: Recombinant calibrator proteins in functional biological assays for tropomyosin allergenicity assessment of novel animal foods |
title | Homologous tropomyosins from vertebrate and invertebrate: Recombinant calibrator proteins in functional biological assays for tropomyosin allergenicity assessment of novel animal foods |
title_full | Homologous tropomyosins from vertebrate and invertebrate: Recombinant calibrator proteins in functional biological assays for tropomyosin allergenicity assessment of novel animal foods |
title_fullStr | Homologous tropomyosins from vertebrate and invertebrate: Recombinant calibrator proteins in functional biological assays for tropomyosin allergenicity assessment of novel animal foods |
title_full_unstemmed | Homologous tropomyosins from vertebrate and invertebrate: Recombinant calibrator proteins in functional biological assays for tropomyosin allergenicity assessment of novel animal foods |
title_short | Homologous tropomyosins from vertebrate and invertebrate: Recombinant calibrator proteins in functional biological assays for tropomyosin allergenicity assessment of novel animal foods |
title_sort | homologous tropomyosins from vertebrate and invertebrate: recombinant calibrator proteins in functional biological assays for tropomyosin allergenicity assessment of novel animal foods |
topic | Original Articles |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6973240/ https://www.ncbi.nlm.nih.gov/pubmed/31541579 http://dx.doi.org/10.1111/cea.13503 |
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