CD23 Monoclonal Antibody

The CD23 antigen is the low affinity IgE Fc receptor, which is a 49 kDa protein with 38 and 28 kDa fragments. It is expressed on most mature, conventional B cells (but not on peritoneal CD5+ B cells), and can also be found on the surface of T cells, macrophages, platelets and EBV transformed B lymphoblasts. Expression of CD23 has been detected in neoplastic cells from cases of B cell chronic Lymphocytic leukemia. CD23 is expressed by B cells in the follicular mantle but not by proliferating germinal centre cells. CD23 is also expressed by eosinophils. CD23 is distinct from the high affinity IgE receptors found on basophils and mast cells, which mediate allergic reactions. The low affinity receptors are thought to play a role in isotype specific immunoregulation. The regulation of CD23 surface expression appears to be integral with the complex IgE system, which involves interactions of cells, cytokines, antibodies and regulatory factors. CD23 has been described as a “membrane bound cytokine, " in that the soluble cleavage products of CD23 are themselves able to act as cytokines in vitro.

Fc EpsilonR II; FcεRII; Blast 2; Blast2; C type lectin domain family 4 member J; C-type lectin domain family 4, member J; CD 23; CD 23A; CD23 antigen; CD23A; CLEC 4J; CLEC4J; Fc epsilon RII; Fc fragment of IgE low affinity II receptor for; Fc fragment of IgE, low affinity II, receptor for (CD23) ; Fc of IgE, low affinity II, receptor for (CD23) ; Fc receptor IgE low affinity II alpha polypeptide; Fc receptor, IgE, low affinity II, alpha polypeptide, isoform CRA_a; FCE 2; FCE2; FCER 2; FCER2; FCER2A; IgE binding factor; IgE receptor lymphocyte; IgE-binding factor; IGEBF; Immunoglobulin E binding factor; Immunoglobulin E receptor, low affinity II; Low affinity immunoglobulin epsilon Fc receptor; Low affinity immunoglobulin epsilon Fc receptor membrane bound form; Low affinity immunoglobulin epsilon Fc receptor soluble form; Ly-42; Ly42; Lymphocyte antigen CD23; Lymphocyte IgE receptor; MGC93219.