Role of 4-1BB in immune responses
- PMID: 9826581
- DOI: 10.1006/smim.1998.0157
Role of 4-1BB in immune responses
Abstract
4-1BB is an inducible T cell surface receptor which belongs to the tumor necrosis factor receptor superfamily, a group of cysteine-rich cell-surface molecules. Both human and mouse 4-1BB recently received HLDA nomenclature. Naive T cells lack 4-1BB, which is not only induced upon T cell activation, but also remains on activated T cells. The natural ligand for 4-1BB, 4-1BBL is also induced and is found on activated antigen-presenting cells. Cross-linking of the 4-1BB molecule by agonistic antibody transmits a distinct and potent co-stimulatory signal leading to the activation and differentiation of CD4(+) and CD8(+) cells. 4-1BB transmits signals through the TRAF2-NIK pathway and activates NF-kappaB. Signals relayed through 4-1BB inhibit activation-induced cell death and rescue the immune system during the post-CD28 phase. Antibodies to the 4-1BB molecule can increase GVHD, accelerate the rejection of cardiac allograft and skin transplants, and eradicate established tumors. Interference with the 4-1BB-4-1BBL pathway may be of therapeutic use in the treatment of HIV infection. 4-1BB-deficient mice show dysregulated immune responses and mount elevated Ig responses to T-dependent antigens.
Copyright 1998 Academic Press
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