The 7G3 monoclonal antibody specifically recognizes human CD123, the 70 kDa IL-3 Receptor α (IL-3Rα) chain
CD123 associates with CD131, the 120-140 kDa Common β chain to form the IL-3 Receptor Complex
CD131 is shared with the receptors for interleukins IL-5 and GM-CSF
IL-3Rα is expressed on hematopoietic progenitors and plays an important role in hematopoietic progenitor cell growth and differentiation
It is also expressed by mast cells, macrophages and a CD5+ B cell subset
This antibody has been reported to block the binding of 125I-IL-3 to high and low affinity IL-3 receptors
In functional experiments, this antibody was found to inhibit acute myeloid leukemia cell proliferation, basophil histamine release, endothelial cell-mediated IL-8 secretion, and neutrophil transmigration
This antibody has been reported to be useful for immunoprecipitation, Western blot and immunofluorescent staining for flow cytometry
At the Fifth HLDA Workshop, the human IL-3 receptor was designated CD123.