Tumor necrosis factor alpha pathway (TNF-α pathway)

The tumor necrosis factor alpha pathway is a central inflammatory signaling cascade initiated by the cytokine tumor necrosis factor alpha binding to its two primary cell surface receptors—tumor necrosis factor receptor type 1 (TNFR1) and type 2 (TNFR2). Activation triggers multiple intracellular cascades including NF-kappaB activation for cell survival/inflammation; MAPK/JNK pathways for stress responses; caspase-mediated apoptosis; and can also lead to programmed forms of cell death like apoptosis or necroptosis depending on cellular context. This pleiotropic system regulates immune defense against infection but also drives chronic inflammation in autoimmune diseases when dysregulated. Therapeutic blockade has revolutionized treatment for several inflammatory disorders but carries significant risks due to broad immunosuppression.

Other names

TNF-alpha signalingTNF signalingTumor necrosis factor α pathwayTNF superfamily signaling

Drugs targeting this molecule/pathway act primarily by neutralizing soluble and/or membrane-bound TNF-alpha to prevent activation of downstream pro-inflammatory pathways via its receptors. Some drugs are monoclonal antibodies against TNF; others are soluble decoy receptors that sequester circulating cytokine.