title: Serum allergen-specific IgA is not associated with natural or induced tolerance to egg in children.
abstract: The role of specific IgA (sIgA) in oral immunotherapy (OIT) and natural tolerance to foods is poorly understood. We aimed to study serum sIgA in induced and natural tolerance to egg. Children aged 5-16 years diagnosed with IgE-mediated egg allergy were recruited. After egg challenge, patients were classified as transient (TEA) or persistent (PEA) egg-allergic. PEA children were further divided into oral immunotherapy (PEA-OIT) or egg avoidance (PEA-EA). Allergy/tolerance was reassessed 9-12 months later (T1) in PEA-EA. Serum sIgA to ovalbumin and ovomucoid were determined at inclusion in all patients and repeated in PEA at T1. 21 TEA and 52 PEA children were recruited (28 PEA-OIT, 24 PEA-EA). Serum sIgA remained unchanged after OIT. TEA and PEA had similar serum sIgA. No specific trend on serum sIgA was observed in five PEA-EA who developed natural tolerance over follow-up. Thus, serum sIgA seems not to be associated with induced or natural egg tolerance.
authors.affiliation: Paediatric Allergy and Clinical Immunology Department, Hospital Sant Joan de Déu, Universitat de Barcelona, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Vazquez-Ortiz
authors.forename: M
authors.initials: M
authors.lastname: Pascal
authors.forename: M
authors.initials: M
authors.lastname: Juan
authors.forename: L
authors.initials: L
authors.lastname: Alsina
authors.forename: M A
authors.initials: MA
authors.lastname: Martín-Mateos
authors.forename: A M
authors.initials: AM
authors.lastname: Plaza
mesh_terms: D000293:Adolescent; D000485:Allergens / Q000276:immunology*; D000918:Antibody Specificity / Q000276:immunology; D002648:Child; D002675:Child, Preschool; D003888:Desensitization, Immunologic; D021181:Egg Hypersensitivity / Q000097:blood / Q000175:diagnosis / Q000276:immunology* / Q000628:therapy; D004531:Eggs / Q000009:adverse effects*; D005260:Female; D006801:Humans; D007108:Immune Tolerance; D007070:Immunoglobulin A / Q000097:blood / Q000276:immunology*; D007073:Immunoglobulin E / Q000097:blood / Q000276:immunology; D008297:Male; D010047:Ovalbumin / Q000276:immunology; D010059:Ovomucin / Q000276:immunology
chemical_list: D000485:Allergens; D007070:Immunoglobulin A; D010059:Ovomucin; D007073:Immunoglobulin E; D010047:Ovalbumin
keywords: IgA; basic mechanisms; food allergy; immunotherapy; natural tolerance