Human JAM-B/VE-JAM Antibody

  
  • Species Reactivity
    Human
  • Specificity
    Detects human JAM‑B/VE-JAM in direct ELISAs and Western blots.
  • Source
    Monoclonal Mouse IgG2B Clone # 156624
  • Purification
    Protein A or G purified from hybridoma culture supernatant
  • Immunogen
    Mouse myeloma cell line NS0-derived recombinant human JAM‑B/VE-JAM
    Phe29-Asn236 (predicted)
    Accession # P57087
  • Formulation
    Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose. *Small pack size (SP) is supplied as a 0.2 µm filtered solution in PBS.
  • Endotoxin Level
    <0.10 EU per 1 μg of the antibody by the LAL method.
  • Label
    Unconjugated
Applications
  •  
    Recommended
    Concentration
    Sample
  • Western Blot
    1 µg/mL
    Recombinant Human JAM-B/VE-JAM Fc Chimera (Catalog # 1074-VJ)
  • Neutralization
    Measured by its ability to neutralize JAM‑B/VE‑JAM-mediated adhesion of the J45.01 human acute lymphoblastic leukemia T lymphocyte cell line. Fong, S. et al. (2002) J. Immunol. 168:1618. The Neutralization Dose (ND50) is typically 0.6-3.0 µg/mL in the presence of 0.2 µg/mL Recombinant Human JAM‑B/VE‑JAM Fc Chimera.
Please Note: Optimal dilutions should be determined by each laboratory for each application. General Protocols are available in the Technical Information section on our website.
Data Examples
Cell Adhesion Mediated by JAM‑B/VE‑JAM and Neutral­ization by Human JAM‑B/
VE‑JAM Antibody.
Recombinant Human JAM‑B/VE‑JAM Fc Chimera (Catalog # 1074-VJ), immobilized onto a microplate previously coated with Goat Anti-Human IgG Fc (Catalog # G-102-C), supports the adhesion of the J45.01 human acute lymphoblastic leukemia T lymphocyte cell line in a dose-dependent manner (orange line), as measured by endogenous cellular lysosomal acid phosphatase activity. Adhesion elicited by Recombinant Human JAM‑B/VE‑JAM Fc Chimera (0.2 µg/mL) is neutralized (green line) by increasing concentrations of Mouse Anti-Human JAM-B/
VE-JAM Monoclonal Antibody (Catalog # MAB10741). The ND50 is typically 0.6-3.0 µg/mL.
Preparation and Storage
  • Reconstitution
    Reconstitute at 0.5 mg/mL in sterile PBS.
  • Shipping
    The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below. *Small pack size (SP) is shipped with polar packs. Upon receipt, store it immediately at -20 to -70 °C
  • Stability & Storage
    Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
    • 12 months from date of receipt, -20 to -70 °C as supplied.
    • 1 month, 2 to 8 °C under sterile conditions after reconstitution.
    • 6 months, -20 to -70 °C under sterile conditions after reconstitution.
Background: JAM-B/VE-JAM

The family of juctional adhesion molecules (JAM), comprising at least three members, are type I transmembrane receptors belonging to the immunoglobulin (Ig) superfamily (1, 2). These proteins are localized in the tight junctions between endothelial cells or epithelial cells. Some family members are also found on blood leukocytes and platelets. JAM-B, alternatively named vascular endothelial JAM (VE-JAM), is expressed prominently on high endothelial venules of lymphoid organs where it is localized to the intercellular boundaries of high endothelial cells. It is also expressed on the endothelium of a variety of non-lymphoid organs, especially the heart and placenta (3, 5). Human JAM-B cDNA predicts a 298 amino acid (aa) precursor protein with a putative 28 aa signal peptide, a 209 aa extracellular region containing two Ig domains, a 23 aa transmembrane domain and a 38 aa cytoplasmic domain containing a PDZ-binding motif and a PKC phosphorylation site. Human JAM-B shares approximately 79% aa sequence homology with its mouse homologue. It also shares approximately 35% aa sequence homology with human JAM-A or JAM-C. JAM-B exhibits homotypic interactions, as well as heterotypic interactions with JAM-C, but not JAM-A (4, 5, 7). It is also a ligand for the Integrin alpha 4 beta 1. However, the JAM-B/ alpha 4 beta 1 interaction is facilitated only after prior adhesion of JAM-B to JAM-C (6). Through its heterotypic interactions with JAM-C, JAM-B is an adhesive ligand for T, NK, and dendritic cells, and may play a role in regulating leukocyte transmigration (5).

The nomenclature used for the JAM family proteins is confusing. VE-JAM has been referred in the literature variously as JAM-B or JAM-3. Until further clarification, R&D Systems has adopted the nomenclature where both mouse and human VE-JAM are referred to as JAM-B.

  • References:
    1. Chavakis, T. et al. (2003) Thromb. Haemost. 89:13.
    2. Aurand-Lions, M. et al. (2001) Blood 98:3699.
    3. Palmeri, A. et al. (2000) J. Biol. Chem. 275:19139.
    4. Cunnigham, S. et al. (2000) J. Biol. Chem. 275:34750.
    5. Liang, T. et al. (2002) J. Immunol. 168:1618.
    6. Cunningham, A. et al. (2002) J Biol. Chem. 277:27589.
    7. Arrate, M. et al. (2001) J. Biol. Chem. 276:45826.
  • Long Name:
    Junctional Adhesion Molecule B
  • Entrez Gene IDs:
    58494 (Human); 67374 (Mouse)
  • Alternate Names:
    C21orf43; CD322 antigen; CD322; JAM2; JAMB; JAM-B; JAM-BJAM-IT/VE-JAM; junctional adhesion molecule 2JAM-2; junctional adhesion molecule B; PRO245; Vascular endothelial junction-associated molecule; VE-JAM; VE-JAMVEJAMCD322
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