Fc epsilon receptor 1 (Fc epsilon RI) is a high-affinity receptor for the Fc region of immunoglobulin E (IgE), an antibody isotope involved in allergies. The antigens of allergens bind to IgE antibodies, which then interact with Fc epsilon RIs on the surface of mast cells. This activates the mast cells and results in degranulation, a process by which preformed granules containing histamine, proteoglycans, and serine proteases, are released. Activated mast cells also synthesize and secrete lipid-derived mediators (such as prostaglandins, leukotrienes, and platelet-activating factor) and cytokines (notably tumor necrosis factor-alpha, interleukin-4, and interleukin-5). The release of these compounds results in the inflammatory response.

Fc Epsilon Receptor I Signaling in Mast Cells References