The novel glycosphingolipid, b-D-GalNAcp(1®4)[a-D-Fucp(1®3)]-b-D-GlcNAcp(1®)Cer (A), isolated from the marine sponge Aplysinella rhax has a unique structure, with D-fucose and N-acetyl-D-galactosamine moieties attached to a reducing-end N-acetyl-D-glucosamine through an a1®3 and b1®4 linkage, respectively. We synthesized glycolipid 1 and some non-natural di- and trisaccharide analogues 2-6 containing a D-fucose residue. Among these compounds, the natural type showed the most potent nitric oxide (NO) production inhibitory activity against LPS-induced J774.1 cells. Our results indicate that both the presence of a D-Fuca1-3GlcNAc-linkage and the ceramide aglycon portion are crucial for optimal NO inhibition.
从海洋海绵 Aplysinella rhax 中分离出的新型糖
磷脂--b-D-GalNAcp(1®4)[a-D-Fucp(1®3)]-b-D-GlcNAcp(1®)Cer (A) 具有独特的结构,
D-岩藻糖和 N-乙酰基-
D-半乳糖胺分别通过 a1®3 和 b1®4 连接到还原端的 N-乙酰基-
D-葡萄糖胺上。我们合成了
糖脂 1 和一些含有
D-岩藻糖残基的非天然二糖和三
糖类似物 2-6。在这些化合物中,天然型
糖脂对 LPS 诱导的 J774.1 细胞
一氧化氮(NO)产生的抑制活性最强。我们的研究结果表明,D-Fuca1-3GlcNAc 连接和神经酰胺苷元部分的存在对于达到最佳的
一氧化氮抑制效果至关重要。