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Román‐Carrasco P, Klug C, Hemmer W, Focke‐Tejkl M, Raith M, Grosinger I, Stoll P, Quirce S, Sanchez‐Jareño M, Martínez‐Blanco M, Molina E, Somoza V, Lieder B, Marin Z, Nöbauer K, Hummel K, Razzazi‐Fazeli E, Swoboda I. Bos d 13, A Novel Heat-Stable Beef Allergen. Mol Nutr Food Res 2023; 67:e2200601. [PMID: 37173826 PMCID: PMC10909433 DOI: 10.1002/mnfr.202200601] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Revised: 03/24/2023] [Indexed: 05/15/2023]
Abstract
SCOPE Red meat, a staple food of Western diets, can also induce IgE-mediated allergic reactions. Yet, apart from the heat-labile protein serum albumin and the carbohydrate α-Gal, the molecules causing allergic reactions to red meat remain unknown. METHODS AND RESULTS IgE reactivity profiles of beef-sensitized individuals are analyzed by IgE-immunoblotting with protein extracts from raw and cooked beef. Two IgE-reactive proteins are identified by peptide mass fingerprinting as myosinlight chain 1 (MYL1) and myosin light chain 3 (MYL3) in cooked beef extract and are designated Bos d 13 isoallergens. MYL1 and MYL3 are produced recombinantly in Escherichia coli. ELISAs proved their IgE reactivity and circular dichroism analysis showed that they represent folded molecules with remarkable thermal stability. In vitro gastrointestinal digestion experiments showed the higher stability of rMYL1 as compared to rMYL3. Exposure of a monolayer of Caco-2 cells to rMYL1 indicated that the molecule is able to cross intestinal epithelial cells without disturbing the integrity of the tight junctions, suggesting the sensitizing capacity of MYL1. CONCLUSION MYLs are identified as novel heat-stable bovine meat allergens.
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Affiliation(s)
- Patricia Román‐Carrasco
- Biotechnology SectionFH Campus WienCampus Vienna BiocenterUniversity of Applied SciencesVienna1100Austria
| | - Christoph Klug
- Biotechnology SectionFH Campus WienCampus Vienna BiocenterUniversity of Applied SciencesVienna1100Austria
- Present address: MacroArray Diagnostics GmbHVienna1230Austria
| | | | - Margarete Focke‐Tejkl
- Division of ImmunopathologyDepartment of Pathophysiology and Allergy ResearchCenter for PathophysiologyInfectiology and ImmunologyMedical University of ViennaVienna1090Austria
| | - Marianne Raith
- Biotechnology SectionFH Campus WienCampus Vienna BiocenterUniversity of Applied SciencesVienna1100Austria
| | - Isabella Grosinger
- Biotechnology SectionFH Campus WienCampus Vienna BiocenterUniversity of Applied SciencesVienna1100Austria
| | - Peter Stoll
- Biotechnology SectionFH Campus WienCampus Vienna BiocenterUniversity of Applied SciencesVienna1100Austria
| | - Santiago Quirce
- Department of AllergyLa Paz University Hospital, IdiPAZMadrid28046Spain
| | | | - Mónica Martínez‐Blanco
- Instituto de Investigación en Ciencias de la Alimentación (CIAL, CSIC‐UAM)Madrid28049Spain
| | - Elena Molina
- Instituto de Investigación en Ciencias de la Alimentación (CIAL, CSIC‐UAM)Madrid28049Spain
| | - Veronika Somoza
- Department of Physiological ChemistryFaculty of ChemistryUniversity of ViennaVienna1090Austria
- Leibniz Institute for Food Systems BiologyTechnical University Munich85354MunichGermany
| | - Barbara Lieder
- Department of Physiological ChemistryFaculty of ChemistryUniversity of ViennaVienna1090Austria
| | - Zana Marin
- Biotechnology SectionFH Campus WienCampus Vienna BiocenterUniversity of Applied SciencesVienna1100Austria
| | - Katharina Nöbauer
- VetCore Facility for ResearchUniversity of Veterinary MedicineVienna1210Austria
| | - Karin Hummel
- VetCore Facility for ResearchUniversity of Veterinary MedicineVienna1210Austria
| | | | - Ines Swoboda
- Biotechnology SectionFH Campus WienCampus Vienna BiocenterUniversity of Applied SciencesVienna1100Austria
- Division of ImmunopathologyDepartment of Pathophysiology and Allergy ResearchCenter for PathophysiologyInfectiology and ImmunologyMedical University of ViennaVienna1090Austria
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2
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Poultry Meat allergy: a Review of Allergens and Clinical Phenotypes. CURRENT TREATMENT OPTIONS IN ALLERGY 2022. [DOI: 10.1007/s40521-022-00309-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Abstract
Purpose of review
In the recent years, more cases of poultry meat allergy, both IgE- or non-IgE-mediated, are being reported. Patients have varied clinical reactivity at various levels of sensitivity to different meat preparations. The lack of validated biomarkers renders accurate diagnosis challenging. In this review, we aim to provide an overview of the current status of poultry meat allergy along with a description on the allergens implicated.
Recent findings
Poultry meat allergy occurs as a result of cross-reactions with known allergens of egg yolk or bird feathers or as genuine IgE-mediated sensitivity to allergens in poultry meat. Individuals can also develop non-IgE-mediated hypersensitivity reactions to poultry meat. Chicken serum albumin is the main responsible allergen in secondary cases, while myosin light chain, α parvalbumin, enolase, aldolase, hemoglobin, and α-actin have been recognized as potential eliciting allergens in genuine poultry meat allergy.
Summary
There is a wide phenotypic variation among patients with poultry meat allergy, regarding clinical severity and cross-reactivity features. Recognizing the various clinical entities of reactions to poultry meat is an important step towards accurate diagnosis and providing management options that are well received by patients.
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3
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Jiang X, Mu H, Hsieh YHP, Rao Q. Isolation and Characterization of Chicken Serum Albumin (Hen Egg Alpha-Livetin, Gal d 5). Foods 2022; 11:foods11111637. [PMID: 35681387 PMCID: PMC9180759 DOI: 10.3390/foods11111637] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2022] [Revised: 05/26/2022] [Accepted: 05/30/2022] [Indexed: 11/16/2022] Open
Abstract
Chicken serum albumin, i.e., hen egg alpha-livetin, is a recognized food allergen in chicken meat and hen eggs. Currently, there is no immunoassay available for its detection from food matrices. The characterization of chicken serum albumin-specific antibodies and the extraction of the target protein are essential for immunoassay development. One monoclonal antibody (mAb), 3H4, was used in this study due to its selectivity to a linear epitope on avian serum albumin. To study the extraction of chicken serum albumin, phosphate-buffered saline (PBS) with two additives, i.e., sodium dodecyl sulfate (SDS) and dithiothreitol (DTT), was used for its extraction from chicken blood plasma and hen egg yolk. SDS and DTT improved the chicken serum albumin’s recovery and enhanced chicken serum albumin’s immunodetection. In addition, chicken serum albumin retained the best solubility and immunoreactivity after heat treatment in a neutral condition. It experienced degradation and aggregation in acidic and alkaline conditions, respectively. Overall, PBS containing 0.1% SDS and 1 mM DTT (pH 7.2) was a better extraction buffer for chicken serum albumin. However, the complexity of the food matrix and elevated temperature could reduce its solubility and immunoreactivity.
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Affiliation(s)
- Xingyi Jiang
- Department of Nutrition and Integrative Physiology, Florida State University, Tallahassee, FL 32306, USA; (X.J.); (Y.-H.P.H.)
| | - Han Mu
- Novavax, Inc., Gaithersburg, MD 20878, USA;
| | - Yun-Hwa Peggy Hsieh
- Department of Nutrition and Integrative Physiology, Florida State University, Tallahassee, FL 32306, USA; (X.J.); (Y.-H.P.H.)
| | - Qinchun Rao
- Department of Nutrition and Integrative Physiology, Florida State University, Tallahassee, FL 32306, USA; (X.J.); (Y.-H.P.H.)
- Correspondence: ; Tel.: +1-850-644-1829
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4
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Chaora NS, Khanyile KS, Magwedere K, Pierneef R, Tabit FT, Muchadeyi FC. A 16S Next Generation Sequencing Based Molecular and Bioinformatics Pipeline to Identify Processed Meat Products Contamination and Mislabelling. Animals (Basel) 2022; 12:ani12040416. [PMID: 35203124 PMCID: PMC8868451 DOI: 10.3390/ani12040416] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Revised: 09/28/2021] [Accepted: 10/07/2021] [Indexed: 12/03/2022] Open
Abstract
Simple Summary Meat adulteration and fraud encompasses the deliberate fraudulent addition or substitution of proteins of animal or plant origin in edible products primarily for economic gain. The mitochondrial 16S ribosomal (rRNA) gene was used to identify species that are present in pure and processed meat samples. The meat samples were sequenced using an Illumina sequencing platform, and bioinformatics analysis was carried out for species identification. The results indicated that pork was the major contaminant in most of the meat samples. The bioinformatics pipeline demonstrated its specificity through identification of species specific and quantification of the contamination levels across all samples. Food business operators and regulatory sectors can validate this method for food fraud checks and manage any form of mislabeling in the animal or plant protein food ecosystem. Abstract Processed meat is a target in meat adulteration for economic gain. This study demonstrates a molecular and bioinformatics diagnostic pipeline, utilizing the mitochondrial 16S ribosomal RNA (rRNA) gene, to determine processed meat product mislabeling through Next-Generation Sequencing. Nine pure meat samples were collected and artificially mixed at different ratios to verify the specificity and sensitivity of the pipeline. Processed meat products (n = 155), namely, minced meat, biltong, burger patties, and sausages, were collected across South Africa. Sequencing was performed using the Illumina MiSeq sequencing platform. Each sample had paired-end reads with a length of ±300 bp. Quality control and filtering was performed using BBDuk (version 37.90a). Each sample had an average of 134,000 reads aligned to the mitochondrial genomes using BBMap v37.90. All species in the artificial DNA mixtures were detected. Processed meat samples had reads that mapped to the Bos (90% and above) genus, with traces of reads mapping to Sus and Ovis (2–5%) genus. Sausage samples showed the highest level of contamination with 46% of the samples having mixtures of beef, pork, or mutton in one sample. This method can be used to authenticate meat products, investigate, and manage any form of mislabeling.
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Affiliation(s)
- Nyaradzo Stella Chaora
- Department of Life and Consumer Sciences, College of Agriculture and Environmental Sciences, University of South Africa, Rooderpoort 1709, South Africa; (N.S.C.); (F.T.T.)
- Biotechnology Platform, Agricultural Research Council, Private Bag X 05, Onderstepoort, Pretoria 0110, South Africa; (K.S.K.); (R.P.)
| | - Khulekani Sedwell Khanyile
- Biotechnology Platform, Agricultural Research Council, Private Bag X 05, Onderstepoort, Pretoria 0110, South Africa; (K.S.K.); (R.P.)
| | - Kudakwashe Magwedere
- Directorate of Veterinary Public Health, Department of Agriculture, Land Reform and Rural Development, Pretoria 0001, South Africa;
| | - Rian Pierneef
- Biotechnology Platform, Agricultural Research Council, Private Bag X 05, Onderstepoort, Pretoria 0110, South Africa; (K.S.K.); (R.P.)
| | - Frederick Tawi Tabit
- Department of Life and Consumer Sciences, College of Agriculture and Environmental Sciences, University of South Africa, Rooderpoort 1709, South Africa; (N.S.C.); (F.T.T.)
| | - Farai Catherine Muchadeyi
- Biotechnology Platform, Agricultural Research Council, Private Bag X 05, Onderstepoort, Pretoria 0110, South Africa; (K.S.K.); (R.P.)
- Correspondence:
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5
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Vanegas E, Felix M, Farfán Bajaña MJ, Robles-Velasco K, Panchana Lascano M, Crespo Shijin C, Hinostroza Logroño R, Greiding L, Cherrez-Ojeda I. An approach to a patient with suspected meat allergy due to underlying alpha gal syndrome in a resource-limited setting: A case report. JAAD Case Rep 2022; 21:173-175. [PMID: 35252518 PMCID: PMC8888892 DOI: 10.1016/j.jdcr.2022.01.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Affiliation(s)
- Emanuel Vanegas
- Respiralab Research Group, Guayaquil, Ecuador
- Universidad de Especialidades Espíritu Santo, Samborondón, Ecuador
| | - Miguel Felix
- Respiralab Research Group, Guayaquil, Ecuador
- Universidad de Especialidades Espíritu Santo, Samborondón, Ecuador
| | - María José Farfán Bajaña
- Respiralab Research Group, Guayaquil, Ecuador
- Universidad de Especialidades Espíritu Santo, Samborondón, Ecuador
| | - Karla Robles-Velasco
- Respiralab Research Group, Guayaquil, Ecuador
- Universidad de Especialidades Espíritu Santo, Samborondón, Ecuador
| | | | - Carolina Crespo Shijin
- Respiralab Research Group, Guayaquil, Ecuador
- Universidad de Especialidades Espíritu Santo, Samborondón, Ecuador
| | - Romina Hinostroza Logroño
- Respiralab Research Group, Guayaquil, Ecuador
- Universidad de Especialidades Espíritu Santo, Samborondón, Ecuador
| | - Leonardo Greiding
- Instituto Argentino de Alergia e Inmunología, Buenos Aires, Argentina
| | - Iván Cherrez-Ojeda
- Respiralab Research Group, Guayaquil, Ecuador
- Universidad de Especialidades Espíritu Santo, Samborondón, Ecuador
- Correspondence to: Iván Cherrez-Ojeda, MD, MSc, Universidad Espíritu Santo, School of Medicine, Km. 2.5 vía La Puntilla, Samborondón, Guayas 0901952, Ecuador.
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6
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Dirong G, Nematbakhsh S, Selamat J, Chong PP, Idris LH, Nordin N, Fatchiyah F, Abdull Razis AF. Omics-Based Analytical Approaches for Assessing Chicken Species and Breeds in Food Authentication. Molecules 2021; 26:6502. [PMID: 34770913 PMCID: PMC8587031 DOI: 10.3390/molecules26216502] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Revised: 10/04/2021] [Accepted: 10/06/2021] [Indexed: 11/07/2022] Open
Abstract
Chicken is known to be the most common meat type involved in food mislabeling and adulteration. Establishing a method to authenticate chicken content precisely and identifying chicken breeds as declared in processed food is crucial for protecting consumers' rights. Categorizing the authentication method into their respective omics disciplines, such as genomics, transcriptomics, proteomics, lipidomics, metabolomics, and glycomics, and the implementation of bioinformatics or chemometrics in data analysis can assist the researcher in improving the currently available techniques. Designing a vast range of instruments and analytical methods at the molecular level is vital for overcoming the technical drawback in discriminating chicken from other species and even within its breed. This review aims to provide insight and highlight previous and current approaches suitable for countering different circumstances in chicken authentication.
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Affiliation(s)
- Goh Dirong
- Natural Medicines and Products Research Laboratory, Institute of Bioscience, Universiti Putra Malaysia (UPM), Serdang 43400, Selangor, Malaysia;
| | - Sara Nematbakhsh
- Laboratory of Food Safety and Food Integrity, Institute of Tropical Agriculture and Food Security, Universiti Putra Malaysia (UPM), Serdang 43400, Selangor, Malaysia; (S.N.); (J.S.); (N.N.)
| | - Jinap Selamat
- Laboratory of Food Safety and Food Integrity, Institute of Tropical Agriculture and Food Security, Universiti Putra Malaysia (UPM), Serdang 43400, Selangor, Malaysia; (S.N.); (J.S.); (N.N.)
- Department of Food Science, Faculty of Food Science and Technology, Universiti Putra Malaysia (UPM), Serdang 43400, Selangor, Malaysia
| | - Pei Pei Chong
- School of Biosciences, Faculty of Health and Medical Sciences, Taylor’s University, Subang Jaya 47500, Selangor, Malaysia;
| | - Lokman Hakim Idris
- Department of Veterinary Preclinical Sciences, Faculty of Veterinary Medicine, Universiti Putra Malaysia (UPM), Serdang 43400, Selangor, Malaysia;
| | - Noordiana Nordin
- Laboratory of Food Safety and Food Integrity, Institute of Tropical Agriculture and Food Security, Universiti Putra Malaysia (UPM), Serdang 43400, Selangor, Malaysia; (S.N.); (J.S.); (N.N.)
| | - Fatchiyah Fatchiyah
- Department of Biology, Faculty of Mathematic and Natural Science, Brawijaya University, JI. Veteran, Malang 65145, Indonesia;
| | - Ahmad Faizal Abdull Razis
- Natural Medicines and Products Research Laboratory, Institute of Bioscience, Universiti Putra Malaysia (UPM), Serdang 43400, Selangor, Malaysia;
- Laboratory of Food Safety and Food Integrity, Institute of Tropical Agriculture and Food Security, Universiti Putra Malaysia (UPM), Serdang 43400, Selangor, Malaysia; (S.N.); (J.S.); (N.N.)
- Department of Food Science, Faculty of Food Science and Technology, Universiti Putra Malaysia (UPM), Serdang 43400, Selangor, Malaysia
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7
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Islam A, Halder J, Rahman ATMM, Ud-Daula A, Uddin S, Hossain MK, Jahan N, Alim A, Bhuyan AA, Rubaya, Hasan M, Alam J. Meat origin differentiation by polymerase chain reaction-restriction fragment length polymorphism. INTERNATIONAL JOURNAL OF FOOD PROPERTIES 2021. [DOI: 10.1080/10942912.2021.1953068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Ariful Islam
- Animal Biotechnology Division, National Institute of Biotechnology, Dhaka, Bangladesh
- Department of Applied Nutrition & Food Technology, Islamic University, Kushtia, Bangladesh
| | - Joyanta Halder
- Animal Biotechnology Division, National Institute of Biotechnology, Dhaka, Bangladesh
- Department of Biotechnology and Genetic Engineering, Islamic University, Kushtia, Bangladesh
| | - ATM Mijanur Rahman
- Department of Applied Nutrition & Food Technology, Islamic University, Kushtia, Bangladesh
| | - Asad Ud-Daula
- Department of Applied Nutrition & Food Technology, Islamic University, Kushtia, Bangladesh
| | - Salah Uddin
- Animal Biotechnology Division, National Institute of Biotechnology, Dhaka, Bangladesh
- Department of Applied Nutrition & Food Technology, Islamic University, Kushtia, Bangladesh
| | - Mridha Kamal Hossain
- Animal Biotechnology Division, National Institute of Biotechnology, Dhaka, Bangladesh
| | - Nusrat Jahan
- Animal Biotechnology Division, National Institute of Biotechnology, Dhaka, Bangladesh
| | - Abdul Alim
- Animal Biotechnology Division, National Institute of Biotechnology, Dhaka, Bangladesh
| | - Anjuman Ara Bhuyan
- Animal Biotechnology Division, National Institute of Biotechnology, Dhaka, Bangladesh
| | - Rubaya
- Animal Biotechnology Division, National Institute of Biotechnology, Dhaka, Bangladesh
| | - Mahmud Hasan
- Animal Biotechnology Division, National Institute of Biotechnology, Dhaka, Bangladesh
| | - Jahangir Alam
- Animal Biotechnology Division, National Institute of Biotechnology, Dhaka, Bangladesh
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9
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Nhari RR, Hanish I, Mokhtar NK, Hamid M, El Sheikha A. Authentication approach using enzyme-linked immunosorbent assay for detection of porcine substances. QUALITY ASSURANCE AND SAFETY OF CROPS & FOODS 2019. [DOI: 10.3920/qas2018.1415] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- R.M.H. Raja Nhari
- Laboratory of Halal Science Research, Halal Products Research Institute, Putra Infoport, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan, Malaysia
| | - I. Hanish
- Department of Microbiology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan, Malaysia
| | - N.F. Khairil Mokhtar
- Laboratory of Halal Science Research, Halal Products Research Institute, Putra Infoport, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan, Malaysia
| | - M. Hamid
- Department of Microbiology, Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan, Malaysia
| | - A.F. El Sheikha
- Jiangxi Agricultural University, 1101 Zhimin Road, Nanchang 330045, China
- Bioengineering and Technological Research Centre for Edible and Medicinal Fungi, Jiangxi Agricultural University, 1101 Zhimin Road, Nanchang 330045, China
- Jiangxi Key Laboratory for Conservation and Utilization of Fungal Resources, Jiangxi Agricultural University, 1101 Zhimin Road, Nanchang 330045, China
- Department of Biology, McMaster University, 1280 Main St. West, Hamilton, Ontario, L8S 4K1, Canada
- Department of Food Science and Technology, Faculty of Agriculture, Minufiya University, 32511 Shibin El Kom, Minufiya Government, Egypt
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10
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Identification and mutational analysis of continuous, immunodominant epitopes of the major oyster allergen Crag 1. Clin Immunol 2019; 201:20-29. [PMID: 30807831 DOI: 10.1016/j.clim.2019.02.008] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2018] [Revised: 02/15/2019] [Accepted: 02/16/2019] [Indexed: 01/03/2023]
Abstract
Shellfish, including oysters, often cause allergic reactions in children and adults. Oysters are inevitably consumed because of its delicacy and nutritional benefit, leading to frequent occurrence of severe clinical symptoms observed in patients with oyster hypersensitivity. We aimed to identify the immunodominant epitopes of oyster tropomyosin and crucial amino acids for IgE binding, which will help us to further understand the immunochemical characteristics of Cra g 1. The potential epitopes were predicted by immunoinformatics tools and the resultant immunodominant epitopes were identified by inhibition ELISA with pooled sera and individual serum from oyster allergic patients. Surprisingly, homologous substitution of multiple amino acids led to obviously decrease affinity of IgE antibodies, but this manner did not abrogate binding completely. Five major linear epitopes were evenly distributed on the surface of homology-based Cra g 1 model and hydrophilic residues appeared to be the most important for IgE binding. These results not only offer a better understanding of the molecular mechanism of interaction between Cra g 1 and oyster-specific IgE but also have significance in clinical diagnosis and immunotherapy.
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11
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James JK, Pike DH, Khan IJ, Nanda V. Structural and Dynamic Properties of Allergen and Non-Allergen Forms of Tropomyosin. Structure 2018; 26:997-1006.e5. [PMID: 29887498 PMCID: PMC6697176 DOI: 10.1016/j.str.2018.05.002] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2017] [Revised: 03/28/2018] [Accepted: 05/08/2018] [Indexed: 11/26/2022]
Abstract
To what extent do structural and biophysical features of food allergen proteins distinguish them from other proteins in our diet? Invertebrate tropomyosins (Tpms) as a class are considered "pan-allergens," inducing food allergy to shellfish and respiratory allergy to dust mites. Vertebrate Tpms are not known to elicit allergy or cross-reactivity, despite their high structural similarity and sequence identity to invertebrate homologs. We expect allergens are sufficiently stable against gastrointestinal proteases to survive for immune sensitization in the intestines, and that proteolytic stability will correlate with thermodynamic stability. Thermal denaturation of shrimp Tpm shows that it is more stable than non-allergen vertebrate Tpm. Shrimp Tpm is also more resistant to digestion. Molecular dynamics uncover local dynamics that select epitopes and global differences in flexibility between shrimp and pig Tpm that discriminate allergens from non-allergens. Molecular determinants of allergenicity depend not only on sequence but on contributions of protein structure and dynamics.
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Affiliation(s)
- Jose K James
- Center for Advanced Biotechnology and Medicine, Department of Biochemistry and Molecular Biology, Robert Wood Johnson Medical School, Rutgers University, Piscataway, NJ 08854, USA
| | - Douglas H Pike
- Center for Advanced Biotechnology and Medicine, Department of Biochemistry and Molecular Biology, Robert Wood Johnson Medical School, Rutgers University, Piscataway, NJ 08854, USA
| | - I John Khan
- Center for Advanced Biotechnology and Medicine, Department of Biochemistry and Molecular Biology, Robert Wood Johnson Medical School, Rutgers University, Piscataway, NJ 08854, USA
| | - Vikas Nanda
- Center for Advanced Biotechnology and Medicine, Department of Biochemistry and Molecular Biology, Robert Wood Johnson Medical School, Rutgers University, Piscataway, NJ 08854, USA.
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12
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Mazzucchelli G, Holzhauser T, Cirkovic Velickovic T, Diaz‐Perales A, Molina E, Roncada P, Rodrigues P, Verhoeckx K, Hoffmann‐Sommergruber K. Current (Food) Allergenic Risk Assessment: Is It Fit for Novel Foods? Status Quo and Identification of Gaps. Mol Nutr Food Res 2018; 62:1700278. [PMID: 28925060 PMCID: PMC5814866 DOI: 10.1002/mnfr.201700278] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2017] [Revised: 07/28/2017] [Indexed: 01/08/2023]
Abstract
Food allergies are recognized as a global health concern. In order to protect allergic consumers from severe symptoms, allergenic risk assessment for well-known foods and foods containing genetically modified ingredients is installed. However, population is steadily growing and there is a rising need to provide adequate protein-based foods, including novel sources, not yet used for human consumption. In this context safety issues such as a potential increased allergenic risk need to be assessed before marketing novel food sources. Therefore, the established allergenic risk assessment for genetically modified organisms needs to be re-evaluated for its applicability for risk assessment of novel food proteins. Two different scenarios of allergic sensitization have to be assessed. The first scenario is the presence of already known allergenic structures in novel foods. For this, a comparative assessment can be performed and the range of cross-reactivity can be explored, while in the second scenario allergic reactions are observed toward so far novel allergenic structures and no reference material is available. This review summarizes the current analytical methods for allergenic risk assessment, highlighting the strengths and limitations of each method and discussing the gaps in this assessment that need to be addressed in the near future.
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Affiliation(s)
- Gabriel Mazzucchelli
- Laboratory of Mass Spectrometry – MolSysDepartment of ChemistryUniversity of LiegeLiegeBelgium
| | | | - Tanja Cirkovic Velickovic
- Center of Excellence for Molecular Food SciencesUniversity of Belgrade – Faculty of ChemistryBelgradeSerbia
- Ghent University Global CampusYeonsu‐guIncheonSouth Korea
| | | | | | - Paola Roncada
- Istituto Sperimentale Italiano Lazzaro SpallanzaniMilanoItaly
| | - Pedro Rodrigues
- CCMARCenter of Marine ScienceUniversity of AlgarveFaroPortugal
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13
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Allergenicity of vertebrate tropomyosins: Challenging an immunological dogma. Allergol Immunopathol (Madr) 2017; 45:297-304. [PMID: 27789064 DOI: 10.1016/j.aller.2016.08.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2016] [Accepted: 08/01/2016] [Indexed: 11/23/2022]
Abstract
With the exception of tilapia tropomyosin, other anecdotic reports of tropomyosin recognition of vertebrate origin are generally not accompanied by clinical significance and a dogmatic idea is generally accepted about the inexistence of allergenicity of vertebrate tropomyosins, based mainly on sequence similarity evaluations with human tropomyosins. Recently, a specific work-up of a tropomyosin sensitised patient with seafood allergy, demonstrated that the IgE-recognition of tropomyosin from different fish species can be clinically relevant. We hypothesise that some vertebrate tropomyosins could be relevant allergens. The hypothesis is based on the molecular evolution of the proteins and it was tested by in silico methods. Fish, which are primitive vertebrates, could have tropomyosins similar to those of invertebrates. If the hypothesis is confirmed, tropomyosin should be included in different allergy diagnosis tools to improve the medical protocols and management of patients with digestive or cutaneous symptoms after fish intake.
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14
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Kollmann D, Nagl B, Ebner C, Emminger W, Wöhrl S, Kitzmüller C, Vrtala S, Mangold A, Ankersmit HJ, Bohle B. The quantity and quality of α-gal-specific antibodies differ in individuals with and without delayed red meat allergy. Allergy 2017; 72:266-273. [PMID: 27261450 PMCID: PMC5244683 DOI: 10.1111/all.12948] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/31/2016] [Indexed: 11/04/2022]
Abstract
Background IgG to galactose‐α‐1,3‐galactose (α‐gal) are highly abundant natural antibodies (Ab) in humans. α‐Gal‐specific IgE Ab cause a special form of meat allergy characterized by severe systemic reactions 3–7 h after consumption of red meat. We investigated 20 patients who experienced such reactions and characterized their α‐gal‐specific IgE and IgG responses in more detail. Methods α‐Gal‐specific IgE was determined by ImmunoCAP. IgE reactivity to meat extract and bovine gamma globulin (BGG) was assessed by immunoblotting and ELISA, respectively. In some experiments, sera were pre‐incubated with α‐gal or protein G to deplete IgG Ab. α‐Gal‐specific IgG1–4 Ab in individuals with and without meat allergy were assessed by ELISA. Results In immunoblots, BGG was the most frequently recognized meat protein. Binding of IgE and IgG to BGG was confirmed by ELISA and completely abolished after pre‐incubation with α‐gal. Neither the depletion of autologous α‐gal‐specific IgG Ab nor the addition of α‐gal‐specific IgG Ab from nonallergic individuals changed the IgE recognition of BGG of meat‐allergic patients. Meat‐allergic patients showed significantly higher α‐gal‐specific IgG1 and IgG3 Ab than nonallergic individuals, whereas the latter showed significantly higher levels of α‐gal‐specific IgG4 Ab. Conclusion Patients with delayed meat allergy display IgE and IgG Ab that selectively recognize the α‐gal epitope on BGG. Their enhanced α‐gal‐specific IgE levels are accompanied by high levels of α‐gal‐specific IgG1 devoid of IgE‐blocking activity. This subclass distribution is atypical for food allergies and distinct from natural α‐gal IgG responses in nonallergic individuals.
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Affiliation(s)
- D. Kollmann
- Department of Pathophysiology and Allergy Research; Medical University of Vienna; Vienna Austria
| | - B. Nagl
- Department of Pathophysiology and Allergy Research; Medical University of Vienna; Vienna Austria
| | - C. Ebner
- Allergy Clinic Reumannplatz; Vienna Austria
| | | | - S. Wöhrl
- Allergy Clinic Floridsdorf; Vienna Austria
| | - C. Kitzmüller
- Department of Pathophysiology and Allergy Research; Medical University of Vienna; Vienna Austria
| | - S. Vrtala
- Department of Pathophysiology and Allergy Research; Medical University of Vienna; Vienna Austria
| | - A. Mangold
- Department of Internal Medicine; Medical University of Vienna; Vienna Austria
| | - H.-J. Ankersmit
- Department of Thoracic Surgery; Medical University of Vienna; Vienna Austria
| | - B. Bohle
- Department of Pathophysiology and Allergy Research; Medical University of Vienna; Vienna Austria
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15
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Lee SY, Kim MJ, Hong Y, Kim HY. Development of a rapid on-site detection method for pork in processed meat products using real-time loop-mediated isothermal amplification. Food Control 2016. [DOI: 10.1016/j.foodcont.2016.01.041] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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16
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Update on the bird-egg syndrome and genuine poultry meat allergy. ACTA ACUST UNITED AC 2016; 25:68-75. [PMID: 27340614 PMCID: PMC4861744 DOI: 10.1007/s40629-016-0108-2] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2015] [Accepted: 08/22/2015] [Indexed: 11/19/2022]
Abstract
Allergy to poultry meat is rare and affects both children and adults. The prevalence of poultry meat allergy is unknown, but presumably is similar to that of red meat allergy. There is no close relationship between allergy to poultry meat and allergy to red meat. Poultry meat allergy may present as primary (genuine) food allergy or as secondary food allergy resulting from cross-reactivity. Secondary poultry meat allergy may arise in the context of bird-egg-syndrome, which is due to sensitization to serum albumins present in many tissues including muscle tissue and egg yolk (Gal d 5). Primary sensitization to serum albumin may happen via the respiratory tract through exposure to pet birds (mainly in adults) or within the context of egg allergy in early childhood. Due to the heat lability of serum albumins, reactions are often limited to the skin upon contact with raw meat. Symptoms from meat ingestion are rare and mostly mild, whereas systemic reactions are common after ingestion of raw or soft-boiled egg yolk. Primary poultry meat allergy is mainly seen in adolescents and young adults, though hypersensitivity may have started already at (pre)school age. Egg allergy is usually absent. Typical symptoms of primary poultry meat allergy include OAS (±dyspnea), gastrointestinal complaints, urticaria and angioedema. Severe anaphylaxis with cardiovascular symptoms is rare. Chicken and turkey meat are highly cross-reactive and responsible for most reactions, while duck and goose meat causes milder or no symptoms. Soups, sausages, and ham represent relevant allergen sources, too. Patients with poultry meat allergy unexpectedly often suffer from concomitant allergy to fish and possibly shrimp. Serum specific IgE against fish and shrimp is found in respectively 60 and 40 % of sera, suggestive of cross-reactive allergens in these foods. The allergens thus far recognized in genuine poultry meat are LMW proteins of 5–25 kDa. One of them has been identified as α-parvalbumin cross-reactive with homologous mammal α-parvalbumins but not with fish α-parvalbumins. Recently, myosin light chains, including 23 kDa MLC-1 (Gal d 7) and 15 kDa MLC-3, have been recognized as new major allergens in chicken meat. The high similarity of chicken MLCs with those from various fish species (∼65 %) might explain the clinical association of poultry meat allergy with fish allergy.
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17
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Horse-meat allergy mediated by dog-allergy: a case report and review of the literature. ACTA ACUST UNITED AC 2016. [DOI: 10.1007/s40629-016-0109-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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18
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Vogel-Ei-Syndrom und genuine Hühnerfleischallergie. ALLERGO JOURNAL 2016. [DOI: 10.1007/s15007-016-1073-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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19
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Morisset M, Arumugam K, Ollert M, Hilger C. Horse-meat allergy mediated by dog-allergy: a case report and review of the literature. ALLERGO JOURNAL 2016. [DOI: 10.1007/s15007-016-1074-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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20
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21
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Immunostimulation Effects of Yellowtail Heart Extractsin Vitroandin Vivo. Biosci Biotechnol Biochem 2014; 75:638-45. [DOI: 10.1271/bbb.100713] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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22
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Karabasanavar NS, Singh SP, Kumar D, Shebannavar SN. Detection of pork adulteration by highly-specific PCR assay of mitochondrial D-loop. Food Chem 2013; 145:530-4. [PMID: 24128510 DOI: 10.1016/j.foodchem.2013.08.084] [Citation(s) in RCA: 94] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2012] [Revised: 08/08/2013] [Accepted: 08/21/2013] [Indexed: 12/01/2022]
Abstract
We describe a highly specific PCR assay for the authentic identification of pork. Accurate detection of tissues derived from pig (Sus scrofa) was accomplished by using newly designed primers targeting porcine mitochondrial displacement (D-loop) region that yielded an unique amplicon of 712 base pairs (bp). Possibility of cross-amplification was precluded by testing as many as 24 animal species (mammals, birds, rodent and fish). Suitability of PCR assay was confirmed in raw (n = 20), cooked (60, 80 and 100 °C), autoclaved (121 °C) and micro-oven processed pork. Sensitivity of detection of pork in other species meat using unique pig-specific PCR was established to be at 0.1%; limit of detection (LOD) of pig DNA was 10 pg (pico grams). The technique can be used for the authentication of raw, processed and adulterated pork and products under the circumstances of food adulteration related disputes or forensic detection of origin of pig species.
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Affiliation(s)
- Nagappa S Karabasanavar
- Department of Veterinary Public & Epidemiology, Veterinary College, Shimoga 577 204, Karnataka, India.
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23
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Kennedy JL, Stallings AP, Platts-Mills TA, Oliveira WM, Workman L, James HR, Tripathi A, Lane CJ, Matos L, Heymann PW, Commins SP. Galactose-α-1,3-galactose and delayed anaphylaxis, angioedema, and urticaria in children. Pediatrics 2013; 131:e1545-52. [PMID: 23569097 PMCID: PMC3639458 DOI: 10.1542/peds.2012-2585] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
BACKGROUND AND OBJECTIVE Despite a thorough history and comprehensive testing, many children who present with recurrent symptoms consistent with allergic reactions elude diagnosis. Recent research has identified a novel cause for "idiopathic" allergic reactions; immunoglobulin E (IgE) antibody specific for the carbohydrate galactose-α-1,3-galactose (α-Gal) has been associated with delayed urticaria and anaphylaxis that occurs 3 to 6 hours after eating beef, pork, or lamb. We sought to determine whether IgE antibody to α-Gal was present in sera of pediatric patients who reported idiopathic anaphylaxis or urticaria. METHODS Patients aged 4 to 17 were enrolled in an institutional review board-approved protocol at the University of Virginia and private practice allergy offices in Lynchburg, VA. Sera was obtained and analyzed by ImmunoCAP for total IgE and specific IgE to α-Gal, beef, pork, cat epithelium and dander, Fel d 1, dog dander, and milk. RESULTS Forty-five pediatric patients were identified who had both clinical histories supporting delayed anaphylaxis or urticaria to mammalian meat and IgE antibody specific for α-Gal. In addition, most of these cases had a history of tick bites within the past year, which itched and persisted. CONCLUSIONS A novel form of anaphylaxis and urticaria that occurs 3 to 6 hours after eating mammalian meat is not uncommon among children in our area. Identification of these cases may not be straightforward and diagnosis is best confirmed by specific testing, which should certainly be considered for children living in the area where the Lone Star tick is common.
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Affiliation(s)
- Joshua L. Kennedy
- Division of Allergy and Immunology, Department of Internal Medicine and
| | - Amy P. Stallings
- Division of Allergy and Immunology, Department of Internal Medicine and
| | | | | | - Lisa Workman
- Division of Allergy and Immunology, Department of Internal Medicine and
| | - Haley R. James
- Division of Allergy and Immunology, Department of Internal Medicine and
| | - Anubha Tripathi
- Division of Allergy and Immunology, Department of Internal Medicine and
| | | | - Luis Matos
- Asthma and Allergy Center of Lynchburg, Lynchburg, Virginia
| | - Peter W. Heymann
- Pediatrics, University of Virginia Health System, Charlottesville, Virginia
| | - Scott P. Commins
- Division of Allergy and Immunology, Department of Internal Medicine and,Pediatrics, University of Virginia Health System, Charlottesville, Virginia
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24
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Commins SP, Platts-Mills TAE. Delayed anaphylaxis to red meat in patients with IgE specific for galactose alpha-1,3-galactose (alpha-gal). Curr Allergy Asthma Rep 2013; 13:72-7. [PMID: 23054628 PMCID: PMC3545071 DOI: 10.1007/s11882-012-0315-y] [Citation(s) in RCA: 81] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Anaphylaxis is a severe allergic reaction that can be rapidly progressing and fatal. In instances where the triggering allergen is not known, establishing the etiology of anaphylaxis is pivotal to long-term risk management. Our recent work has identified a novel IgE antibody (Ab) response to a mammalian oligosaccharide epitope, galactose-alpha-1,3-galactose (alpha-gal), that has been associated with two distinct forms of anaphylaxis: (1) immediate onset anaphylaxis during first exposure to intravenous cetuximab, and (2) delayed onset anaphylaxis 3-6 h after ingestion of mammalian food products (e.g., beef and pork). The results of our studies strongly suggest that tick bites are a cause, if not the only significant cause, of IgE Ab responses to alpha-gal in the southern, eastern and central United States. Patients with IgE Ab to alpha-gal continue to emerge and, increasingly, these cases involve children. This IgE Ab response cross-reacts with cat and dog but does not appear to pose a risk for asthma; however, it may impair diagnostic testing in some situations.
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Affiliation(s)
- Scott P. Commins
- Department of Internal Medicine & Pediatrics, Division of Allergy and Immunology, University of Virginia Health System, Charlottesville, VA, USA. Division of Allergy, Asthma, and Immunology, University of Virginia Health System, P.O. Box 801355, Charlottesville, VA 22908, USA
| | - Thomas A. E. Platts-Mills
- Department of Internal Medicine, Division of Allergy and Immunology, University of Virginia Health System, Charlottesville, VA, USA. Division of Allergy, Asthma, and Immunology, University of Virginia Health System, P.O. Box 801355, Charlottesville, VA 22908, USA
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25
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Initial description of pork-cat syndrome in the United States. J Allergy Clin Immunol 2013; 131:923-5. [PMID: 23352634 DOI: 10.1016/j.jaci.2012.12.665] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2012] [Revised: 12/06/2012] [Accepted: 12/10/2012] [Indexed: 12/16/2022]
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26
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Karabasanavar NS, Singh SP, Kumar D, Shebannavar SN. Development and application of highly specific PCR for detection of chicken (Gallus gallus) meat adulteration. Eur Food Res Technol 2012. [DOI: 10.1007/s00217-012-1868-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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27
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Authentication of beef, carabeef, chevon, mutton and pork by a PCR-RFLP assay of mitochondrial cytb gene. Journal of Food Science and Technology 2012; 51:3458-63. [PMID: 26396346 DOI: 10.1007/s13197-012-0864-z] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Revised: 09/18/2012] [Accepted: 09/20/2012] [Indexed: 10/27/2022]
Abstract
Authentication of meat assumes significance in view of religious, quality assurance, food safety, public health, conservation and legal concerns. Here, we describe a PCR-RFLP (Polymerase Chain Reaction- Restriction Fragment Length Polymorphism) assay targeting mitochondrial cytochrome-b gene for the identification of meats of five most common food animals namely cattle, buffalo, goat, sheep and pig. A pair of forward and reverse primers (VPH-F & VPH-R) amplifying a conserved region (168-776 bp) of mitochondrial cytochrome-b (cytb) gene for targeted species was designed which yielded a 609 bp PCR amplicon. Further, restriction enzyme digestion of the amplicons with Alu1 and Taq1 restriction enzymes resulted in a distinctive digestion pattern that was able to discriminate each species. The repeatability of the PCR-RFLP assay was validated ten times with consistent results observed. The developed assay can be used in routine diagnostic laboratories to differentiate the meats of closely related domestic livestock species namely cattle from buffalo and sheep from goat.
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28
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Jappe U. [Update on meat allergy. α-Gal: a new epitope, a new entity?]. DER HAUTARZT 2012; 63:299-306. [PMID: 22418768 DOI: 10.1007/s00105-011-2266-y] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
The association between the carbohydrate galactose-[alpha]-1,3-galactose (α-Gal) and anaphylaxis was first documented after severe hypersensitivity reactions to cetuximab, a chimeric mouse-human IgG1 monoclonal antibody approved for targeted therapy of carcinomas of colon, as well as of the head and neck region. α-Gal is a ubiquitous glycan moiety expressed on cells and tissue of non-primate mammals. Since this epitope is not expressed in humans, it is very immunogenic for them. α-Gal is located on the Fab portion of cetuximab and thus on the murine part of the chimera. The anaphylactic reactions to the antibody were mediated by IgE specific for α-Gal. Anti-α-Gal-IgE were first detected in sera of patients from the southeastern U.S. and reacted with a wide range of mammalian allergens. The geographic distribution prompted investigations of sensitization routes apart from the ingestion of red meat, such as tick bites und parasitic infections. Anti-α-Gal-IgE seems to be of clinical relevance for allergy to red meat and for the pork-cat syndrome. It is also associated with a novel form of delayed anaphylaxis, which appears more than 3 hours following the ingestion of red meat (beef, pork and lamb), a phenomenon which is still to be elucidated. For most of these patients conventional skin prick tests with commercial reagents proved insufficient for diagnosis.
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Affiliation(s)
- U Jappe
- Klinik für Dermatologie, Allergologie und Venerologie, Universität Lübeck, Lübeck, Deutschland.
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29
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Abstract
Food allergy is an emerging epidemic in the United States and the Western world. The determination of factors that make certain foods allergenic is still not clearly understood. Only a tiny fraction of thousands of proteins and other molecules is responsible for inducing food allergy. In this review, the authors present 3 examples of food allergies with disparate clinical presentations: peanut, soy, and mammalian meat. The potential relationships between allergen structure and function, emphasizing the importance of cross-reactive determinants, immunoglobulin E antibodies to the oligosaccharides, and the immune responses induced in humans are discussed.
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Affiliation(s)
- Madhan Masilamani
- Division of Allergy and Immunology, Department of Pediatrics, The Jaffe Food Allergy Institute, Mount Sinai School of Medicine, Anbg 17-40, One Gustave L Levy Place, New York, NY 10029, USA
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30
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Cheikh Rouhou S, Bachouch I, Racil H, Chaouch N, Zarrouk M, Salmi L, Chabbou A. [Anaphylaxis due to chicken meat]. Rev Mal Respir 2011; 29:98-100. [PMID: 22240229 DOI: 10.1016/j.rmr.2011.11.009] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2011] [Accepted: 09/21/2011] [Indexed: 11/28/2022]
Abstract
Acute anaphylaxis due to chicken meat is very rare; only a few cases have been reported in the literature. We report the case of a 13-year-old girl, with a past history of allergic urticaria due to eggs, who presented immediately after ingestion of lightly grilled chicken meat with facial edema, dysphonia, acute dyspnoea and a feeling of suffocation. A few months later, the patient developed asthma in the vicinity of poultry and after contact with chicken feathers.
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Affiliation(s)
- S Cheikh Rouhou
- Service de pneumologie, d'allergologie et d'endoscopie, université Tunis-El Manar, hôpital A. Mami, 20920 Ariana, Tunisie.
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31
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Abstract
The popularity of shellfish has been increasing worldwide, with a consequent increase in adverse reactions that can be allergic or toxic. The approximate prevalence of shellfish allergy is estimated at 0.5-2.5% of the general population, depending on degree of consumption by age and geographic regions. The manifestations of shellfish allergy vary widely, but it tends to be more severe than most other food allergens. Tropomyosin is the major allergen and is responsible for cross-reactivity between members of the shellfish family, particularly among the crustacea. Newly described allergens and subtle differences in the structures of tropomyosin between different species of shellfish could account for the discrepancy between in vitro cross-antigenicity and clinical cross-allergenicity. The diagnosis requires a thorough medical history supported by skin testing or measurement of specific IgE level, and confirmed by appropriate oral challenge testing unless the reaction was life-threatening. Management of shellfish allergy is basically strict elimination, which in highly allergic subjects may include avoidance of touching or smelling and the availability of self-administered epinephrine. Specific immunotherapy is not currently available and requires the development of safe and effective protocols.
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32
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Sereda MJ, Hartmann S, Büttner DW, Volkmer R, Hovestädt M, Brattig N, Lucius R. Characterization of the allergen filarial tropomyosin with an invertebrate specific monoclonal antibody. Acta Trop 2010; 116:61-7. [PMID: 20525500 DOI: 10.1016/j.actatropica.2010.05.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2010] [Revised: 05/25/2010] [Accepted: 05/27/2010] [Indexed: 10/19/2022]
Abstract
Tropomyosins of invertebrates are pan-allergens responsible for wide spread allergic reactions against seafood and arthropods. As invertebrate tropomyosins are highly conserved, helminth tropomyosins are likely to show properties similar to these medically important allergens. Studies with a monoclonal antibody, NR1, raised against tropomyosin of the rodent filarial nematode Acanthocheilonema viteae revealed a B cell epitope common to helminths and marine mollusks, which does not occur in vertebrate tropomyosin. This antibody detected tropomyosin of A. viteae, other filariids, nematodes, trematodes and a cestode, and recognized as well tropomyosin of oyster, squid and octopus, but not of arthropods and vertebrates. Immunohistological analyses of A. viteae, Onchocerca volvulus and other nematodes using NR1 showed that tropomyosin is located in the fibrillar part of the body wall muscles and the uterus, and is also conspicuous in muscles of the pharynx, the vagina and other organs of the nematodes. The abundance of a pan-allergen like tropomyosin in parasitic worms and the counterintuitive, but well documented protection against allergic reactivity by some chronic helminth infections is discussed.
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33
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Scientific Opinion on the assessment of allergenicity of GM plants and microorganisms and derived food and feed. EFSA J 2010. [DOI: 10.2903/j.efsa.2010.1700] [Citation(s) in RCA: 243] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
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34
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Kim KBWR, Lee SY, Song EJ, Park JG, Lee JW, Byun MW, Kim KE, Ahn DH. Changes in Allergenicity of Porcine Serum Albumin by Gamma Irradiation. Korean J Food Sci Anim Resour 2010. [DOI: 10.5851/kosfa.2010.30.3.397] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
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35
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Allergenicity study of EGFP-transgenic chicken meat by serological and 2D-DIGE analysis. Food Chem Toxicol 2010; 48:1302-10. [DOI: 10.1016/j.fct.2010.02.028] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2009] [Revised: 02/14/2010] [Accepted: 02/18/2010] [Indexed: 11/20/2022]
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36
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Fiocchi A, Brozek J, Schünemann H, Bahna SL, von Berg A, Beyer K, Bozzola M, Bradsher J, Compalati E, Ebisawa M, Guzman MA, Li H, Heine RG, Keith P, Lack G, Landi M, Martelli A, Rancé F, Sampson H, Stein A, Terracciano L, Vieths S. World Allergy Organization (WAO) Diagnosis and Rationale for Action against Cow's Milk Allergy (DRACMA) Guidelines. World Allergy Organ J 2010; 3:57-161. [PMID: 23268426 PMCID: PMC3488907 DOI: 10.1097/wox.0b013e3181defeb9] [Citation(s) in RCA: 184] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
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37
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Metz-Favre C, Rame JM, Pauli G, de Blay F. La tropomyosine : un pan-allergène. REVUE FRANCAISE D ALLERGOLOGIE 2009. [DOI: 10.1016/j.reval.2009.04.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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39
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Abstract
PURPOSE OF REVIEW This review summarizes the scientific evidence on meat allergy, an unusual disorder, whose prevalence in some European countries (such as Italy) may be increasing. RECENT FINDINGS Data reported in this review underline some interesting points: in meats rarely consumed, such as kangaroo, whale and seal, the main allergens are only partially correlated to those detected in beef or other usually consumed meats; cross-reactivity and cross-contamination are critical aspects, which should be seriously considered by allergologists. SUMMARY Meat allergy is normally outgrown during the first years of life, so that it is rare in adults. Beef among mammals and chicken among birds are most frequently involved. The major allergens are serum albumins and immunoglobulins, but there are a few reports of allergies to muscle proteins (actin, myosin and tropomyosin). As meat allergenicity can be reduced by various treatments (heat, homogenization and freeze-drying), the consumption of meat derivatives by children allergic to meat proteins is often permitted. Cross-reactivity has been described between different meats, between meat and milk or eggs and between meat and animal dander. There are some reports of cross-contamination associated with the inadequate cleaning of industrial or butchers' equipment. All these aspects may have serious implications for clinical practice.
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40
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Albrecht M, Alessandri S, Conti A, Reuter A, Lauer I, Vieths S, Reese G. High level expression, purification and physico- and immunochemical characterisation of recombinant Pen a 1: a major allergen of shrimp. Mol Nutr Food Res 2009; 52 Suppl 2:S186-95. [PMID: 18727010 DOI: 10.1002/mnfr.200700424] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Well-characterised and immunologically active recombinant allergens are of eminent importance for improvement of diagnostic tools and immunotherapy of allergic diseases. The use of recombinant allergens has several advantages such as the more precise quantification of the active substance compared to allergen extracts and the reduced risk of contamination with other allergenic proteins compared to purified natural allergens. Optimised standard protocols for expression and purification and a detailed physico-chemical characterisation of such recombinant allergens are necessary to ensure consistent quality and comparability of results obtained with recombinant material. In this study the major allergen Pen a 1 of brown shrimp (Penaeus aztecus) was expressed in E. coli and purified in two steps by immobilised metal chelate-affinity chromatography (IMAC) and size-exclusion chromatography. Identity and purity were verified with N-terminal sequencing and peptide mass fingerprinting. Circular dichroism and NMR-spectroscopy indicated an alpha-helical flexible structure of rPen a 1 which is in accordance with the known structure of tropomyosins. Finally, the recombinant allergen proved to be immunologically reactive in IgE Western blot analysis and ELISA. This study provides a protocol for the preparation of recombinant shrimp tropomyosin in standardised quality.
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Affiliation(s)
- Melanie Albrecht
- Department of Allergology, Paul-Ehrlich-Institut, Langen, Germany
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41
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Sereda MJ, Hartmann S, Lucius R. Helminths and allergy: the example of tropomyosin. Trends Parasitol 2008; 24:272-8. [PMID: 18450511 DOI: 10.1016/j.pt.2008.03.006] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2007] [Revised: 03/07/2008] [Accepted: 03/10/2008] [Indexed: 12/11/2022]
Abstract
Parasitic worms contain potent allergens, but epidemiological and experimental studies suggest that infections with certain helminths are negatively associated with the prevalence of allergic diseases. This seeming contradiction can be addressed by using filarial tropomyosin as an example. This protein shares structural features and crossreacting B-cell epitopes with other highly allergenic invertebrate tropomyosins. Nevertheless, it usually does not provoke allergic disease in infected individuals. In addition, it is one of the most prominent candidates for an anti-nematode vaccine. Recent data suggest mechanisms that might prevent hosts from developing allergic reactions against allergens of their parasites, such as filarial tropomyosin.
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Affiliation(s)
- Michal J Sereda
- Department of Molecular Parasitology, Institute of Biology, Humboldt University Berlin, Philippstr. 13, Haus 14, Berlin, Germany
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Jenkins JA, Breiteneder H, Mills ENC. Evolutionary distance from human homologs reflects allergenicity of animal food proteins. J Allergy Clin Immunol 2007; 120:1399-405. [PMID: 17935767 DOI: 10.1016/j.jaci.2007.08.019] [Citation(s) in RCA: 139] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2007] [Revised: 08/11/2007] [Accepted: 08/13/2007] [Indexed: 11/17/2022]
Abstract
BACKGROUND In silico analysis of allergens can identify putative relationships among protein sequence, structure, and allergenic properties. Such systematic analysis reveals that most plant food allergens belong to a restricted number of protein superfamilies, with pollen allergens behaving similarly. OBJECTIVE We have investigated the structural relationships of animal food allergens and their evolutionary relatedness to human homologs to define how closely a protein must resemble a human counterpart to lose its allergenic potential. METHODS Profile-based sequence homology methods were used to classify animal food allergens into Pfam families, and in silico analyses of their evolutionary and structural relationships were performed. RESULTS Animal food allergens could be classified into 3 main families--tropomyosins, EF-hand proteins, and caseins--along with 14 minor families each composed of 1 to 3 allergens. The evolutionary relationships of each of these allergen superfamilies showed that in general, proteins with a sequence identity to a human homolog above approximately 62% were rarely allergenic. Single substitutions in otherwise highly conserved regions containing IgE epitopes in EF-hand parvalbumins may modulate allergenicity. CONCLUSION These data support the premise that certain protein structures are more allergenic than others. Contrasting with plant food allergens, animal allergens, such as the highly conserved tropomyosins, challenge the capability of the human immune system to discriminate between foreign and self-proteins. Such immune responses run close to becoming autoimmune responses. CLINICAL IMPLICATIONS Exploiting the closeness between animal allergens and their human homologs in the development of recombinant allergens for immunotherapy will need to consider the potential for developing unanticipated autoimmune responses.
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Nakano S, Yoshinuma T, Yamada T. Reactivity of Shrimp Allergy-Related IgE Antibodies to Krill Tropomyosin. Int Arch Allergy Immunol 2007; 145:175-81. [PMID: 17912005 DOI: 10.1159/000109286] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2007] [Accepted: 06/05/2007] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Krill, which morphologically resembles small shrimp, represents small ocean crustaceans and has been used for human consumption in Japan and some other countries. The major allergen in crustaceans has been reported to be tropomyosin, but the allergenicity of krill tropomyosin remains uncertain. METHODS Amino acid sequences of tropomyosin in two species of krill (Euphausia superba and E. pacifica) were deduced. Recombinant krill tropomyosins were produced in Escherichia coli using a pCold IV vector system, and the cross-reactivity of shrimp allergy-related IgE to the recombinant tropomyosins and several animal protein extracts was assessed by immunoblotting. RESULTS The deduced amino acid sequences of the E. superba and E. pacifica tropomyosins (designated as Eup s 1 and Eup p 1, respectively) were 284 residues and showed significant homology to those of shrimp, lobster and crab tropomyosins. Shrimp allergy-related IgE reacted to approximately 38-kDa protein bands in krill (E. superba), shrimp, lobster and crab protein extracts but did not react to protein extracts from either mollusks or vertebrates. Furthermore, the IgE recognized rEup s 1 and rEup p 1 as 38-kDa protein bands, and absorption of the IgE with rEup s 1 removed IgE reactivity to recombinant tropomyosins and protein extracts from krill and shrimp. CONCLUSIONS Krill tropomyosins included highly homologous sequences to previously reported IgE-binding epitopes in Pen a 1 (tropomyosin of Penaeus aztecus). The cross-reactivity in shrimp allergy-related IgE binding among krill, shrimp, lobster and crab tropomyosins was revealed. These observations suggest the potential allergenicity of krill tropomyosin.
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Affiliation(s)
- Shigeru Nakano
- Food Safety Research Institute, Nissin Food Products, Kusatsu, Shiga, Japan.
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Mikita CP, Padlan EA. Why is there a greater incidence of allergy to the tropomyosin of certain animals than to that of others? Med Hypotheses 2007; 69:1070-3. [PMID: 17482765 DOI: 10.1016/j.mehy.2006.12.060] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2006] [Accepted: 12/21/2006] [Indexed: 10/23/2022]
Abstract
Tropomyosin is a major allergen in various foods, implicated in a spectrum of mild to life threatening systemic reactions. The incidence of allergy to tropomyosin varies greatly by species, with sensitivity to crab, shrimp, cockroach, and dust mite tropomyosins, among others, being the highest, while tropomyosins in vertebrate species are considered non-allergenic. We have analyzed the possible fragments which may result from Pepsin A digestion of tropomyosins from various species and find that larger fragments of the tropomyosins from crab, shrimp, cockroach, and especially, dust mites will probably survive gastric digestion, compared to those from, for example, chicken, cattle, rabbit, or fish. These larger peptide fragments may enter the bloodstream and assume a three-dimensional structure whose stability approaches that of the intact molecule. Antibodies, including IgE, would be expected to be produced specifically against stable regions of the tertiary structure. We propose that this is a plausible explanation for the greater ability of the larger molecules derived from invertebrate tropomyosins to trigger an immediate hypersensitivity response.
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Affiliation(s)
- Cecilia P Mikita
- Department of Allergy and Immunology, Walter Reed Army Medical Center, Washington, DC, USA
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Reese G, Schicktanz S, Lauer I, Randow S, Lüttkopf D, Vogel L, Lehrer SB, Vieths S. Structural, immunological and functional properties of natural recombinant Pen a 1, the major allergen of Brown Shrimp, Penaeus aztecus. Clin Exp Allergy 2006; 36:517-24. [PMID: 16630158 DOI: 10.1111/j.1365-2222.2006.02454.x] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND Recombinant allergens are considered the basis for new diagnostic approaches and development of novel strategies of allergen-specific immunotherapy. As Pen a 1 from brown shrimp Penaeus aztecus is the only major allergen of shrimp and binds up to 75% of all shrimp-specific IgE antibodies this molecule may be an excellent model for the usage of allergens with reduced IgE antibody-binding capacity for specific immunotherapy. AIM The aim was to clone, express and characterize a full-length recombinant Pen a 1 molecule and compare it with natural Pen a 1 in regard to structural and immunological parameters such as IgE antibody capacity and ability to induce IgE-mediated mediator release. METHODS Total RNA was isolated from P. aztecus and a rapid amplification of cDNA ends (5' RACE) was performed to obtain full-length cDNA coding for Pen a 1. Using a gene-specific primer, PCR was performed and full-length cDNA was cloned and sequenced. Recombinant His-tagged Pen a 1 was isolated from Escherichia coli under native conditions by immobilized metal affinity chromatography. Secondary structure of natural and recombinant Pen a 1 was compared by circular dichroism (CD) spectroscopy, and the IgE antibody-binding capacity evaluated by RAST. The allergenic potency was tested by the capability of natural and recombinant Pen a 1 to induce mediator release in a murine and human in vitro model of IgE-mediated type I allergy. RESULTS The deduced amino-acid sequence was 284 residues long and amino-acid sequence identities with allergenic and non-allergenic tropomyosins ranged from 80% to 99% and 51% to 58%, respectively. The analysis of the secondary structure of natural and recombinant Pen a 1 by CD spectroscopic analysis showed that both nPen a 1 and rPen a 1 had alpha-helical conformation that is typical for tropomyosin. The IgE antibody binding capacities of nPen a 1 and r Pen a1 were found to be essentially identical by RAST. The mediator release experiments using both wild-type and humanized rat basophilic leukaemia 30/25 cells showed that rPen a 1 and nPen a 1 induced a similar level of mast cell activation. CONCLUSIONS Recombinant Pen a 1 and natural Pen a 1 are structurally and immunologically identical and rPen a 1 may be used as the basis for component-resolved diagnosis and the generation of modified shrimp tropomyosin for allergen-specific immunotherapy. The results of the animal studies indicate that C3H/HeJ mice that were sensitized with shrimp extract in combination with cholera toxin as adjuvant may be a suitable model to study shrimp allergy.
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Affiliation(s)
- G Reese
- Paul-Ehrlich-Institut, Department of Allergology, Langen, Germany.
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Fiocchi A, Assa'ad A, Bahna S. Food allergy and the introduction of solid foods to infants: a consensus document. Adverse Reactions to Foods Committee, American College of Allergy, Asthma and Immunology. Ann Allergy Asthma Immunol 2006; 97:10-20; quiz 21, 77. [PMID: 16892776 DOI: 10.1016/s1081-1206(10)61364-6] [Citation(s) in RCA: 104] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
OBJECTIVE To make recommendations based on a critical review of the evidence for the timing of the introduction of solid foods and its possible role in the development of food allergy. DATA SOURCES MEDLINE searches using the following search algorithm: [weaning AND infant AND allergy]/[food allergy AND sensitization]/[dietary prevention AND food allergy OR allergens]/[Jan 1980-Feb 2006]. STUDY SELECTION Using the authors' clinical experience and research expertise, 52 studies were retrieved that satisfied the following conditions: English language, journal impact factor above 1 or scientific society, expert, or institutional publication, and appraisable using the World Health Organization categories of evidence. RESULTS Available information suggests that early introduction can increase the risk of food allergy, that avoidance of solids can prevent the development of specific food allergies, that some foods are more allergenic than others, and that some food allergies are more persistent than others. CONCLUSIONS Pediatricians and allergists should cautiously individualize the introduction of solids into the infants' diet. With assessed risk of allergy, the optimal age for the introduction of selected supplemental foods should be 6 months, dairy products 12 months, hen's egg 24 months, and peanut, tree nuts, fish, and seafood at least 36 months. For all infants, complementary feeding can be introduced from the sixth month, and egg, peanut, tree nuts, fish, and seafood introduction require caution. Foods should be introduced one at a time in small amounts. Mixed foods containing various food allergens should not be given unless tolerance to every ingredient has been assessed.
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Affiliation(s)
- Alessandro Fiocchi
- American College of Allergy, Asthma and Immunology, Melloni Paediatria, University of Milan Medical School, Melloni Hospital, Milan, Italy.
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Reese G, Viebranz J, Leong-Kee SM, Plante M, Lauer I, Randow S, Moncin MSM, Ayuso R, Lehrer SB, Vieths S. Reduced Allergenic Potency of VR9-1, a Mutant of the Major Shrimp Allergen Pen a 1 (Tropomyosin). THE JOURNAL OF IMMUNOLOGY 2005; 175:8354-64. [PMID: 16339577 DOI: 10.4049/jimmunol.175.12.8354] [Citation(s) in RCA: 90] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The major shrimp allergen, tropomyosin, is an excellent model allergen for studying the influence of mutations within the primary structure on the allergenic potency of an allergen; Pen a 1 allows systematic evaluation and comparison of Ab-binding epitopes, because amino acid sequences of both allergenic and nonallergenic tropomyosins are known. Individually recognized IgE Ab-binding epitopes, amino acid positions, and substitutions critical for IgE Ab binding were identified by combinatorial substitution analysis, and 12 positions deemed critical were mutated in the eight major epitopes. The mutant VR9-1 was characterized with regard to allergenic potency by mediator release assays using sera from shrimp-allergic subjects and sera from BALB/c, C57BL/6J, C3H/HeJ, and CBA/J mice sensitized with shrimp extract using alum, cholera toxin, and Bordetella pertussis, as adjuvants. The secondary structure of VR9-1 was not altered; however, the allergenic potency was reduced by 90-98% measuring allergen-specific mediator release from humanized rat basophilic leukemia (RBL) cells, RBL 30/25. Reduced mediator release of RBL-2H3 cells sensitized with sera from mice that were immunized with shrimp extract indicated that mice produced IgE Abs to Pen a 1 and to the same epitopes as humans did. In conclusion, data obtained by mapping sequential epitopes were used to generate a Pen a 1 mutant with significantly reduced allergenic potency. Epitopes that are relevant for human IgE Ab binding are also major binding sites for murine IgE Abs. These results indicate that the murine model might be used to optimize the Pen a 1 mutant for future therapeutic use.
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Affiliation(s)
- Gerald Reese
- Division of Allergology, Paul Ehrlich Institut, Langen, Germany.
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Chu KH, Tang CY, Wu A, Leung PSC. Seafood allergy: lessons from clinical symptoms, immunological mechanisms and molecular biology. ADVANCES IN BIOCHEMICAL ENGINEERING/BIOTECHNOLOGY 2005; 97:205-35. [PMID: 16261809 DOI: 10.1007/b135827] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/08/2022]
Abstract
Food allergy consists of a wide range of disorders that result from adverse immune responses to dietary antigens. Manifestations of allergic response includes acute, potentially fatal anaphylactic reactions and a variety of chronic diseases that mainly affect the gastrointestinal tract, skin, and respiratory tract. Tools for clinical diagnosis and management, which have not changed much in the past two decades, include the clinical history, tests for specific IgE antibody to suspected foods, elimination diets, oral food challenges, and provision of medications such as epinephrine for emergency treatment. On the other hand, recent immunological and molecular biological research have enhanced our understanding of the mechanisms of these disorders and revealed the identities of many food allergens. Here, we will discuss seafood allergies with respect to the clinical manifestations, diagnosis, immunological mechanisms, and molecular biology of seafood allergens. Furthermore, potential applications and future directions in the clinical management of seafood allergies are discussed.
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Affiliation(s)
- Ka Hou Chu
- Department of Biology, The Chinese University of Hong Kong, Hong Kong, China
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Jeong KY, Lee J, Lee IY, Ree HI, Hong CS, Yong TS. Analysis of amino acid sequence variations and immunoglobulin E-binding epitopes of German cockroach tropomyosin. CLINICAL AND DIAGNOSTIC LABORATORY IMMUNOLOGY 2005; 11:874-8. [PMID: 15358646 PMCID: PMC515276 DOI: 10.1128/cdli.11.5.874-878.2004] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The allergenicities of tropomyosins from different organisms have been reported to vary. The cDNA encoding German cockroach tropomyosin (Bla g 7) was isolated, expressed, and characterized previously. In the present study, the amino acid sequence variations in German cockroach tropomyosin were analyzed in order to investigate its influence on allergenicity. We also undertook the identification of immunodominant peptides containing immunoglobulin E (IgE) epitopes which may facilitate the development of diagnostic and immunotherapeutic strategies based on the recombinant proteins. Two-dimensional gel electrophoresis and immunoblot analysis with mouse anti-recombinant German cockroach tropomyosin serum was performed to investigate the isoforms at the protein level. Reverse transcriptase PCR (RT-PCR) was applied to examine the sequence diversity. Eleven different variants of the deduced amino acid sequences were identified by RT-PCR. German cockroach tropomyosin has only minor sequence variations that did not seem to affect its allergenicity significantly. These results support the molecular basis underlying the cross-reactivities of arthropod tropomyosins. Recombinant fragments were also generated by PCR, and IgE-binding epitopes were assessed by enzyme-linked immunosorbent assay. Sera from seven patients revealed heterogeneous IgE-binding responses. This study demonstrates multiple IgE-binding epitope regions in a single molecule, suggesting that full-length tropomyosin should be used for the development of diagnostic and therapeutic reagents.
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Affiliation(s)
- Kyoung Yong Jeong
- Department of Parasitology and Institute of Tropical Medicine, Brain Korea 21 Project for Medical Science, Yonsei University College of Medicine, Seoul, Korea
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Affiliation(s)
- H C Bourne
- Regional Department of Immunology and Allergy, Royal Victoria Infirmary, Newcastle-Upon-Tyne, UK.
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