Background: A model of peanut food allergy has been developed in mice using a simple sensitization protocol leading to a quantitatively measurable allergic response. Methods: C3H/HeJ mice received a single intragastric administration of whole peanut (80 mg) without adjuvant. Two weeks later, intraperitoneal challenge with peanut extract led to a severe anaphylaxis. Results: Anaphylactic reaction was evidenced by vascular leakage, severe clinical symptoms, a drop in body temperature, a decrease in breathing rate and also by increased concentrations of serum mouse mast cell protease-1. Sensitization to peanut was demonstrated by positive skin tests (ear swelling test and intradermal skin testing) and increased peanut-specific IgE levels. Conclusions: Thus, we obtained a model of severe peanut hypersensitivity within 2 weeks following single oral exposure without adjuvant. This model may be useful for further basic and applied studies on peanut allergy.

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