TNF and IL-6 mediated cytokine signaling (TNF/IL-6 signaling)

TNF and IL-6 mediated cytokine signaling refers to the integrated biological pathways driven by Tumor Necrosis Factor (TNF) and Interleukin-6 (IL-6), two pivotal pro-inflammatory cytokines in the human immune system. TNF-alpha primarily signals through its receptors, TNFR1 and TNFR2, to activate the NF-κB and MAPK pathways, which regulate cell survival, inflammation, and programmed cell death (StatPearls: Tumor Necrosis Factor). Concurrently, IL-6 signals through a receptor complex consisting of the IL-6 receptor (IL-6R) and the signal-transducing protein gp130, predominantly activating the JAK/STAT3 signaling cascade (UniProt: IL6). This pathway is essential for the induction of the acute phase response, the differentiation of B-cells into plasma cells, and the regulation of T-cell subsets (PubMed: Tanaka et al., 2014). Dysregulation of the TNF and IL-6 signaling axis is a central driver in the pathogenesis of numerous autoimmune and chronic inflammatory diseases, such as rheumatoid arthritis and inflammatory bowel disease (PubMed: McInnes & Schett, 2011). Therapeutic strategies targeting this axis include monoclonal antibodies that neutralize the cytokines or block their receptors, effectively dampening the systemic inflammatory response (PubChem: Adalimumab, Tocilizumab). However, such therapies carry significant risks, including increased susceptibility to opportunistic infections and potential hematological abnormalities (PubMed: Singh et al., 2011).

Other names

TNF-alpha and IL-6 signaling pathwayPro-inflammatory cytokine signaling axisTumor Necrosis Factor and Interleukin-6 signalingTNF/IL-6 axis

Drugs targeting this signaling axis work by either directly neutralizing the ligands (TNF-alpha or IL-6) or by blocking their respective receptors (TNFR or IL-6R) to prevent the activation of downstream pro-inflammatory cascades such as NF-kB and JAK/STAT. This inhibition reduces the production of inflammatory mediators and dampens the systemic immune response.