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E5564, a lipid A analogue, is a potent antagonist of lipopolysaccharide (LPS). Clinically, E5564 was developed as a possible therapy for treatment of sepsis and septic shock. Surface plasmon resonance (SPR) analysis indicates that E5564 binds to LPS binding protein (LBP), in a manner similar to LPS. Gel-filtration radioactive chromatograms of [ 14 C]-E5564 in plasma revealed that E5564 initially distributes to the lipoprotein fractions, separated from high-density lipoprotein (HDL); the bound fraction is then released and binds to HDL. Similar results were obtained by heparin-manganese precipitation. At doses of E5564 relevant to its clinical use ( i.e. 6 µg/ml), antibodies against LBP did not influence either the distribution of E5564 to non-HDL lipoprotein fractions or the transfer of E5564 from non-HDLs to HDL. Under these conditions, transfer of E5564 to HDL occurs similarly in the plasma of LBP knockout (KO) mice as in the plasma from wild-type mice. In addition, plasma clearance of E5564 in LBP KO mice is similar to that of wild-type mice. Thus, LBP binds E5564 in a manner similar to LPS, but does not play a role in E5564 redistribution/binding to lipoprotein and plasma clearance.

LPS binding protein does not participate in the pharmacokinetics of E5564