Section 39
Chapter 38,978

Role of the eosinophil in the allergic reactions. I. EDI-an eosinophil-derived inhibitor of histamine release

Hubscher, T.

Journal of Immunology 114(4): 1379-1388


ISSN/ISBN: 0022-1767
PMID: 46900
Accession: 038977126

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An inhibitor of histamine release was found to be associated with the human eosinophilic leukocyte. This eosinophil-derived inhibitor (EDI) was released from eosinophil-rich fractions upon sonication or interaction with immune reactants (specific allergens or anti-IgE). EDI was found to exert its inhibitory action at the target cell level by increasing the intracellular levels of cyclic-AMP. Preliminary electron microscopic studies show the presence of IgE on the eosinophilic leukocyte and it is suggested that the allergen or anti-IgE-induced release of EDI might be due to a direct interaction of these immune reactants with the eosinophil-bound IgE antibody. The results also suggest that by virtue of liberating a histamine release inhibitor such as EDI, the eopsinophil assumes a modulating role in the allergic inflammatory reaction.

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