This antibody recognizes proteins of 33, 35 and 41kDa, which are identified as various isoforms of CD74. The CD74 antibody epitope is localized in the extracellular domain of CD74.CD74 is a type II transmembrane protein which binds to the peptide binding groove of newly synthesized MHC class II alpha/beta heterodimers and prevents their premature association with endogenous polypeptides. The CD74 molecule plays a critical role in the presentation of peptides, by the MHC class II antigens, to CD4 positive lymphocytes. CD74 is expressed on MHC class II positive cells including B cells, a subset of activated T cells, monocytes, dendritic cells and by various types of carcinomas. CD74 is expressed primarily by antigen presenting cells, such as B-lymphocytes (from before the pre-B cell stage to before the plasma cell stage), macrophages, and monocytes, and many epithelial cells. CD74 antibody stains predominantly germinal center lymphocytes and B-cell lymphomas, but rarely T-cell lymphomas. CD74 antibody has been shown to be useful in differentiating atypical fibroxanthoma (-) from malignant fibrous histiocytoma (+).

The concentration stated for each application is a general starting point.Variations in protocols, secondaries and substrates may require the antibody to be titered up or down for optimal performance.

The B lymphoblastoid cell line HFB1 was used as the immunogen for this antibody.

Store the CD74 antibody at 2-8oC (with azide) or aliquot and store at -20oC or colder (without azide).

CLIP, DHLAG, Gamma chain of class II antigens, HLA class II histocompatibility antigen gamma chain, HLA-DR antigens-associated invariant chain, HLADR-gamma (HLADG), Ia antigen-associated invariant chain, la-gamma, Major histocompatibility complex class II invariant chain, MHC HLA-DR gamma chain, CD74 antibody