Toll-like receptor 4 and Nuclear factor kappa-B signaling pathway (TLR4/NF-κB pathway)

The Toll-like receptor 4 (TLR4) and Nuclear factor kappa-B (NF-κB) signaling pathway is a fundamental immune axis that mediates the body's response to microbial invasion and sterile tissue injury [1][2]. TLR4, a transmembrane pattern recognition receptor, identifies lipopolysaccharides from Gram-negative bacteria and various endogenous danger signals, initiating an intracellular signaling cascade [3]. This cascade culminates in the activation of the NF-κB transcription factor, which translocates to the nucleus to drive the expression of pro-inflammatory cytokines like TNF-α, IL-1β, and IL-6 [1][4]. While essential for host defense, chronic or excessive activation of this pathway is linked to the pathogenesis of sepsis, autoimmune disorders, and chronic inflammatory conditions [2][5]. Pharmacological intervention focuses on inhibiting various nodes of this pathway, including TLR4 antagonism and NF-κB inhibition, to reduce systemic inflammation and prevent tissue damage [4][6]. This entry is classified as incorrect because it describes a complex signaling cascade involving multiple distinct molecular targets rather than a single protein or receptor.

Other names

Pro-inflammatory cytokine and NF-κB/TLR4 signaling pathwaysTLR4-NF-kappaB axisLPS-induced inflammatory signalingMyD88-dependent signaling pathwayTRIF-dependent signaling pathway

Inhibition of TLR4-ligand binding, blockade of the IKK complex to prevent IκB degradation, inhibition of the proteasome to prevent NF-κB activation, or direct neutralization of downstream pro-inflammatory cytokines such as TNF-α, IL-1β, and IL-6.