An intestinal galactose-specific lectin mediates the binding of murine IgE to mouse intestinal epithelial cells

Article Article scientifique Article An intestinal galactose-specific lectin mediates the binding of murine IgE to mouse intestinal epithelial cells eng 1992 author Brassart Dominique author Kolodziejczyk Eric author Granato Dominique author Woltz Arlette author Pavillard Michel 709207 author Perotti Fabienne author Frigeri Luciano G. author Liu Fu-Tong author Borel Yves author Neeser Jean-Richard 25568 393-399 10.1111/j.1432-1033.1992.tb16563.x 1735427 0014-2956 A number of lactose-binding lectins have recently been identified in the rat and mouse intestine, one of which corresponds to the C-terminal domain of IgE-binding proteins, originally identified in rat basophilic leukemia (RBL) cells and mouse 3T3 fibroblasts. In the present report, we describe the affinity purification of a rat intestinal lactose-specific lectin which binds murine IgE antibodies. This binding most likely occurs via the immunoglobulin carbohydrate chains, as it is inhibited by lactose. This intestinal lectin molecule is also immunologically related to the previously described IgE-binding protein (epsilon BP) isolated from RBL cells, since it is recognized by antibodies raised against recombinant epsilon BP. This intestinal form of epsilon BP has a molecular mass of 17.5 kDa, which is much lower than that of its RBL cell analogue (31 kDa). The attachment of IgE to the mouse intestinal epithelium was demonstrated by immunohistochemistry, along with the presence of a corresponding mouse intestinal epsilon BP. The carbohydrate-dependent nature of this attachment was established by demonstrating that IgE binding to mouse epithelium was specifically abolished by lactose (4 mM) and by a blood-group-A-active tetrasaccharide (0.2 mM), but not by mannose (10 mM). Finally, the association of IgE with the mouse intestinal epithelium was prevented by competition with the purified IgE-binding lectin isolated from rat intestine. Although the physiological function of this intestinal protein is still unknown, the finding that IgE binds to a lectin in the intestinal epithelium pinpoints a possible novel mechanism for the regulation of IgE-mediated disorders, such as food allergy. 3T3 Cells Animals Binding Sites Antibody Blotting Western Chromatography Affinity Duodenum/metabolism Electrophoresis Polyacrylamide Gel Galactose/metabolism Immunoglobulin E/metabolism Immunohistochemistry Intestinal Mucosa/metabolism Lectins/metabolism Mice Rats true European journal of biochemistry 203 3 2fee73ab-dccc-4b59-a97e-38c522e6f2a0 Article (Published version) Restricted D.Brassart_2.pdf 820385 application/pdf restrictedAccess

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An intestinal galactose-specific lectin mediates the binding of murine IgE to mouse intestinal epithelial cells	European journal of biochemistry			1992	552	1

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Pavillard, Michel