Human 4-1BB/TNFRSF9/CD137 Antibody Summary
Accession # Q07011
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.
Detection of 4-1BB/TNFRSF9/CD137 in Human PHA-treated PBMC by Flow Cytometry. Human PBMC treated with PHA for 48 hr were stained with (A) Rabbit Anti-Human 4-1BB/TNFRSF9/CD137 Monoclonal Antibody (Catalog # MAB8382) or (B) Rabbit IgG control antibody (Catalog # MAB1050) followed by APC-conjugated Goat-anti Rabbit IgG secondary antibody (Catalog # F0111) and Mouse anti-Human CD3 PE-conjugated Monoclonal Antibody (Catalog # FAB100P). View our protocol for Staining Membrane-associated Proteins.
Human 4-1BB/TNFRSF9/CD137 Antibody Stimulates IL-2 Secretion in Human T Cells. Rabbit Anti-Human 4-1BB/TNFRSF9/CD137 Monoclonal Antibody (Catalog # MAB8382) co-stimulates IL-2 secretion in human T cells in the presence of anti-CD3 in a dose-dependent manner, as measured by the Human IL-2 Quantikine ELISA Kit (Catalog # D2050). The ED50 for this effect is typically 1-10 μg/mL.
Preparation and Storage
- 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.
4-1BB, also known as CD137 and TNFRSF9, is an approximately 30 kDa transmembrane glycoprotein in the TNF receptor superfamily. 4-1BB functions in the development and activation of multiple immune cells (1). Mature human 4-1BB consists of a 163 amino acid (aa) extracellular domain (ECD) with four TNFR cysteine-rich repeats, a 27 aa transmembrane segment, and a 42 aa cytoplasmic domain (2, 3). Within the ECD, human 4-1BB shares 60% aa sequence identity with mouse and rat 4-1BB. 4-1BB is expressed as a disulfide-linked homodimer on various populations of activated T cell including CD4+, CD8+, memory CD8+, NKT, and regulatory T cells (4-7) as well as on myeloid and mast cell progenitors, dendritic cells, mast cells, and bacterially infected osteoblasts (8-11). It binds with high affinity to the transmembrane 4-1BB Ligand/TNFSF9 which is expressed on antigen presenting cells and myeloid progenitor cells (3, 8). This interaction costimulates the proliferation, activation, and/or survival of the 4-1BB expressing cell (3-7). It can also enhance the activation-induced cell death of repetitively stimulated T cells (3). Mice lacking 4-1BB show augmented T cell activation, perhaps due to its absence on regulatory T cells (12). 4-1BB can associate with OX40 on activated T cells, forming a complex that responds to either ligand and inhibits Treg and CD8+ T cell proliferation (13). Reverse signaling through 4-1BB Ligand inhibits the development of dendritic cells, B cells, and osteoclasts (8, 11) but supports mature dendritic cell survival and costimulates the proliferation and activation of mast cells (9, 10).
4-1BB activation enhances CD8+ T cell and NK cell mediated anti-tumor immunity (14). It also contributes to the development of inflammation in high fat diet-induced metabolic syndrome (15). Soluble forms of 4-1BB and 4-1BB Ligand circulate at elevated levels in the serum of rheumatoid arthritis and hematologic cancer patients, respectively (16, 17).
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