[Anaphylactic reactions in WZS minipig orally induced by glycinin]

To explore the suitable dosage and observation period of anaphylactic reactions in WZS minipigs induced by glycinin (11S).

Twelve 45-day-old WZS minipigs were randomly divided into three groups (control group, 4% 11S group and 8% 11S group, n = 4), which were respectively orally sensitized (0 - 10d) and orally challenged (16 - 18d, 31d) with diets containing 0%, 4% 11S or 8% 11S soybean proteins to induce anaphylactic reactions. Clinical symptoms, skin prick reactions, serum IgG, serum IgE, histamine, mast cell in the small intestine were observed or measured.

Diarrhea and positive skin prick reactions at different degrees were observed in 11S groups. Compared with the control group, serum IgG, IgE and histamine levels of 4% 11S group at 19d and 32d were significantly higher (P < 0.05), and reached the peak when 11S groups were orally challenged at 19d. The jejunum histamine level was negatively correlated with the mast cell numbers in the jejunum mucosa and sub-mucosa (P < 0.05). Compared with the control, the mast cell number in the jejunum sub-mucosa of 4% 11S group was decreased (P < 0.05).

The WZS minipig allergic reaction orally induced by glycinin could be type I hypersensitivity mediated by IgE, reaction induced by 4% dosage glycinin could be more strong than that of 8% dosage, and stimulating phase could be a suitable observation period for anaphylactic reactions which could be related with the activation of mast cells in the small intestine.