Human Lymphotoxin  betaR/TNFRSF3 Antibody

Lymphotoxin beta receptor (LT betaR), also known as TNF RIII and TNF R-related protein (TNF Rrp), was originally identified as a transcribed sequence on human chromosome 12p with homology to the TNF receptor superfamily. In the new TNF nomenclature, LT betaR is referred to as TNFRSF3. Human LT betaR cDNA encodes a 435 amino acid (aa) residue type I membrane protein with a putative 30 aa residue signal peptide, a 193 aa residue extracellular domain and a 171 aa residue cytoplasmic domain. The extracellular domain of LT betaR contains four cysteine-rich motif characteristic of the TNF receptor superfamily. The cytoplasmic region of LT betaR share little sequence similarity with other TNF receptor family members, suggesting that different signaling mechanisms may be utilized. LT betaR is expressed in a variety of tissues including visceral and lymphoid tissues. LT betaR is also expressed by cell lines of monocytic, epithelial, and fibroblastic origins but not by T and B lymphocytes. The human and mouse LT betaR share 76% aa sequence homology. The TNF family ligands that have been shown to bind and activate LT betaR include LIGHT (also a ligand for HVEM) and the heterotrimeric lymphotoxin LT alpha1/ beta2 or LT alpha2/ beta1. Depending on the cell type, activation of LT betaR has been shown to induce NF kappaB activation, chemokine production, growth arrest, and apoptosis. In vivo, LT betaR has been shown to play a critical role in controlling cellular immune functions and lymphoid organogenesis.