Synonyms
High affinity IgE receptor/FCeRI; Low affinity IgE receptor/FcεRIIb/CD23
Definition
Cell surface receptor that specifically binds IgE.
IgE Receptors
There are two Fc receptors that specifically bind IgE through interaction with its Fc region: the high-affinity IgE receptor FCεRI and the low-affinity IgE receptor FCεRII, also known as CD23. Furthermore a protein called galectin-3 which is primarily secreted from macrophages can bind IgE as well as FcεRI. Galectin 3 is a 30 kDa galactoside-binding lectin that can form pentamers in complex with oligosaccharides which are present on IgE and FcεRI. As a result, galectin-3 can activate mast cells and basophils by cross-linking FcεRI directly or indirectly through receptor-bound IgE molecules (Gould and Sutton 2008).
High-Affinity IgE Receptor
FcεRI is expressed on mast cells, basophils, epidermal Langerhans’ cells, dendritic cells (DC), monocytes, and, under certain conditions, intestinal epithelial cells. The human FcεRI can be...
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van de Veen, W. (2014). IgE Receptor. In: Mackay, I.R., Rose, N.R., Ledford, D.K., Lockey, R.F. (eds) Encyclopedia of Medical Immunology. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-9194-1_75
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