Lipopolysaccharide (LPS) antagonists have attracted considerable interest as promising candidates for the treatment of severe sepsis triggered by Gram-negative bacteria. In this article, we describe the development of a novel LPS antagonist based on chemical hybridization of vizantin and the hydrophobic molecular unit of LPS (lipid A). Vizantin, 6,6′-bis-O-(3-nonyldodecanoyl)-α,α′-trehalose, was designed as an immunostimulator from a structure–activity relationship (SAR) study with trehalose 6,6′-dicorynomycolate (TDCM). Our recent study indicated that vizantin displays adjuvant activity by specifically binding to the Toll-like receptor 4 (TLR4)/MD2 protein complex. Because lipid A unit (or LPS) is also known to trigger an inflammatory response via the same TLR4/MD2 complex as vizantin, we designed a hybrid compound of vizantin and lipid A with the aim of developing a novel biofunctional glycolipid. Focusing on the antagonism to Escherichia coli LPS in an in vitro model with human macrophages (THP-1 cells), we identified a potent LPS antagonist among the synthesized hybrid compounds. The novel LPS antagonist effectively inhibited LPS-induced release of tumor necrosis factor-alpha (TNF-α) in a dose-dependent manner with an IC50 value of 3.8 nM, making it a candidate for the treatment drug of Gram-negative sepsis and/or septic shock.
脂
多糖(LPS)拮抗剂作为治疗由革兰氏阴性细菌引发的严重败血症的候选药物,引起了人们的极大兴趣。在这篇文章中,我们介绍了一种新型 LPS 拮抗剂的开发情况,它基于 vizantin 与 LPS 的疏
水分子单元(脂质 A)的
化学杂交。Vizantin(6,6′-双-O-(3-壬基十二碳酰基)-α,α′-曲哈洛糖)是通过与 6,6′-二
硼酸曲哈洛糖(TDCM)的结构-活性关系(
SAR)研究而设计的一种免疫刺激剂。我们最近的研究表明,vizantin 通过与 Toll 样受体 4(TLR4)/MD2 蛋白复合物特异性结合而显示出佐剂活性。众所周知,脂质 A 单位(或 LPS)也能通过与 vizantin 相同的 TLR4/MD2 复合物触发炎症反应,因此我们设计了一种 vizantin 和脂质 A 的混合化合物,旨在开发一种新型
生物功能
糖脂。在以人巨噬细胞(THP-1 细胞)为对象的体外模型中,我们重点研究了大肠杆菌 LPS 的拮抗作用,并在合成的混合化合物中发现了一种强效的 LPS 拮抗剂。这种新型 LPS 拮抗剂能以剂量依赖的方式有效抑制 LPS 诱导的肿瘤坏死因子-α(TNF-α)的释放,其 IC50 值为 3.8 nM,因此可作为革兰氏阴性败血症和/或脓毒性休克的候选治疗药物。