The ‘Ethereal’ nature of TLR4 agonism and antagonism in the AGP class of lipid A mimetics
作者:Hélène G. Bazin、Tim J. Murray、William S. Bowen、Afsaneh Mozaffarian、Steven P. Fling、Laura S. Bess、Mark T. Livesay、Jeffrey S. Arnold、Craig L. Johnson、Kendal T. Ryter、Christopher W. Cluff、Jay T. Evans、David A. Johnson
DOI:10.1016/j.bmcl.2008.09.060
日期:2008.10
To overcome the chemical and metabolic instability of the secondary fatty acyl residues in the AGP class of lipid A mimetics, the secondary ether lipid analogs of the potent TLR4 agonist CRX-527 (2) and TLR4 antagonist CRX-526 (3) were synthesized and evaluated along with their ester counterparts for agonist/antagonist activity in both in vitro and in vivo models. Like CRX-527, the secondary ether lipid 4 showed potent agonist activity in both murine and human models. Ether lipid 5, on the other hand, showed potent TLR4 antagonist activity similar to CRX-526 in human cell assays, but did not display any antagonist activity in murine models and, in fact, was weakly agonistic. Glycolipids 2, 4, and 5 were synthesized via a new highly convergent method utilizing a common advanced intermediate strategy. A new method for preparing (R)-3-alkyloxytetradecanoic acids, a key component of ether lipids 4 and 5, is also described. (C) 2008 Elsevier Ltd. All rights reserved.