Anti-Human 4-1BB Purified No Carrier Protein (Clone: 145501)

4-1BB (CD137) is a 39 kD transmembrane protein that is a member of the tumor necrosis factor (TNF) receptor family and is a co-stimulatory molecule that plays a role in T-cell-mediated proliferative response. When binding its ligand, CD137 provides costimulatory signals to both CD4 and CD8 T cells via the activation of NF-B, c-Jun and p38 downstream pathways. Crosslinking of CD137 boosts T cell proliferation, IL-2 secretion, survival and cytolytic activity. Furthermore, it can increase immune activity to eliminate tumors in mice. Agonistic anti-CD137 antibodies have been reported to stimulate a more intense immune system attack on cancers.