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Foo ACY, Nesbit JB, Gipson SAY, DeRose EF, Cheng H, Hurlburt BK, Kulis MD, Kim EH, Dreskin SC, Mustafa S, Maleki SJ, Mueller GA. Structure and IgE Cross-Reactivity among Cashew, Pistachio, Walnut, and Peanut Vicilin-Buried Peptides. J Agric Food Chem 2023; 71:2990-2998. [PMID: 36728846 PMCID: PMC10402694 DOI: 10.1021/acs.jafc.2c07061] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Peanut and tree-nut allergies are frequently comorbid for reasons not completely understood. Vicilin-buried peptides (VBPs) are an emerging family of food allergens whose conserved structural fold could mediate peanut/tree-nut co-allergy. Peptide microarrays were used to identify immunoglobulin E (IgE) epitopes from the N-terminus of the vicilin allergens Ara h 1, Ana o 1, Jug r 2, and Pis v 3 using serum from three patient diagnosis groups: monoallergic to either peanuts or cashew/pistachio, or dual allergic. IgE binding peptides were highly prevalent in the VBP domains AH1.1, AO1.1, JR2.1, and PV3.1, but not in AO1.2, JR2.2, JR2.3, and PV3.2 nor the unstructured regions. The IgE profiles did not correlate with diagnosis group. The structure of the VBPs from cashew and pistachio was solved using solution-NMR. Comparisons of structural features suggest that the VBP scaffold from peanuts and tree-nuts can support cross-reactivity. This may help understand comorbidity and cross-reactivity despite a distant evolutionary origin.
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Affiliation(s)
- Alexander C Y Foo
- Genome Integrity and Structural Biology Laboratory, National Institute of Environmental Health Sciences, 111 T.W. Alexander Drive, MD-MR01, Durham, North Carolina 27709, United States
| | - Jacqueline B Nesbit
- Agricultural Research Service, United States Department of Agriculture, 1100 Allen Toussaint Boulevard, New Orleans, Louisiana 70124, United States
| | - Stephen A Y Gipson
- Agricultural Research Service, United States Department of Agriculture, 1100 Allen Toussaint Boulevard, New Orleans, Louisiana 70124, United States
| | - Eugene F DeRose
- Genome Integrity and Structural Biology Laboratory, National Institute of Environmental Health Sciences, 111 T.W. Alexander Drive, MD-MR01, Durham, North Carolina 27709, United States
| | - Hsiaopo Cheng
- Agricultural Research Service, United States Department of Agriculture, 1100 Allen Toussaint Boulevard, New Orleans, Louisiana 70124, United States
| | - Barry K Hurlburt
- Agricultural Research Service, United States Department of Agriculture, 1100 Allen Toussaint Boulevard, New Orleans, Louisiana 70124, United States
| | - Michael D Kulis
- Department of Pediatrics, University of North Carolina School of Medicine, Chapel Hill, North Carolina 27599-7220, United States
| | - Edwin H Kim
- Department of Pediatrics, University of North Carolina School of Medicine, Chapel Hill, North Carolina 27599-7220, United States
| | - Stephen C Dreskin
- Division of Allergy and Clinical Immunology, University of Colorado Denver School of Medicine, Aurora, Colorado 80045-2560, United States
| | - Shahzad Mustafa
- Rochester Regional Health, University of Rochester School of Medicine and Dentistry, Rochester, New York 14642, United States
| | - Soheila J Maleki
- Agricultural Research Service, United States Department of Agriculture, 1100 Allen Toussaint Boulevard, New Orleans, Louisiana 70124, United States
| | - Geoffrey A Mueller
- Genome Integrity and Structural Biology Laboratory, National Institute of Environmental Health Sciences, 111 T.W. Alexander Drive, MD-MR01, Durham, North Carolina 27709, United States
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Kronfel CM, Cheng H, McBride JK, Nesbit JB, Krouse R, Burns P, Cabanillas B, Crespo JF, Ryan R, Simon RJ, Maleki SJ, Hurlburt BK. IgE epitopes of Ara h 9, Jug r 3, and Pru p 3 in peanut-allergic individuals from Spain and the US. Front Allergy 2023; 3:1090114. [PMID: 36698378 PMCID: PMC9869384 DOI: 10.3389/falgy.2022.1090114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Accepted: 12/16/2022] [Indexed: 01/11/2023] Open
Abstract
Non-specific lipid transfer proteins (LTPs) are well studied allergens that can lead to severe reactions, but often cause oral allergy syndrome in the Mediterranean area and other European countries. However, studies focused on LTP reactivity in allergic individuals from the United States are lacking because they are not considered major allergens. The goal of this study is to determine if differences in immunoglobulin (Ig) E binding patterns to the peanut allergen Ara h 9 and two homologous LTPs (walnut Jug r 3 and peach Pru p 3) between the US and Spain contribute to differences observed in allergic reactivity. Synthetic overlapping 15-amino acid-long peptides offset by five amino acids from Ara h 9, Jug r 3, and Pru p 3 were synthesized, and the intact proteins were attached to microarray slides. Sera from 55 peanut-allergic individuals from the US were tested for IgE binding to the linear peptides and IgE binding to intact proteins using immunofluorescence. For comparison, sera from 17 peanut-allergic individuals from Spain were also tested. Similar IgE binding profiles for Ara h 9, Jug r 3, and Pru p 3 were identified between the US and Spain, with slight differences. Certain regions of the proteins, specifically helices 1 and 2 and the C-terminal coil, were recognized by the majority of the sera more often than other regions of the proteins. While serum IgE from peanut-allergic individuals in the US binds to peptides of Ara h 9 and its homologs, only IgE from the Spanish subjects bound to the intact LTPs. This study identifies Ara h 9, Jug r 3, and Pru p 3 linear epitopes that were previously unidentified using sera from peanut-allergic individuals from the US and Spain. Certain regions of the LTPs are recognized more often in US subjects, indicating that they represent conserved and possible cross-reactive regions. The location of the epitopes in 3D structure models of the LTPs may predict the location of potential conformational epitopes bound by a majority of the Spanish patient sera. These findings are potentially important for development of peptide or protein-targeting diagnostic and therapeutic tools for food allergy.
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Affiliation(s)
- Christina M. Kronfel
- United States Department of Agriculture, Agriculture Research Service, Southern Regional Research Center, New Orleans, LA, United States
| | - Hsiaopo Cheng
- United States Department of Agriculture, Agriculture Research Service, Southern Regional Research Center, New Orleans, LA, United States
| | - Jane K. McBride
- United States Department of Agriculture, Agriculture Research Service, Southern Regional Research Center, New Orleans, LA, United States
| | - Jacqueline B. Nesbit
- United States Department of Agriculture, Agriculture Research Service, Southern Regional Research Center, New Orleans, LA, United States
| | | | - Preston Burns
- Rho Federal Systems Division, Durham, NC, United States
| | - Beatriz Cabanillas
- Department of Allergy, Research Institute Hospital 12 de Octubre, Madrid, Spain
| | - Jesus F. Crespo
- Department of Allergy, Research Institute Hospital 12 de Octubre, Madrid, Spain
| | - Robert Ryan
- Aimmune Therapeutics, a Nestlé Health Science Company, Brisbane, CA, United States
| | - Reyna J. Simon
- Aimmune Therapeutics, a Nestlé Health Science Company, Brisbane, CA, United States
| | - Soheila J. Maleki
- United States Department of Agriculture, Agriculture Research Service, Southern Regional Research Center, New Orleans, LA, United States,Correspondence: Soheila J. Maleki
| | - Barry K. Hurlburt
- United States Department of Agriculture, Agriculture Research Service, Southern Regional Research Center, New Orleans, LA, United States
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Leonard SA, Ogawa Y, Jedrzejewski PT, Maleki SJ, Chapman MD, Tilles SA, Du Toit G, Mustafa SS, Vickery BP. Manufacturing processes of peanut ( Arachis hypogaea) allergen powder-dnfp. Front Allergy 2022; 3:1004056. [PMID: 36304076 PMCID: PMC9592818 DOI: 10.3389/falgy.2022.1004056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Accepted: 09/20/2022] [Indexed: 11/07/2022] Open
Abstract
Background Important components of drug safety, efficacy, and acceptability involve manufacturing and testing of the drug substance and drug product. Peanut flour sourcing/processing and manufacturing processes may affect final drug product allergen potency and contamination level, possibly impacting drug safety, quality, and efficacy. We describe key steps in the manufacturing processes of peanut (Arachis hypogaea) allergen powder-dnfp (PTAH; Palforzia®), a drug used in oral immunotherapy (OIT) for the treatment of peanut allergy. Methods Established criteria for source material must be met for manufacturing PTAH drug product. Degree of roasting was determined with a Hunter colorimeter. Protein/allergen content, identity, potency, safety, and quality of each batch of PTAH drug substance were assessed with a combustion analyzer, allergen-specific Western blot (immunoblotting), ELISA, and HPLC. Contaminants (ie, aflatoxin) were measured by UPLC. Results Roasting degree beyond "light roast" was associated with variable degrees of protein allergen degradation, or potentially aggregation. Relative potency and amounts of protein allergens showed variability due in part to seasonal/manufacturing variability. Proportion of lots not meeting aflatoxin limits has increased in recent years. Up to 60% of peanut flour source material failed to meet screening selection acceptance criteria for proceeding to drug substance testing, mostly because of failure to meet potency acceptance criteria. Other lots were rejected due to safety (ie, aflatoxin) and quality. Influence of potency variation, within specification parameters, on safety/tolerability observed in trials was considered low, in part due to stringent controls placed at each step of manufacturing. Conclusions Extensive variability in allergen potency is a critical issue during immunotherapy, particularly during OIT initial dose escalation and up-dosing, as it may result in lack of efficacy or avoidable adverse allergic reactions. Based on EU and US regulatory requirements, the production of PTAH includes manufacturing controls to ensure drug product safety, potency, and quality. For example, although PTAH contains all peanut allergens, each lot has met strict criteria ensuring consistent allergenic potency of Ara h 1, Ara h 2, and Ara h 6. The rigor of PTAH's manufacturing process ensures reliable dose consistency and stability throughout its shelf life.
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Affiliation(s)
- Stephanie A. Leonard
- Division of Pediatric Allergy / Immunology, University of California San Diego, Rady Children's Hospital, San Diego, CA, United States
| | - Yasushi Ogawa
- Medical Affairs, Aimmune Therapeutics, a Nestlé Health Science company, Brisbane, CA, United States
| | - Paul T. Jedrzejewski
- Medical Affairs, Aimmune Therapeutics, a Nestlé Health Science company, Brisbane, CA, United States
| | - Soheila J. Maleki
- United States Department of Agriculture, Agricultural Research Service, New Orleans, LA, United States
| | | | - Stephen A. Tilles
- Medical Affairs, Aimmune Therapeutics, a Nestlé Health Science company, Brisbane, CA, United States,Correspondence: Stephen A. Tilles
| | - George Du Toit
- Department of Pediatrics, Guy's and St Thomas’ NHS Foundation Trust, London, United Kingdom
| | - S. Shahzad Mustafa
- Rochester Regional Health, University of Rochester School of Medicine and Dentistry, Rochester, NY, United States
| | - Brian P. Vickery
- Department of Pediatrics, Emory University School of Medicine, Atlanta, GA, United States
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Faisal S, Zhang J, Meng S, Shi A, Li L, Wang Q, Maleki SJ, Adhikari B. Effect of high-moisture extrusion and addition of transglutaminase on major peanut allergens content extracted by three step sequential method. Food Chem 2022; 385:132569. [PMID: 35338998 DOI: 10.1016/j.foodchem.2022.132569] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Revised: 01/30/2022] [Accepted: 02/24/2022] [Indexed: 02/04/2023]
Abstract
The effect of high-moisture extrusion (HME) with or without transglutaminase (TGase) on peanut allergen levels and their extractability was studied. A three-stage sequential protein extraction significantly improved the protein recovery in processed samples (extrudate meat analogue); from 5.56 to 18.75 mg/100 mg without TGase, and from 4.59 to 20.82 mg/100 mg with 0.3% TGase. The total major allergen content was reduced by 91% (Ara h 1), 61% (Ara h 2), 60% (Ara h 6), and 55% (Ara h 3). Western-blot analysis of soluble extracts reflected the presence of Ara h 1 and Ara h 2 in significantly lower, indicating a potential reduction in IgE binding. During different processing zones, the most significant reduction in allergenic proteins was in the melting zone. The significant alteration in secondary and tertiary structures as a result of crosslinking shearing and degradation of proteins is likely to lead to allergen reduction.
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Affiliation(s)
- Shah Faisal
- Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences/Key Research Laboratory of Agro-Products Processing, Ministry of Agriculture, Beijing 100193, PR China
| | - Jinchuang Zhang
- Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences/Key Research Laboratory of Agro-Products Processing, Ministry of Agriculture, Beijing 100193, PR China
| | - Shi Meng
- Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences/Key Research Laboratory of Agro-Products Processing, Ministry of Agriculture, Beijing 100193, PR China; Nestle R&D, Building 5, Courtyard 6, Jiuxianqiao Rd, Chaoyang district, Beijing 100015, PR China
| | - Aimin Shi
- Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences/Key Research Laboratory of Agro-Products Processing, Ministry of Agriculture, Beijing 100193, PR China; Collaborative Innovation Center for Modern Grain Circulation and Safety, College of Food Science and Engineering, Nanjing University of Finance and Economics, Nanjing 210023, PR China
| | - Liu Li
- Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences/Key Research Laboratory of Agro-Products Processing, Ministry of Agriculture, Beijing 100193, PR China
| | - Qiang Wang
- Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences/Key Research Laboratory of Agro-Products Processing, Ministry of Agriculture, Beijing 100193, PR China; Collaborative Innovation Center for Modern Grain Circulation and Safety, College of Food Science and Engineering, Nanjing University of Finance and Economics, Nanjing 210023, PR China.
| | - Soheila J Maleki
- United States Department of Agriculture, Agricultural Research Service, Southern Regional Research Center, 1100 Robert E. Lee Blvd., New Orleans, LA 70124, USA, USA
| | - Benu Adhikari
- School of Science, RMIT University, Melbourne, VIC 3083, Australia
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5
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Foo AC, Nesbit JB, Gipson SA, Cheng H, Bushel P, DeRose EF, Schein CH, Teuber SS, Hurlburt BK, Maleki SJ, Mueller GA. Structure, Immunogenicity, and IgE Cross-Reactivity among Walnut and Peanut Vicilin-Buried Peptides. J Agric Food Chem 2022; 70:2389-2400. [PMID: 35139305 PMCID: PMC8959100 DOI: 10.1021/acs.jafc.1c07225] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Vicilin-buried peptides (VBPs) from edible plants are derived from the N-terminal leader sequences (LSs) of seed storage proteins. VBPs are defined by a common α-hairpin fold mediated by conserved CxxxCx(10-14)CxxxC motifs. Here, peanut and walnut VBPs were characterized as potential mediators of both peanut/walnut allergenicity and cross-reactivity despite their low (∼17%) sequence identity. The structures of one peanut (AH1.1) and 3 walnut (JR2.1, JR2.2, JR2.3) VBPs were solved using solution NMR, revealing similar α-hairpin structures stabilized by disulfide bonds with high levels of surface similarity. Peptide microarrays identified several peptide sequences primarily on AH1.1 and JR2.1, which were recognized by peanut-, walnut-, and dual-allergic patient IgE, establishing these peanut and walnut VBPs as potential mediators of allergenicity and cross-reactivity. JR2.2 and JR2.3 displayed extreme resilience against endosomal digestion, potentially hindering epitope generation and likely contributing to their reduced allergic potential.
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Affiliation(s)
- Alexander C.Y. Foo
- National Institute of Environmental Health Sciences, 111 T.W. Alexander Dr, MD-MR01, Research Triangle Park, NC 27615
| | - Jacqueline B. Nesbit
- US Department of Agriculture -Agricultural Research Service, 1100 Robert E. Lee Blvd, New Orleans, LA 70122
| | - Stephen A.Y. Gipson
- US Department of Agriculture -Agricultural Research Service, 1100 Robert E. Lee Blvd, New Orleans, LA 70122
| | - Hsiaopo Cheng
- US Department of Agriculture -Agricultural Research Service, 1100 Robert E. Lee Blvd, New Orleans, LA 70122
| | - Pierre Bushel
- National Institute of Environmental Health Sciences, 111 T.W. Alexander Dr, MD-MR01, Research Triangle Park, NC 27615
| | - Eugene F. DeRose
- National Institute of Environmental Health Sciences, 111 T.W. Alexander Dr, MD-MR01, Research Triangle Park, NC 27615
| | - Catherine H. Schein
- Department of Biochemistry and Molecular Biology, Institute for Human Infections and Immunity, University of Texas Medical Branch, 301 University Blvd., Galveston, TX 77555
| | - Suzanne S. Teuber
- University of California Davis School of Medicine, 2315 Stockton Blvd, Sacramento, CA 95817
| | - Barry K. Hurlburt
- US Department of Agriculture -Agricultural Research Service, 1100 Robert E. Lee Blvd, New Orleans, LA 70122
| | - Soheila J. Maleki
- US Department of Agriculture -Agricultural Research Service, 1100 Robert E. Lee Blvd, New Orleans, LA 70122
| | - Geoffrey A. Mueller
- National Institute of Environmental Health Sciences, 111 T.W. Alexander Dr, MD-MR01, Research Triangle Park, NC 27615
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Maleki SJ, Teuber SS, Mustafa SS. Adult peanut allergy: What we know and what we need to learn. J Allergy Clin Immunol 2021; 147:2069-2072. [PMID: 33831418 DOI: 10.1016/j.jaci.2021.03.031] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2021] [Accepted: 03/19/2021] [Indexed: 11/25/2022]
Affiliation(s)
- Soheila J Maleki
- United States Department of Agriculture, Agricultural Research Service, New Orleans, La.
| | - Suzanne S Teuber
- UC Davis School of Medicine, Division of Rheumatology, Allergy & Clinical Immunology, Davis, Calif
| | - S Shahzad Mustafa
- Rochester Regional Health, University of Rochester School of Medicine and Dentistry, Rochester, NY
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Ruiter B, Smith NP, Fleming E, Patil SU, Hurlburt BK, Maleki SJ, Shreffler WG. Peanut protein acts as a T H2 adjuvant by inducing RALDH2 in human antigen-presenting cells. J Allergy Clin Immunol 2020; 148:182-194.e4. [PMID: 33378690 DOI: 10.1016/j.jaci.2020.11.047] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Revised: 10/26/2020] [Accepted: 11/26/2020] [Indexed: 12/20/2022]
Abstract
BACKGROUND Peanut is a potent inducer of proallergenic TH2 responses in susceptible individuals. Antigen-presenting cells (APCs) including dendritic cells and monocytes instruct naive T cells to differentiate into various effector cells, determining immune responses such as allergy and tolerance. OBJECTIVE We sought to detect peanut protein (PN)-induced changes in gene expression in human myeloid dendritic cells (mDCs) and monocytes, identify signaling receptors that mediate these changes, and assess how PN-induced genes in mDCs impact their ability to promote T-cell differentiation. METHODS mDCs, monocytes, and naive CD4+ T cells were isolated from blood bank donors and peanut-allergic patients. APCs were incubated with PN and other stimulants, and gene expression was measured using microarray and RT quantitative PCR. To assess T-cell differentiation, mDCs were cocultured with naive TH cells. RESULTS PN induced a unique gene expression profile in mDCs, including the gene that encodes retinaldehyde dehydrogenase 2 (RALDH2), a rate-limiting enzyme in the retinoic acid (RA)-producing pathway. Stimulation of mDCs with PN also induced a 7-fold increase in the enzymatic activity of RALDH2. Blocking antibodies against Toll-like receptor (TLR)1/TLR2, as well as small interfering RNA targeting TLR1/TLR2, reduced the expression of RALDH2 in PN-stimulated APCs by 70%. Naive TH cells cocultured with PN-stimulated mDCs showed an RA-dependent 4-fold increase in production of IL-5 and expression of integrin α4β7. CONCLUSIONS PN induces RALDH2 in human APCs by signaling through the TLR1/TLR2 heterodimer. This leads to production of RA, which acts on TH cells to induce IL-5 and gut-homing integrin. RALDH2 induction by PN in APCs and RA-promoted TH2 differentiation could be an important factor determining allergic responses to peanut.
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Affiliation(s)
- Bert Ruiter
- Center for Immunology & Inflammatory Diseases, Massachusetts General Hospital, Boston, Mass; Harvard Medical School, Boston, Mass.
| | - Neal P Smith
- Center for Immunology & Inflammatory Diseases, Massachusetts General Hospital, Boston, Mass
| | - Elizabeth Fleming
- Center for Immunology & Inflammatory Diseases, Massachusetts General Hospital, Boston, Mass
| | - Sarita U Patil
- Center for Immunology & Inflammatory Diseases, Massachusetts General Hospital, Boston, Mass; Harvard Medical School, Boston, Mass; Food Allergy Center, Massachusetts General Hospital, Boston, Mass
| | - Barry K Hurlburt
- US Department of Agriculture, Agricultural Research Service, New Orleans, La
| | - Soheila J Maleki
- US Department of Agriculture, Agricultural Research Service, New Orleans, La
| | - Wayne G Shreffler
- Center for Immunology & Inflammatory Diseases, Massachusetts General Hospital, Boston, Mass; Harvard Medical School, Boston, Mass; Food Allergy Center, Massachusetts General Hospital, Boston, Mass
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Santos AF, Barbosa‐Morais NL, Hurlburt BK, Ramaswamy S, Hemmings O, Kwok M, O’Rourke C, Bahnson HT, Cheng H, James L, Gould HJ, Sutton BJ, Maleki SJ, Lack G. IgE to epitopes of Ara h 2 enhance the diagnostic accuracy of Ara h 2-specific IgE. Allergy 2020; 75:2309-2318. [PMID: 32248566 DOI: 10.1111/all.14301] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2019] [Revised: 02/14/2020] [Accepted: 02/20/2020] [Indexed: 11/30/2022]
Abstract
BACKGROUND Understanding the discrepancy between IgE sensitization and allergic reactions to peanut could facilitate diagnosis and lead to novel means of treating peanut allergy. OBJECTIVE To identify differences in IgE and IgG4 binding to peanut peptides between peanut-allergic (PA) and peanut-sensitized but tolerant (PS) children. METHODS PA (n = 56), PS (n = 42) and nonsensitized nonallergic (NA, n = 10) patients were studied. Synthetic overlapping 15-mer peptides of peanut allergens (Ara h 1-11) were spotted onto microarray slides, and patients' samples were tested for IgE and IgG4 binding using immunofluorescence. IgE and IgG4 levels to selected peptides were quantified using ImmunoCAP. Diagnostic model comparisons were performed using likelihood-ratio tests between each specified nominal logistic regression models. RESULTS Seven peptides on Ara h 1, Ara h 2, and Ara h 3 were bound more by IgE of PA compared to PS patients on the microarray. IgE binding to one peptide on Ara h 5 and IgG4 binding to one Ara h 9 peptide were greater in PS than in PA patients. Using ImmunoCAP, IgE to the Ara h 2 peptides enhanced the diagnostic accuracy of Ara h 2-specific IgE. Ratios of IgG4/IgE to 4 out of the 7 peptides were higher in PS than in PA subjects. CONCLUSIONS Ara h 2 peptide-specific IgE added diagnostic value to Ara h 2-specific IgE. Ability of peptide-specific IgG4 to surmount their IgE counterpart seems to be important in established peanut tolerance.
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Affiliation(s)
- Alexandra F. Santos
- Department of Women and Children’s Health (Paediatric Allergy) School of Life Course Sciences Faculty of Life Sciences and Medicine King’s College London London UK
- Peter Gorer Department of Immunobiology School of Immunology and Microbial Sciences, Faculty of Life Sciences and Medicine King’s College London London UK
- Children’s Allergy ServiceEvelina London Children's Hospital, Guy’s and St Thomas’ Hospital London UK
- Asthma UK Centre in Allergic Mechanisms of Asthma London UK
| | - Nuno L. Barbosa‐Morais
- Faculdade de Medicina Instituto de Medicina Molecular João Lobo Antunes Universidade de Lisboa Lisbon Portugal
| | - Barry K. Hurlburt
- US Department of Agriculture Southern Regional Research Center New Orleans LA USA
| | - Sneha Ramaswamy
- Asthma UK Centre in Allergic Mechanisms of Asthma London UK
- Randall Centre for Cell & Molecular Biophysics King’s College London London UK
| | - Oliver Hemmings
- Department of Women and Children’s Health (Paediatric Allergy) School of Life Course Sciences Faculty of Life Sciences and Medicine King’s College London London UK
- Peter Gorer Department of Immunobiology School of Immunology and Microbial Sciences, Faculty of Life Sciences and Medicine King’s College London London UK
- Asthma UK Centre in Allergic Mechanisms of Asthma London UK
| | - Matthew Kwok
- Department of Women and Children’s Health (Paediatric Allergy) School of Life Course Sciences Faculty of Life Sciences and Medicine King’s College London London UK
- Peter Gorer Department of Immunobiology School of Immunology and Microbial Sciences, Faculty of Life Sciences and Medicine King’s College London London UK
- Asthma UK Centre in Allergic Mechanisms of Asthma London UK
| | | | | | - Hsiaopo Cheng
- US Department of Agriculture Southern Regional Research Center New Orleans LA USA
| | - Louisa James
- Blizard Institute Queen Mary University of London London UK
| | - Hannah J. Gould
- Asthma UK Centre in Allergic Mechanisms of Asthma London UK
- Randall Centre for Cell & Molecular Biophysics King’s College London London UK
| | - Brian J. Sutton
- Asthma UK Centre in Allergic Mechanisms of Asthma London UK
- Randall Centre for Cell & Molecular Biophysics King’s College London London UK
| | - Soheila J. Maleki
- US Department of Agriculture Southern Regional Research Center New Orleans LA USA
| | - Gideon Lack
- Department of Women and Children’s Health (Paediatric Allergy) School of Life Course Sciences Faculty of Life Sciences and Medicine King’s College London London UK
- Peter Gorer Department of Immunobiology School of Immunology and Microbial Sciences, Faculty of Life Sciences and Medicine King’s College London London UK
- Children’s Allergy ServiceEvelina London Children's Hospital, Guy’s and St Thomas’ Hospital London UK
- Asthma UK Centre in Allergic Mechanisms of Asthma London UK
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Novak N, Maleki SJ, Cuadrado C, Crespo JF, Cabanillas B. Interaction of Monocyte-Derived Dendritic Cells with Ara h 2 from Raw and Roasted Peanuts. Foods 2020; 9:foods9070863. [PMID: 32630617 PMCID: PMC7404797 DOI: 10.3390/foods9070863] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2020] [Revised: 06/11/2020] [Accepted: 06/16/2020] [Indexed: 12/28/2022] Open
Abstract
Ara h 2 is a relevant peanut allergen linked to severe allergic reactions. The interaction of Ara h 2 with components of the sensitization phase of food allergy (e.g., dendritic cells) has not been investigated, and could be key to understanding the allergenic potential of this allergen. In this study, we aimed to analyze such interactions and the possible mechanism involved. Ara h 2 was purified from two forms of peanut, raw and roasted, and labeled with a fluorescent dye. Human monocyte-derived dendritic cells (MDDCs) were obtained, and experiments of Ara h 2 internalization by MDDCs were carried out. The role of the mannose receptor in the internalization of Ara h 2 from raw and roasted peanuts was also investigated. Results showed that Ara h 2 internalization by MDDCs was both time and dose dependent. Mannose receptors in MDDCs had a greater implication in the internalization of Ara h 2 from roasted peanuts. However, this receptor was also important in the internalization of Ara h 2 from raw peanuts, as opposed to other allergens such as raw Ara h 3.
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Affiliation(s)
- Natalija Novak
- Department of Dermatology and Allergy, University of Bonn Medical Center, DE–53127 Bonn, Germany;
| | - Soheila J. Maleki
- U.S. Department of Agriculture, Agriculture Research Service, Southern Regional Research Center, New Orleans, LA 70124, USA;
| | - Carmen Cuadrado
- Department of Food Technology, National Institute of Agricultural, Food Research and Technology (INIA), Ctra. La Coruña Km. 7.5, 28040 Madrid, Spain;
| | - Jesus F. Crespo
- Department of Allergy, Research Institute Hospital 12 de Octubre, Avenida de Córdoba s/n, 28041 Madrid, Spain;
| | - Beatriz Cabanillas
- Department of Allergy, Research Institute Hospital 12 de Octubre, Avenida de Córdoba s/n, 28041 Madrid, Spain;
- Correspondence:
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10
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Xie MM, Chen Q, Liu H, Yang K, Koh B, Wu H, Maleki SJ, Hurlburt BK, Cook-Mills J, Kaplan MH, Dent AL. T follicular regulatory cells and IL-10 promote food antigen-specific IgE. J Clin Invest 2020; 130:3820-3832. [PMID: 32255767 PMCID: PMC7324176 DOI: 10.1172/jci132249] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Accepted: 03/26/2020] [Indexed: 12/17/2022] Open
Abstract
Food allergies are a major clinical problem and are driven by IgE antibodies (Abs) specific for food antigens (Ags). T follicular regulatory (Tfr) cells are a specialized subset of FOXP3+ T cells that modulate Ab responses. Here, we analyzed the role of Tfr cells in regulating Ag-specific IgE using a peanut-based food allergy model in mice. Peanut-specific IgE titers and anaphylaxis responses were significantly blunted in Tfr cell-deficient Foxp3-Cre Bcl6fl/fl mice. Loss of Tfr cells led to greatly increased nonspecific IgE levels, showing that Tfr cells have both helper and suppressor functions in IgE production in the germinal center (GC) that work together to facilitate the production of Ag-specific IgE. Foxp3-Cre Ptenfl/fl mice with augmented Tfr cell responses had markedly higher levels of peanut-specific IgE, revealing an active helper function by Tfr cells on Ag-specific IgE. The helper function of Tfr cells for IgE production involves IL-10, and the loss of IL-10 signaling by B cells led to a severely curtailed peanut-specific IgE response, decreased GCB cell survival, and loss of GC dark zone B cells after peanut sensitization. We thus reveal that Tfr cells have an unexpected helper role in promoting food allergy and may represent a target for drug development.
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Affiliation(s)
| | - Qiang Chen
- Department of Microbiology and Immunology and
| | - Hong Liu
- Department of Microbiology and Immunology and
| | - Kai Yang
- Department of Pediatrics, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Byunghee Koh
- Department of Pediatrics, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Hao Wu
- Department of Microbiology and Immunology and
| | - Soheila J. Maleki
- Agricultural Research Service, United States Department of Agriculture, Baton Rouge, Louisiana, USA
| | - Barry K. Hurlburt
- Agricultural Research Service, United States Department of Agriculture, Baton Rouge, Louisiana, USA
| | - Joan Cook-Mills
- Department of Pediatrics, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Mark H. Kaplan
- Department of Pediatrics, Indiana University School of Medicine, Indianapolis, Indiana, USA
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11
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Nesbit JB, Schein CH, Braun BA, Gipson SAY, Cheng H, Hurlburt BK, Maleki SJ. Epitopes with similar physicochemical properties contribute to cross reactivity between peanut and tree nuts. Mol Immunol 2020; 122:223-231. [PMID: 32442779 DOI: 10.1016/j.molimm.2020.03.017] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Revised: 02/11/2020] [Accepted: 03/26/2020] [Indexed: 12/28/2022]
Abstract
Many individuals with peanut (PN) allergy have severe reactions to tree nuts (TN) such as walnuts or cashews. Although allergenic proteins in TN and PN have overall low identity, they share discrete sequences similar in physicochemical properties (PCP) to known IgE epitopes. Here, PCP-consensus peptides (cp, 13 aa and 31 aa) were identified from an alignment of epitope rich regions of walnut vicilin, Jug r 2, leader sequence (J2LS) and cross-reactive epitopes in the 2S albumins of peanut and synthesized. A peptide similarity search in the Structural Database of Allergenic Proteins (SDAP) revealed a network of peptides similar (low property distance, PD) to the 13 aa cp (13cp) in many different plant allergens. Peptides similar to the 13cp in PN and TN allergens bound IgE from sera of patients allergic to PN and TN in peptide microarray analysis. The 13cp was used to produce a rabbit consensus peptide antibody (cpAB) that detected proteins containing repeats similar to the 13cp in western blots of various nut extracts, in which reactive proteins were identified by mass spectrometry. The cpAB bound more specifically to allergens and nut extracts containing multiple repeats similar to the 13 cp, such as almond (Pru du 6), peanut (Ara h 2) and walnut (Jug r 2). IgE binding to various nut extracts is inhibited by recombinant J2LS sequence and synthetic 31cp. Thus, several repeated sequences similar to the 13cp are bound by IgE. Multiple similar repeats in several allergens could account for reaction severity and clinically relevant cross-reactivity to PN and TN. These findings may help improve detection, diagnostic, and therapeutic tools.
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Affiliation(s)
- Jacqueline B Nesbit
- Dept of Agriculture-Agricultural Research Service-Southern Regional Research Center (USDA-ARS-SRRC), New Orleans, LA, United States
| | - Catherine H Schein
- Department of Biochemistry and Molecular Biology, Institute for Human Infection and Immunity, University of Texas Medical Branch at Galveston (UTMB), TX, United States.
| | - Benjamin A Braun
- Department of Computer Science, Stanford University, United States
| | - Stephen A Y Gipson
- Dept of Agriculture-Agricultural Research Service-Southern Regional Research Center (USDA-ARS-SRRC), New Orleans, LA, United States
| | - Hsiaopo Cheng
- Dept of Agriculture-Agricultural Research Service-Southern Regional Research Center (USDA-ARS-SRRC), New Orleans, LA, United States
| | - Barry K Hurlburt
- Dept of Agriculture-Agricultural Research Service-Southern Regional Research Center (USDA-ARS-SRRC), New Orleans, LA, United States
| | - Soheila J Maleki
- Dept of Agriculture-Agricultural Research Service-Southern Regional Research Center (USDA-ARS-SRRC), New Orleans, LA, United States.
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12
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Abstract
Abstract
Allergies to peanuts are becoming an increasingly important health problem as a result of the persistence and severity of the reaction in allergic individuals. Because no treatment currently is available, avoidance is the only option for peanut-allergic individuals. Avoidance of an abundant and often disguised food such as peanuts, however, is very difficult; therefore, competitive inhibition ELISAs were developed to detect and quantitate each of the major peanut allergens, Ara h 1 and Ara h 2. Under optimal conditions for each assay, the sensitivity of the Ara h 1 and Ara h 2 detection assays were 12 and 0.5 ng/mL, respectively. These assays were primarily devised to effectively compare the levels of Ara h 1 and Ara h 2 in a wide variety of peanuts or peanut products but can also be used to identify cross-reactive antigens. The method is simple and rapid, requiring only one allergen-specific antibody and, therefore, could be adapted specifically to detect the presence of these individual allergens in different foods.
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Affiliation(s)
- David A Schmitt
- U.S. Department of Agriculture, Agricultural Research Service, Southern Regional Research Center, 1100 Robert E. Lee Blvd, New Orleans, LA 70124
| | - Hsiaopo Cheng
- U.S. Department of Agriculture, Agricultural Research Service, Southern Regional Research Center, 1100 Robert E. Lee Blvd, New Orleans, LA 70124
| | - Soheila J Maleki
- U.S. Department of Agriculture, Agricultural Research Service, Southern Regional Research Center, 1100 Robert E. Lee Blvd, New Orleans, LA 70124
| | - A Wesley Burks
- Duke University Department of Pediatrics, Allergy and Immunology Division, Durham, NC 27710
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13
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Maleki SJ, Crespo JF, Cabanillas B. Anti-inflammatory effects of flavonoids. Food Chem 2019; 299:125124. [PMID: 31288163 DOI: 10.1016/j.foodchem.2019.125124] [Citation(s) in RCA: 517] [Impact Index Per Article: 103.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2019] [Revised: 07/01/2019] [Accepted: 07/02/2019] [Indexed: 12/14/2022]
Abstract
Inflammation plays a key role in diseases such as diabetes, asthma, cardiovascular diseases and cancer. Diet can influence different stages of inflammation and can have an important impact on several inflammatory diseases. Increasing scientific evidence has shown that polyphenolic compounds, such as flavonoids, which are found in fruits, vegetables, legumes, or cocoa, can have anti-inflammatory properties. Recent studies have demonstrated that flavonoids can inhibit regulatory enzymes or transcription factors important for controlling mediators involved in inflammation. Flavonoids are also known as potent antioxidants with the potential to attenuate tissue damage or fibrosis. Consequently, numerous studies in vitro and in animal models have found that flavonoids have the potential to inhibit the onset and development of inflammatory diseases. In the present review, we focused in flavonoids, the most abundant polyphenols in the diet, to give an overview of the most recent scientific knowledge about their impact on different inflammatory diseases.
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Affiliation(s)
- Soheila J Maleki
- U.S. Department of Agriculture, Agriculture Research Service, Southern Regional Research Center, New Orleans, LA, USA
| | - Jesus F Crespo
- Servicio de Alergia, Hospital Universitario 12 de Octubre, Instituto de Investigación Hospital 12 de Octubre (i+12), Madrid, Spain
| | - Beatriz Cabanillas
- Servicio de Alergia, Hospital Universitario 12 de Octubre, Instituto de Investigación Hospital 12 de Octubre (i+12), Madrid, Spain; Department of Dermatology and Allergy, University of Bonn Medical Center, Sigmund- Freud-Str., 25, 53127 Bonn, Germany.
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14
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Shah F, Shi A, Ashley J, Kronfel C, Wang Q, Maleki SJ, Adhikari B, Zhang J. Peanut Allergy: Characteristics and Approaches for Mitigation. Compr Rev Food Sci Food Saf 2019; 18:1361-1387. [DOI: 10.1111/1541-4337.12472] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2018] [Revised: 05/19/2019] [Accepted: 05/22/2019] [Indexed: 12/19/2022]
Affiliation(s)
- Faisal Shah
- Inst. of Food Science and Technology, Chinese Academy of Agricultural Sciences/Key research Laboratory of Agro‐Products ProcessingMinistry of Agriculture Beijing 100193 P. R. China
| | - Aimin Shi
- Inst. of Food Science and Technology, Chinese Academy of Agricultural Sciences/Key research Laboratory of Agro‐Products ProcessingMinistry of Agriculture Beijing 100193 P. R. China
| | - Jon Ashley
- International Iberian Nanotechnology LaboratoryFood Quality and Safety Research group Berga 4715‐330 Portugal
| | - Christina Kronfel
- Food Processing and Sensory Quality ResearchUnited States Dept. of Agriculture New Orleans LA 70124 USA
| | - Qiang Wang
- Inst. of Food Science and Technology, Chinese Academy of Agricultural Sciences/Key research Laboratory of Agro‐Products ProcessingMinistry of Agriculture Beijing 100193 P. R. China
| | - Soheila J. Maleki
- Food Processing and Sensory Quality ResearchUnited States Dept. of Agriculture New Orleans LA 70124 USA
| | - Benu Adhikari
- School of ScienceRMIT Univ. Melbourne VIC 3083 Australia
| | - Jinchuang Zhang
- Inst. of Food Science and Technology, Chinese Academy of Agricultural Sciences/Key research Laboratory of Agro‐Products ProcessingMinistry of Agriculture Beijing 100193 P. R. China
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15
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Meng S, Li J, Chang S, Maleki SJ. Quantitative and kinetic analyses of peanut allergens as affected by food processing. Food Chem X 2019; 1:100004. [PMID: 31432004 PMCID: PMC6694862 DOI: 10.1016/j.fochx.2019.100004] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Revised: 12/11/2018] [Accepted: 01/09/2019] [Indexed: 01/22/2023]
Abstract
Peanuts contain four major allergens with differences in allergenic potency. Thermal processing can influence the allergenic properties of peanuts. Until now, a kinetic model has not been reported to assess the changes of soluble allergen (extracted from processed peanuts) content as affected by various thermal processing methods. Our objective is to characterize the reaction kinetics of the thermal processing methods, including wet processing (boiling with/without high-pressure, steaming with/without high-pressure), deep-frying and dry processing (microwaving and roasting) using five time intervals. The relationships between processing time and extractable major allergen content could be explained by a simple linear regression kinetic model (except high-pressure steaming). Among all the methods with optimal processing point, frying for 6 min had a relatively lower IgE binding (linear epitopes) ratio, possibly due to the processing conditions, which caused break down, cross-linking and aggregation of Ara h 2, and a relatively lower solubility.
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Affiliation(s)
- Shi Meng
- Department of Food Science, Nutrition, and Health Promotion, Mississippi State University, Mississippi State, MS 39762, USA
| | - Jiaxu Li
- Department of Biochemistry, Molecular Biology, Entomology and Plant Pathology, Mississippi State University, 32 Creelman Street, Mississippi State, MS 39762, USA
| | - Sam Chang
- Department of Food Science, Nutrition, and Health Promotion, Mississippi State University, Mississippi State, MS 39762, USA
- Coastal Research & Extension Center, 3411 Frederic Street, Pascagoula, MS 39567, USA
- Corresponding author at: Coastal Research & Extension Center, 3411 Frederic Street, Pascagoula, MS 39567, USA.
| | - Soheila J. Maleki
- United States Department of Agriculture, Agricultural Research Service, Southern Regional Research Center, 1100 Robert E. Lee Blvd., New Orleans, LA 70124, USA
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16
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Kronfel CM, Cheng H, Hurlburt BK, Simon RJ, Maleki SJ. IgE and IgG4 Epitope Profiles for the Major Peanut Allergens from Peanut Allergic Patients Undergoing Oral Immunotherapy. J Allergy Clin Immunol 2019. [DOI: 10.1016/j.jaci.2018.12.735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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17
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Maleki SJ, Nesbit JB, Hurlburt BK, Foo AC, DeRose EF, Cheng H, Mueller GA. The NMR structure and IgE Epitopes of Ara h 1 Leader Sequence. J Allergy Clin Immunol 2019. [DOI: 10.1016/j.jaci.2018.12.733] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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18
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Plundrich NJ, Cook BT, Maleki SJ, Fourches D, Lila MA. Binding of peanut allergen Ara h 2 with Vaccinium fruit polyphenols. Food Chem 2019; 284:287-295. [PMID: 30744860 DOI: 10.1016/j.foodchem.2019.01.081] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Revised: 01/08/2019] [Accepted: 01/08/2019] [Indexed: 01/30/2023]
Abstract
The potential for 42 different polyphenols found in Vaccinium fruits to bind to peanut allergen Ara h 2 and inhibit IgE binding epitopes was investigated using cheminformatics techniques. Out of 12 predicted binders, delphinidin-3-glucoside, cyanidin-3-glucoside, procyanidin C1, and chlorogenic acid were further evaluated in vitro. Circular dichroism, UV-Vis spectroscopy, and immunoblotting determined their capacity to (i) bind to Ara h 2, (ii) induce protein secondary structural changes, and (iii) inhibit IgE binding epitopes. UV-Vis spectroscopy clearly indicated that procyanidin C1 and chlorogenic acid interacted with Ara h 2, and circular dichroism results suggested that interactions with these polyphenols resulted in changes to Ara h 2 secondary structures. Immunoblotting showed that procyanidin C1 and chlorogenic acid bound to Ara h 2 significantly decreased the IgE binding capacity by 37% and 50%, respectively. These results suggest that certain polyphenols can inhibit IgE recognition of Ara h 2 by obstructing linear IgE epitopes.
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Affiliation(s)
- Nathalie J Plundrich
- Plants for Human Health Institute, Department of Food, Bioprocessing and Nutrition Sciences, North Carolina State University, North Carolina Research Campus, Kannapolis, NC 28081, USA
| | - Bethany T Cook
- Department of Chemistry, Bioinformatics Research Center, North Carolina State University, Raleigh, NC 27695, USA
| | - Soheila J Maleki
- United States Department of Agriculture-Agricultural Research Service-Southern Regional Research Center, New Orleans, LA 70124, USA
| | - Denis Fourches
- Department of Chemistry, Bioinformatics Research Center, North Carolina State University, Raleigh, NC 27695, USA
| | - Mary Ann Lila
- Plants for Human Health Institute, Department of Food, Bioprocessing and Nutrition Sciences, North Carolina State University, North Carolina Research Campus, Kannapolis, NC 28081, USA.
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19
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Bublin M, Kostadinova M, Radauer C, Varga EM, Hafner C, Schmidthaler K, Saidova A, Maleki SJ, Szépfalusi Z, Eiwegger T, Breiteneder H. Engineering of structural variants of the major peanut allergens Ara h 2 and Ara h 6 for allergen-specific immunotherapy. J Allergy Clin Immunol 2018; 143:1226-1229.e10. [PMID: 30414861 DOI: 10.1016/j.jaci.2018.10.039] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Revised: 08/27/2018] [Accepted: 10/12/2018] [Indexed: 10/27/2022]
Affiliation(s)
- Merima Bublin
- Department of Pathophysiology and Allergy Research, Medical University of Vienna, Vienna, Austria
| | - Maria Kostadinova
- Department of Pathophysiology and Allergy Research, Medical University of Vienna, Vienna, Austria
| | - Christian Radauer
- Department of Pathophysiology and Allergy Research, Medical University of Vienna, Vienna, Austria
| | - Eva-Maria Varga
- Department of Pediatrics, Respiratory and Allergic Disease Division, Medical University of Graz, Graz, Austria
| | - Christine Hafner
- Department of Dermatology, University Hospital St Poelten, Karl Landsteiner University of Health Sciences, St Poelten, Austria; Karl Landsteiner Institute for Dermatological Research, St Poelten, Austria
| | - Klara Schmidthaler
- Department of Pediatrics and Adolescent Medicine, Medical University of Vienna, Vienna, Austria
| | - Aziza Saidova
- Department of Pediatrics and Adolescent Medicine, Medical University of Vienna, Vienna, Austria
| | - Soheila J Maleki
- US Department of Agriculture, Agriculture Research Service, Southern Regional Research Center, New Orleans, La
| | - Zsolt Szépfalusi
- Department of Pediatrics and Adolescent Medicine, Medical University of Vienna, Vienna, Austria
| | - Thomas Eiwegger
- Department of Pediatrics and Adolescent Medicine, Medical University of Vienna, Vienna, Austria; Division of Immunology and Allergy, Food Allergy and Anaphylaxis Program, The Department of Paediatrics, The Hospital for Sick Children, Toronto, Ontario, Canada; Research Institute, The Hospital for Sick Children, Translational Medicine Program, Toronto, Ontario, Canada; Department of Immunology, The University of Toronto, Toronto, Ontario, Canada.
| | - Heimo Breiteneder
- Department of Pathophysiology and Allergy Research, Medical University of Vienna, Vienna, Austria
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20
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Cabanillas B, Maleki SJ, Cheng H, Novak N. Differences in the Uptake of Ara h 3 from Raw and Roasted Peanut by Monocyte-Derived Dendritic Cells. Int Arch Allergy Immunol 2018; 177:35-39. [PMID: 29879702 DOI: 10.1159/000489277] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2018] [Accepted: 04/13/2018] [Indexed: 01/13/2023] Open
Abstract
Roasting has been implicated in the increase of peanut allergenicity due to the chemical reactions that occur during the process. However, this increase is not fully understood, and little information is available regarding the role of roasted peanut allergens in the initial phase of allergy, where dendritic cells (DCs) play a key role. We sought to analyze differences in the internalization of Ara h 3 from raw and roasted peanut by immature monocyte-derived DCs (MDDCs) and the implication of the mannose receptor in the uptake. Ara h 3 was purified from raw and roasted peanut (Ara h 3-raw and Ara h 3-roas) and labeled with a fluorescent dye. The labeled allergens were added to MDDCs obtained from 7 donors and internalization was analyzed after 10, 30, and 120 min by flow cytometry. In parallel, mannan, which blocks the mannose receptor, was added 30 min before adding the labeled allergens. Results showed that the internalization of Ara h 3-roas by MDDCs was significantly increased at every time point. However, the increase in the internalization of Ara h 3-raw was only significant after 2 h of incubation. Ara h 3-roas had an enhanced capacity to be internalized by MDDCs in comparison with Ara h 3-raw at every time point. Blocking the mannose receptor decreased the internalization of Ara h 3-roas but not Ara h 3-raw. In conclusion, the internalization of Ara h 3-roas by the MDDCs is enhanced when compared to Ara h 3-raw, and the mannose receptor might be implicated in this enhancement.
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Affiliation(s)
- Beatriz Cabanillas
- Department of Dermatology and Allergy, University of Bonn Medical Center, Bonn, Germany
| | - Soheila J Maleki
- U.S. Department of Agriculture, Agriculture Research Service, Southern Regional Research Center, New Orleans, Louisiana, USA
| | - Hsiaopo Cheng
- U.S. Department of Agriculture, Agriculture Research Service, Southern Regional Research Center, New Orleans, Louisiana, USA
| | - Natalija Novak
- Department of Dermatology and Allergy, University of Bonn Medical Center, Bonn, Germany
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21
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Cuadrado C, Cheng H, Sanchiz A, Ballesteros I, Easson M, Grimm CC, Dieguez MC, Linacero R, Burbano C, Maleki SJ. Influence of enzymatic hydrolysis on the allergenic reactivity of processed cashew and pistachio. Food Chem 2018; 241:372-379. [DOI: 10.1016/j.foodchem.2017.08.120] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2016] [Revised: 08/30/2017] [Accepted: 08/31/2017] [Indexed: 11/26/2022]
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22
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Finley AN, Maleki SJ, Wild LG, Hurlburt BK. Characterizing the IgE Reactivity in Oral Allergy Syndrome to Celery and Carrots. J Allergy Clin Immunol 2018. [DOI: 10.1016/j.jaci.2017.12.774] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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23
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Hardy LC, Orgel K, Duan S, Maleki SJ, Burks AW, Paulson JC, Macauley M, Kulis MD. Using Siglec-engaging Tolerance-inducing Antigenic Liposomes (STALs) to reduce memory B cell responses to the major peanut allergen Ara h 2. J Allergy Clin Immunol 2018. [DOI: 10.1016/j.jaci.2017.12.634] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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24
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Kronfel CM, Cheng H, Hurlburt BK, Simon RJ, Maleki SJ. Epitope Mapping for the Non-Specific Lipid Transfer Proteins (nsLTP) Among Peanut Allergic Patients. J Allergy Clin Immunol 2018. [DOI: 10.1016/j.jaci.2017.12.756] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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25
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Hurlburt BK, Cheng H, Santos AF, Lack G, Maleki SJ. Epitope Mapping Walnut Allergens Jug r 1 and Jug r 2. J Allergy Clin Immunol 2018. [DOI: 10.1016/j.jaci.2017.12.570] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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26
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Nesbit JB, Cheng H, Hurlburt BK, Maleki SJ. Identification and assessment of the IgE epitopes of Ara h 1 and Jug r 2 leader sequences. J Allergy Clin Immunol 2018. [DOI: 10.1016/j.jaci.2017.12.571] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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27
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Kulis MD, Orgel K, Smeekens J, Maleki SJ, Hurlburt BK, Bagley K. A mouse model of walnut allergy mimics key features of the human disease. J Allergy Clin Immunol 2018. [DOI: 10.1016/j.jaci.2017.12.788] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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28
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Xu SS, Liu QM, Xiao AF, Maleki SJ, Alcocer M, Gao YY, Cao MJ, Liu GM. Eucheuma cottonii Sulfated Oligosaccharides Decrease Food Allergic Responses in Animal Models by Up-regulating Regulatory T (Treg) Cells. J Agric Food Chem 2017; 65:3212-3222. [PMID: 28359154 DOI: 10.1021/acs.jafc.7b00389] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In the present study, the anti-food allergy activity of Eucheuma cottonii sulfated oligosaccharide (ESO) was investigated. ESO was obtained by enzymatic degradation and purified by column chromatography. RBL-2H3 cells and BALB/c mouse model were used to test the anti-food allergy activity of ESO. The effects of ESO on the regulatory T (Treg) cells and bone marrow-derived mast cells (BMMCs) were investigated by flow cytometry. The results of in vivo assay showed that ESO decreased the levels of mast cell protease-1 and histamine and inhibited the levels of specific IgE by 77.7%. In addition, the production of interleukin (IL)-4 and IL-13 was diminished in the ESO groups compared to the non-ESO-treated group. Furthermore, ESO could up-regulate Treg cells by 22.2-97.1%. In conclusion, ESO decreased the allergy response in mice by reducing basophil degranulation, up-regulating Treg cells via Forkhead box protein 3 (Foxp3), and releasing IL-10. ESO may have preventive and therapeutic potential in allergic disease.
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Affiliation(s)
- Sha-Sha Xu
- College of Food and Biological Engineering, Xiamen Key Laboratory of Marine Functional Food, Fujian Provincial Engineering Technology Research Center of Marine Functional Food, Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, Jimei University , 43 Yindou Road, Xiamen 361021, Fujian, People's Republic of China
| | - Qing-Mei Liu
- College of Food and Biological Engineering, Xiamen Key Laboratory of Marine Functional Food, Fujian Provincial Engineering Technology Research Center of Marine Functional Food, Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, Jimei University , 43 Yindou Road, Xiamen 361021, Fujian, People's Republic of China
| | - An-Feng Xiao
- College of Food and Biological Engineering, Xiamen Key Laboratory of Marine Functional Food, Fujian Provincial Engineering Technology Research Center of Marine Functional Food, Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, Jimei University , 43 Yindou Road, Xiamen 361021, Fujian, People's Republic of China
| | - Soheila J Maleki
- Southern Regional Research Center, U.S. Department of Agriculture, Agriculture Research Service , 1100 Robert E. Lee Boulevard, New Orleans, Louisiana 70124, United States
| | - Marcos Alcocer
- School of Biosciences, The University of Nottingham , Sutton Bonington Campus, Loughborough LE12 5RD, United Kingdom
| | - Yuan-Yuan Gao
- College of Food and Biological Engineering, Xiamen Key Laboratory of Marine Functional Food, Fujian Provincial Engineering Technology Research Center of Marine Functional Food, Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, Jimei University , 43 Yindou Road, Xiamen 361021, Fujian, People's Republic of China
| | - Min-Jie Cao
- College of Food and Biological Engineering, Xiamen Key Laboratory of Marine Functional Food, Fujian Provincial Engineering Technology Research Center of Marine Functional Food, Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, Jimei University , 43 Yindou Road, Xiamen 361021, Fujian, People's Republic of China
| | - Guang-Ming Liu
- College of Food and Biological Engineering, Xiamen Key Laboratory of Marine Functional Food, Fujian Provincial Engineering Technology Research Center of Marine Functional Food, Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, Jimei University , 43 Yindou Road, Xiamen 361021, Fujian, People's Republic of China
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Yang Y, Zhang YX, Liu M, Maleki SJ, Zhang ML, Liu QM, Cao MJ, Su WJ, Liu GM. Triosephosphate Isomerase and Filamin C Share Common Epitopes as Novel Allergens of Procambarus clarkii. J Agric Food Chem 2017; 65:950-963. [PMID: 28072528 DOI: 10.1021/acs.jafc.6b04587] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Triosephosphate isomerase (TIM) is a key enzyme in glycolysis and has been identified as an allergen in saltwater products. In this study, TIM with a molecular mass of 28 kDa was purified from the freshwater crayfish (Procambarus clarkii) muscle. A 90-kDa protein that showed IgG/IgE cross-reactivity with TIM was purified and identified as filamin C (FLN c), which is an actin-binding protein. TIM showed similar thermal and pH stability with better digestion resistance compared with FLN c. The result of the surface plasmon resonance (SPR) experiment demonstrated the infinity of anti-TIM polyclonal antibody (pAb) to both TIM and FLN c. Five linear and 3 conformational epitopes of TIM, as well as 9 linear and 10 conformational epitopes of FLN c, were mapped by phage display. Epitopes of TIM and FLN c demonstrated the sharing of certain residues; the occurrence of common epitopes in the two allergens accounts for their cross-reactivity.
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Affiliation(s)
- Yang Yang
- College of Food and Biological Engineering, Xiamen Key Laboratory of Marine Functional Food, Fujian Provincial Engineering Technology Research Center of Marine Functional Food, Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, Jimei University , Xiamen, Fujian 361021, China
| | - Yong-Xia Zhang
- College of Food and Biological Engineering, Xiamen Key Laboratory of Marine Functional Food, Fujian Provincial Engineering Technology Research Center of Marine Functional Food, Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, Jimei University , Xiamen, Fujian 361021, China
| | - Meng Liu
- College of Food and Biological Engineering, Xiamen Key Laboratory of Marine Functional Food, Fujian Provincial Engineering Technology Research Center of Marine Functional Food, Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, Jimei University , Xiamen, Fujian 361021, China
| | - Soheila J Maleki
- Agricultural Research Service, Southern Regional Research Center, U. S. Department of Agriculture , New Orleans, Louisiana 70124, United States
| | - Ming-Li Zhang
- Xiamen Second Hospital , Xiamen, Fujian 361021, China
| | - Qing-Mei Liu
- College of Food and Biological Engineering, Xiamen Key Laboratory of Marine Functional Food, Fujian Provincial Engineering Technology Research Center of Marine Functional Food, Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, Jimei University , Xiamen, Fujian 361021, China
| | - Min-Jie Cao
- College of Food and Biological Engineering, Xiamen Key Laboratory of Marine Functional Food, Fujian Provincial Engineering Technology Research Center of Marine Functional Food, Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, Jimei University , Xiamen, Fujian 361021, China
| | - Wen-Jin Su
- College of Food and Biological Engineering, Xiamen Key Laboratory of Marine Functional Food, Fujian Provincial Engineering Technology Research Center of Marine Functional Food, Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, Jimei University , Xiamen, Fujian 361021, China
| | - Guang-Ming Liu
- College of Food and Biological Engineering, Xiamen Key Laboratory of Marine Functional Food, Fujian Provincial Engineering Technology Research Center of Marine Functional Food, Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, Jimei University , Xiamen, Fujian 361021, China
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Gregory JA, Shepley-McTaggart A, Umpierrez M, Hurlburt BK, Maleki SJ, Sampson HA, Mayfield SP, Berin MC. Immunotherapy using algal-produced Ara h 1 core domain suppresses peanut allergy in mice. Plant Biotechnol J 2016; 14:1541-50. [PMID: 26801740 PMCID: PMC5066676 DOI: 10.1111/pbi.12515] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Revised: 11/12/2015] [Accepted: 11/13/2015] [Indexed: 05/26/2023]
Abstract
Peanut allergy is an IgE-mediated adverse reaction to a subset of proteins found in peanuts. Immunotherapy aims to desensitize allergic patients through repeated and escalating exposures for several months to years using extracts or flours. The complex mix of proteins and variability between preparations complicates immunotherapy studies. Moreover, peanut immunotherapy is associated with frequent negative side effects and patients are often at risk of allergic reactions once immunotherapy is discontinued. Allergen-specific approaches using recombinant proteins are an attractive alternative because they allow more precise dosing and the opportunity to engineer proteins with improved safety profiles. We tested whether Ara h 1 and Ara h 2, two major peanut allergens, could be produced using chloroplast of the unicellular eukaryotic alga, Chlamydomonas reinhardtii. C. reinhardtii is novel host for producing allergens that is genetically tractable, inexpensive and easy to grow, and is able to produce more complex proteins than bacterial hosts. Compared to the native proteins, algal-produced Ara h 1 core domain and Ara h 2 have a reduced affinity for IgE from peanut-allergic patients. We further found that immunotherapy using algal-produced Ara h 1 core domain confers protection from peanut-induced anaphylaxis in a murine model of peanut allergy.
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Affiliation(s)
- James A Gregory
- Department of Pediatrics, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Ariel Shepley-McTaggart
- Department of Pediatrics, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Michelle Umpierrez
- Department of Pediatrics, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Barry K Hurlburt
- U.S. Department of Agriculture, Agricultural Research Service, Southern Regional Research Center, New Orleans, LA, USA
| | - Soheila J Maleki
- U.S. Department of Agriculture, Agricultural Research Service, Southern Regional Research Center, New Orleans, LA, USA
| | - Hugh A Sampson
- Department of Pediatrics, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Mindich Child Health and Development Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Stephen P Mayfield
- Department of Biology, University of California San Diego, La Jolla, CA, USA
| | - M Cecilia Berin
- Department of Pediatrics, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Mindich Child Health and Development Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
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Comstock SS, Maleki SJ, Teuber SS. Boiling and Frying Peanuts Decreases Soluble Peanut (Arachis Hypogaea) Allergens Ara h 1 and Ara h 2 But Does Not Generate Hypoallergenic Peanuts. PLoS One 2016; 11:e0157849. [PMID: 27310538 PMCID: PMC4911009 DOI: 10.1371/journal.pone.0157849] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2015] [Accepted: 06/06/2016] [Indexed: 11/18/2022] Open
Abstract
Peanut allergy continues to be a problem in most developed countries of the world. We sought a processing method that would alter allergenic peanut proteins, such that allergen recognition by IgE from allergic individuals would be significantly reduced or eliminated. Such a method would render accidental exposures to trace amounts of peanuts safer. A combination of boiling and frying decreased recovery of Ara h 1 and Ara h 2 at their expected MWs. In contrast, treatment with high pressures under varying temperatures had no effect on protein extraction profiles. Antibodies specific for Ara h 1, Ara h 2, and Ara h 6 bound proteins extracted from raw samples but not in boiled/fried samples. However, pre-incubation of serum with boiled/fried extract removed most raw peanut-reactive IgE from solution, including IgE directed to Ara h 1 and 2. Thus, this method of processing is unlikely to generate a peanut product tolerated by peanut allergic patients. Importantly, variability in individual patients' IgE repertoires may mean that some patients' IgE would bind fewer polypeptides in the sequentially processed seed.
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Affiliation(s)
- Sarah S Comstock
- Department of Internal Medicine, Division of Rheumatology, Allergy and Clinical Immunology, School of Medicine, University of California Davis, Davis, California, United States of America
| | - Soheila J Maleki
- United States Department of Agriculture-Agricultural Research Service-Southern Regional Research Center (USDA-ARS-SRRC), New Orleans, Louisiana, United States of America
| | - Suzanne S Teuber
- Department of Internal Medicine, Division of Rheumatology, Allergy and Clinical Immunology, School of Medicine, University of California Davis, Davis, California, United States of America
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Liu QM, Yang Y, Maleki SJ, Alcocer M, Xu SS, Shi CL, Cao MJ, Liu GM. Anti-Food Allergic Activity of Sulfated Polysaccharide from Gracilaria lemaneiformis is Dependent on Immunosuppression and Inhibition of p38 MAPK. J Agric Food Chem 2016; 64:4536-4544. [PMID: 27186807 DOI: 10.1021/acs.jafc.6b01086] [Citation(s) in RCA: 67] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Polysaccharides from Gracilaria lemaneiformis in particular possess various bioactive functions, but their antiallergic activity remains incompletely defined. Sulfated polysaccharide from Gracilaria lemaneiformis (GLSP) was obtained by water extraction and ethanol precipitation followed by column chromatography. BALB/c mice, RBL-2H3, and KU812 cells were used for verifying the anti food allergic activity of GLSP. According to the results of mice experiment, GLSP was able to alleviate allergy symptoms, to reduce TM-specific IgE and IgG1, to suppress Th2 cell polarization, and to promote the function of regulatory T (Treg) cells. In addition, GLSP had the ability to inhibit the function of RBL-2H3 cells. Furthermore, GLSP inhibited the activation of KU812 via suppression of p38 mitogen-activated protein kinase (MAPK). In conclusion, immunosuppression as well as the reduction in the level of p38 MAPK may contribute to GLSP's putative activity against food allergy. GLSP may be used as a functional food component for allergic patients.
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Affiliation(s)
- Qing-Mei Liu
- College of Food and Biological Engineering, Xiamen Key Laboratory of Marine Functional Food, Fujian Provincial Engineering Technology Research Center of Marine Functional Food, Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, Jimei University , 43 Yindou Road, Xiamen, 361021 Fujian, P.R. China
| | - Yang Yang
- College of Food and Biological Engineering, Xiamen Key Laboratory of Marine Functional Food, Fujian Provincial Engineering Technology Research Center of Marine Functional Food, Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, Jimei University , 43 Yindou Road, Xiamen, 361021 Fujian, P.R. China
| | - Soheila J Maleki
- U.S. Department of Agriculture, Agriculture Research Service , Southern Regional Research Center, 1100 Robert E. Lee Boulevard, New Orleans, Louisiana 70124, United States
| | - Marcos Alcocer
- School of Biosciences, Sutton Bonington Campus, University of Nottingham , Loughborough, LE125RD, United Kingdom
| | - Sha-Sha Xu
- College of Food and Biological Engineering, Xiamen Key Laboratory of Marine Functional Food, Fujian Provincial Engineering Technology Research Center of Marine Functional Food, Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, Jimei University , 43 Yindou Road, Xiamen, 361021 Fujian, P.R. China
| | - Chao-Lan Shi
- College of Food and Biological Engineering, Xiamen Key Laboratory of Marine Functional Food, Fujian Provincial Engineering Technology Research Center of Marine Functional Food, Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, Jimei University , 43 Yindou Road, Xiamen, 361021 Fujian, P.R. China
| | - Min-Jie Cao
- College of Food and Biological Engineering, Xiamen Key Laboratory of Marine Functional Food, Fujian Provincial Engineering Technology Research Center of Marine Functional Food, Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, Jimei University , 43 Yindou Road, Xiamen, 361021 Fujian, P.R. China
| | - Guang-Ming Liu
- College of Food and Biological Engineering, Xiamen Key Laboratory of Marine Functional Food, Fujian Provincial Engineering Technology Research Center of Marine Functional Food, Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, Jimei University , 43 Yindou Road, Xiamen, 361021 Fujian, P.R. China
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Johnson KL, Williams JG, Maleki SJ, Hurlburt BK, London RE, Mueller GA. Enhanced Approaches for Identifying Amadori Products: Application to Peanut Allergens. J Agric Food Chem 2016; 64:1406-1413. [PMID: 26811263 PMCID: PMC4813809 DOI: 10.1021/acs.jafc.5b05492] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The dry roasting of peanuts is suggested to influence allergic sensitization as a result of the formation of advanced glycation end products (AGEs) on peanut proteins. Identifying AGEs is technically challenging. The AGEs of a peanut allergen were probed with nano-scale liquid chromatography-electrospray ionization-mass spectrometry (nanoLC-ESI-MS) and tandem mass spectrometry (MS/MS) analyses. Amadori product ions matched to expected peptides and yielded fragments that included a loss of three waters and HCHO. As a result of the paucity of b and y ions in the MS/MS spectrum, standard search algorithms do not perform well. Reactions with isotopically labeled sugars confirmed that the peptides contained Amadori products. An algorithm was developed on the basis of information content (Shannon entropy) and the loss of water and HCHO. Results with test data show that the algorithm finds the correct spectra with high precision, reducing the time needed to manually inspect data. Computational and technical improvements allowed for better identification of the chemical differences between modified and unmodified proteins.
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Affiliation(s)
- Katina L. Johnson
- Epigenetics & Stem Cell Biology Laboratory, National Institute of Environmental Health Sciences
| | - Jason G. Williams
- Epigenetics & Stem Cell Biology Laboratory, National Institute of Environmental Health Sciences
| | | | | | - Robert E. London
- Genome Integrity & Structural Biology Laboratory, National Institute of Environmental Health Sciences
| | - Geoffrey A. Mueller
- Genome Integrity & Structural Biology Laboratory, National Institute of Environmental Health Sciences
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Maleki SJ, Cheng H, Wolf JC, Teuber SS, Schein C, Grimm CC, Hurlburt BK. Cross-Reactivity Among Peanut and Tree Nut Allergens. J Allergy Clin Immunol 2016. [DOI: 10.1016/j.jaci.2015.12.958] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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35
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Hurlburt BK, McBride J, Pote S, Chruszcz M, Maleki SJ. Ligand Binding Preferences of Pathogenesis-Related Class 10 (PR-10) Allergens. J Allergy Clin Immunol 2016. [DOI: 10.1016/j.jaci.2015.12.1017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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36
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Zhang YX, Chen HL, Maleki SJ, Cao MJ, Zhang LJ, Su WJ, Liu GM. Purification, Characterization, and Analysis of the Allergenic Properties of Myosin Light Chain in Procambarus clarkii. J Agric Food Chem 2015; 63:6271-6282. [PMID: 26083097 DOI: 10.1021/acs.jafc.5b01318] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Myosin light chain (MLC) plays a vital role in cell and muscle functions and has been identified as an allergen in shrimp. In this study, MLC with a molecular mass of 18 kDa was purified from crayfish (Procambarus clarkii) muscle. Its physicochemical characterization showed that the purified MLC is a glycoprotein with 4.3% carbohydrate, highly stable to heat, acid-alkali, and digestion, and weakly retains IgE-binding activity when its secondary structure was altered. Serological assays suggested that conformational epitopes predominate over linear epitopes in the purified MLC. Two isoforms of the MLC gene (MLC1 and MLC2) were cloned, and the purified MLC was identified as MLC1. Analysis of the secondary and tertiary structures of the MLCs indicated that MLC1 has four conformational epitopes and three linear epitopes, whereas MLC2 had a major conformational epitope and three linear epitopes. These results are significant for understanding hypersensitization of humans to crayfish.
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Affiliation(s)
- Yong-Xia Zhang
- †College of Food and Biological Engineering, Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, Jimei University, 43 Yindou Road, Xiamen, Fujian 361021, China
| | - Heng-Li Chen
- †College of Food and Biological Engineering, Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, Jimei University, 43 Yindou Road, Xiamen, Fujian 361021, China
| | - Soheila J Maleki
- ‡Agriculture Research Service, Southern Regional Research Center, U.S. Department of Agriculture, 1100 Robert E. Lee Boulevard, New Orleans, Louisiana 70124, United States
| | - Min-Jie Cao
- †College of Food and Biological Engineering, Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, Jimei University, 43 Yindou Road, Xiamen, Fujian 361021, China
| | - Ling-Jing Zhang
- †College of Food and Biological Engineering, Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, Jimei University, 43 Yindou Road, Xiamen, Fujian 361021, China
| | - Wen-Jin Su
- †College of Food and Biological Engineering, Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, Jimei University, 43 Yindou Road, Xiamen, Fujian 361021, China
| | - Guang-Ming Liu
- †College of Food and Biological Engineering, Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, Jimei University, 43 Yindou Road, Xiamen, Fujian 361021, China
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Chandran M, Chu Y, Maleki SJ, Ozias-Akins P. Stability of transgene expression in reduced allergen peanut (Arachis hypogaea L.) across multiple generations and at different soil sulfur levels. J Agric Food Chem 2015; 63:1788-1797. [PMID: 25616282 DOI: 10.1021/jf504892f] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Transgenic peanut (Arachis hypogaea L.) containing a gene designed for RNA interference (RNAi) showed stable complete silencing of Ara h 2 and partial silencing of Ara h 6, two potent peanut allergens/proteins, along with minimal collateral changes to other allergens, Ara h 1 and Ara h 3, across three generations (T3, T4, and T5) under field conditions. Different soil sulfur levels (0.012, 0.3, and 3.0 mM) differentially impacted sulfur-rich (Ara h 2, Ara h 3, and Ara h 6) versus sulfur-poor (Ara h 1) proteins in non-transgenic versus transgenic peanut. The sulfur level had no effect on Ara h 1, whereas low sulfur led to a significant reduction of Ara h 3 in transgenic and non-transgenic seeds and Ara h 2 and Ara h 6 in non-transgenic but not in transgenic peanuts because these proteins already were reduced by gene silencing. These results demonstrate stability of transgene expression and the potential utility of RNAi in allergen manipulation.
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Affiliation(s)
- Manju Chandran
- Department of Horticulture, University of Georgia , Tifton, Georgia 31793-5766, United States
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38
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Hurlburt BK, Cheng H, Offermann L, Chruszcz M, Santos AF, Lack G, Maleki SJ. Epitope Mapping the Peanut Panallergen Ara h 8. J Allergy Clin Immunol 2015. [DOI: 10.1016/j.jaci.2014.12.1033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Maleki SJ, Bublin M, Chruszcz M, Charles T, Grimm CC, Cheng H, Teuber SS, Hurlburt BK, Breiteneder H, Schein C. Identification of the Epitopes That Cause Cross-Reactions Between Peanuts and Tree Nuts. J Allergy Clin Immunol 2015. [DOI: 10.1016/j.jaci.2014.12.1035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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40
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Hurlburt BK, McBride JK, Nesbit JB, Ruan S, Maleki SJ. Purification of Recombinant Peanut Allergen Ara h 1 and Comparison of IgE Binding to the Natural Protein. Foods 2014; 3:642-657. [PMID: 28234343 PMCID: PMC5302246 DOI: 10.3390/foods3040642] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2014] [Revised: 11/24/2014] [Accepted: 11/29/2014] [Indexed: 11/16/2022] Open
Abstract
Allergic reactions to food are on the rise worldwide and there is a corresponding increase in interest to understand the molecular mechanisms responsible. Peanut allergies are the most problematic because the reaction often persists into adulthood and can be as severe as anaphylaxis and death. The purpose of the work presented here was to develop a reproducible method to produce large quantities of pure recombinant Ara h 1(rAra h 1) that will enable standardization of immunological tests for patients and allow structural and immunological studies on the wild type and mutagenized forms of the protein. Ara h 1 is initially a pre-pro-protein which, following two endoproteolytic cleavages, becomes the mature form found in peanut. The mature form however has flexible regions that make it refractory to some structural studies including crystallography. Therefore, independent purification of the mature and core regions was desirable. Expression constructs were synthesized cDNA clones for each in a pET plasmid vector without tags. Codons were optimized for expression in E. coli. High-level expression was achieved in BL21 strains. Purification to near homogeneity was achieved by a combination of ammonium sulfate precipitation and ion exchange chromatography. The purified rAra h 1 was then compared with natural Ara h 1 for IgE binding. All patients recognized both the folded natural and rAra h 1, but the IgE binding to the rArah1 was significantly reduced in comparison to the natural allergen, which could potentially make it useful for immunotherapeutic purposes.
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Affiliation(s)
- Barry K Hurlburt
- Southern Regional Research Center, Agricultural Research Service, United States Department of Agriculture, 1100 Robert E. Lee, Blvd., New Orleans, LA 70124, USA.
| | - Jane K McBride
- Southern Regional Research Center, Agricultural Research Service, United States Department of Agriculture, 1100 Robert E. Lee, Blvd., New Orleans, LA 70124, USA.
| | - Jacqueline B Nesbit
- Southern Regional Research Center, Agricultural Research Service, United States Department of Agriculture, 1100 Robert E. Lee, Blvd., New Orleans, LA 70124, USA.
| | - Sanbao Ruan
- Southern Regional Research Center, Agricultural Research Service, United States Department of Agriculture, 1100 Robert E. Lee, Blvd., New Orleans, LA 70124, USA.
| | - Soheila J Maleki
- Southern Regional Research Center, Agricultural Research Service, United States Department of Agriculture, 1100 Robert E. Lee, Blvd., New Orleans, LA 70124, USA.
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Tordesillas L, Goswami R, Benedé S, Grishina G, Dunkin D, Järvinen KM, Maleki SJ, Sampson HA, Berin MC. Skin exposure promotes a Th2-dependent sensitization to peanut allergens. J Clin Invest 2014; 124:4965-75. [PMID: 25295541 DOI: 10.1172/jci75660] [Citation(s) in RCA: 150] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2014] [Accepted: 09/04/2014] [Indexed: 01/21/2023] Open
Abstract
Sensitization to foods often occurs in infancy, without a known prior oral exposure, suggesting that alternative exposure routes contribute to food allergy. Here, we tested the hypothesis that peanut proteins activate innate immune pathways in the skin that promote sensitization. We exposed mice to peanut protein extract on undamaged areas of skin and observed that repeated topical exposure to peanut allergens led to sensitization and anaphylaxis upon rechallenge. In mice, this epicutaneous peanut exposure induced sensitization to the peanut components Ara h 1 and Ara h 2, which is also observed in human peanut allergy. Both crude peanut extract and Ara h 2 alone served as adjuvants, as both induced a bystander sensitization that was similar to that induced by the atopic dermatitis-associated staphylococcal enterotoxin B. In cultured human keratinocytes and in murine skin, peanut extract directly induced cytokine expression. Moreover, topical peanut extract application induced an alteration dependent on the IL-33 receptor ST2 in skin-draining DCs, resulting in Th2 cytokine production from T cells. Together, our data support the hypothesis that peanuts are allergenic due to inherent adjuvant activity and suggest that skin exposure to food allergens contributes to sensitization to foods in early life.
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Maleki SJ, Schmitt DA, Galeano M, Hurlburt BK. Comparison of the Digestibility of the Major Peanut Allergens in Thermally Processed Peanuts and in Pure Form. Foods 2014; 3:290-303. [PMID: 28234320 PMCID: PMC5302360 DOI: 10.3390/foods3020290] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2014] [Revised: 04/08/2014] [Accepted: 04/25/2014] [Indexed: 11/16/2022] Open
Abstract
It has been suggested that the boiling or frying of peanuts leads to less allergenic products than roasting. Here, we have compared the digestibility of the major peanut allergens in the context of peanuts subjected to boiling, frying or roasting and in purified form. The soluble peanut extracts and the purified allergens were digested with either trypsin or pepsin and analyzed by gel electrophoresis and western blot. T-cell proliferation was measured for the purified allergens. In most cases, boiled and raw peanut proteins were similarly digestible, but the Ara h 1 protein in the boiled extracts was more resistant to digestion. Most proteins from fried and roasted peanuts were more resistant to digestion than in raw and boiled samples, and more IgE binding fragments survived digestion. High-molecular-weight fragments of Ara h1 were resistant to digestion in fried and roasted samples. Ara h 1 and Ara h 2 purified from roasted peanuts were the most resistant to digestion, but differed in their ability to stimulate T-cells. The differences in digestibility and IgE binding properties of the major allergens in roasted, fried and boiled peanuts may not explain the difference between the prevalence of peanut allergy in different countries that consume peanut following these varied processing methods.
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Affiliation(s)
- Soheila J Maleki
- Southern Regional Research Center, Agricultural Research Service, U.S. Department of Agriculture, 1100 Robert E. Lee Blvd, New Orleans, LA 70124, USA.
| | - David A Schmitt
- Southern Regional Research Center, Agricultural Research Service, U.S. Department of Agriculture, 1100 Robert E. Lee Blvd, New Orleans, LA 70124, USA.
| | - Maria Galeano
- Southern Regional Research Center, Agricultural Research Service, U.S. Department of Agriculture, 1100 Robert E. Lee Blvd, New Orleans, LA 70124, USA.
| | - Barry K Hurlburt
- Southern Regional Research Center, Agricultural Research Service, U.S. Department of Agriculture, 1100 Robert E. Lee Blvd, New Orleans, LA 70124, USA.
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Abstract
Peanut allergens can trigger a potent and sometimes dangerous immune response in an increasing number of people. The molecular structures of these allergens form the basis for understanding this response. This review describes the currently known peanut allergen structures and discusses how modifications both enzymatic and non-enzymatic affect digestion, innate immune recognition, and IgE interactions. The allergen structures help explain cross-reactivity among allergens from different sources, which is useful in improving patient diagnostics. Surprisingly, it was recently noted that similar short peptide sequences among unrelated peanut allergens could also be a source of cross-reactivity. The molecular features of peanut allergens continue to inform predictions and provide new research directions in the study of allergic disease.
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Affiliation(s)
- Geoffrey A Mueller
- Laboratory of Structural Biology, National Institute of Environmental Health Sciences, 111 T.W. Alexander Drive, MD-MR-01, Research Triangle Park, NC, 27709, USA,
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Charles T, Grimm CC, McBride J, Landry S, Maleki SJ. Simulated Roasting Affects Patient IgE Binding To Ara h 2. J Allergy Clin Immunol 2014. [DOI: 10.1016/j.jaci.2013.12.431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Fleming E, Ruiter B, Hurlburt BK, Maleki SJ, Shreffler WG. Monocytes From Peanut-Allergic Patients Express Higher Levels Of RALDH2 In Response To Peanut Protein Than Monocytes From Tolerant Subjects. J Allergy Clin Immunol 2014. [DOI: 10.1016/j.jaci.2013.12.345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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46
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Ruiter B, Fleming E, Hurlburt BK, Maleki SJ, Shreffler WG. Peanut Protein Induces Expression Of RALDH2 In Human Dendritic Cells In a TLR2-Dependent Manner. J Allergy Clin Immunol 2014. [DOI: 10.1016/j.jaci.2013.12.346] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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47
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Rose KM, Plaisance C, Grimm CC, Cheng H, Charles T, Jortani SA, Maleki SJ. Detection Of Peanut Allergens In Breast Milk and Saliva. J Allergy Clin Immunol 2014. [DOI: 10.1016/j.jaci.2013.12.425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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48
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Hurlburt BK, Offermann LR, McBride JK, Majorek KA, Maleki SJ, Chruszcz M. Structure and function of the peanut panallergen Ara h 8. J Biol Chem 2013; 288:36890-901. [PMID: 24253038 PMCID: PMC3873548 DOI: 10.1074/jbc.m113.517797] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2013] [Revised: 11/13/2013] [Indexed: 11/06/2022] Open
Abstract
The incidence of peanut allergy continues to rise in the United States and Europe. Whereas exposure to the major allergens Ara h 1, 2, 3, and 6 can cause fatal anaphylaxis, exposure to the minor allergens usually does not. Ara h 8 is a minor allergen. Importantly, it is the minor food allergens that are thought to be responsible for oral allergy syndrome (OAS), in which sensitization to airborne allergens causes a Type 2 allergic reaction to ingested foods. Furthermore, it is believed that similar protein structure rather than a similar linear sequence is the cause of OAS. Bet v 1 from birch pollen is a common sensitizing agent, and OAS results when patients consume certain fruits, vegetables, tree nuts, and peanuts. Here, we report the three-dimensional structure of Ara h 8, a Bet v 1 homolog. The overall fold is very similar to that of Bet v 1, Api g 1 (celery), Gly m 4 (soy), and Pru av 1 (cherry). Ara h 8 binds the isoflavones quercetin and apigenin as well as resveratrol avidly.
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Affiliation(s)
- Barry K. Hurlburt
- From the Southern Regional Research Center, Agricultural Research Service, United States Department of Agriculture, New Orleans, Louisiana 70124
| | - Lesa R. Offermann
- the Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, and
| | - Jane K. McBride
- From the Southern Regional Research Center, Agricultural Research Service, United States Department of Agriculture, New Orleans, Louisiana 70124
| | - Karolina A. Majorek
- the Department of Molecular Physiology and Biological Physics, University of Virginia, Charlottesville, Virginia 22908
| | - Soheila J. Maleki
- From the Southern Regional Research Center, Agricultural Research Service, United States Department of Agriculture, New Orleans, Louisiana 70124
| | - Maksymilian Chruszcz
- the Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, and
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Bublin M, Kostadinova M, Radauer C, Hafner C, Szépfalusi Z, Varga EM, Maleki SJ, Breiteneder H, Hoffmann-Sommergruber K. IgE cross-reactivity between the major peanut allergen Ara h 2 and the non-homologous allergens Ara h 1 and Ara h 3. Clin Transl Allergy 2013. [PMCID: PMC3723898 DOI: 10.1186/2045-7022-3-s3-p85] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Schein C, Teuber SS, Cheng H, Grimm CC, Maleki SJ. Antibodies to the Physiochemical-Consensus Sequence of Jug r 2 Containing Glutamine-Rich Repeats Bind Allergens in Peanuts and Other Tree Nuts. J Allergy Clin Immunol 2013. [DOI: 10.1016/j.jaci.2012.12.753] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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