Abstract
Early symptoms of food allergy, including diarrhea, are caused by IgE-mediated anaphylactic reactions. To clarify the mechanisms of IgE-mediated anaphylactic reactions in the intestine induced by orally administered antigen, a mouse model was established by s.c. implantation of a murine hybridoma capable of producing monoclonal anti-trinitrophenyl IgE antibody. Morphologic and immunologic changes in the intestine, as well as the effect of the soluble high affinity IgE receptor α chain, were investigated after oral challenge with antigen in this mouse model. Diarrhea, a decrease in s.c. blood flow, an increase in vascular permeability, a substantial increase in serum histamine levels, and noticeable infiltration of mast cells and IgE-bearing cells into the lamina propria were observed around 30 min after antigen challenge. However, these changes were efficiently prevented by pretreatment of the mice with the soluble high affinity IgE receptor α chain. These findings suggested that oral administration of antigen actually induced anaphylactic shock in our mouse model. This reaction was most likely to be mediated by mast cell activation, in response to the IgE-antigen complex, and a soluble form of the high-affinity IgE receptor efficiently prevented this IgE-mediated anaphylactic reaction by trapping free IgE.
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Abbreviations
- FcεRI :
-
high affinity IgE receptor
- HSA :
-
human serum albumin
- PCA :
-
passive cutaneous anaphylaxis
- sFcεRIα :
-
soluble high affinity IgE receptor α-chain
- TNP :
-
trinitrophenyl
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Supported by grants from Morinaga Milk Industry Co, Ltd., Kanagawa, Japan and by a Grant-in-Aid for Scientific Research, The Ministry of Education, Science, Sports and Culture, Japan.
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Ohtsuka, Y., Naito, K., Yamashiro, Y. et al. Induction of Anaphylaxis in Mouse Intestine by Orally Administered Antigen and its Prevention with Soluble High Affinity Receptor for IgE. Pediatr Res 45, 300–305 (1999). https://doi.org/10.1203/00006450-199903000-00002
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DOI: https://doi.org/10.1203/00006450-199903000-00002
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