title: Differences in allergenic potential of food extracts following oral exposure in mice reflect differences in digestibility: potential approaches to safety assessment.
abstract: An animal model for food allergy is needed to assess genetically modified food crops for potential allergenicity. The ideal model must produce allergic antibody (IgE) to proteins differentially according to known allergenicity before being used to accurately identify potential allergens among novel proteins. The oral route is the most relevant for exposure to food antigens, and a protein's stability to digestion is a current risk assessment tool based on this natural route. However, normal laboratory animals do not mount allergic responses to proteins administered orally due to oral tolerance, an immunologic mechanism which specifically suppresses IgE. To circumvent oral tolerance and evoke differential IgE responses to a panel of allergenic and nonallergenic food extracts, female C3H/HeJ mice were exposed subcutaneously or orally with cholera toxin as an adjuvant. All foods elicited IgE by the subcutaneous route. Oral exposure, however, resulted in IgE to allergens (peanut, Brazil nut, and egg white) but not to nonallergens (spinach and turkey), provided that the dose and exposures were limited. Additionally, in vitro digestibility assays demonstrated the presence of digestion-stable proteins in the allergenic food extracts but not in the nonallergenic foods. Our results suggest that the subcutaneous route is inadequate to distinguish allergens from nonallergens, but oral exposure under the appropriate experimental conditions will result in differential allergic responses in accordance with known allergenicity. Moreover, those foods containing digestion-resistant proteins provoke allergic responses in this model, supporting the current use of pepsin resistance in the decision tree for potential allergenicity assessment.
authors.affiliation: Immunotoxicology Branch, Experimental Toxicology Division, National Health and Environmental Effects Research Laboratory, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina 27711, USA. bowman.christal@epa.gov
authors.forename: Christal C
authors.initials: CC
authors.lastname: Bowman
authors.forename: Maryjane K
authors.initials: MK
authors.lastname: Selgrade
mesh_terms: D000276:Adjuvants, Immunologic / Q000008:administration & dosage; D000284:Administration, Oral; D000818:Animals; D002772:Cholera Toxin / Q000008:administration & dosage; D004044:Dietary Proteins / Q000008:administration & dosage / Q000276:immunology* / Q000378:metabolism; D004063:Digestion; D004195:Disease Models, Animal; D004306:Dose-Response Relationship, Immunologic; D021181:Egg Hypersensitivity / Q000276:immunology / Q000503:physiopathology; D005260:Female; D005512:Food Hypersensitivity / Q000276:immunology* / Q000503:physiopathology; D030841:Food, Genetically Modified; D007108:Immune Tolerance; D007073:Immunoglobulin E / Q000097:blood*; D007279:Injections, Subcutaneous; D051379:Mice; D008809:Mice, Inbred C3H; D021184:Nut Hypersensitivity / Q000276:immunology / Q000503:physiopathology; D021183:Peanut Hypersensitivity / Q000276:immunology / Q000503:physiopathology; D010434:Pepsin A / Q000378:metabolism; D011489:Protein Denaturation; D018570:Risk Assessment; D013997:Time Factors
chemical_list: D000276:Adjuvants, Immunologic; D004044:Dietary Proteins; D007073:Immunoglobulin E; D002772:Cholera Toxin; D010434:Pepsin A