Synthetic tetra-acylated derivatives of lipid A from Porphyromonas gingivalis are antagonists of human TLR4
作者:Yanghui Zhang、Jidnyasa Gaekwad、Margreet A. Wolfert、Geert-Jan Boons
DOI:10.1039/b809090d
日期:——
Tetra-acylated lipid As derived from Porphyromonas gingivalis LPS have been synthesized using a key disaccharide intermediate functionalized with levulinate (Lev), allyloxycarbonate (Alloc) and anomeric dimethylthexylsilyl (TDS) as orthogonal protecting groups and 9-fluorenylmethoxycarbamate (Fmoc) and azido as amino protecting groups. Furthermore, an efficient cross-metathesis has been employed for the preparation of the unusual branched R-(3)-hydroxy-13-methyltetradecanic acid and (R)-3-hexadecanoyloxy-15-methylhexadecanoic acid of P. gingivalislipid A. Biological studies have shown that the synthetic lipid As cannot activate human and mouse TLR2 and TLR4 to produce cytokines. However, it has been found that the compounds are potent antagonist of cytokine secretion by human monocytic cells induced by enteric LPS.
来自牙龈卟啉单胞菌LPS的四酰化脂质A已通过使用关键的二糖中间体合成,该中间体功能化带有乙酰丙酸酯(Lev)、烯丙氧基碳酸酯(Alloc)和异头二甲基苯基硅烷(TDS)作为正交保护基团,以及9-芴甲氧基羰酰胺(Fmoc)和叠氮基作为氨基保护基团。此外,已采用高效的交叉复分解反应制备了牙龈卟啉单胞菌脂质A中不寻常的分支R-(3)-羟基-13-甲基十四烷酸和(R)-3-十六烷酰氧基-15-甲基十六烷酸。生物学研究显示,合成脂质A不能激活人体和小鼠的TLR2和TLR4以产生细胞因子。然而,研究发现这些化合物是肠道LPS诱导的人单核细胞分泌细胞因子的强效拮抗剂。