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Curciarello R, Smaldini PL, Candreva AM, González V, Parisi G, Cauerhff A, Barrios I, Blanch LB, Fossati CA, Petruccelli S, Docena GH. Targeting a cross-reactive Gly m 5 soy peptide as responsible for hypersensitivity reactions in a milk allergy mouse model. PLoS One 2014; 9:e82341. [PMID: 24416141 PMCID: PMC3886974 DOI: 10.1371/journal.pone.0082341] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2013] [Accepted: 10/29/2013] [Indexed: 11/18/2022] Open
Abstract
Background Cross-reactivity between soybean allergens and bovine caseins has been previously reported. In this study we aimed to map epitopes of the major soybean allergen Gly m 5 that are co-recognized by casein specific antibodies, and to identify a peptide responsible for the cross-reactivity. Methods Cow's milk protein (CMP)-specific antibodies were used in different immunoassays (immunoblotting, ELISA, ELISA inhibition test) to evaluate the in vitro recognition of soybean proteins (SP). Recombinant Gly m 5 (α), a truncated fragment containing the C-terminal domain (α-T) and peptides of α-T were obtained and epitope mapping was performed with an overlapping peptide assay. Bioinformatics tools were used for epitope prediction by sequence alignment, and for modelling the cross-recognized soy proteins and peptides. The binding of SP to a monoclonal antibody was studied by surface Plasmon resonance (SPR). Finally, the in vivo cross-recognition of SP was assessed in a mouse model of milk allergy. Results Both α and α-T reacted with the different CMP-specific antibodies. α-T contains IgG and IgE epitopes in several peptides, particularly in the peptide named PA. Besides, we found similar values of association and dissociation constants between the α-casein specific mAb and the different milk and soy components. The food allergy mouse model showed that SP and PA contain the cross-reactive B and T epitopes, which triggered hypersensitivity reactions and a Th2-mediated response on CMP-sensitized mice. Conclusions Gly m 5 is a cross-reactive soy allergen and the α-T portion of the molecule contains IgG and IgE immunodominant epitopes, confined to PA, a region with enough conformation to be bound by antibodies. These findings contribute to explain the intolerance to SP observed in IgE-mediated CMA patients, primarily not sensitised to SP, as well as it sets the basis to propose a mucosal immunotherapy for milk allergy using this soy peptide.
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Affiliation(s)
- Renata Curciarello
- Laboratorio de Investigaciones del Sistema Inmune-LISIN, Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, La Plata, Buenos Aires, Argentina
- Centro de Investigaciones y Desarrollo en Criotecnología de Alimentos-CIDCA, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, La Plata, Buenos Aires, Argentina
| | - Paola L. Smaldini
- Laboratorio de Investigaciones del Sistema Inmune-LISIN, Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, La Plata, Buenos Aires, Argentina
| | - Angela M. Candreva
- Laboratorio de Investigaciones del Sistema Inmune-LISIN, Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, La Plata, Buenos Aires, Argentina
- Centro de Investigaciones y Desarrollo en Criotecnología de Alimentos-CIDCA, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, La Plata, Buenos Aires, Argentina
| | - Virginia González
- Centro de Estudios e Investigaciones, Departamento de Ciencias y Tecnología Universidad Nacional de Quilmes, Quilmes, Buenos Aires, Argentina
| | - Gustavo Parisi
- Centro de Estudios e Investigaciones, Departamento de Ciencias y Tecnología Universidad Nacional de Quilmes, Quilmes, Buenos Aires, Argentina
| | - Ana Cauerhff
- Centro de Investigación y Desarrollo en Fermentaciones Industriales, CINDEFI (UNLP y CONICET) and Instituto de Investigaciones Bioquímicas de Buenos Aires (IIBBA-CONICET), Fundación Instituto Leloir, Buenos Aires, Argentina
| | - Ivana Barrios
- Cátedra de Química Medicinal, Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, La Plata, Buenos Aires, Argentina
| | - Luis Bruno Blanch
- Cátedra de Química Medicinal, Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, La Plata, Buenos Aires, Argentina
| | - Carlos A. Fossati
- Laboratorio de Investigaciones del Sistema Inmune-LISIN, Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, La Plata, Buenos Aires, Argentina
| | - Silvana Petruccelli
- Centro de Investigaciones y Desarrollo en Criotecnología de Alimentos-CIDCA, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, La Plata, Buenos Aires, Argentina
| | - Guillermo H. Docena
- Laboratorio de Investigaciones del Sistema Inmune-LISIN, Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, La Plata, Buenos Aires, Argentina
- Centro de Investigaciones y Desarrollo en Criotecnología de Alimentos-CIDCA, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, La Plata, Buenos Aires, Argentina
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