Coreceptor for bacterial lipopolysaccharide (PubMed:1698311, PubMed:23264655). In concert with LBP, binds to monomeric lipopolysaccharide and delivers it to the LY96/TLR4 complex, thereby mediating the innate immune response to bacterial lipopolysaccharide (LPS) (PubMed:20133493, PubMed:23264655, PubMed:22265692). Acts via MyD88, TIRAP and TRAF6, leading to NF-kappa-B activation, cytokine secretion and the inflammatory response (PubMed:8612135). Acts as a coreceptor for TLR2:TLR6 heterodimer in response to diacylated lipopeptides and for TLR2:TLR1 heterodimer in response to triacylated lipopeptides, these clusters trigger signaling from the cell surface and subsequently are targeted to the Golgi in a lipid-raft dependent pathway (PubMed:16880211). Binds electronegative LDL (LDL(-)) and mediates the cytokine release induced by LDL(-) (PubMed:23880187). Interacts with LPS-bound LPB (PubMed:1698311, PubMed:23264655). Belongs to the lipopolysaccharide (LPS) receptor, a multi-protein complex containing at least CD14, LY96 and TLR4 (PubMed:11274165). Interacts with LPAR1 (By similarity). Interacts with the TLR2:TLR6 or TLR2:TLR1 heterodimers; upon interaction with ligands such as diacylated lipopeptides and triacylated lipopeptides, respectively (PubMed:16880211). Interacts with MYO18A (PubMed:25965346). Interacts with FSTL1 (PubMed:22265692). Secreted forms may arise by cleavage of the GPI anchor. Detected on macrophages (at protein level) (PubMed:1698311). Expressed strongly on the surface of monocytes and weakly on the surface of granulocytes; also expressed by most tissue macrophages. The expression in monocytes is highly induced by 27-hydroxycholesterol, priming monocytes/macrophages such that LPS-mediated inflammatory reaction is accelerated. Secretion of soluble CD14 is also enhanced. The C-terminal leucine-rich repeat (LRR) region is required for responses to smooth LPS. N- and O- glycosylated. O-glycosylated with a core 1 or possibly core 8 glycan. CD14 entry