title: Immunoreactivity of hen egg allergens: influence on in vitro gastrointestinal digestion of the presence of other egg white proteins and of egg yolk.
abstract: Hen egg white comprises of a complex mixture of proteins, which greatly differ in their physicochemical characteristics and relative abundance. We aimed to identify potential undiscovered egg allergens within the egg white proteome and investigated the existence of matrix effects on the proteolytic stability and resultant IgE-binding of the allergenic proteins. In addition to the main egg allergens: ovalbumin (OVA), ovomucoid (OM) and lysozyme (LYS), two minor egg white proteins, tentatively identified as ovoinhibitor and clusterin, were found to react with serum IgE from egg-allergic patients. Egg white exhibited residual immunoreactivity after gastrointestinal digestion due to the presence of intact OVA and LYS, as well as of several IgE-binding peptides derived from OVA. The presence of egg yolk slightly increased the susceptibility to hydrolysis of egg white proteins and abrogated bile salt-induced precipitation of LYS in the duodenal medium. However, the resultant immunoreactivity against IgE of egg white proteins after in vitro digestion was not significantly modified by the presence of yolk components.
authors.affiliation: Instituto de Investigación en Ciencias de la Alimentación, CIAL (CSIC-UAM), Nicolás Cabrera 9, 28049 Madrid, Spain.
authors.forename: Gustavo
authors.initials: G
authors.lastname: Martos
authors.forename: Rosina
authors.initials: R
authors.lastname: López-Fandiño
authors.forename: Elena
authors.initials: E
authors.lastname: Molina
mesh_terms: D000485:Allergens / Q000032:analysis* / Q000276:immunology; D000818:Animals; D002645:Chickens; D004063:Digestion; D004527:Egg Proteins / Q000032:analysis* / Q000276:immunology; D004530:Egg Yolk / Q000276:immunology*; D005512:Food Hypersensitivity / Q000276:immunology / Q000378:metabolism*; D041981:Gastrointestinal Tract / Q000276:immunology / Q000378:metabolism*; D006801:Humans; D007073:Immunoglobulin E / Q000032:analysis / Q000276:immunology; D008954:Models, Biological
chemical_list: D000485:Allergens; D004527:Egg Proteins; D007073:Immunoglobulin E