CD74 Antibody (Bu45) [FITC]

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Product Details

Summary
Product Discontinued
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Order Details


    • Catalog Number
      NB100-64013
    • Availability
      Product Discontinued

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CD74 Antibody (Bu45) [FITC] Summary

Immunogen
B lymphoblastoid cell line HFB1
Localization
Cell surface and paranuclear globular
Marker
B-Cell Marker
Specificity
Recognizes proteins of 33, 35 and 41kDa, which are identified as various isoforms of CD74. Its 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, and 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. Anti-CD74 stains predominantly germinal center lymphocytes and B-cell lymphomas, but rarely T-cell lymphomas. Anti-CD74 has been shown to be useful in differentiating atypical fibroxanthoma (-) from malignant fibrous histiocytoma (+).
Isotype
IgG1 Kappa
Clonality
Monoclonal
Host
Mouse
Gene
CD74
Purity
Protein G purified
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Applications/Dilutions

Dilutions
  • Flow Cytometry Neat-1:5
Application Notes
Membrane permeabilisation may enhance CD74 staining in Flow Cytometry. The epitope recognised by this antibody is reported to be sensitive to formaldehyde fixation and tissue processing. The use of acetone fixation for frozen sections is recommended. This product contains sodium azide, removal by dialysis is recommended prior to use in functional assays.

Packaging, Storage & Formulations

Storage
Store at 4C short term. Aliquot and store at -20C long term. Avoid freeze-thaw cycles.
Buffer
PBS (pH 7.4) and 1.0% BSA
Preservative
0.09% Sodium Azide
Concentration
0.1 mg/ml
Purity
Protein G purified

Alternate Names for CD74 Antibody (Bu45) [FITC]

  • CD74 antigen (invariant polypeptide of major histocompatibility complex, classII antigen-associated)
  • CD74 antigen
  • CD74 molecule, major histocompatibility complex, class II invariant chain
  • CD74
  • CLIP
  • DHLAG
  • DHLAGgamma chain of class II antigens
  • HLA class II histocompatibility antigen gamma chain
  • HLADG
  • HLA-DR antigens-associated invariant chain
  • HLA-DR-gamma
  • Ia antigen-associated invariant chain
  • Ia-associated invariant chain
  • Ia-gamma
  • Ii
  • INVG34
  • MHC HLA-DR gamma chain
  • p33

Background

CD74, also known as the MHC class II associated invariant chain (Ii), 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. CD74 is produced in molar excess over MHC class II and some of this is expressed by an unknown pathway on the cell surface independent of or in association with MHC class II molecules. The half life of CD74 on the cell surface is only 3 to 4 min after which it is internalized. It has been proposed that cell surface CD74 binds MHC class II molecules which have lost their antigenic peptide leading to internalization and reloading with antigenic peptide. The transport route of class II alpha/beta/Ii complexes is regulated selectively by two forms of CD74 (p33 and p35) which are generated by the use of alternative translation initiation sites. 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 together, with many epithelial cells. CD74 may exist in different isoforms ranging in size from 33 to 41kDa, depending on genetic splicing.

Limitations

This product is for research use only and is not approved for use in humans or in clinical diagnosis. Primary Antibodies are guaranteed for 1 year from date of receipt.

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Blogs on CD74.

CD74 - a central player in antigen presentation by MHC class II
Cluster of differentiation 74 (CD74) is an important integral membrane protein that serves as a chaperone for MHC class II molecules. CD74, also known as the invariant chain or Ii, is needed for the proper folding and trafficking of MHC class II in...  Read full blog post.

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Bioinformatics

Gene Symbol CD74
Entrez