A WZS miniature swine food hypersensitivity model orally induced by soybean beta-conglycinin / 中华预防医学杂志

ABSTRACT

<p><b>OBJECTIVE</b>To establish WZS miniature swine model of beta-conglycinin (7 S) allergy for evaluating the potential allergenicity of genetically modified food.</p><p><b>METHODS</b>Twelve 45-day-old WZS miniature swines from three litters were randomly divided into three groups (control group; 4% 7 S group and 8% 7 S group, n = 4), which were respectively gastric sensitized (day 0 - 10) and oral challenged (day 6 - 18, 31) to induce anaphylactic reactions. Clinical symptoms, skin prick reactions were recorded. At day 10, 19 and 32, serum IgG, IgE, histamine and cytokines levels were measured by ELISA.</p><p><b>RESULTS</b>Diarrhea at different degrees were observed in 4% and 8% 7 S groups. The skin erythema reactions in grade "-", "+/-", "+", "++" of control group respectively were 2/4, 2/4, 0/4, 0/4, of 4% 7 S group were 0/4, 0/4, 2/4, 2/4 and of 8% 7 S group were 0/4, 0/4, 1/4, 3/4. The serum IgE and histamine levels of day 11, 19 and 32 were all significantly and positively correlated (Pearson coefficients = 1, P = 0.000). The serum IgG, IgE and histamine levels all reached the peak after 7 S groups were oral challenged at day 19.Compared with the control group, serum IgG (lg IgG: 2.95 +/- 0.31 vs 2.29 +/- 0.25, t = 3.19, P = 0.011), IgE (lg IgE: 2.45 +/- 0.30 vs 1.77 +/- 0.23, t = 3.31, P = 0.009) and histamine levels(lg histamine:2.13 +/- 0.30 vs 1.45 +/- 0.23, t = 3.34, P = 0.009) of 4% 7 S group at day 19 were all significantly higher, while the serum IFN-gamma content [(35.78 +/- 6.42) pg/ml vs (51.10 +/- 9.67) pg/ml, t = -2.33, P = 0.045] of 4%7 S group was significantly lower.</p><p><b>CONCLUSION</b>The WZS miniature swine model orally induced by soybean beta-conglycinin is type I hypersensitivity mediated by IgE, which can be used to predict the potential allergenicity of genetically modified food.</p>