2024-03-29T15:32:44Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1014082021-12-28T15:53:53Zcom_10261_31891com_10261_2col_10261_31892
00925njm 22002777a 4500
dc
Martos, Gustavo
author
Berin, M. Cecilia
author
2012
[Background]: Oral immunotherapy (OIT) is a promising treatment for food allergy. Studies are needed to elucidate mechanisms of clinical protection and to identify safer and potentially more efficacious methods for desensitizing patients to food allergens. [Objective]: We established a mouse model of OIT to determine how the dose or form of antigen may affect desensitization and to identify mechanisms of desensitization. [Methods]: Increasing doses of egg white or ovomucoid as OIT were administered orally to sensitized mice. The impact of OIT on anaphylaxis elicited by oral allergen challenge was determined. Allergen-specific antibody and cytokine responses and mast cell and basophil activation in response to OIT were measured. Gene expression in the small intestine was studied by microarray and real-time PCR. [Results]: OIT resulted in desensitization but not tolerance of mice to the allergen. OIT did not result in desensitization of systemic effector cells, and protection was localized to the gastrointestinal tract. OIT was associated with significant changes in gene expression in the jejunum, including genes expressed by intestinal epithelial cells. Extensively heated ovomucoid that does not trigger anaphylaxis when given orally to sensitized mice was as efficacious as native ovomucoid in desensitizing mice. [Conclusions]: OIT results in clinical protection against food-induced anaphylaxis through a novel mechanism that is localized to the intestinal mucosa and is associated with significant changes in small intestinal gene expression. Extensively heating egg allergen decreases allergenicity and increases safety while still retaining the ability to induce effective desensitization
Journal of Allergy and Clinical Immunology 129(6): 1579-1587.e1 (2012)
http://hdl.handle.net/10261/101408
10.1016/j.jaci.2012.04.009
http://dx.doi.org/10.13039/501100003339
http://dx.doi.org/10.13039/501100004837
http://dx.doi.org/10.13039/501100000780
22554705
Food allergy
Heated egg allergen
Epithelium
Oral immunotherapy
Oral immunotherapy induces local protective mechanisms in the gastrointestinal mucosa