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- W1970691845 abstract "L'allergie alimentaire ou hypersensibilité alimentaire (HSA) est une réaction d'intolérance aux aliments dont le mécanisme est immunologique. Le facteur d'initiation de l'HSA serait une rupture de la barrière immunitaire muqueuse avec abrogation de la tolérance immunitaire. L'HSA est le plus souvent de type immédiate, liée à une activation mastocytaire dépendante des immunoglobulines E. Ses manifestations digestives ont été étudiées sur un modèle expérimental de rat sensibilisé à l'ovalbumine. L'introduction de l'antigène dans la lumière gastrique ou jéjunale d'animaux sensibilisés entraîne des modifications de l'absorption, de la sécrétion et de la motricité du segment digestif perfusé. Chez l'homme les données expérimentales sont rares. L'HSA immédiate s'exprime par des symptômes digestifs variés et non spécifiques. Sa participation aux troubles fonctionnels intestinaux est discutée. L'HSA de type retardée serait beaucoup plus rare. La gastroentérite à éosinophiles pourrait en être une manifestation. En pratique clinique, il faut exiger des critères diagnostiques rigoureux avant de porter le diagnostic d'HSA. L'examen de référence est actuellement le test de provocation en double aveugle. Food allergy, synonymous with food hypersensitivity (FHS), is defined as an immunologically-mediated adverse reaction to food. Initiation of FHS could result from a break in the immune mucosal barrier with abrogation of oral tolerance. Food hypersensitivity is mostly due to immediate-type reaction involving IgE-dependent mastocytes activation. Changes in intestinal function and structure have been mainly studies in an animal model of rat sensitized to egg albumin. Intraluminal antigen challenge resulted in abnormalities of gut absorption, secretion and motility in sensitized rats. In man, experimental data are scarce. Gastrointestinal manifestations of immediate FHS are varying and unspecific. A role for FHS in irritable bowel syndrome is debated. Participation of delayed-type FHS to digestive diseases is still questionable, but eosinophilic gastroenteritis might be an example. In clinical practice, diagnosis of FHS demands rigorous criteria. Double blind placebo-controlled food challenge has eventually proved to be the « gold standardtest for FHS diagnosis." @default.
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- W1970691845 date "1991-07-01" @default.
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- W1970691845 title "Manifestations digestives des allergies alimentaires chez l'adulte" @default.
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