Cluster of differentiation 14 receptor (CD14) and Toll-like receptor 4 (CD14 and TLR4)

CD14 is a glycosylphosphatidylinositol (GPI)-anchored membrane receptor primarily expressed on myeloid cells, such as monocytes and macrophages, and serves as a co-receptor for TLR4. TLR4, a member of the toll-like receptor family, is a transmembrane protein involved in the detection of pathogen-associated molecular patterns (PAMPs), including LPS from Gram-negative bacteria. The functional interaction between CD14 and TLR4 is essential for LPS recognition: CD14 first binds and presents LPS, facilitating its transfer to the TLR4/MD-2 complex. This triggers dimerization of TLR4 and activates downstream signaling pathways (NF-κB and IRF3), leading to the production of pro-inflammatory cytokines and type I interferons[1][2][3][4]. The duration and magnitude of the inflammatory response are tightly controlled by the internalization and trafficking of the TLR4-CD14 complex[4]. Dysregulation of this pathway is implicated in a range of pathologies, including sepsis, atherosclerosis, chronic inflammation, neurodegeneration, and cancer[1][4]. Note: For structured data, CD14 and TLR4 are best represented as separate targets, each with its own set of identifiers. "CD14/TLR4" denotes their functional partnership, not a unique molecular entity[3][4].

Other names

CD14: Monocyte differentiation antigen CD14TLR4: CD284, Toll-like receptor 4CD14/TLR4 complex: Sometimes referred to in literature as "CD14/TLR4 signaling axis" or "CD14-TLR4 pathway"

Competitive inhibition (Eritoran acts as a lipid A analog to block LPS-induced TLR4 signaling) Antibody-mediated blockade (e.g., UT12 disrupts TLR4/MD2 complex dimerization or promotes endocytosis) Inhibition of downstream pro-inflammatory signaling (NF-κB, IRF3 pathways)