Tumor necrosis factor signaling pathway components

The tumor necrosis factor (TNF) signaling pathway consists of the cytokine TNFα as a principal effector, its primary receptors—tumor necrosis factor receptor 1 (TNFR1) and tumor necrosis factor receptor 2 (TNFR2)—and an extensive network of intracellular signaling intermediates[1][2][3][5][7]. TNFα acts primarily as a pro-inflammatory cytokine and induces a wide array of biological effects, including cell survival, apoptosis, and necroptosis, by activating distinct downstream pathways (notably NF-κB and MAPK). TNFR1, broadly expressed, mediates most apoptotic and pro-inflammatory effects; TNFR2, with expression restricted largely to immune and endothelial cells, primarily supports cell survival and immune modulation[1][5]. The pathway is implicated in the pathogenesis of numerous diseases, including autoimmune disorders, chronic inflammatory diseases, cancer, and certain infections, and is the target of several approved biologic therapies[2][4][7]. Pathway components include both membrane-associated and soluble proteins, with therapeutic agents targeting either the ligand (TNFα), its receptors, or downstream transducers to modify disease activity.

Other names

Tumor necrosis factor pathway componentsTNF pathway proteinsTNF signaling networkTumor necrosis factor-alpha signaling elements

TNF neutralization (e.g., by monoclonal antibodies or receptor decoys) Selective inhibition of TNFR1 (antagonists) Selective activation of TNFR2 (agonists) Inhibition of signal transduction intermediates (e.g., kinase inhibitors)[2][4][7]