• Tiphaine Bihouée, Gregory Bouchaud, Julie Chesné, David Lair, Camille Rolland-Debord, Faouzi Braza, Marie-Aude Cheminant, Philippe Aubert, Guillaume Mahay, Christine Sagan, Michel Neunlist, Sophie Brouard, Marie Bodinier, and Antoine Magnan.
• INSERM U1087, l'institut du Thorax CHU Nantes, Hôpital Laënnec, 44093, Nantes Cedex 1, France. Tiphaine.BIHOUEE@chu-nantes.fr.
• Resp Res. 2014 Nov 30; 15: 142.

BackgroundAtopic march refers to the typical transition from a food allergy in early childhood to allergic asthma in older children and adults. However the precise interplay of events involving gut, skin and pulmonary inflammation in this process is not completely understood.ObjectivesTo develop a mouse model of mixed food and respiratory allergy mimicking the atopic march and better understand the impact of food allergies on asthma.MethodsFood allergy to ovalbumin (OVA) was induced through intra-peritoneal sensitization and intra-gastric challenge, and/or a respiratory allergy to house dust mite (HDM) was obtained through percutaneous sensitization and intra-nasal challenges with dermatophagoides farinae (Der f) extract. Digestive, respiratory and systemic parameters were analyzed.ResultsOVA-mediated gut allergy was associated with an increase in jejunum permeability, and a worsening of Der f-induced asthma with stronger airway hyperresponsiveness and pulmonary cell infiltration, notably eosinophils. There was overproduction of the pro-eosinophil chemokine RANTES in broncho-alveolar lavages associated with an enhanced Th2 cytokine secretion and increased total and Der f-specific IgE when the two allergies were present. Both AHR and lung inflammation increased after a second pulmonary challenge.ConclusionGut sensitization to OVA amplifies Der f-induced asthma in mice.

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